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authorDenys Vlasenko2010-09-05 14:50:59 +0200
committerDenys Vlasenko2010-09-05 14:50:59 +0200
commitb36abf2dfcb47cc0ca659c916b3efef9f757ea0c (patch)
treeb6df2d914b46ce369c600c317e9e792f9930b80d
parent38292b68c962b9d470fa4e577020749c8c69226d (diff)
downloadbusybox-b36abf2dfcb47cc0ca659c916b3efef9f757ea0c.zip
busybox-b36abf2dfcb47cc0ca659c916b3efef9f757ea0c.tar.gz
hush: big reordering: move parser functions to the beginning. no code changes
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
-rw-r--r--shell/hush.c4084
1 files changed, 2042 insertions, 2042 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 1bed721..2afe12f 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -2515,20 +2515,1864 @@ static char **o_finalize_list(o_string *o, int n)
return list;
}
+static void free_pipe_list(struct pipe *head);
-/* Expansion can recurse */
-#if ENABLE_HUSH_TICK
-static int process_command_subs(o_string *dest, const char *s);
+/* Return code is the exit status of the pipe */
+static void free_pipe(struct pipe *pi)
+{
+ char **p;
+ struct command *command;
+ struct redir_struct *r, *rnext;
+ int a, i;
+
+ if (pi->stopped_cmds > 0) /* why? */
+ return;
+ debug_printf_clean("run pipe: (pid %d)\n", getpid());
+ for (i = 0; i < pi->num_cmds; i++) {
+ command = &pi->cmds[i];
+ debug_printf_clean(" command %d:\n", i);
+ if (command->argv) {
+ for (a = 0, p = command->argv; *p; a++, p++) {
+ debug_printf_clean(" argv[%d] = %s\n", a, *p);
+ }
+ free_strings(command->argv);
+ command->argv = NULL;
+ }
+ /* not "else if": on syntax error, we may have both! */
+ if (command->group) {
+ debug_printf_clean(" begin group (cmd_type:%d)\n",
+ command->cmd_type);
+ free_pipe_list(command->group);
+ debug_printf_clean(" end group\n");
+ command->group = NULL;
+ }
+ /* else is crucial here.
+ * If group != NULL, child_func is meaningless */
+#if ENABLE_HUSH_FUNCTIONS
+ else if (command->child_func) {
+ debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
+ command->child_func->parent_cmd = NULL;
+ }
#endif
-static char *expand_string_to_string(const char *str);
+#if !BB_MMU
+ free(command->group_as_string);
+ command->group_as_string = NULL;
+#endif
+ for (r = command->redirects; r; r = rnext) {
+ debug_printf_clean(" redirect %d%s",
+ r->rd_fd, redir_table[r->rd_type].descrip);
+ /* guard against the case >$FOO, where foo is unset or blank */
+ if (r->rd_filename) {
+ debug_printf_clean(" fname:'%s'\n", r->rd_filename);
+ free(r->rd_filename);
+ r->rd_filename = NULL;
+ }
+ debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
+ rnext = r->next;
+ free(r);
+ }
+ command->redirects = NULL;
+ }
+ free(pi->cmds); /* children are an array, they get freed all at once */
+ pi->cmds = NULL;
+#if ENABLE_HUSH_JOB
+ free(pi->cmdtext);
+ pi->cmdtext = NULL;
+#endif
+}
+
+static void free_pipe_list(struct pipe *head)
+{
+ struct pipe *pi, *next;
+
+ for (pi = head; pi; pi = next) {
+#if HAS_KEYWORDS
+ debug_printf_clean(" pipe reserved word %d\n", pi->res_word);
+#endif
+ free_pipe(pi);
+ debug_printf_clean("pipe followup code %d\n", pi->followup);
+ next = pi->next;
+ /*pi->next = NULL;*/
+ free(pi);
+ }
+}
+
+
+/*** Parsing routines ***/
+
+static struct pipe *new_pipe(void)
+{
+ struct pipe *pi;
+ pi = xzalloc(sizeof(struct pipe));
+ /*pi->followup = 0; - deliberately invalid value */
+ /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
+ return pi;
+}
+
+/* Command (member of a pipe) is complete, or we start a new pipe
+ * if ctx->command is NULL.
+ * No errors possible here.
+ */
+static int done_command(struct parse_context *ctx)
+{
+ /* The command is really already in the pipe structure, so
+ * advance the pipe counter and make a new, null command. */
+ struct pipe *pi = ctx->pipe;
+ struct command *command = ctx->command;
+
+ if (command) {
+ if (IS_NULL_CMD(command)) {
+ debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
+ goto clear_and_ret;
+ }
+ pi->num_cmds++;
+ debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
+ //debug_print_tree(ctx->list_head, 20);
+ } else {
+ debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
+ }
+
+ /* Only real trickiness here is that the uncommitted
+ * command structure is not counted in pi->num_cmds. */
+ pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
+ ctx->command = command = &pi->cmds[pi->num_cmds];
+ clear_and_ret:
+ memset(command, 0, sizeof(*command));
+ return pi->num_cmds; /* used only for 0/nonzero check */
+}
+
+static void done_pipe(struct parse_context *ctx, pipe_style type)
+{
+ int not_null;
+
+ debug_printf_parse("done_pipe entered, followup %d\n", type);
+ /* Close previous command */
+ not_null = done_command(ctx);
+ ctx->pipe->followup = type;
+#if HAS_KEYWORDS
+ ctx->pipe->pi_inverted = ctx->ctx_inverted;
+ ctx->ctx_inverted = 0;
+ ctx->pipe->res_word = ctx->ctx_res_w;
+#endif
+
+ /* Without this check, even just <enter> on command line generates
+ * tree of three NOPs (!). Which is harmless but annoying.
+ * IOW: it is safe to do it unconditionally. */
+ if (not_null
+#if ENABLE_HUSH_IF
+ || ctx->ctx_res_w == RES_FI
+#endif
+#if ENABLE_HUSH_LOOPS
+ || ctx->ctx_res_w == RES_DONE
+ || ctx->ctx_res_w == RES_FOR
+ || ctx->ctx_res_w == RES_IN
+#endif
+#if ENABLE_HUSH_CASE
+ || ctx->ctx_res_w == RES_ESAC
+#endif
+ ) {
+ struct pipe *new_p;
+ debug_printf_parse("done_pipe: adding new pipe: "
+ "not_null:%d ctx->ctx_res_w:%d\n",
+ not_null, ctx->ctx_res_w);
+ new_p = new_pipe();
+ ctx->pipe->next = new_p;
+ ctx->pipe = new_p;
+ /* RES_THEN, RES_DO etc are "sticky" -
+ * they remain set for pipes inside if/while.
+ * This is used to control execution.
+ * RES_FOR and RES_IN are NOT sticky (needed to support
+ * cases where variable or value happens to match a keyword):
+ */
+#if ENABLE_HUSH_LOOPS
+ if (ctx->ctx_res_w == RES_FOR
+ || ctx->ctx_res_w == RES_IN)
+ ctx->ctx_res_w = RES_NONE;
+#endif
+#if ENABLE_HUSH_CASE
+ if (ctx->ctx_res_w == RES_MATCH)
+ ctx->ctx_res_w = RES_CASE_BODY;
+ if (ctx->ctx_res_w == RES_CASE)
+ ctx->ctx_res_w = RES_CASE_IN;
+#endif
+ ctx->command = NULL; /* trick done_command below */
+ /* Create the memory for command, roughly:
+ * ctx->pipe->cmds = new struct command;
+ * ctx->command = &ctx->pipe->cmds[0];
+ */
+ done_command(ctx);
+ //debug_print_tree(ctx->list_head, 10);
+ }
+ debug_printf_parse("done_pipe return\n");
+}
+
+static void initialize_context(struct parse_context *ctx)
+{
+ memset(ctx, 0, sizeof(*ctx));
+ ctx->pipe = ctx->list_head = new_pipe();
+ /* Create the memory for command, roughly:
+ * ctx->pipe->cmds = new struct command;
+ * ctx->command = &ctx->pipe->cmds[0];
+ */
+ done_command(ctx);
+}
+
+/* If a reserved word is found and processed, parse context is modified
+ * and 1 is returned.
+ */
+#if HAS_KEYWORDS
+struct reserved_combo {
+ char literal[6];
+ unsigned char res;
+ unsigned char assignment_flag;
+ int flag;
+};
+enum {
+ FLAG_END = (1 << RES_NONE ),
+# if ENABLE_HUSH_IF
+ FLAG_IF = (1 << RES_IF ),
+ FLAG_THEN = (1 << RES_THEN ),
+ FLAG_ELIF = (1 << RES_ELIF ),
+ FLAG_ELSE = (1 << RES_ELSE ),
+ FLAG_FI = (1 << RES_FI ),
+# endif
+# if ENABLE_HUSH_LOOPS
+ FLAG_FOR = (1 << RES_FOR ),
+ FLAG_WHILE = (1 << RES_WHILE),
+ FLAG_UNTIL = (1 << RES_UNTIL),
+ FLAG_DO = (1 << RES_DO ),
+ FLAG_DONE = (1 << RES_DONE ),
+ FLAG_IN = (1 << RES_IN ),
+# endif
+# if ENABLE_HUSH_CASE
+ FLAG_MATCH = (1 << RES_MATCH),
+ FLAG_ESAC = (1 << RES_ESAC ),
+# endif
+ FLAG_START = (1 << RES_XXXX ),
+};
+
+static const struct reserved_combo* match_reserved_word(o_string *word)
+{
+ /* Mostly a list of accepted follow-up reserved words.
+ * FLAG_END means we are done with the sequence, and are ready
+ * to turn the compound list into a command.
+ * FLAG_START means the word must start a new compound list.
+ */
+ static const struct reserved_combo reserved_list[] = {
+# if ENABLE_HUSH_IF
+ { "!", RES_NONE, NOT_ASSIGNMENT , 0 },
+ { "if", RES_IF, WORD_IS_KEYWORD, FLAG_THEN | FLAG_START },
+ { "then", RES_THEN, WORD_IS_KEYWORD, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
+ { "elif", RES_ELIF, WORD_IS_KEYWORD, FLAG_THEN },
+ { "else", RES_ELSE, WORD_IS_KEYWORD, FLAG_FI },
+ { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
+# endif
+# if ENABLE_HUSH_LOOPS
+ { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
+ { "while", RES_WHILE, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
+ { "until", RES_UNTIL, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
+ { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
+ { "do", RES_DO, WORD_IS_KEYWORD, FLAG_DONE },
+ { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
+# endif
+# if ENABLE_HUSH_CASE
+ { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
+ { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
+# endif
+ };
+ const struct reserved_combo *r;
+
+ for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
+ if (strcmp(word->data, r->literal) == 0)
+ return r;
+ }
+ return NULL;
+}
+/* Return 0: not a keyword, 1: keyword
+ */
+static int reserved_word(o_string *word, struct parse_context *ctx)
+{
+# if ENABLE_HUSH_CASE
+ static const struct reserved_combo reserved_match = {
+ "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
+ };
+# endif
+ const struct reserved_combo *r;
+
+ if (word->has_quoted_part)
+ return 0;
+ r = match_reserved_word(word);
+ if (!r)
+ return 0;
+
+ debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
+# if ENABLE_HUSH_CASE
+ if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
+ /* "case word IN ..." - IN part starts first MATCH part */
+ r = &reserved_match;
+ } else
+# endif
+ if (r->flag == 0) { /* '!' */
+ if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
+ syntax_error("! ! command");
+ ctx->ctx_res_w = RES_SNTX;
+ }
+ ctx->ctx_inverted = 1;
+ return 1;
+ }
+ if (r->flag & FLAG_START) {
+ struct parse_context *old;
+
+ old = xmalloc(sizeof(*old));
+ debug_printf_parse("push stack %p\n", old);
+ *old = *ctx; /* physical copy */
+ initialize_context(ctx);
+ ctx->stack = old;
+ } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
+ syntax_error_at(word->data);
+ ctx->ctx_res_w = RES_SNTX;
+ return 1;
+ } else {
+ /* "{...} fi" is ok. "{...} if" is not
+ * Example:
+ * if { echo foo; } then { echo bar; } fi */
+ if (ctx->command->group)
+ done_pipe(ctx, PIPE_SEQ);
+ }
+
+ ctx->ctx_res_w = r->res;
+ ctx->old_flag = r->flag;
+ word->o_assignment = r->assignment_flag;
+
+ if (ctx->old_flag & FLAG_END) {
+ struct parse_context *old;
+
+ done_pipe(ctx, PIPE_SEQ);
+ debug_printf_parse("pop stack %p\n", ctx->stack);
+ old = ctx->stack;
+ old->command->group = ctx->list_head;
+ old->command->cmd_type = CMD_NORMAL;
+# if !BB_MMU
+ o_addstr(&old->as_string, ctx->as_string.data);
+ o_free_unsafe(&ctx->as_string);
+ old->command->group_as_string = xstrdup(old->as_string.data);
+ debug_printf_parse("pop, remembering as:'%s'\n",
+ old->command->group_as_string);
+# endif
+ *ctx = *old; /* physical copy */
+ free(old);
+ }
+ return 1;
+}
+#endif /* HAS_KEYWORDS */
+
+/* Word is complete, look at it and update parsing context.
+ * Normal return is 0. Syntax errors return 1.
+ * Note: on return, word is reset, but not o_free'd!
+ */
+static int done_word(o_string *word, struct parse_context *ctx)
+{
+ struct command *command = ctx->command;
+
+ debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
+ if (word->length == 0 && !word->has_quoted_part) {
+ debug_printf_parse("done_word return 0: true null, ignored\n");
+ return 0;
+ }
+
+ if (ctx->pending_redirect) {
+ /* We do not glob in e.g. >*.tmp case. bash seems to glob here
+ * only if run as "bash", not "sh" */
+ /* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
+ * "2.7 Redirection
+ * ...the word that follows the redirection operator
+ * shall be subjected to tilde expansion, parameter expansion,
+ * command substitution, arithmetic expansion, and quote
+ * removal. Pathname expansion shall not be performed
+ * on the word by a non-interactive shell; an interactive
+ * shell may perform it, but shall do so only when
+ * the expansion would result in one word."
+ */
+ ctx->pending_redirect->rd_filename = xstrdup(word->data);
+ /* Cater for >\file case:
+ * >\a creates file a; >\\a, >"\a", >"\\a" create file \a
+ * Same with heredocs:
+ * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
+ */
+ if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
+ unbackslash(ctx->pending_redirect->rd_filename);
+ /* Is it <<"HEREDOC"? */
+ if (word->has_quoted_part) {
+ ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
+ }
+ }
+ debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
+ ctx->pending_redirect = NULL;
+ } else {
+ /* If this word wasn't an assignment, next ones definitely
+ * can't be assignments. Even if they look like ones. */
+ if (word->o_assignment != DEFINITELY_ASSIGNMENT
+ && word->o_assignment != WORD_IS_KEYWORD
+ ) {
+ word->o_assignment = NOT_ASSIGNMENT;
+ } else {
+ if (word->o_assignment == DEFINITELY_ASSIGNMENT)
+ command->assignment_cnt++;
+ word->o_assignment = MAYBE_ASSIGNMENT;
+ }
+
+#if HAS_KEYWORDS
+# if ENABLE_HUSH_CASE
+ if (ctx->ctx_dsemicolon
+ && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
+ ) {
+ /* already done when ctx_dsemicolon was set to 1: */
+ /* ctx->ctx_res_w = RES_MATCH; */
+ ctx->ctx_dsemicolon = 0;
+ } else
+# endif
+ if (!command->argv /* if it's the first word... */
+# if ENABLE_HUSH_LOOPS
+ && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
+ && ctx->ctx_res_w != RES_IN
+# endif
+# if ENABLE_HUSH_CASE
+ && ctx->ctx_res_w != RES_CASE
+# endif
+ ) {
+ debug_printf_parse("checking '%s' for reserved-ness\n", word->data);
+ if (reserved_word(word, ctx)) {
+ o_reset_to_empty_unquoted(word);
+ debug_printf_parse("done_word return %d\n",
+ (ctx->ctx_res_w == RES_SNTX));
+ return (ctx->ctx_res_w == RES_SNTX);
+ }
+# ifdef CMD_SINGLEWORD_NOGLOB_COND
+ if (strcmp(word->data, "export") == 0
+# if ENABLE_HUSH_LOCAL
+ || strcmp(word->data, "local") == 0
+# endif
+ ) {
+ command->cmd_type = CMD_SINGLEWORD_NOGLOB_COND;
+ } else
+# endif
+# if ENABLE_HUSH_BASH_COMPAT
+ if (strcmp(word->data, "[[") == 0) {
+ command->cmd_type = CMD_SINGLEWORD_NOGLOB;
+ }
+ /* fall through */
+# endif
+ }
+#endif
+ if (command->group) {
+ /* "{ echo foo; } echo bar" - bad */
+ syntax_error_at(word->data);
+ debug_printf_parse("done_word return 1: syntax error, "
+ "groups and arglists don't mix\n");
+ return 1;
+ }
+ if (word->has_quoted_part
+ /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
+ && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
+ /* (otherwise it's known to be not empty and is already safe) */
+ ) {
+ /* exclude "$@" - it can expand to no word despite "" */
+ char *p = word->data;
+ while (p[0] == SPECIAL_VAR_SYMBOL
+ && (p[1] & 0x7f) == '@'
+ && p[2] == SPECIAL_VAR_SYMBOL
+ ) {
+ p += 3;
+ }
+ if (p == word->data || p[0] != '\0') {
+ /* saw no "$@", or not only "$@" but some
+ * real text is there too */
+ /* insert "empty variable" reference, this makes
+ * e.g. "", $empty"" etc to not disappear */
+ o_addchr(word, SPECIAL_VAR_SYMBOL);
+ o_addchr(word, SPECIAL_VAR_SYMBOL);
+ }
+ }
+ command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
+ debug_print_strings("word appended to argv", command->argv);
+ }
+
+#if ENABLE_HUSH_LOOPS
+ if (ctx->ctx_res_w == RES_FOR) {
+ if (word->has_quoted_part
+ || !is_well_formed_var_name(command->argv[0], '\0')
+ ) {
+ /* bash says just "not a valid identifier" */
+ syntax_error("not a valid identifier in for");
+ return 1;
+ }
+ /* Force FOR to have just one word (variable name) */
+ /* NB: basically, this makes hush see "for v in ..."
+ * syntax as if it is "for v; in ...". FOR and IN become
+ * two pipe structs in parse tree. */
+ done_pipe(ctx, PIPE_SEQ);
+ }
+#endif
+#if ENABLE_HUSH_CASE
+ /* Force CASE to have just one word */
+ if (ctx->ctx_res_w == RES_CASE) {
+ done_pipe(ctx, PIPE_SEQ);
+ }
+#endif
+
+ o_reset_to_empty_unquoted(word);
+
+ debug_printf_parse("done_word return 0\n");
+ return 0;
+}
+
+
+/* Peek ahead in the input to find out if we have a "&n" construct,
+ * as in "2>&1", that represents duplicating a file descriptor.
+ * Return:
+ * REDIRFD_CLOSE if >&- "close fd" construct is seen,
+ * REDIRFD_SYNTAX_ERR if syntax error,
+ * REDIRFD_TO_FILE if no & was seen,
+ * or the number found.
+ */
+#if BB_MMU
+#define parse_redir_right_fd(as_string, input) \
+ parse_redir_right_fd(input)
+#endif
+static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
+{
+ int ch, d, ok;
+
+ ch = i_peek(input);
+ if (ch != '&')
+ return REDIRFD_TO_FILE;
+
+ ch = i_getch(input); /* get the & */
+ nommu_addchr(as_string, ch);
+ ch = i_peek(input);
+ if (ch == '-') {
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ return REDIRFD_CLOSE;
+ }
+ d = 0;
+ ok = 0;
+ while (ch != EOF && isdigit(ch)) {
+ d = d*10 + (ch-'0');
+ ok = 1;
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ ch = i_peek(input);
+ }
+ if (ok) return d;
+
+//TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
+
+ bb_error_msg("ambiguous redirect");
+ return REDIRFD_SYNTAX_ERR;
+}
+
+/* Return code is 0 normal, 1 if a syntax error is detected
+ */
+static int parse_redirect(struct parse_context *ctx,
+ int fd,
+ redir_type style,
+ struct in_str *input)
+{
+ struct command *command = ctx->command;
+ struct redir_struct *redir;
+ struct redir_struct **redirp;
+ int dup_num;
+
+ dup_num = REDIRFD_TO_FILE;
+ if (style != REDIRECT_HEREDOC) {
+ /* Check for a '>&1' type redirect */
+ dup_num = parse_redir_right_fd(&ctx->as_string, input);
+ if (dup_num == REDIRFD_SYNTAX_ERR)
+ return 1;
+ } else {
+ int ch = i_peek(input);
+ dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
+ if (dup_num) { /* <<-... */
+ ch = i_getch(input);
+ nommu_addchr(&ctx->as_string, ch);
+ ch = i_peek(input);
+ }
+ }
+
+ if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
+ int ch = i_peek(input);
+ if (ch == '|') {
+ /* >|FILE redirect ("clobbering" >).
+ * Since we do not support "set -o noclobber" yet,
+ * >| and > are the same for now. Just eat |.
+ */
+ ch = i_getch(input);
+ nommu_addchr(&ctx->as_string, ch);
+ }
+ }
+
+ /* Create a new redir_struct and append it to the linked list */
+ redirp = &command->redirects;
+ while ((redir = *redirp) != NULL) {
+ redirp = &(redir->next);
+ }
+ *redirp = redir = xzalloc(sizeof(*redir));
+ /* redir->next = NULL; */
+ /* redir->rd_filename = NULL; */
+ redir->rd_type = style;
+ redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
+
+ debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
+ redir_table[style].descrip);
+
+ redir->rd_dup = dup_num;
+ if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
+ /* Erik had a check here that the file descriptor in question
+ * is legit; I postpone that to "run time"
+ * A "-" representation of "close me" shows up as a -3 here */
+ debug_printf_parse("duplicating redirect '%d>&%d'\n",
+ redir->rd_fd, redir->rd_dup);
+ } else {
+ /* Set ctx->pending_redirect, so we know what to do at the
+ * end of the next parsed word. */
+ ctx->pending_redirect = redir;
+ }
+ return 0;
+}
+
+/* If a redirect is immediately preceded by a number, that number is
+ * supposed to tell which file descriptor to redirect. This routine
+ * looks for such preceding numbers. In an ideal world this routine
+ * needs to handle all the following classes of redirects...
+ * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
+ * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
+ * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
+ * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
+ *
+ * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
+ * "2.7 Redirection
+ * ... If n is quoted, the number shall not be recognized as part of
+ * the redirection expression. For example:
+ * echo \2>a
+ * writes the character 2 into file a"
+ * We are getting it right by setting ->has_quoted_part on any \<char>
+ *
+ * A -1 return means no valid number was found,
+ * the caller should use the appropriate default for this redirection.
+ */
+static int redirect_opt_num(o_string *o)
+{
+ int num;
+
+ if (o->data == NULL)
+ return -1;
+ num = bb_strtou(o->data, NULL, 10);
+ if (errno || num < 0)
+ return -1;
+ o_reset_to_empty_unquoted(o);
+ return num;
+}
+
+#if BB_MMU
+#define fetch_till_str(as_string, input, word, skip_tabs) \
+ fetch_till_str(input, word, skip_tabs)
+#endif
+static char *fetch_till_str(o_string *as_string,
+ struct in_str *input,
+ const char *word,
+ int skip_tabs)
+{
+ o_string heredoc = NULL_O_STRING;
+ int past_EOL = 0;
+ int ch;
+
+ goto jump_in;
+ while (1) {
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ if (ch == '\n') {
+ if (strcmp(heredoc.data + past_EOL, word) == 0) {
+ heredoc.data[past_EOL] = '\0';
+ debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
+ return heredoc.data;
+ }
+ do {
+ o_addchr(&heredoc, ch);
+ past_EOL = heredoc.length;
+ jump_in:
+ do {
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ } while (skip_tabs && ch == '\t');
+ } while (ch == '\n');
+ }
+ if (ch == EOF) {
+ o_free_unsafe(&heredoc);
+ return NULL;
+ }
+ o_addchr(&heredoc, ch);
+ nommu_addchr(as_string, ch);
+ }
+}
+
+/* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
+ * and load them all. There should be exactly heredoc_cnt of them.
+ */
+static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
+{
+ struct pipe *pi = ctx->list_head;
+
+ while (pi && heredoc_cnt) {
+ int i;
+ struct command *cmd = pi->cmds;
+
+ debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
+ pi->num_cmds,
+ cmd->argv ? cmd->argv[0] : "NONE");
+ for (i = 0; i < pi->num_cmds; i++) {
+ struct redir_struct *redir = cmd->redirects;
+
+ debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
+ i, cmd->argv ? cmd->argv[0] : "NONE");
+ while (redir) {
+ if (redir->rd_type == REDIRECT_HEREDOC) {
+ char *p;
+
+ redir->rd_type = REDIRECT_HEREDOC2;
+ /* redir->rd_dup is (ab)used to indicate <<- */
+ p = fetch_till_str(&ctx->as_string, input,
+ redir->rd_filename, redir->rd_dup & HEREDOC_SKIPTABS);
+ if (!p) {
+ syntax_error("unexpected EOF in here document");
+ return 1;
+ }
+ free(redir->rd_filename);
+ redir->rd_filename = p;
+ heredoc_cnt--;
+ }
+ redir = redir->next;
+ }
+ cmd++;
+ }
+ pi = pi->next;
+ }
+#if 0
+ /* Should be 0. If it isn't, it's a parse error */
+ if (heredoc_cnt)
+ bb_error_msg_and_die("heredoc BUG 2");
+#endif
+ return 0;
+}
+
+
+static int run_list(struct pipe *pi);
+#if BB_MMU
+#define parse_stream(pstring, input, end_trigger) \
+ parse_stream(input, end_trigger)
+#endif
+static struct pipe *parse_stream(char **pstring,
+ struct in_str *input,
+ int end_trigger);
+
+
+#if !ENABLE_HUSH_FUNCTIONS
+#define parse_group(dest, ctx, input, ch) \
+ parse_group(ctx, input, ch)
+#endif
+static int parse_group(o_string *dest, struct parse_context *ctx,
+ struct in_str *input, int ch)
+{
+ /* dest contains characters seen prior to ( or {.
+ * Typically it's empty, but for function defs,
+ * it contains function name (without '()'). */
+ struct pipe *pipe_list;
+ int endch;
+ struct command *command = ctx->command;
+
+ debug_printf_parse("parse_group entered\n");
+#if ENABLE_HUSH_FUNCTIONS
+ if (ch == '(' && !dest->has_quoted_part) {
+ if (dest->length)
+ if (done_word(dest, ctx))
+ return 1;
+ if (!command->argv)
+ goto skip; /* (... */
+ if (command->argv[1]) { /* word word ... (... */
+ syntax_error_unexpected_ch('(');
+ return 1;
+ }
+ /* it is "word(..." or "word (..." */
+ do
+ ch = i_getch(input);
+ while (ch == ' ' || ch == '\t');
+ if (ch != ')') {
+ syntax_error_unexpected_ch(ch);
+ return 1;
+ }
+ nommu_addchr(&ctx->as_string, ch);
+ do
+ ch = i_getch(input);
+ while (ch == ' ' || ch == '\t' || ch == '\n');
+ if (ch != '{') {
+ syntax_error_unexpected_ch(ch);
+ return 1;
+ }
+ nommu_addchr(&ctx->as_string, ch);
+ command->cmd_type = CMD_FUNCDEF;
+ goto skip;
+ }
+#endif
+
+#if 0 /* Prevented by caller */
+ if (command->argv /* word [word]{... */
+ || dest->length /* word{... */
+ || dest->has_quoted_part /* ""{... */
+ ) {
+ syntax_error(NULL);
+ debug_printf_parse("parse_group return 1: "
+ "syntax error, groups and arglists don't mix\n");
+ return 1;
+ }
+#endif
+
+#if ENABLE_HUSH_FUNCTIONS
+ skip:
+#endif
+ endch = '}';
+ if (ch == '(') {
+ endch = ')';
+ command->cmd_type = CMD_SUBSHELL;
+ } else {
+ /* bash does not allow "{echo...", requires whitespace */
+ ch = i_getch(input);
+ if (ch != ' ' && ch != '\t' && ch != '\n') {
+ syntax_error_unexpected_ch(ch);
+ return 1;
+ }
+ nommu_addchr(&ctx->as_string, ch);
+ }
+
+ {
+#if BB_MMU
+# define as_string NULL
+#else
+ char *as_string = NULL;
+#endif
+ pipe_list = parse_stream(&as_string, input, endch);
+#if !BB_MMU
+ if (as_string)
+ o_addstr(&ctx->as_string, as_string);
+#endif
+ /* empty ()/{} or parse error? */
+ if (!pipe_list || pipe_list == ERR_PTR) {
+ /* parse_stream already emitted error msg */
+ if (!BB_MMU)
+ free(as_string);
+ debug_printf_parse("parse_group return 1: "
+ "parse_stream returned %p\n", pipe_list);
+ return 1;
+ }
+ command->group = pipe_list;
+#if !BB_MMU
+ as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
+ command->group_as_string = as_string;
+ debug_printf_parse("end of group, remembering as:'%s'\n",
+ command->group_as_string);
+#endif
+#undef as_string
+ }
+ debug_printf_parse("parse_group return 0\n");
+ return 0;
+ /* command remains "open", available for possible redirects */
+}
+
+#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
+/* Subroutines for copying $(...) and `...` things */
+static void add_till_backquote(o_string *dest, struct in_str *input);
+/* '...' */
+static void add_till_single_quote(o_string *dest, struct in_str *input)
+{
+ while (1) {
+ int ch = i_getch(input);
+ if (ch == EOF) {
+ syntax_error_unterm_ch('\'');
+ /*xfunc_die(); - redundant */
+ }
+ if (ch == '\'')
+ return;
+ o_addchr(dest, ch);
+ }
+}
+/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
+static void add_till_double_quote(o_string *dest, struct in_str *input)
+{
+ while (1) {
+ int ch = i_getch(input);
+ if (ch == EOF) {
+ syntax_error_unterm_ch('"');
+ /*xfunc_die(); - redundant */
+ }
+ if (ch == '"')
+ return;
+ if (ch == '\\') { /* \x. Copy both chars. */
+ o_addchr(dest, ch);
+ ch = i_getch(input);
+ }
+ o_addchr(dest, ch);
+ if (ch == '`') {
+ add_till_backquote(dest, input);
+ o_addchr(dest, ch);
+ continue;
+ }
+ //if (ch == '$') ...
+ }
+}
+/* Process `cmd` - copy contents until "`" is seen. Complicated by
+ * \` quoting.
+ * "Within the backquoted style of command substitution, backslash
+ * shall retain its literal meaning, except when followed by: '$', '`', or '\'.
+ * The search for the matching backquote shall be satisfied by the first
+ * backquote found without a preceding backslash; during this search,
+ * if a non-escaped backquote is encountered within a shell comment,
+ * a here-document, an embedded command substitution of the $(command)
+ * form, or a quoted string, undefined results occur. A single-quoted
+ * or double-quoted string that begins, but does not end, within the
+ * "`...`" sequence produces undefined results."
+ * Example Output
+ * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
+ */
+static void add_till_backquote(o_string *dest, struct in_str *input)
+{
+ while (1) {
+ int ch = i_getch(input);
+ if (ch == EOF) {
+ syntax_error_unterm_ch('`');
+ /*xfunc_die(); - redundant */
+ }
+ if (ch == '`')
+ return;
+ if (ch == '\\') {
+ /* \x. Copy both chars unless it is \` */
+ int ch2 = i_getch(input);
+ if (ch2 == EOF) {
+ syntax_error_unterm_ch('`');
+ /*xfunc_die(); - redundant */
+ }
+ if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
+ o_addchr(dest, ch);
+ ch = ch2;
+ }
+ o_addchr(dest, ch);
+ }
+}
+/* Process $(cmd) - copy contents until ")" is seen. Complicated by
+ * quoting and nested ()s.
+ * "With the $(command) style of command substitution, all characters
+ * following the open parenthesis to the matching closing parenthesis
+ * constitute the command. Any valid shell script can be used for command,
+ * except a script consisting solely of redirections which produces
+ * unspecified results."
+ * Example Output
+ * echo $(echo '(TEST)' BEST) (TEST) BEST
+ * echo $(echo 'TEST)' BEST) TEST) BEST
+ * echo $(echo \(\(TEST\) BEST) ((TEST) BEST
+ *
+ * Also adapted to eat ${var%...} and $((...)) constructs, since ... part
+ * can contain arbitrary constructs, just like $(cmd).
+ * In bash compat mode, it needs to also be able to stop on ':' or '/'
+ * for ${var:N[:M]} and ${var/P[/R]} parsing.
+ */
+#define DOUBLE_CLOSE_CHAR_FLAG 0x80
+static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch)
+{
+ int ch;
+ char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG;
+# if ENABLE_HUSH_BASH_COMPAT
+ char end_char2 = end_ch >> 8;
+# endif
+ end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1);
+
+ while (1) {
+ ch = i_getch(input);
+ if (ch == EOF) {
+ syntax_error_unterm_ch(end_ch);
+ /*xfunc_die(); - redundant */
+ }
+ if (ch == end_ch IF_HUSH_BASH_COMPAT( || ch == end_char2)) {
+ if (!dbl)
+ break;
+ /* we look for closing )) of $((EXPR)) */
+ if (i_peek(input) == end_ch) {
+ i_getch(input); /* eat second ')' */
+ break;
+ }
+ }
+ o_addchr(dest, ch);
+ if (ch == '(' || ch == '{') {
+ ch = (ch == '(' ? ')' : '}');
+ add_till_closing_bracket(dest, input, ch);
+ o_addchr(dest, ch);
+ continue;
+ }
+ if (ch == '\'') {
+ add_till_single_quote(dest, input);
+ o_addchr(dest, ch);
+ continue;
+ }
+ if (ch == '"') {
+ add_till_double_quote(dest, input);
+ o_addchr(dest, ch);
+ continue;
+ }
+ if (ch == '`') {
+ add_till_backquote(dest, input);
+ o_addchr(dest, ch);
+ continue;
+ }
+ if (ch == '\\') {
+ /* \x. Copy verbatim. Important for \(, \) */
+ ch = i_getch(input);
+ if (ch == EOF) {
+ syntax_error_unterm_ch(')');
+ /*xfunc_die(); - redundant */
+ }
+ o_addchr(dest, ch);
+ continue;
+ }
+ }
+ return ch;
+}
+#endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS */
+
+/* Return code: 0 for OK, 1 for syntax error */
+#if BB_MMU
+#define parse_dollar(as_string, dest, input) \
+ parse_dollar(dest, input)
+#define as_string NULL
+#endif
+static int parse_dollar(o_string *as_string,
+ o_string *dest,
+ struct in_str *input)
+{
+ int ch = i_peek(input); /* first character after the $ */
+ unsigned char quote_mask = dest->o_escape ? 0x80 : 0;
+
+ debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
+ if (isalpha(ch)) {
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ make_var:
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ while (1) {
+ debug_printf_parse(": '%c'\n", ch);
+ o_addchr(dest, ch | quote_mask);
+ quote_mask = 0;
+ ch = i_peek(input);
+ if (!isalnum(ch) && ch != '_')
+ break;
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ }
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ } else if (isdigit(ch)) {
+ make_one_char_var:
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ debug_printf_parse(": '%c'\n", ch);
+ o_addchr(dest, ch | quote_mask);
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ } else switch (ch) {
+ case '$': /* pid */
+ case '!': /* last bg pid */
+ case '?': /* last exit code */
+ case '#': /* number of args */
+ case '*': /* args */
+ case '@': /* args */
+ goto make_one_char_var;
+ case '{': {
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+
+ ch = i_getch(input); /* eat '{' */
+ nommu_addchr(as_string, ch);
+
+ ch = i_getch(input); /* first char after '{' */
+ nommu_addchr(as_string, ch);
+ /* It should be ${?}, or ${#var},
+ * or even ${?+subst} - operator acting on a special variable,
+ * or the beginning of variable name.
+ */
+ if (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) { /* not one of those */
+ bad_dollar_syntax:
+ syntax_error_unterm_str("${name}");
+ debug_printf_parse("parse_dollar return 1: unterminated ${name}\n");
+ return 1;
+ }
+ ch |= quote_mask;
+
+ /* It's possible to just call add_till_closing_bracket() at this point.
+ * However, this regresses some of our testsuite cases
+ * which check invalid constructs like ${%}.
+ * Oh well... let's check that the var name part is fine... */
+
+ while (1) {
+ unsigned pos;
+
+ o_addchr(dest, ch);
+ debug_printf_parse(": '%c'\n", ch);
+
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ if (ch == '}')
+ break;
+
+ if (!isalnum(ch) && ch != '_') {
+ unsigned end_ch;
+ unsigned char last_ch;
+ /* handle parameter expansions
+ * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
+ */
+ if (!strchr(VAR_SUBST_OPS, ch)) /* ${var<bad_char>... */
+ goto bad_dollar_syntax;
+
+ /* Eat everything until closing '}' (or ':') */
+ end_ch = '}';
+ if (ENABLE_HUSH_BASH_COMPAT
+ && ch == ':'
+ && !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input))
+ ) {
+ /* It's ${var:N[:M]} thing */
+ end_ch = '}' * 0x100 + ':';
+ }
+ if (ENABLE_HUSH_BASH_COMPAT
+ && ch == '/'
+ ) {
+ /* It's ${var/[/]pattern[/repl]} thing */
+ if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */
+ i_getch(input);
+ nommu_addchr(as_string, '/');
+ ch = '\\';
+ }
+ end_ch = '}' * 0x100 + '/';
+ }
+ o_addchr(dest, ch);
+ again:
+ if (!BB_MMU)
+ pos = dest->length;
+#if ENABLE_HUSH_DOLLAR_OPS
+ last_ch = add_till_closing_bracket(dest, input, end_ch);
+#else
+#error Simple code to only allow ${var} is not implemented
+#endif
+ if (as_string) {
+ o_addstr(as_string, dest->data + pos);
+ o_addchr(as_string, last_ch);
+ }
+
+ if (ENABLE_HUSH_BASH_COMPAT && (end_ch & 0xff00)) {
+ /* close the first block: */
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ /* while parsing N from ${var:N[:M]}
+ * or pattern from ${var/[/]pattern[/repl]} */
+ if ((end_ch & 0xff) == last_ch) {
+ /* got ':' or '/'- parse the rest */
+ end_ch = '}';
+ goto again;
+ }
+ /* got '}' */
+ if (end_ch == '}' * 0x100 + ':') {
+ /* it's ${var:N} - emulate :999999999 */
+ o_addstr(dest, "999999999");
+ } /* else: it's ${var/[/]pattern} */
+ }
+ break;
+ }
+ }
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ break;
+ }
+#if ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK
+ case '(': {
+ unsigned pos;
+
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+# if ENABLE_SH_MATH_SUPPORT
+ if (i_peek(input) == '(') {
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ o_addchr(dest, /*quote_mask |*/ '+');
+ if (!BB_MMU)
+ pos = dest->length;
+ add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG);
+ if (as_string) {
+ o_addstr(as_string, dest->data + pos);
+ o_addchr(as_string, ')');
+ o_addchr(as_string, ')');
+ }
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ break;
+ }
+# endif
+# if ENABLE_HUSH_TICK
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ o_addchr(dest, quote_mask | '`');
+ if (!BB_MMU)
+ pos = dest->length;
+ add_till_closing_bracket(dest, input, ')');
+ if (as_string) {
+ o_addstr(as_string, dest->data + pos);
+ o_addchr(as_string, ')');
+ }
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+# endif
+ break;
+ }
+#endif
+ case '_':
+ ch = i_getch(input);
+ nommu_addchr(as_string, ch);
+ ch = i_peek(input);
+ if (isalnum(ch)) { /* it's $_name or $_123 */
+ ch = '_';
+ goto make_var;
+ }
+ /* else: it's $_ */
+ /* TODO: $_ and $-: */
+ /* $_ Shell or shell script name; or last argument of last command
+ * (if last command wasn't a pipe; if it was, bash sets $_ to "");
+ * but in command's env, set to full pathname used to invoke it */
+ /* $- Option flags set by set builtin or shell options (-i etc) */
+ default:
+ o_addQchr(dest, '$');
+ }
+ debug_printf_parse("parse_dollar return 0\n");
+ return 0;
+#undef as_string
+}
+
#if BB_MMU
#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
parse_stream_dquoted(dest, input, dquote_end)
+#define as_string NULL
#endif
static int parse_stream_dquoted(o_string *as_string,
o_string *dest,
struct in_str *input,
- int dquote_end);
+ int dquote_end)
+{
+ int ch;
+ int next;
+
+ again:
+ ch = i_getch(input);
+ if (ch != EOF)
+ nommu_addchr(as_string, ch);
+ if (ch == dquote_end) { /* may be only '"' or EOF */
+ if (dest->o_assignment == NOT_ASSIGNMENT)
+ dest->o_escape ^= 1;
+ debug_printf_parse("parse_stream_dquoted return 0\n");
+ return 0;
+ }
+ /* note: can't move it above ch == dquote_end check! */
+ if (ch == EOF) {
+ syntax_error_unterm_ch('"');
+ /*xfunc_die(); - redundant */
+ }
+ next = '\0';
+ if (ch != '\n') {
+ next = i_peek(input);
+ }
+ debug_printf_parse("\" ch=%c (%d) escape=%d\n",
+ ch, ch, dest->o_escape);
+ if (ch == '\\') {
+ if (next == EOF) {
+ syntax_error("\\<eof>");
+ xfunc_die();
+ }
+ /* bash:
+ * "The backslash retains its special meaning [in "..."]
+ * only when followed by one of the following characters:
+ * $, `, ", \, or <newline>. A double quote may be quoted
+ * within double quotes by preceding it with a backslash."
+ */
+ if (strchr("$`\"\\\n", next) != NULL) {
+ ch = i_getch(input);
+ if (ch != '\n') {
+ o_addqchr(dest, ch);
+ nommu_addchr(as_string, ch);
+ }
+ } else {
+ o_addqchr(dest, '\\');
+ nommu_addchr(as_string, '\\');
+ }
+ goto again;
+ }
+ if (ch == '$') {
+ if (parse_dollar(as_string, dest, input) != 0) {
+ debug_printf_parse("parse_stream_dquoted return 1: "
+ "parse_dollar returned non-0\n");
+ return 1;
+ }
+ goto again;
+ }
+#if ENABLE_HUSH_TICK
+ if (ch == '`') {
+ //unsigned pos = dest->length;
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ o_addchr(dest, 0x80 | '`');
+ add_till_backquote(dest, input);
+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
+ //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
+ goto again;
+ }
+#endif
+ o_addQchr(dest, ch);
+ if (ch == '='
+ && (dest->o_assignment == MAYBE_ASSIGNMENT
+ || dest->o_assignment == WORD_IS_KEYWORD)
+ && is_well_formed_var_name(dest->data, '=')
+ ) {
+ dest->o_assignment = DEFINITELY_ASSIGNMENT;
+ }
+ goto again;
+#undef as_string
+}
+
+/*
+ * Scan input until EOF or end_trigger char.
+ * Return a list of pipes to execute, or NULL on EOF
+ * or if end_trigger character is met.
+ * On syntax error, exit is shell is not interactive,
+ * reset parsing machinery and start parsing anew,
+ * or return ERR_PTR.
+ */
+static struct pipe *parse_stream(char **pstring,
+ struct in_str *input,
+ int end_trigger)
+{
+ struct parse_context ctx;
+ o_string dest = NULL_O_STRING;
+ int is_in_dquote;
+ int heredoc_cnt;
+
+ /* Double-quote state is handled in the state variable is_in_dquote.
+ * A single-quote triggers a bypass of the main loop until its mate is
+ * found. When recursing, quote state is passed in via dest->o_escape.
+ */
+ debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
+ end_trigger ? end_trigger : 'X');
+ debug_enter();
+
+ /* If very first arg is "" or '', dest.data may end up NULL.
+ * Preventing this: */
+ o_addchr(&dest, '\0');
+ dest.length = 0;
+
+ G.ifs = get_local_var_value("IFS");
+ if (G.ifs == NULL)
+ G.ifs = defifs;
+
+ reset:
+#if ENABLE_HUSH_INTERACTIVE
+ input->promptmode = 0; /* PS1 */
+#endif
+ /* dest.o_assignment = MAYBE_ASSIGNMENT; - already is */
+ initialize_context(&ctx);
+ is_in_dquote = 0;
+ heredoc_cnt = 0;
+ while (1) {
+ const char *is_ifs;
+ const char *is_special;
+ int ch;
+ int next;
+ int redir_fd;
+ redir_type redir_style;
+
+ if (is_in_dquote) {
+ /* dest.has_quoted_part = 1; - already is (see below) */
+ if (parse_stream_dquoted(&ctx.as_string, &dest, input, '"')) {
+ goto parse_error;
+ }
+ /* We reached closing '"' */
+ is_in_dquote = 0;
+ }
+ ch = i_getch(input);
+ debug_printf_parse(": ch=%c (%d) escape=%d\n",
+ ch, ch, dest.o_escape);
+ if (ch == EOF) {
+ struct pipe *pi;
+
+ if (heredoc_cnt) {
+ syntax_error_unterm_str("here document");
+ goto parse_error;
+ }
+ /* end_trigger == '}' case errors out earlier,
+ * checking only ')' */
+ if (end_trigger == ')') {
+ syntax_error_unterm_ch('('); /* exits */
+ /* goto parse_error; */
+ }
+
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ o_free(&dest);
+ done_pipe(&ctx, PIPE_SEQ);
+ pi = ctx.list_head;
+ /* If we got nothing... */
+ /* (this makes bare "&" cmd a no-op.
+ * bash says: "syntax error near unexpected token '&'") */
+ if (pi->num_cmds == 0
+ IF_HAS_KEYWORDS( && pi->res_word == RES_NONE)
+ ) {
+ free_pipe_list(pi);
+ pi = NULL;
+ }
+#if !BB_MMU
+ debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
+ if (pstring)
+ *pstring = ctx.as_string.data;
+ else
+ o_free_unsafe(&ctx.as_string);
+#endif
+ debug_leave();
+ debug_printf_parse("parse_stream return %p\n", pi);
+ return pi;
+ }
+ nommu_addchr(&ctx.as_string, ch);
+
+ next = '\0';
+ if (ch != '\n')
+ next = i_peek(input);
+
+ is_special = "{}<>;&|()#'" /* special outside of "str" */
+ "\\$\"" IF_HUSH_TICK("`"); /* always special */
+ /* Are { and } special here? */
+ if (ctx.command->argv /* word [word]{... - non-special */
+ || dest.length /* word{... - non-special */
+ || dest.has_quoted_part /* ""{... - non-special */
+ || (next != ';' /* }; - special */
+ && next != ')' /* }) - special */
+ && next != '&' /* }& and }&& ... - special */
+ && next != '|' /* }|| ... - special */
+ && !strchr(G.ifs, next) /* {word - non-special */
+ )
+ ) {
+ /* They are not special, skip "{}" */
+ is_special += 2;
+ }
+ is_special = strchr(is_special, ch);
+ is_ifs = strchr(G.ifs, ch);
+
+ if (!is_special && !is_ifs) { /* ordinary char */
+ ordinary_char:
+ o_addQchr(&dest, ch);
+ if ((dest.o_assignment == MAYBE_ASSIGNMENT
+ || dest.o_assignment == WORD_IS_KEYWORD)
+ && ch == '='
+ && is_well_formed_var_name(dest.data, '=')
+ ) {
+ dest.o_assignment = DEFINITELY_ASSIGNMENT;
+ }
+ continue;
+ }
+
+ if (is_ifs) {
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ if (ch == '\n') {
+#if ENABLE_HUSH_CASE
+ /* "case ... in <newline> word) ..." -
+ * newlines are ignored (but ';' wouldn't be) */
+ if (ctx.command->argv == NULL
+ && ctx.ctx_res_w == RES_MATCH
+ ) {
+ continue;
+ }
+#endif
+ /* Treat newline as a command separator. */
+ done_pipe(&ctx, PIPE_SEQ);
+ debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
+ if (heredoc_cnt) {
+ if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
+ goto parse_error;
+ }
+ heredoc_cnt = 0;
+ }
+ dest.o_assignment = MAYBE_ASSIGNMENT;
+ ch = ';';
+ /* note: if (is_ifs) continue;
+ * will still trigger for us */
+ }
+ }
+
+ /* "cmd}" or "cmd }..." without semicolon or &:
+ * } is an ordinary char in this case, even inside { cmd; }
+ * Pathological example: { ""}; } should exec "}" cmd
+ */
+ if (ch == '}') {
+ if (!IS_NULL_CMD(ctx.command) /* cmd } */
+ || dest.length != 0 /* word} */
+ || dest.has_quoted_part /* ""} */
+ ) {
+ goto ordinary_char;
+ }
+ if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
+ goto skip_end_trigger;
+ /* else: } does terminate a group */
+ }
+
+ if (end_trigger && end_trigger == ch
+ && (ch != ';' || heredoc_cnt == 0)
+#if ENABLE_HUSH_CASE
+ && (ch != ')'
+ || ctx.ctx_res_w != RES_MATCH
+ || (!dest.has_quoted_part && strcmp(dest.data, "esac") == 0)
+ )
+#endif
+ ) {
+ if (heredoc_cnt) {
+ /* This is technically valid:
+ * { cat <<HERE; }; echo Ok
+ * heredoc
+ * heredoc
+ * HERE
+ * but we don't support this.
+ * We require heredoc to be in enclosing {}/(),
+ * if any.
+ */
+ syntax_error_unterm_str("here document");
+ goto parse_error;
+ }
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ done_pipe(&ctx, PIPE_SEQ);
+ dest.o_assignment = MAYBE_ASSIGNMENT;
+ /* Do we sit outside of any if's, loops or case's? */
+ if (!HAS_KEYWORDS
+ IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
+ ) {
+ o_free(&dest);
+#if !BB_MMU
+ debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
+ if (pstring)
+ *pstring = ctx.as_string.data;
+ else
+ o_free_unsafe(&ctx.as_string);
+#endif
+ debug_leave();
+ debug_printf_parse("parse_stream return %p: "
+ "end_trigger char found\n",
+ ctx.list_head);
+ return ctx.list_head;
+ }
+ }
+ skip_end_trigger:
+ if (is_ifs)
+ continue;
+
+ /* Catch <, > before deciding whether this word is
+ * an assignment. a=1 2>z b=2: b=2 is still assignment */
+ switch (ch) {
+ case '>':
+ redir_fd = redirect_opt_num(&dest);
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ redir_style = REDIRECT_OVERWRITE;
+ if (next == '>') {
+ redir_style = REDIRECT_APPEND;
+ ch = i_getch(input);
+ nommu_addchr(&ctx.as_string, ch);
+ }
+#if 0
+ else if (next == '(') {
+ syntax_error(">(process) not supported");
+ goto parse_error;
+ }
+#endif
+ if (parse_redirect(&ctx, redir_fd, redir_style, input))
+ goto parse_error;
+ continue; /* back to top of while (1) */
+ case '<':
+ redir_fd = redirect_opt_num(&dest);
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ redir_style = REDIRECT_INPUT;
+ if (next == '<') {
+ redir_style = REDIRECT_HEREDOC;
+ heredoc_cnt++;
+ debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
+ ch = i_getch(input);
+ nommu_addchr(&ctx.as_string, ch);
+ } else if (next == '>') {
+ redir_style = REDIRECT_IO;
+ ch = i_getch(input);
+ nommu_addchr(&ctx.as_string, ch);
+ }
+#if 0
+ else if (next == '(') {
+ syntax_error("<(process) not supported");
+ goto parse_error;
+ }
+#endif
+ if (parse_redirect(&ctx, redir_fd, redir_style, input))
+ goto parse_error;
+ continue; /* back to top of while (1) */
+ }
+
+ if (dest.o_assignment == MAYBE_ASSIGNMENT
+ /* check that we are not in word in "a=1 2>word b=1": */
+ && !ctx.pending_redirect
+ ) {
+ /* ch is a special char and thus this word
+ * cannot be an assignment */
+ dest.o_assignment = NOT_ASSIGNMENT;
+ }
+
+ /* Note: nommu_addchr(&ctx.as_string, ch) is already done */
+
+ switch (ch) {
+ case '#':
+ if (dest.length == 0) {
+ while (1) {
+ ch = i_peek(input);
+ if (ch == EOF || ch == '\n')
+ break;
+ i_getch(input);
+ /* note: we do not add it to &ctx.as_string */
+ }
+ nommu_addchr(&ctx.as_string, '\n');
+ } else {
+ o_addQchr(&dest, ch);
+ }
+ break;
+ case '\\':
+ if (next == EOF) {
+ syntax_error("\\<eof>");
+ xfunc_die();
+ }
+ ch = i_getch(input);
+ if (ch != '\n') {
+ o_addchr(&dest, '\\');
+ /*nommu_addchr(&ctx.as_string, '\\'); - already done */
+ o_addchr(&dest, ch);
+ nommu_addchr(&ctx.as_string, ch);
+ /* Example: echo Hello \2>file
+ * we need to know that word 2 is quoted */
+ dest.has_quoted_part = 1;
+ }
+#if !BB_MMU
+ else {
+ /* It's "\<newline>". Remove trailing '\' from ctx.as_string */
+ ctx.as_string.data[--ctx.as_string.length] = '\0';
+ }
+#endif
+ break;
+ case '$':
+ if (parse_dollar(&ctx.as_string, &dest, input) != 0) {
+ debug_printf_parse("parse_stream parse error: "
+ "parse_dollar returned non-0\n");
+ goto parse_error;
+ }
+ break;
+ case '\'':
+ dest.has_quoted_part = 1;
+ while (1) {
+ ch = i_getch(input);
+ if (ch == EOF) {
+ syntax_error_unterm_ch('\'');
+ /*xfunc_die(); - redundant */
+ }
+ nommu_addchr(&ctx.as_string, ch);
+ if (ch == '\'')
+ break;
+ o_addqchr(&dest, ch);
+ }
+ break;
+ case '"':
+ dest.has_quoted_part = 1;
+ is_in_dquote ^= 1; /* invert */
+ if (dest.o_assignment == NOT_ASSIGNMENT)
+ dest.o_escape ^= 1;
+ break;
+#if ENABLE_HUSH_TICK
+ case '`': {
+ unsigned pos;
+
+ o_addchr(&dest, SPECIAL_VAR_SYMBOL);
+ o_addchr(&dest, '`');
+ pos = dest.length;
+ add_till_backquote(&dest, input);
+# if !BB_MMU
+ o_addstr(&ctx.as_string, dest.data + pos);
+ o_addchr(&ctx.as_string, '`');
+# endif
+ o_addchr(&dest, SPECIAL_VAR_SYMBOL);
+ //debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
+ break;
+ }
+#endif
+ case ';':
+#if ENABLE_HUSH_CASE
+ case_semi:
+#endif
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ done_pipe(&ctx, PIPE_SEQ);
+#if ENABLE_HUSH_CASE
+ /* Eat multiple semicolons, detect
+ * whether it means something special */
+ while (1) {
+ ch = i_peek(input);
+ if (ch != ';')
+ break;
+ ch = i_getch(input);
+ nommu_addchr(&ctx.as_string, ch);
+ if (ctx.ctx_res_w == RES_CASE_BODY) {
+ ctx.ctx_dsemicolon = 1;
+ ctx.ctx_res_w = RES_MATCH;
+ break;
+ }
+ }
+#endif
+ new_cmd:
+ /* We just finished a cmd. New one may start
+ * with an assignment */
+ dest.o_assignment = MAYBE_ASSIGNMENT;
+ break;
+ case '&':
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+ if (next == '&') {
+ ch = i_getch(input);
+ nommu_addchr(&ctx.as_string, ch);
+ done_pipe(&ctx, PIPE_AND);
+ } else {
+ done_pipe(&ctx, PIPE_BG);
+ }
+ goto new_cmd;
+ case '|':
+ if (done_word(&dest, &ctx)) {
+ goto parse_error;
+ }
+#if ENABLE_HUSH_CASE
+ if (ctx.ctx_res_w == RES_MATCH)
+ break; /* we are in case's "word | word)" */
+#endif
+ if (next == '|') { /* || */
+ ch = i_getch(input);
+ nommu_addchr(&ctx.as_string, ch);
+ done_pipe(&ctx, PIPE_OR);
+ } else {
+ /* we could pick up a file descriptor choice here
+ * with redirect_opt_num(), but bash doesn't do it.
+ * "echo foo 2| cat" yields "foo 2". */
+ done_command(&ctx);
+#if !BB_MMU
+ o_reset_to_empty_unquoted(&ctx.as_string);
+#endif
+ }
+ goto new_cmd;
+ case '(':
+#if ENABLE_HUSH_CASE
+ /* "case... in [(]word)..." - skip '(' */
+ if (ctx.ctx_res_w == RES_MATCH
+ && ctx.command->argv == NULL /* not (word|(... */
+ && dest.length == 0 /* not word(... */
+ && dest.has_quoted_part == 0 /* not ""(... */
+ ) {
+ continue;
+ }
+#endif
+ case '{':
+ if (parse_group(&dest, &ctx, input, ch) != 0) {
+ goto parse_error;
+ }
+ goto new_cmd;
+ case ')':
+#if ENABLE_HUSH_CASE
+ if (ctx.ctx_res_w == RES_MATCH)
+ goto case_semi;
+#endif
+ case '}':
+ /* proper use of this character is caught by end_trigger:
+ * if we see {, we call parse_group(..., end_trigger='}')
+ * and it will match } earlier (not here). */
+ syntax_error_unexpected_ch(ch);
+ goto parse_error;
+ default:
+ if (HUSH_DEBUG)
+ bb_error_msg_and_die("BUG: unexpected %c\n", ch);
+ }
+ } /* while (1) */
+
+ parse_error:
+ {
+ struct parse_context *pctx;
+ IF_HAS_KEYWORDS(struct parse_context *p2;)
+
+ /* Clean up allocated tree.
+ * Sample for finding leaks on syntax error recovery path.
+ * Run it from interactive shell, watch pmap `pidof hush`.
+ * while if false; then false; fi; do break; fi
+ * Samples to catch leaks at execution:
+ * while if (true | {true;}); then echo ok; fi; do break; done
+ * while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
+ */
+ pctx = &ctx;
+ do {
+ /* Update pipe/command counts,
+ * otherwise freeing may miss some */
+ done_pipe(pctx, PIPE_SEQ);
+ debug_printf_clean("freeing list %p from ctx %p\n",
+ pctx->list_head, pctx);
+ debug_print_tree(pctx->list_head, 0);
+ free_pipe_list(pctx->list_head);
+ debug_printf_clean("freed list %p\n", pctx->list_head);
+#if !BB_MMU
+ o_free_unsafe(&pctx->as_string);
+#endif
+ IF_HAS_KEYWORDS(p2 = pctx->stack;)
+ if (pctx != &ctx) {
+ free(pctx);
+ }
+ IF_HAS_KEYWORDS(pctx = p2;)
+ } while (HAS_KEYWORDS && pctx);
+ /* Free text, clear all dest fields */
+ o_free(&dest);
+ /* If we are not in top-level parse, we return,
+ * our caller will propagate error.
+ */
+ if (end_trigger != ';') {
+#if !BB_MMU
+ if (pstring)
+ *pstring = NULL;
+#endif
+ debug_leave();
+ return ERR_PTR;
+ }
+ /* Discard cached input, force prompt */
+ input->p = NULL;
+ IF_HUSH_INTERACTIVE(input->promptme = 1;)
+ goto reset;
+ }
+}
+
+
+/*** Execution routines ***/
+
+/* Expansion can recurse, need forward decls: */
+static char *expand_string_to_string(const char *str);
+static int process_command_subs(o_string *dest, const char *s);
/* expand_strvec_to_strvec() takes a list of strings, expands
* all variable references within and returns a pointer to
@@ -3463,6 +5307,194 @@ static void re_execute_shell(char ***to_free, const char *s,
#endif /* !BB_MMU */
+static int run_and_free_list(struct pipe *pi);
+
+/* Executing from string: eval, sh -c '...'
+ * or from file: /etc/profile, . file, sh <script>, sh (intereactive)
+ * end_trigger controls how often we stop parsing
+ * NUL: parse all, execute, return
+ * ';': parse till ';' or newline, execute, repeat till EOF
+ */
+static void parse_and_run_stream(struct in_str *inp, int end_trigger)
+{
+ /* Why we need empty flag?
+ * An obscure corner case "false; ``; echo $?":
+ * empty command in `` should still set $? to 0.
+ * But we can't just set $? to 0 at the start,
+ * this breaks "false; echo `echo $?`" case.
+ */
+ bool empty = 1;
+ while (1) {
+ struct pipe *pipe_list;
+
+ pipe_list = parse_stream(NULL, inp, end_trigger);
+ if (!pipe_list) { /* EOF */
+ if (empty)
+ G.last_exitcode = 0;
+ break;
+ }
+ debug_print_tree(pipe_list, 0);
+ debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
+ run_and_free_list(pipe_list);
+ empty = 0;
+ }
+}
+
+static void parse_and_run_string(const char *s)
+{
+ struct in_str input;
+ setup_string_in_str(&input, s);
+ parse_and_run_stream(&input, '\0');
+}
+
+static void parse_and_run_file(FILE *f)
+{
+ struct in_str input;
+ setup_file_in_str(&input, f);
+ parse_and_run_stream(&input, ';');
+}
+
+#if ENABLE_HUSH_TICK
+static FILE *generate_stream_from_string(const char *s, pid_t *pid_p)
+{
+ pid_t pid;
+ int channel[2];
+# if !BB_MMU
+ char **to_free = NULL;
+# endif
+
+ xpipe(channel);
+ pid = BB_MMU ? xfork() : xvfork();
+ if (pid == 0) { /* child */
+ disable_restore_tty_pgrp_on_exit();
+ /* Process substitution is not considered to be usual
+ * 'command execution'.
+ * SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
+ */
+ bb_signals(0
+ + (1 << SIGTSTP)
+ + (1 << SIGTTIN)
+ + (1 << SIGTTOU)
+ , SIG_IGN);
+ CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
+ close(channel[0]); /* NB: close _first_, then move fd! */
+ xmove_fd(channel[1], 1);
+ /* Prevent it from trying to handle ctrl-z etc */
+ IF_HUSH_JOB(G.run_list_level = 1;)
+ /* Awful hack for `trap` or $(trap).
+ *
+ * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
+ * contains an example where "trap" is executed in a subshell:
+ *
+ * save_traps=$(trap)
+ * ...
+ * eval "$save_traps"
+ *
+ * Standard does not say that "trap" in subshell shall print
+ * parent shell's traps. It only says that its output
+ * must have suitable form, but then, in the above example
+ * (which is not supposed to be normative), it implies that.
+ *
+ * bash (and probably other shell) does implement it
+ * (traps are reset to defaults, but "trap" still shows them),
+ * but as a result, "trap" logic is hopelessly messed up:
+ *
+ * # trap
+ * trap -- 'echo Ho' SIGWINCH <--- we have a handler
+ * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
+ * # true | trap <--- trap is in subshell - no output (ditto)
+ * # echo `true | trap` <--- in subshell - output (but traps are reset!)
+ * trap -- 'echo Ho' SIGWINCH
+ * # echo `(trap)` <--- in subshell in subshell - output
+ * trap -- 'echo Ho' SIGWINCH
+ * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
+ * trap -- 'echo Ho' SIGWINCH
+ *
+ * The rules when to forget and when to not forget traps
+ * get really complex and nonsensical.
+ *
+ * Our solution: ONLY bare $(trap) or `trap` is special.
+ */
+ s = skip_whitespace(s);
+ if (strncmp(s, "trap", 4) == 0
+ && skip_whitespace(s + 4)[0] == '\0'
+ ) {
+ static const char *const argv[] = { NULL, NULL };
+ builtin_trap((char**)argv);
+ exit(0); /* not _exit() - we need to fflush */
+ }
+# if BB_MMU
+ reset_traps_to_defaults();
+ parse_and_run_string(s);
+ _exit(G.last_exitcode);
+# else
+ /* We re-execute after vfork on NOMMU. This makes this script safe:
+ * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
+ * huge=`cat BIG` # was blocking here forever
+ * echo OK
+ */
+ re_execute_shell(&to_free,
+ s,
+ G.global_argv[0],
+ G.global_argv + 1,
+ NULL);
+# endif
+ }
+
+ /* parent */
+ *pid_p = pid;
+# if ENABLE_HUSH_FAST
+ G.count_SIGCHLD++;
+//bb_error_msg("[%d] fork in generate_stream_from_string:"
+// " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d",
+// getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
+# endif
+ enable_restore_tty_pgrp_on_exit();
+# if !BB_MMU
+ free(to_free);
+# endif
+ close(channel[1]);
+ close_on_exec_on(channel[0]);
+ return xfdopen_for_read(channel[0]);
+}
+
+/* Return code is exit status of the process that is run. */
+static int process_command_subs(o_string *dest, const char *s)
+{
+ FILE *fp;
+ struct in_str pipe_str;
+ pid_t pid;
+ int status, ch, eol_cnt;
+
+ fp = generate_stream_from_string(s, &pid);
+
+ /* Now send results of command back into original context */
+ setup_file_in_str(&pipe_str, fp);
+ eol_cnt = 0;
+ while ((ch = i_getch(&pipe_str)) != EOF) {
+ if (ch == '\n') {
+ eol_cnt++;
+ continue;
+ }
+ while (eol_cnt) {
+ o_addchr(dest, '\n');
+ eol_cnt--;
+ }
+ o_addQchr(dest, ch);
+ }
+
+ debug_printf("done reading from `cmd` pipe, closing it\n");
+ fclose(fp);
+ /* We need to extract exitcode. Test case
+ * "true; echo `sleep 1; false` $?"
+ * should print 1 */
+ safe_waitpid(pid, &status, 0);
+ debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status));
+ return WEXITSTATUS(status);
+}
+#endif /* ENABLE_HUSH_TICK */
+
+
static void setup_heredoc(struct redir_struct *redir)
{
struct fd_pair pair;
@@ -3622,101 +5654,6 @@ static void restore_redirects(int squirrel[])
}
}
-
-static void free_pipe_list(struct pipe *head);
-
-/* Return code is the exit status of the pipe */
-static void free_pipe(struct pipe *pi)
-{
- char **p;
- struct command *command;
- struct redir_struct *r, *rnext;
- int a, i;
-
- if (pi->stopped_cmds > 0) /* why? */
- return;
- debug_printf_clean("run pipe: (pid %d)\n", getpid());
- for (i = 0; i < pi->num_cmds; i++) {
- command = &pi->cmds[i];
- debug_printf_clean(" command %d:\n", i);
- if (command->argv) {
- for (a = 0, p = command->argv; *p; a++, p++) {
- debug_printf_clean(" argv[%d] = %s\n", a, *p);
- }
- free_strings(command->argv);
- command->argv = NULL;
- }
- /* not "else if": on syntax error, we may have both! */
- if (command->group) {
- debug_printf_clean(" begin group (cmd_type:%d)\n",
- command->cmd_type);
- free_pipe_list(command->group);
- debug_printf_clean(" end group\n");
- command->group = NULL;
- }
- /* else is crucial here.
- * If group != NULL, child_func is meaningless */
-#if ENABLE_HUSH_FUNCTIONS
- else if (command->child_func) {
- debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
- command->child_func->parent_cmd = NULL;
- }
-#endif
-#if !BB_MMU
- free(command->group_as_string);
- command->group_as_string = NULL;
-#endif
- for (r = command->redirects; r; r = rnext) {
- debug_printf_clean(" redirect %d%s",
- r->rd_fd, redir_table[r->rd_type].descrip);
- /* guard against the case >$FOO, where foo is unset or blank */
- if (r->rd_filename) {
- debug_printf_clean(" fname:'%s'\n", r->rd_filename);
- free(r->rd_filename);
- r->rd_filename = NULL;
- }
- debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
- rnext = r->next;
- free(r);
- }
- command->redirects = NULL;
- }
- free(pi->cmds); /* children are an array, they get freed all at once */
- pi->cmds = NULL;
-#if ENABLE_HUSH_JOB
- free(pi->cmdtext);
- pi->cmdtext = NULL;
-#endif
-}
-
-static void free_pipe_list(struct pipe *head)
-{
- struct pipe *pi, *next;
-
- for (pi = head; pi; pi = next) {
-#if HAS_KEYWORDS
- debug_printf_clean(" pipe reserved word %d\n", pi->res_word);
-#endif
- free_pipe(pi);
- debug_printf_clean("pipe followup code %d\n", pi->followup);
- next = pi->next;
- /*pi->next = NULL;*/
- free(pi);
- }
-}
-
-
-static int run_list(struct pipe *pi);
-#if BB_MMU
-#define parse_stream(pstring, input, end_trigger) \
- parse_stream(input, end_trigger)
-#endif
-static struct pipe *parse_stream(char **pstring,
- struct in_str *input,
- int end_trigger);
-static void parse_and_run_string(const char *s);
-
-
static char *find_in_path(const char *arg)
{
char *ret = NULL;
@@ -4482,7 +6419,11 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
#define redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel, char argv_expanded) \
redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel)
#endif
-static int redirect_and_varexp_helper(char ***new_env_p, struct variable **old_vars_p, struct command *command, int squirrel[3], char **argv_expanded)
+static int redirect_and_varexp_helper(char ***new_env_p,
+ struct variable **old_vars_p,
+ struct command *command,
+ int squirrel[3],
+ char **argv_expanded)
{
/* setup_redirects acts on file descriptors, not FILEs.
* This is perfect for work that comes after exec().
@@ -5291,1947 +7232,6 @@ static int run_and_free_list(struct pipe *pi)
}
-static struct pipe *new_pipe(void)
-{
- struct pipe *pi;
- pi = xzalloc(sizeof(struct pipe));
- /*pi->followup = 0; - deliberately invalid value */
- /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
- return pi;
-}
-
-/* Command (member of a pipe) is complete, or we start a new pipe
- * if ctx->command is NULL.
- * No errors possible here.
- */
-static int done_command(struct parse_context *ctx)
-{
- /* The command is really already in the pipe structure, so
- * advance the pipe counter and make a new, null command. */
- struct pipe *pi = ctx->pipe;
- struct command *command = ctx->command;
-
- if (command) {
- if (IS_NULL_CMD(command)) {
- debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
- goto clear_and_ret;
- }
- pi->num_cmds++;
- debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
- //debug_print_tree(ctx->list_head, 20);
- } else {
- debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
- }
-
- /* Only real trickiness here is that the uncommitted
- * command structure is not counted in pi->num_cmds. */
- pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
- ctx->command = command = &pi->cmds[pi->num_cmds];
- clear_and_ret:
- memset(command, 0, sizeof(*command));
- return pi->num_cmds; /* used only for 0/nonzero check */
-}
-
-static void done_pipe(struct parse_context *ctx, pipe_style type)
-{
- int not_null;
-
- debug_printf_parse("done_pipe entered, followup %d\n", type);
- /* Close previous command */
- not_null = done_command(ctx);
- ctx->pipe->followup = type;
-#if HAS_KEYWORDS
- ctx->pipe->pi_inverted = ctx->ctx_inverted;
- ctx->ctx_inverted = 0;
- ctx->pipe->res_word = ctx->ctx_res_w;
-#endif
-
- /* Without this check, even just <enter> on command line generates
- * tree of three NOPs (!). Which is harmless but annoying.
- * IOW: it is safe to do it unconditionally. */
- if (not_null
-#if ENABLE_HUSH_IF
- || ctx->ctx_res_w == RES_FI
-#endif
-#if ENABLE_HUSH_LOOPS
- || ctx->ctx_res_w == RES_DONE
- || ctx->ctx_res_w == RES_FOR
- || ctx->ctx_res_w == RES_IN
-#endif
-#if ENABLE_HUSH_CASE
- || ctx->ctx_res_w == RES_ESAC
-#endif
- ) {
- struct pipe *new_p;
- debug_printf_parse("done_pipe: adding new pipe: "
- "not_null:%d ctx->ctx_res_w:%d\n",
- not_null, ctx->ctx_res_w);
- new_p = new_pipe();
- ctx->pipe->next = new_p;
- ctx->pipe = new_p;
- /* RES_THEN, RES_DO etc are "sticky" -
- * they remain set for pipes inside if/while.
- * This is used to control execution.
- * RES_FOR and RES_IN are NOT sticky (needed to support
- * cases where variable or value happens to match a keyword):
- */
-#if ENABLE_HUSH_LOOPS
- if (ctx->ctx_res_w == RES_FOR
- || ctx->ctx_res_w == RES_IN)
- ctx->ctx_res_w = RES_NONE;
-#endif
-#if ENABLE_HUSH_CASE
- if (ctx->ctx_res_w == RES_MATCH)
- ctx->ctx_res_w = RES_CASE_BODY;
- if (ctx->ctx_res_w == RES_CASE)
- ctx->ctx_res_w = RES_CASE_IN;
-#endif
- ctx->command = NULL; /* trick done_command below */
- /* Create the memory for command, roughly:
- * ctx->pipe->cmds = new struct command;
- * ctx->command = &ctx->pipe->cmds[0];
- */
- done_command(ctx);
- //debug_print_tree(ctx->list_head, 10);
- }
- debug_printf_parse("done_pipe return\n");
-}
-
-static void initialize_context(struct parse_context *ctx)
-{
- memset(ctx, 0, sizeof(*ctx));
- ctx->pipe = ctx->list_head = new_pipe();
- /* Create the memory for command, roughly:
- * ctx->pipe->cmds = new struct command;
- * ctx->command = &ctx->pipe->cmds[0];
- */
- done_command(ctx);
-}
-
-/* If a reserved word is found and processed, parse context is modified
- * and 1 is returned.
- */
-#if HAS_KEYWORDS
-struct reserved_combo {
- char literal[6];
- unsigned char res;
- unsigned char assignment_flag;
- int flag;
-};
-enum {
- FLAG_END = (1 << RES_NONE ),
-# if ENABLE_HUSH_IF
- FLAG_IF = (1 << RES_IF ),
- FLAG_THEN = (1 << RES_THEN ),
- FLAG_ELIF = (1 << RES_ELIF ),
- FLAG_ELSE = (1 << RES_ELSE ),
- FLAG_FI = (1 << RES_FI ),
-# endif
-# if ENABLE_HUSH_LOOPS
- FLAG_FOR = (1 << RES_FOR ),
- FLAG_WHILE = (1 << RES_WHILE),
- FLAG_UNTIL = (1 << RES_UNTIL),
- FLAG_DO = (1 << RES_DO ),
- FLAG_DONE = (1 << RES_DONE ),
- FLAG_IN = (1 << RES_IN ),
-# endif
-# if ENABLE_HUSH_CASE
- FLAG_MATCH = (1 << RES_MATCH),
- FLAG_ESAC = (1 << RES_ESAC ),
-# endif
- FLAG_START = (1 << RES_XXXX ),
-};
-
-static const struct reserved_combo* match_reserved_word(o_string *word)
-{
- /* Mostly a list of accepted follow-up reserved words.
- * FLAG_END means we are done with the sequence, and are ready
- * to turn the compound list into a command.
- * FLAG_START means the word must start a new compound list.
- */
- static const struct reserved_combo reserved_list[] = {
-# if ENABLE_HUSH_IF
- { "!", RES_NONE, NOT_ASSIGNMENT , 0 },
- { "if", RES_IF, WORD_IS_KEYWORD, FLAG_THEN | FLAG_START },
- { "then", RES_THEN, WORD_IS_KEYWORD, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
- { "elif", RES_ELIF, WORD_IS_KEYWORD, FLAG_THEN },
- { "else", RES_ELSE, WORD_IS_KEYWORD, FLAG_FI },
- { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
-# endif
-# if ENABLE_HUSH_LOOPS
- { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
- { "while", RES_WHILE, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
- { "until", RES_UNTIL, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
- { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
- { "do", RES_DO, WORD_IS_KEYWORD, FLAG_DONE },
- { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
-# endif
-# if ENABLE_HUSH_CASE
- { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
- { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
-# endif
- };
- const struct reserved_combo *r;
-
- for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
- if (strcmp(word->data, r->literal) == 0)
- return r;
- }
- return NULL;
-}
-/* Return 0: not a keyword, 1: keyword
- */
-static int reserved_word(o_string *word, struct parse_context *ctx)
-{
-# if ENABLE_HUSH_CASE
- static const struct reserved_combo reserved_match = {
- "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
- };
-# endif
- const struct reserved_combo *r;
-
- if (word->has_quoted_part)
- return 0;
- r = match_reserved_word(word);
- if (!r)
- return 0;
-
- debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
-# if ENABLE_HUSH_CASE
- if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
- /* "case word IN ..." - IN part starts first MATCH part */
- r = &reserved_match;
- } else
-# endif
- if (r->flag == 0) { /* '!' */
- if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
- syntax_error("! ! command");
- ctx->ctx_res_w = RES_SNTX;
- }
- ctx->ctx_inverted = 1;
- return 1;
- }
- if (r->flag & FLAG_START) {
- struct parse_context *old;
-
- old = xmalloc(sizeof(*old));
- debug_printf_parse("push stack %p\n", old);
- *old = *ctx; /* physical copy */
- initialize_context(ctx);
- ctx->stack = old;
- } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
- syntax_error_at(word->data);
- ctx->ctx_res_w = RES_SNTX;
- return 1;
- } else {
- /* "{...} fi" is ok. "{...} if" is not
- * Example:
- * if { echo foo; } then { echo bar; } fi */
- if (ctx->command->group)
- done_pipe(ctx, PIPE_SEQ);
- }
-
- ctx->ctx_res_w = r->res;
- ctx->old_flag = r->flag;
- word->o_assignment = r->assignment_flag;
-
- if (ctx->old_flag & FLAG_END) {
- struct parse_context *old;
-
- done_pipe(ctx, PIPE_SEQ);
- debug_printf_parse("pop stack %p\n", ctx->stack);
- old = ctx->stack;
- old->command->group = ctx->list_head;
- old->command->cmd_type = CMD_NORMAL;
-# if !BB_MMU
- o_addstr(&old->as_string, ctx->as_string.data);
- o_free_unsafe(&ctx->as_string);
- old->command->group_as_string = xstrdup(old->as_string.data);
- debug_printf_parse("pop, remembering as:'%s'\n",
- old->command->group_as_string);
-# endif
- *ctx = *old; /* physical copy */
- free(old);
- }
- return 1;
-}
-#endif /* HAS_KEYWORDS */
-
-/* Word is complete, look at it and update parsing context.
- * Normal return is 0. Syntax errors return 1.
- * Note: on return, word is reset, but not o_free'd!
- */
-static int done_word(o_string *word, struct parse_context *ctx)
-{
- struct command *command = ctx->command;
-
- debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
- if (word->length == 0 && !word->has_quoted_part) {
- debug_printf_parse("done_word return 0: true null, ignored\n");
- return 0;
- }
-
- if (ctx->pending_redirect) {
- /* We do not glob in e.g. >*.tmp case. bash seems to glob here
- * only if run as "bash", not "sh" */
- /* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
- * "2.7 Redirection
- * ...the word that follows the redirection operator
- * shall be subjected to tilde expansion, parameter expansion,
- * command substitution, arithmetic expansion, and quote
- * removal. Pathname expansion shall not be performed
- * on the word by a non-interactive shell; an interactive
- * shell may perform it, but shall do so only when
- * the expansion would result in one word."
- */
- ctx->pending_redirect->rd_filename = xstrdup(word->data);
- /* Cater for >\file case:
- * >\a creates file a; >\\a, >"\a", >"\\a" create file \a
- * Same with heredocs:
- * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
- */
- if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
- unbackslash(ctx->pending_redirect->rd_filename);
- /* Is it <<"HEREDOC"? */
- if (word->has_quoted_part) {
- ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
- }
- }
- debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
- ctx->pending_redirect = NULL;
- } else {
- /* If this word wasn't an assignment, next ones definitely
- * can't be assignments. Even if they look like ones. */
- if (word->o_assignment != DEFINITELY_ASSIGNMENT
- && word->o_assignment != WORD_IS_KEYWORD
- ) {
- word->o_assignment = NOT_ASSIGNMENT;
- } else {
- if (word->o_assignment == DEFINITELY_ASSIGNMENT)
- command->assignment_cnt++;
- word->o_assignment = MAYBE_ASSIGNMENT;
- }
-
-#if HAS_KEYWORDS
-# if ENABLE_HUSH_CASE
- if (ctx->ctx_dsemicolon
- && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
- ) {
- /* already done when ctx_dsemicolon was set to 1: */
- /* ctx->ctx_res_w = RES_MATCH; */
- ctx->ctx_dsemicolon = 0;
- } else
-# endif
- if (!command->argv /* if it's the first word... */
-# if ENABLE_HUSH_LOOPS
- && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
- && ctx->ctx_res_w != RES_IN
-# endif
-# if ENABLE_HUSH_CASE
- && ctx->ctx_res_w != RES_CASE
-# endif
- ) {
- debug_printf_parse("checking '%s' for reserved-ness\n", word->data);
- if (reserved_word(word, ctx)) {
- o_reset_to_empty_unquoted(word);
- debug_printf_parse("done_word return %d\n",
- (ctx->ctx_res_w == RES_SNTX));
- return (ctx->ctx_res_w == RES_SNTX);
- }
-# ifdef CMD_SINGLEWORD_NOGLOB_COND
- if (strcmp(word->data, "export") == 0
-# if ENABLE_HUSH_LOCAL
- || strcmp(word->data, "local") == 0
-# endif
- ) {
- command->cmd_type = CMD_SINGLEWORD_NOGLOB_COND;
- } else
-# endif
-# if ENABLE_HUSH_BASH_COMPAT
- if (strcmp(word->data, "[[") == 0) {
- command->cmd_type = CMD_SINGLEWORD_NOGLOB;
- }
- /* fall through */
-# endif
- }
-#endif
- if (command->group) {
- /* "{ echo foo; } echo bar" - bad */
- syntax_error_at(word->data);
- debug_printf_parse("done_word return 1: syntax error, "
- "groups and arglists don't mix\n");
- return 1;
- }
- if (word->has_quoted_part
- /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
- && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
- /* (otherwise it's known to be not empty and is already safe) */
- ) {
- /* exclude "$@" - it can expand to no word despite "" */
- char *p = word->data;
- while (p[0] == SPECIAL_VAR_SYMBOL
- && (p[1] & 0x7f) == '@'
- && p[2] == SPECIAL_VAR_SYMBOL
- ) {
- p += 3;
- }
- if (p == word->data || p[0] != '\0') {
- /* saw no "$@", or not only "$@" but some
- * real text is there too */
- /* insert "empty variable" reference, this makes
- * e.g. "", $empty"" etc to not disappear */
- o_addchr(word, SPECIAL_VAR_SYMBOL);
- o_addchr(word, SPECIAL_VAR_SYMBOL);
- }
- }
- command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
- debug_print_strings("word appended to argv", command->argv);
- }
-
-#if ENABLE_HUSH_LOOPS
- if (ctx->ctx_res_w == RES_FOR) {
- if (word->has_quoted_part
- || !is_well_formed_var_name(command->argv[0], '\0')
- ) {
- /* bash says just "not a valid identifier" */
- syntax_error("not a valid identifier in for");
- return 1;
- }
- /* Force FOR to have just one word (variable name) */
- /* NB: basically, this makes hush see "for v in ..."
- * syntax as if it is "for v; in ...". FOR and IN become
- * two pipe structs in parse tree. */
- done_pipe(ctx, PIPE_SEQ);
- }
-#endif
-#if ENABLE_HUSH_CASE
- /* Force CASE to have just one word */
- if (ctx->ctx_res_w == RES_CASE) {
- done_pipe(ctx, PIPE_SEQ);
- }
-#endif
-
- o_reset_to_empty_unquoted(word);
-
- debug_printf_parse("done_word return 0\n");
- return 0;
-}
-
-
-/* Peek ahead in the input to find out if we have a "&n" construct,
- * as in "2>&1", that represents duplicating a file descriptor.
- * Return:
- * REDIRFD_CLOSE if >&- "close fd" construct is seen,
- * REDIRFD_SYNTAX_ERR if syntax error,
- * REDIRFD_TO_FILE if no & was seen,
- * or the number found.
- */
-#if BB_MMU
-#define parse_redir_right_fd(as_string, input) \
- parse_redir_right_fd(input)
-#endif
-static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
-{
- int ch, d, ok;
-
- ch = i_peek(input);
- if (ch != '&')
- return REDIRFD_TO_FILE;
-
- ch = i_getch(input); /* get the & */
- nommu_addchr(as_string, ch);
- ch = i_peek(input);
- if (ch == '-') {
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- return REDIRFD_CLOSE;
- }
- d = 0;
- ok = 0;
- while (ch != EOF && isdigit(ch)) {
- d = d*10 + (ch-'0');
- ok = 1;
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- ch = i_peek(input);
- }
- if (ok) return d;
-
-//TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
-
- bb_error_msg("ambiguous redirect");
- return REDIRFD_SYNTAX_ERR;
-}
-
-/* Return code is 0 normal, 1 if a syntax error is detected
- */
-static int parse_redirect(struct parse_context *ctx,
- int fd,
- redir_type style,
- struct in_str *input)
-{
- struct command *command = ctx->command;
- struct redir_struct *redir;
- struct redir_struct **redirp;
- int dup_num;
-
- dup_num = REDIRFD_TO_FILE;
- if (style != REDIRECT_HEREDOC) {
- /* Check for a '>&1' type redirect */
- dup_num = parse_redir_right_fd(&ctx->as_string, input);
- if (dup_num == REDIRFD_SYNTAX_ERR)
- return 1;
- } else {
- int ch = i_peek(input);
- dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
- if (dup_num) { /* <<-... */
- ch = i_getch(input);
- nommu_addchr(&ctx->as_string, ch);
- ch = i_peek(input);
- }
- }
-
- if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
- int ch = i_peek(input);
- if (ch == '|') {
- /* >|FILE redirect ("clobbering" >).
- * Since we do not support "set -o noclobber" yet,
- * >| and > are the same for now. Just eat |.
- */
- ch = i_getch(input);
- nommu_addchr(&ctx->as_string, ch);
- }
- }
-
- /* Create a new redir_struct and append it to the linked list */
- redirp = &command->redirects;
- while ((redir = *redirp) != NULL) {
- redirp = &(redir->next);
- }
- *redirp = redir = xzalloc(sizeof(*redir));
- /* redir->next = NULL; */
- /* redir->rd_filename = NULL; */
- redir->rd_type = style;
- redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
-
- debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
- redir_table[style].descrip);
-
- redir->rd_dup = dup_num;
- if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
- /* Erik had a check here that the file descriptor in question
- * is legit; I postpone that to "run time"
- * A "-" representation of "close me" shows up as a -3 here */
- debug_printf_parse("duplicating redirect '%d>&%d'\n",
- redir->rd_fd, redir->rd_dup);
- } else {
- /* Set ctx->pending_redirect, so we know what to do at the
- * end of the next parsed word. */
- ctx->pending_redirect = redir;
- }
- return 0;
-}
-
-/* If a redirect is immediately preceded by a number, that number is
- * supposed to tell which file descriptor to redirect. This routine
- * looks for such preceding numbers. In an ideal world this routine
- * needs to handle all the following classes of redirects...
- * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
- * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
- * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
- * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
- *
- * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
- * "2.7 Redirection
- * ... If n is quoted, the number shall not be recognized as part of
- * the redirection expression. For example:
- * echo \2>a
- * writes the character 2 into file a"
- * We are getting it right by setting ->has_quoted_part on any \<char>
- *
- * A -1 return means no valid number was found,
- * the caller should use the appropriate default for this redirection.
- */
-static int redirect_opt_num(o_string *o)
-{
- int num;
-
- if (o->data == NULL)
- return -1;
- num = bb_strtou(o->data, NULL, 10);
- if (errno || num < 0)
- return -1;
- o_reset_to_empty_unquoted(o);
- return num;
-}
-
-#if BB_MMU
-#define fetch_till_str(as_string, input, word, skip_tabs) \
- fetch_till_str(input, word, skip_tabs)
-#endif
-static char *fetch_till_str(o_string *as_string,
- struct in_str *input,
- const char *word,
- int skip_tabs)
-{
- o_string heredoc = NULL_O_STRING;
- int past_EOL = 0;
- int ch;
-
- goto jump_in;
- while (1) {
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- if (ch == '\n') {
- if (strcmp(heredoc.data + past_EOL, word) == 0) {
- heredoc.data[past_EOL] = '\0';
- debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
- return heredoc.data;
- }
- do {
- o_addchr(&heredoc, ch);
- past_EOL = heredoc.length;
- jump_in:
- do {
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- } while (skip_tabs && ch == '\t');
- } while (ch == '\n');
- }
- if (ch == EOF) {
- o_free_unsafe(&heredoc);
- return NULL;
- }
- o_addchr(&heredoc, ch);
- nommu_addchr(as_string, ch);
- }
-}
-
-/* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
- * and load them all. There should be exactly heredoc_cnt of them.
- */
-static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
-{
- struct pipe *pi = ctx->list_head;
-
- while (pi && heredoc_cnt) {
- int i;
- struct command *cmd = pi->cmds;
-
- debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
- pi->num_cmds,
- cmd->argv ? cmd->argv[0] : "NONE");
- for (i = 0; i < pi->num_cmds; i++) {
- struct redir_struct *redir = cmd->redirects;
-
- debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
- i, cmd->argv ? cmd->argv[0] : "NONE");
- while (redir) {
- if (redir->rd_type == REDIRECT_HEREDOC) {
- char *p;
-
- redir->rd_type = REDIRECT_HEREDOC2;
- /* redir->rd_dup is (ab)used to indicate <<- */
- p = fetch_till_str(&ctx->as_string, input,
- redir->rd_filename, redir->rd_dup & HEREDOC_SKIPTABS);
- if (!p) {
- syntax_error("unexpected EOF in here document");
- return 1;
- }
- free(redir->rd_filename);
- redir->rd_filename = p;
- heredoc_cnt--;
- }
- redir = redir->next;
- }
- cmd++;
- }
- pi = pi->next;
- }
-#if 0
- /* Should be 0. If it isn't, it's a parse error */
- if (heredoc_cnt)
- bb_error_msg_and_die("heredoc BUG 2");
-#endif
- return 0;
-}
-
-
-#if ENABLE_HUSH_TICK
-static FILE *generate_stream_from_string(const char *s, pid_t *pid_p)
-{
- pid_t pid;
- int channel[2];
-# if !BB_MMU
- char **to_free = NULL;
-# endif
-
- xpipe(channel);
- pid = BB_MMU ? xfork() : xvfork();
- if (pid == 0) { /* child */
- disable_restore_tty_pgrp_on_exit();
- /* Process substitution is not considered to be usual
- * 'command execution'.
- * SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
- */
- bb_signals(0
- + (1 << SIGTSTP)
- + (1 << SIGTTIN)
- + (1 << SIGTTOU)
- , SIG_IGN);
- CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
- close(channel[0]); /* NB: close _first_, then move fd! */
- xmove_fd(channel[1], 1);
- /* Prevent it from trying to handle ctrl-z etc */
- IF_HUSH_JOB(G.run_list_level = 1;)
- /* Awful hack for `trap` or $(trap).
- *
- * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
- * contains an example where "trap" is executed in a subshell:
- *
- * save_traps=$(trap)
- * ...
- * eval "$save_traps"
- *
- * Standard does not say that "trap" in subshell shall print
- * parent shell's traps. It only says that its output
- * must have suitable form, but then, in the above example
- * (which is not supposed to be normative), it implies that.
- *
- * bash (and probably other shell) does implement it
- * (traps are reset to defaults, but "trap" still shows them),
- * but as a result, "trap" logic is hopelessly messed up:
- *
- * # trap
- * trap -- 'echo Ho' SIGWINCH <--- we have a handler
- * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
- * # true | trap <--- trap is in subshell - no output (ditto)
- * # echo `true | trap` <--- in subshell - output (but traps are reset!)
- * trap -- 'echo Ho' SIGWINCH
- * # echo `(trap)` <--- in subshell in subshell - output
- * trap -- 'echo Ho' SIGWINCH
- * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
- * trap -- 'echo Ho' SIGWINCH
- *
- * The rules when to forget and when to not forget traps
- * get really complex and nonsensical.
- *
- * Our solution: ONLY bare $(trap) or `trap` is special.
- */
- s = skip_whitespace(s);
- if (strncmp(s, "trap", 4) == 0 && (*skip_whitespace(s + 4) == '\0'))
- {
- static const char *const argv[] = { NULL, NULL };
- builtin_trap((char**)argv);
- exit(0); /* not _exit() - we need to fflush */
- }
-# if BB_MMU
- reset_traps_to_defaults();
- parse_and_run_string(s);
- _exit(G.last_exitcode);
-# else
- /* We re-execute after vfork on NOMMU. This makes this script safe:
- * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
- * huge=`cat BIG` # was blocking here forever
- * echo OK
- */
- re_execute_shell(&to_free,
- s,
- G.global_argv[0],
- G.global_argv + 1,
- NULL);
-# endif
- }
-
- /* parent */
- *pid_p = pid;
-# if ENABLE_HUSH_FAST
- G.count_SIGCHLD++;
-//bb_error_msg("[%d] fork in generate_stream_from_string:"
-// " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d",
-// getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
-# endif
- enable_restore_tty_pgrp_on_exit();
-# if !BB_MMU
- free(to_free);
-# endif
- close(channel[1]);
- close_on_exec_on(channel[0]);
- return xfdopen_for_read(channel[0]);
-}
-
-/* Return code is exit status of the process that is run. */
-static int process_command_subs(o_string *dest, const char *s)
-{
- FILE *fp;
- struct in_str pipe_str;
- pid_t pid;
- int status, ch, eol_cnt;
-
- fp = generate_stream_from_string(s, &pid);
-
- /* Now send results of command back into original context */
- setup_file_in_str(&pipe_str, fp);
- eol_cnt = 0;
- while ((ch = i_getch(&pipe_str)) != EOF) {
- if (ch == '\n') {
- eol_cnt++;
- continue;
- }
- while (eol_cnt) {
- o_addchr(dest, '\n');
- eol_cnt--;
- }
- o_addQchr(dest, ch);
- }
-
- debug_printf("done reading from `cmd` pipe, closing it\n");
- fclose(fp);
- /* We need to extract exitcode. Test case
- * "true; echo `sleep 1; false` $?"
- * should print 1 */
- safe_waitpid(pid, &status, 0);
- debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status));
- return WEXITSTATUS(status);
-}
-#endif /* ENABLE_HUSH_TICK */
-
-#if !ENABLE_HUSH_FUNCTIONS
-#define parse_group(dest, ctx, input, ch) \
- parse_group(ctx, input, ch)
-#endif
-static int parse_group(o_string *dest, struct parse_context *ctx,
- struct in_str *input, int ch)
-{
- /* dest contains characters seen prior to ( or {.
- * Typically it's empty, but for function defs,
- * it contains function name (without '()'). */
- struct pipe *pipe_list;
- int endch;
- struct command *command = ctx->command;
-
- debug_printf_parse("parse_group entered\n");
-#if ENABLE_HUSH_FUNCTIONS
- if (ch == '(' && !dest->has_quoted_part) {
- if (dest->length)
- if (done_word(dest, ctx))
- return 1;
- if (!command->argv)
- goto skip; /* (... */
- if (command->argv[1]) { /* word word ... (... */
- syntax_error_unexpected_ch('(');
- return 1;
- }
- /* it is "word(..." or "word (..." */
- do
- ch = i_getch(input);
- while (ch == ' ' || ch == '\t');
- if (ch != ')') {
- syntax_error_unexpected_ch(ch);
- return 1;
- }
- nommu_addchr(&ctx->as_string, ch);
- do
- ch = i_getch(input);
- while (ch == ' ' || ch == '\t' || ch == '\n');
- if (ch != '{') {
- syntax_error_unexpected_ch(ch);
- return 1;
- }
- nommu_addchr(&ctx->as_string, ch);
- command->cmd_type = CMD_FUNCDEF;
- goto skip;
- }
-#endif
-
-#if 0 /* Prevented by caller */
- if (command->argv /* word [word]{... */
- || dest->length /* word{... */
- || dest->has_quoted_part /* ""{... */
- ) {
- syntax_error(NULL);
- debug_printf_parse("parse_group return 1: "
- "syntax error, groups and arglists don't mix\n");
- return 1;
- }
-#endif
-
-#if ENABLE_HUSH_FUNCTIONS
- skip:
-#endif
- endch = '}';
- if (ch == '(') {
- endch = ')';
- command->cmd_type = CMD_SUBSHELL;
- } else {
- /* bash does not allow "{echo...", requires whitespace */
- ch = i_getch(input);
- if (ch != ' ' && ch != '\t' && ch != '\n') {
- syntax_error_unexpected_ch(ch);
- return 1;
- }
- nommu_addchr(&ctx->as_string, ch);
- }
-
- {
-#if BB_MMU
-# define as_string NULL
-#else
- char *as_string = NULL;
-#endif
- pipe_list = parse_stream(&as_string, input, endch);
-#if !BB_MMU
- if (as_string)
- o_addstr(&ctx->as_string, as_string);
-#endif
- /* empty ()/{} or parse error? */
- if (!pipe_list || pipe_list == ERR_PTR) {
- /* parse_stream already emitted error msg */
- if (!BB_MMU)
- free(as_string);
- debug_printf_parse("parse_group return 1: "
- "parse_stream returned %p\n", pipe_list);
- return 1;
- }
- command->group = pipe_list;
-#if !BB_MMU
- as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
- command->group_as_string = as_string;
- debug_printf_parse("end of group, remembering as:'%s'\n",
- command->group_as_string);
-#endif
-#undef as_string
- }
- debug_printf_parse("parse_group return 0\n");
- return 0;
- /* command remains "open", available for possible redirects */
-}
-
-#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
-/* Subroutines for copying $(...) and `...` things */
-static void add_till_backquote(o_string *dest, struct in_str *input);
-/* '...' */
-static void add_till_single_quote(o_string *dest, struct in_str *input)
-{
- while (1) {
- int ch = i_getch(input);
- if (ch == EOF) {
- syntax_error_unterm_ch('\'');
- /*xfunc_die(); - redundant */
- }
- if (ch == '\'')
- return;
- o_addchr(dest, ch);
- }
-}
-/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
-static void add_till_double_quote(o_string *dest, struct in_str *input)
-{
- while (1) {
- int ch = i_getch(input);
- if (ch == EOF) {
- syntax_error_unterm_ch('"');
- /*xfunc_die(); - redundant */
- }
- if (ch == '"')
- return;
- if (ch == '\\') { /* \x. Copy both chars. */
- o_addchr(dest, ch);
- ch = i_getch(input);
- }
- o_addchr(dest, ch);
- if (ch == '`') {
- add_till_backquote(dest, input);
- o_addchr(dest, ch);
- continue;
- }
- //if (ch == '$') ...
- }
-}
-/* Process `cmd` - copy contents until "`" is seen. Complicated by
- * \` quoting.
- * "Within the backquoted style of command substitution, backslash
- * shall retain its literal meaning, except when followed by: '$', '`', or '\'.
- * The search for the matching backquote shall be satisfied by the first
- * backquote found without a preceding backslash; during this search,
- * if a non-escaped backquote is encountered within a shell comment,
- * a here-document, an embedded command substitution of the $(command)
- * form, or a quoted string, undefined results occur. A single-quoted
- * or double-quoted string that begins, but does not end, within the
- * "`...`" sequence produces undefined results."
- * Example Output
- * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
- */
-static void add_till_backquote(o_string *dest, struct in_str *input)
-{
- while (1) {
- int ch = i_getch(input);
- if (ch == EOF) {
- syntax_error_unterm_ch('`');
- /*xfunc_die(); - redundant */
- }
- if (ch == '`')
- return;
- if (ch == '\\') {
- /* \x. Copy both chars unless it is \` */
- int ch2 = i_getch(input);
- if (ch2 == EOF) {
- syntax_error_unterm_ch('`');
- /*xfunc_die(); - redundant */
- }
- if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
- o_addchr(dest, ch);
- ch = ch2;
- }
- o_addchr(dest, ch);
- }
-}
-/* Process $(cmd) - copy contents until ")" is seen. Complicated by
- * quoting and nested ()s.
- * "With the $(command) style of command substitution, all characters
- * following the open parenthesis to the matching closing parenthesis
- * constitute the command. Any valid shell script can be used for command,
- * except a script consisting solely of redirections which produces
- * unspecified results."
- * Example Output
- * echo $(echo '(TEST)' BEST) (TEST) BEST
- * echo $(echo 'TEST)' BEST) TEST) BEST
- * echo $(echo \(\(TEST\) BEST) ((TEST) BEST
- *
- * Also adapted to eat ${var%...} and $((...)) constructs, since ... part
- * can contain arbitrary constructs, just like $(cmd).
- * In bash compat mode, it needs to also be able to stop on ':' or '/'
- * for ${var:N[:M]} and ${var/P[/R]} parsing.
- */
-#define DOUBLE_CLOSE_CHAR_FLAG 0x80
-static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch)
-{
- int ch;
- char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG;
-# if ENABLE_HUSH_BASH_COMPAT
- char end_char2 = end_ch >> 8;
-# endif
- end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1);
-
- while (1) {
- ch = i_getch(input);
- if (ch == EOF) {
- syntax_error_unterm_ch(end_ch);
- /*xfunc_die(); - redundant */
- }
- if (ch == end_ch IF_HUSH_BASH_COMPAT( || ch == end_char2)) {
- if (!dbl)
- break;
- /* we look for closing )) of $((EXPR)) */
- if (i_peek(input) == end_ch) {
- i_getch(input); /* eat second ')' */
- break;
- }
- }
- o_addchr(dest, ch);
- if (ch == '(' || ch == '{') {
- ch = (ch == '(' ? ')' : '}');
- add_till_closing_bracket(dest, input, ch);
- o_addchr(dest, ch);
- continue;
- }
- if (ch == '\'') {
- add_till_single_quote(dest, input);
- o_addchr(dest, ch);
- continue;
- }
- if (ch == '"') {
- add_till_double_quote(dest, input);
- o_addchr(dest, ch);
- continue;
- }
- if (ch == '`') {
- add_till_backquote(dest, input);
- o_addchr(dest, ch);
- continue;
- }
- if (ch == '\\') {
- /* \x. Copy verbatim. Important for \(, \) */
- ch = i_getch(input);
- if (ch == EOF) {
- syntax_error_unterm_ch(')');
- /*xfunc_die(); - redundant */
- }
- o_addchr(dest, ch);
- continue;
- }
- }
- return ch;
-}
-#endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS */
-
-/* Return code: 0 for OK, 1 for syntax error */
-#if BB_MMU
-#define parse_dollar(as_string, dest, input) \
- parse_dollar(dest, input)
-#define as_string NULL
-#endif
-static int parse_dollar(o_string *as_string,
- o_string *dest,
- struct in_str *input)
-{
- int ch = i_peek(input); /* first character after the $ */
- unsigned char quote_mask = dest->o_escape ? 0x80 : 0;
-
- debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
- if (isalpha(ch)) {
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- make_var:
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- while (1) {
- debug_printf_parse(": '%c'\n", ch);
- o_addchr(dest, ch | quote_mask);
- quote_mask = 0;
- ch = i_peek(input);
- if (!isalnum(ch) && ch != '_')
- break;
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- }
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- } else if (isdigit(ch)) {
- make_one_char_var:
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- debug_printf_parse(": '%c'\n", ch);
- o_addchr(dest, ch | quote_mask);
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- } else switch (ch) {
- case '$': /* pid */
- case '!': /* last bg pid */
- case '?': /* last exit code */
- case '#': /* number of args */
- case '*': /* args */
- case '@': /* args */
- goto make_one_char_var;
- case '{': {
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
-
- ch = i_getch(input); /* eat '{' */
- nommu_addchr(as_string, ch);
-
- ch = i_getch(input); /* first char after '{' */
- nommu_addchr(as_string, ch);
- /* It should be ${?}, or ${#var},
- * or even ${?+subst} - operator acting on a special variable,
- * or the beginning of variable name.
- */
- if (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) { /* not one of those */
- bad_dollar_syntax:
- syntax_error_unterm_str("${name}");
- debug_printf_parse("parse_dollar return 1: unterminated ${name}\n");
- return 1;
- }
- ch |= quote_mask;
-
- /* It's possible to just call add_till_closing_bracket() at this point.
- * However, this regresses some of our testsuite cases
- * which check invalid constructs like ${%}.
- * Oh well... let's check that the var name part is fine... */
-
- while (1) {
- unsigned pos;
-
- o_addchr(dest, ch);
- debug_printf_parse(": '%c'\n", ch);
-
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- if (ch == '}')
- break;
-
- if (!isalnum(ch) && ch != '_') {
- unsigned end_ch;
- unsigned char last_ch;
- /* handle parameter expansions
- * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
- */
- if (!strchr(VAR_SUBST_OPS, ch)) /* ${var<bad_char>... */
- goto bad_dollar_syntax;
-
- /* Eat everything until closing '}' (or ':') */
- end_ch = '}';
- if (ENABLE_HUSH_BASH_COMPAT
- && ch == ':'
- && !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input))
- ) {
- /* It's ${var:N[:M]} thing */
- end_ch = '}' * 0x100 + ':';
- }
- if (ENABLE_HUSH_BASH_COMPAT
- && ch == '/'
- ) {
- /* It's ${var/[/]pattern[/repl]} thing */
- if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */
- i_getch(input);
- nommu_addchr(as_string, '/');
- ch = '\\';
- }
- end_ch = '}' * 0x100 + '/';
- }
- o_addchr(dest, ch);
- again:
- if (!BB_MMU)
- pos = dest->length;
-#if ENABLE_HUSH_DOLLAR_OPS
- last_ch = add_till_closing_bracket(dest, input, end_ch);
-#else
-#error Simple code to only allow ${var} is not implemented
-#endif
- if (as_string) {
- o_addstr(as_string, dest->data + pos);
- o_addchr(as_string, last_ch);
- }
-
- if (ENABLE_HUSH_BASH_COMPAT && (end_ch & 0xff00)) {
- /* close the first block: */
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- /* while parsing N from ${var:N[:M]}
- * or pattern from ${var/[/]pattern[/repl]} */
- if ((end_ch & 0xff) == last_ch) {
- /* got ':' or '/'- parse the rest */
- end_ch = '}';
- goto again;
- }
- /* got '}' */
- if (end_ch == '}' * 0x100 + ':') {
- /* it's ${var:N} - emulate :999999999 */
- o_addstr(dest, "999999999");
- } /* else: it's ${var/[/]pattern} */
- }
- break;
- }
- }
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- break;
- }
-#if ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK
- case '(': {
- unsigned pos;
-
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
-# if ENABLE_SH_MATH_SUPPORT
- if (i_peek(input) == '(') {
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- o_addchr(dest, /*quote_mask |*/ '+');
- if (!BB_MMU)
- pos = dest->length;
- add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG);
- if (as_string) {
- o_addstr(as_string, dest->data + pos);
- o_addchr(as_string, ')');
- o_addchr(as_string, ')');
- }
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- break;
- }
-# endif
-# if ENABLE_HUSH_TICK
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- o_addchr(dest, quote_mask | '`');
- if (!BB_MMU)
- pos = dest->length;
- add_till_closing_bracket(dest, input, ')');
- if (as_string) {
- o_addstr(as_string, dest->data + pos);
- o_addchr(as_string, ')');
- }
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
-# endif
- break;
- }
-#endif
- case '_':
- ch = i_getch(input);
- nommu_addchr(as_string, ch);
- ch = i_peek(input);
- if (isalnum(ch)) { /* it's $_name or $_123 */
- ch = '_';
- goto make_var;
- }
- /* else: it's $_ */
- /* TODO: $_ and $-: */
- /* $_ Shell or shell script name; or last argument of last command
- * (if last command wasn't a pipe; if it was, bash sets $_ to "");
- * but in command's env, set to full pathname used to invoke it */
- /* $- Option flags set by set builtin or shell options (-i etc) */
- default:
- o_addQchr(dest, '$');
- }
- debug_printf_parse("parse_dollar return 0\n");
- return 0;
-#undef as_string
-}
-
-#if BB_MMU
-#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
- parse_stream_dquoted(dest, input, dquote_end)
-#define as_string NULL
-#endif
-static int parse_stream_dquoted(o_string *as_string,
- o_string *dest,
- struct in_str *input,
- int dquote_end)
-{
- int ch;
- int next;
-
- again:
- ch = i_getch(input);
- if (ch != EOF)
- nommu_addchr(as_string, ch);
- if (ch == dquote_end) { /* may be only '"' or EOF */
- if (dest->o_assignment == NOT_ASSIGNMENT)
- dest->o_escape ^= 1;
- debug_printf_parse("parse_stream_dquoted return 0\n");
- return 0;
- }
- /* note: can't move it above ch == dquote_end check! */
- if (ch == EOF) {
- syntax_error_unterm_ch('"');
- /*xfunc_die(); - redundant */
- }
- next = '\0';
- if (ch != '\n') {
- next = i_peek(input);
- }
- debug_printf_parse("\" ch=%c (%d) escape=%d\n",
- ch, ch, dest->o_escape);
- if (ch == '\\') {
- if (next == EOF) {
- syntax_error("\\<eof>");
- xfunc_die();
- }
- /* bash:
- * "The backslash retains its special meaning [in "..."]
- * only when followed by one of the following characters:
- * $, `, ", \, or <newline>. A double quote may be quoted
- * within double quotes by preceding it with a backslash."
- */
- if (strchr("$`\"\\\n", next) != NULL) {
- ch = i_getch(input);
- if (ch != '\n') {
- o_addqchr(dest, ch);
- nommu_addchr(as_string, ch);
- }
- } else {
- o_addqchr(dest, '\\');
- nommu_addchr(as_string, '\\');
- }
- goto again;
- }
- if (ch == '$') {
- if (parse_dollar(as_string, dest, input) != 0) {
- debug_printf_parse("parse_stream_dquoted return 1: "
- "parse_dollar returned non-0\n");
- return 1;
- }
- goto again;
- }
-#if ENABLE_HUSH_TICK
- if (ch == '`') {
- //unsigned pos = dest->length;
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- o_addchr(dest, 0x80 | '`');
- add_till_backquote(dest, input);
- o_addchr(dest, SPECIAL_VAR_SYMBOL);
- //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
- goto again;
- }
-#endif
- o_addQchr(dest, ch);
- if (ch == '='
- && (dest->o_assignment == MAYBE_ASSIGNMENT
- || dest->o_assignment == WORD_IS_KEYWORD)
- && is_well_formed_var_name(dest->data, '=')
- ) {
- dest->o_assignment = DEFINITELY_ASSIGNMENT;
- }
- goto again;
-#undef as_string
-}
-
-/*
- * Scan input until EOF or end_trigger char.
- * Return a list of pipes to execute, or NULL on EOF
- * or if end_trigger character is met.
- * On syntax error, exit is shell is not interactive,
- * reset parsing machinery and start parsing anew,
- * or return ERR_PTR.
- */
-static struct pipe *parse_stream(char **pstring,
- struct in_str *input,
- int end_trigger)
-{
- struct parse_context ctx;
- o_string dest = NULL_O_STRING;
- int is_in_dquote;
- int heredoc_cnt;
-
- /* Double-quote state is handled in the state variable is_in_dquote.
- * A single-quote triggers a bypass of the main loop until its mate is
- * found. When recursing, quote state is passed in via dest->o_escape.
- */
- debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
- end_trigger ? end_trigger : 'X');
- debug_enter();
-
- /* If very first arg is "" or '', dest.data may end up NULL.
- * Preventing this: */
- o_addchr(&dest, '\0');
- dest.length = 0;
-
- G.ifs = get_local_var_value("IFS");
- if (G.ifs == NULL)
- G.ifs = defifs;
-
- reset:
-#if ENABLE_HUSH_INTERACTIVE
- input->promptmode = 0; /* PS1 */
-#endif
- /* dest.o_assignment = MAYBE_ASSIGNMENT; - already is */
- initialize_context(&ctx);
- is_in_dquote = 0;
- heredoc_cnt = 0;
- while (1) {
- const char *is_ifs;
- const char *is_special;
- int ch;
- int next;
- int redir_fd;
- redir_type redir_style;
-
- if (is_in_dquote) {
- /* dest.has_quoted_part = 1; - already is (see below) */
- if (parse_stream_dquoted(&ctx.as_string, &dest, input, '"')) {
- goto parse_error;
- }
- /* We reached closing '"' */
- is_in_dquote = 0;
- }
- ch = i_getch(input);
- debug_printf_parse(": ch=%c (%d) escape=%d\n",
- ch, ch, dest.o_escape);
- if (ch == EOF) {
- struct pipe *pi;
-
- if (heredoc_cnt) {
- syntax_error_unterm_str("here document");
- goto parse_error;
- }
- /* end_trigger == '}' case errors out earlier,
- * checking only ')' */
- if (end_trigger == ')') {
- syntax_error_unterm_ch('('); /* exits */
- /* goto parse_error; */
- }
-
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- o_free(&dest);
- done_pipe(&ctx, PIPE_SEQ);
- pi = ctx.list_head;
- /* If we got nothing... */
- /* (this makes bare "&" cmd a no-op.
- * bash says: "syntax error near unexpected token '&'") */
- if (pi->num_cmds == 0
- IF_HAS_KEYWORDS( && pi->res_word == RES_NONE)
- ) {
- free_pipe_list(pi);
- pi = NULL;
- }
-#if !BB_MMU
- debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
- if (pstring)
- *pstring = ctx.as_string.data;
- else
- o_free_unsafe(&ctx.as_string);
-#endif
- debug_leave();
- debug_printf_parse("parse_stream return %p\n", pi);
- return pi;
- }
- nommu_addchr(&ctx.as_string, ch);
-
- next = '\0';
- if (ch != '\n')
- next = i_peek(input);
-
- is_special = "{}<>;&|()#'" /* special outside of "str" */
- "\\$\"" IF_HUSH_TICK("`"); /* always special */
- /* Are { and } special here? */
- if (ctx.command->argv /* word [word]{... - non-special */
- || dest.length /* word{... - non-special */
- || dest.has_quoted_part /* ""{... - non-special */
- || (next != ';' /* }; - special */
- && next != ')' /* }) - special */
- && next != '&' /* }& and }&& ... - special */
- && next != '|' /* }|| ... - special */
- && !strchr(G.ifs, next) /* {word - non-special */
- )
- ) {
- /* They are not special, skip "{}" */
- is_special += 2;
- }
- is_special = strchr(is_special, ch);
- is_ifs = strchr(G.ifs, ch);
-
- if (!is_special && !is_ifs) { /* ordinary char */
- ordinary_char:
- o_addQchr(&dest, ch);
- if ((dest.o_assignment == MAYBE_ASSIGNMENT
- || dest.o_assignment == WORD_IS_KEYWORD)
- && ch == '='
- && is_well_formed_var_name(dest.data, '=')
- ) {
- dest.o_assignment = DEFINITELY_ASSIGNMENT;
- }
- continue;
- }
-
- if (is_ifs) {
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- if (ch == '\n') {
-#if ENABLE_HUSH_CASE
- /* "case ... in <newline> word) ..." -
- * newlines are ignored (but ';' wouldn't be) */
- if (ctx.command->argv == NULL
- && ctx.ctx_res_w == RES_MATCH
- ) {
- continue;
- }
-#endif
- /* Treat newline as a command separator. */
- done_pipe(&ctx, PIPE_SEQ);
- debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
- if (heredoc_cnt) {
- if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
- goto parse_error;
- }
- heredoc_cnt = 0;
- }
- dest.o_assignment = MAYBE_ASSIGNMENT;
- ch = ';';
- /* note: if (is_ifs) continue;
- * will still trigger for us */
- }
- }
-
- /* "cmd}" or "cmd }..." without semicolon or &:
- * } is an ordinary char in this case, even inside { cmd; }
- * Pathological example: { ""}; } should exec "}" cmd
- */
- if (ch == '}') {
- if (!IS_NULL_CMD(ctx.command) /* cmd } */
- || dest.length != 0 /* word} */
- || dest.has_quoted_part /* ""} */
- ) {
- goto ordinary_char;
- }
- if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
- goto skip_end_trigger;
- /* else: } does terminate a group */
- }
-
- if (end_trigger && end_trigger == ch
- && (ch != ';' || heredoc_cnt == 0)
-#if ENABLE_HUSH_CASE
- && (ch != ')'
- || ctx.ctx_res_w != RES_MATCH
- || (!dest.has_quoted_part && strcmp(dest.data, "esac") == 0)
- )
-#endif
- ) {
- if (heredoc_cnt) {
- /* This is technically valid:
- * { cat <<HERE; }; echo Ok
- * heredoc
- * heredoc
- * HERE
- * but we don't support this.
- * We require heredoc to be in enclosing {}/(),
- * if any.
- */
- syntax_error_unterm_str("here document");
- goto parse_error;
- }
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- done_pipe(&ctx, PIPE_SEQ);
- dest.o_assignment = MAYBE_ASSIGNMENT;
- /* Do we sit outside of any if's, loops or case's? */
- if (!HAS_KEYWORDS
- IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
- ) {
- o_free(&dest);
-#if !BB_MMU
- debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
- if (pstring)
- *pstring = ctx.as_string.data;
- else
- o_free_unsafe(&ctx.as_string);
-#endif
- debug_leave();
- debug_printf_parse("parse_stream return %p: "
- "end_trigger char found\n",
- ctx.list_head);
- return ctx.list_head;
- }
- }
- skip_end_trigger:
- if (is_ifs)
- continue;
-
- /* Catch <, > before deciding whether this word is
- * an assignment. a=1 2>z b=2: b=2 is still assignment */
- switch (ch) {
- case '>':
- redir_fd = redirect_opt_num(&dest);
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- redir_style = REDIRECT_OVERWRITE;
- if (next == '>') {
- redir_style = REDIRECT_APPEND;
- ch = i_getch(input);
- nommu_addchr(&ctx.as_string, ch);
- }
-#if 0
- else if (next == '(') {
- syntax_error(">(process) not supported");
- goto parse_error;
- }
-#endif
- if (parse_redirect(&ctx, redir_fd, redir_style, input))
- goto parse_error;
- continue; /* back to top of while (1) */
- case '<':
- redir_fd = redirect_opt_num(&dest);
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- redir_style = REDIRECT_INPUT;
- if (next == '<') {
- redir_style = REDIRECT_HEREDOC;
- heredoc_cnt++;
- debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
- ch = i_getch(input);
- nommu_addchr(&ctx.as_string, ch);
- } else if (next == '>') {
- redir_style = REDIRECT_IO;
- ch = i_getch(input);
- nommu_addchr(&ctx.as_string, ch);
- }
-#if 0
- else if (next == '(') {
- syntax_error("<(process) not supported");
- goto parse_error;
- }
-#endif
- if (parse_redirect(&ctx, redir_fd, redir_style, input))
- goto parse_error;
- continue; /* back to top of while (1) */
- }
-
- if (dest.o_assignment == MAYBE_ASSIGNMENT
- /* check that we are not in word in "a=1 2>word b=1": */
- && !ctx.pending_redirect
- ) {
- /* ch is a special char and thus this word
- * cannot be an assignment */
- dest.o_assignment = NOT_ASSIGNMENT;
- }
-
- /* Note: nommu_addchr(&ctx.as_string, ch) is already done */
-
- switch (ch) {
- case '#':
- if (dest.length == 0) {
- while (1) {
- ch = i_peek(input);
- if (ch == EOF || ch == '\n')
- break;
- i_getch(input);
- /* note: we do not add it to &ctx.as_string */
- }
- nommu_addchr(&ctx.as_string, '\n');
- } else {
- o_addQchr(&dest, ch);
- }
- break;
- case '\\':
- if (next == EOF) {
- syntax_error("\\<eof>");
- xfunc_die();
- }
- ch = i_getch(input);
- if (ch != '\n') {
- o_addchr(&dest, '\\');
- /*nommu_addchr(&ctx.as_string, '\\'); - already done */
- o_addchr(&dest, ch);
- nommu_addchr(&ctx.as_string, ch);
- /* Example: echo Hello \2>file
- * we need to know that word 2 is quoted */
- dest.has_quoted_part = 1;
- }
-#if !BB_MMU
- else {
- /* It's "\<newline>". Remove trailing '\' from ctx.as_string */
- ctx.as_string.data[--ctx.as_string.length] = '\0';
- }
-#endif
- break;
- case '$':
- if (parse_dollar(&ctx.as_string, &dest, input) != 0) {
- debug_printf_parse("parse_stream parse error: "
- "parse_dollar returned non-0\n");
- goto parse_error;
- }
- break;
- case '\'':
- dest.has_quoted_part = 1;
- while (1) {
- ch = i_getch(input);
- if (ch == EOF) {
- syntax_error_unterm_ch('\'');
- /*xfunc_die(); - redundant */
- }
- nommu_addchr(&ctx.as_string, ch);
- if (ch == '\'')
- break;
- o_addqchr(&dest, ch);
- }
- break;
- case '"':
- dest.has_quoted_part = 1;
- is_in_dquote ^= 1; /* invert */
- if (dest.o_assignment == NOT_ASSIGNMENT)
- dest.o_escape ^= 1;
- break;
-#if ENABLE_HUSH_TICK
- case '`': {
- unsigned pos;
-
- o_addchr(&dest, SPECIAL_VAR_SYMBOL);
- o_addchr(&dest, '`');
- pos = dest.length;
- add_till_backquote(&dest, input);
-# if !BB_MMU
- o_addstr(&ctx.as_string, dest.data + pos);
- o_addchr(&ctx.as_string, '`');
-# endif
- o_addchr(&dest, SPECIAL_VAR_SYMBOL);
- //debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
- break;
- }
-#endif
- case ';':
-#if ENABLE_HUSH_CASE
- case_semi:
-#endif
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- done_pipe(&ctx, PIPE_SEQ);
-#if ENABLE_HUSH_CASE
- /* Eat multiple semicolons, detect
- * whether it means something special */
- while (1) {
- ch = i_peek(input);
- if (ch != ';')
- break;
- ch = i_getch(input);
- nommu_addchr(&ctx.as_string, ch);
- if (ctx.ctx_res_w == RES_CASE_BODY) {
- ctx.ctx_dsemicolon = 1;
- ctx.ctx_res_w = RES_MATCH;
- break;
- }
- }
-#endif
- new_cmd:
- /* We just finished a cmd. New one may start
- * with an assignment */
- dest.o_assignment = MAYBE_ASSIGNMENT;
- break;
- case '&':
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
- if (next == '&') {
- ch = i_getch(input);
- nommu_addchr(&ctx.as_string, ch);
- done_pipe(&ctx, PIPE_AND);
- } else {
- done_pipe(&ctx, PIPE_BG);
- }
- goto new_cmd;
- case '|':
- if (done_word(&dest, &ctx)) {
- goto parse_error;
- }
-#if ENABLE_HUSH_CASE
- if (ctx.ctx_res_w == RES_MATCH)
- break; /* we are in case's "word | word)" */
-#endif
- if (next == '|') { /* || */
- ch = i_getch(input);
- nommu_addchr(&ctx.as_string, ch);
- done_pipe(&ctx, PIPE_OR);
- } else {
- /* we could pick up a file descriptor choice here
- * with redirect_opt_num(), but bash doesn't do it.
- * "echo foo 2| cat" yields "foo 2". */
- done_command(&ctx);
-#if !BB_MMU
- o_reset_to_empty_unquoted(&ctx.as_string);
-#endif
- }
- goto new_cmd;
- case '(':
-#if ENABLE_HUSH_CASE
- /* "case... in [(]word)..." - skip '(' */
- if (ctx.ctx_res_w == RES_MATCH
- && ctx.command->argv == NULL /* not (word|(... */
- && dest.length == 0 /* not word(... */
- && dest.has_quoted_part == 0 /* not ""(... */
- ) {
- continue;
- }
-#endif
- case '{':
- if (parse_group(&dest, &ctx, input, ch) != 0) {
- goto parse_error;
- }
- goto new_cmd;
- case ')':
-#if ENABLE_HUSH_CASE
- if (ctx.ctx_res_w == RES_MATCH)
- goto case_semi;
-#endif
- case '}':
- /* proper use of this character is caught by end_trigger:
- * if we see {, we call parse_group(..., end_trigger='}')
- * and it will match } earlier (not here). */
- syntax_error_unexpected_ch(ch);
- goto parse_error;
- default:
- if (HUSH_DEBUG)
- bb_error_msg_and_die("BUG: unexpected %c\n", ch);
- }
- } /* while (1) */
-
- parse_error:
- {
- struct parse_context *pctx;
- IF_HAS_KEYWORDS(struct parse_context *p2;)
-
- /* Clean up allocated tree.
- * Sample for finding leaks on syntax error recovery path.
- * Run it from interactive shell, watch pmap `pidof hush`.
- * while if false; then false; fi; do break; fi
- * Samples to catch leaks at execution:
- * while if (true | {true;}); then echo ok; fi; do break; done
- * while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
- */
- pctx = &ctx;
- do {
- /* Update pipe/command counts,
- * otherwise freeing may miss some */
- done_pipe(pctx, PIPE_SEQ);
- debug_printf_clean("freeing list %p from ctx %p\n",
- pctx->list_head, pctx);
- debug_print_tree(pctx->list_head, 0);
- free_pipe_list(pctx->list_head);
- debug_printf_clean("freed list %p\n", pctx->list_head);
-#if !BB_MMU
- o_free_unsafe(&pctx->as_string);
-#endif
- IF_HAS_KEYWORDS(p2 = pctx->stack;)
- if (pctx != &ctx) {
- free(pctx);
- }
- IF_HAS_KEYWORDS(pctx = p2;)
- } while (HAS_KEYWORDS && pctx);
- /* Free text, clear all dest fields */
- o_free(&dest);
- /* If we are not in top-level parse, we return,
- * our caller will propagate error.
- */
- if (end_trigger != ';') {
-#if !BB_MMU
- if (pstring)
- *pstring = NULL;
-#endif
- debug_leave();
- return ERR_PTR;
- }
- /* Discard cached input, force prompt */
- input->p = NULL;
- IF_HUSH_INTERACTIVE(input->promptme = 1;)
- goto reset;
- }
-}
-
-/* Executing from string: eval, sh -c '...'
- * or from file: /etc/profile, . file, sh <script>, sh (intereactive)
- * end_trigger controls how often we stop parsing
- * NUL: parse all, execute, return
- * ';': parse till ';' or newline, execute, repeat till EOF
- */
-static void parse_and_run_stream(struct in_str *inp, int end_trigger)
-{
- /* Why we need empty flag?
- * An obscure corner case "false; ``; echo $?":
- * empty command in `` should still set $? to 0.
- * But we can't just set $? to 0 at the start,
- * this breaks "false; echo `echo $?`" case.
- */
- bool empty = 1;
- while (1) {
- struct pipe *pipe_list;
-
- pipe_list = parse_stream(NULL, inp, end_trigger);
- if (!pipe_list) { /* EOF */
- if (empty)
- G.last_exitcode = 0;
- break;
- }
- debug_print_tree(pipe_list, 0);
- debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
- run_and_free_list(pipe_list);
- empty = 0;
- }
-}
-
-static void parse_and_run_string(const char *s)
-{
- struct in_str input;
- setup_string_in_str(&input, s);
- parse_and_run_stream(&input, '\0');
-}
-
-static void parse_and_run_file(FILE *f)
-{
- struct in_str input;
- setup_file_in_str(&input, f);
- parse_and_run_stream(&input, ';');
-}
-
/* Called a few times only (or even once if "sh -c") */
static void init_sigmasks(void)
{