diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 55 |
1 files changed, 35 insertions, 20 deletions
diff --git a/shell/hush.c b/shell/hush.c index 61b6a79..8dda988 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -319,6 +319,10 @@ struct command { */ struct redir_struct *redirects; /* I/O redirections */ }; +/* Is there anything in this command at all? */ +#define IS_NULL_CMD(cmd) \ + (!(cmd)->group && !(cmd)->argv && !(cmd)->redirects) + struct pipe { struct pipe *next; @@ -341,6 +345,9 @@ typedef enum pipe_style { PIPE_OR = 3, PIPE_BG = 4, } pipe_style; +/* Is there anything in this pipe at all? */ +#define IS_NULL_PIPE(pi) \ + ((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE)) /* This holds pointers to the various results of parsing */ struct parse_context { @@ -3971,8 +3978,10 @@ static struct pipe *new_pipe(void) return pi; } -/* Command (member of a pipe) is complete. The only possible error here - * is out of memory, in which case xmalloc exits. */ +/* 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 @@ -3981,13 +3990,9 @@ static int done_command(struct parse_context *ctx) struct command *command = ctx->command; if (command) { - if (command->group == NULL - && command->argv == NULL - && command->redirects == NULL - ) { + if (IS_NULL_CMD(command)) { debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds); - memset(command, 0, sizeof(*command)); /* paranoia */ - return pi->num_cmds; + goto clear_and_ret; } pi->num_cmds++; debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds); @@ -3999,12 +4004,9 @@ static int done_command(struct parse_context *ctx) /* 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)); - command = &pi->cmds[pi->num_cmds]; + ctx->command = command = &pi->cmds[pi->num_cmds]; + clear_and_ret: memset(command, 0, sizeof(*command)); - - ctx->command = command; - /* but ctx->pipe and ctx->list_head remain unchanged */ - return pi->num_cmds; /* used only for 0/nonzero check */ } @@ -4024,9 +4026,7 @@ static void done_pipe(struct parse_context *ctx, pipe_style type) /* 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. - * RES_NONE case is for "for a in; do ..." (empty IN set) - * and other cases to work. */ + * IOW: it is safe to do it unconditionally. */ if (not_null #if ENABLE_HUSH_IF || ctx->ctx_res_w == RES_FI @@ -4048,7 +4048,7 @@ static void done_pipe(struct parse_context *ctx, pipe_style type) ctx->pipe->next = new_p; ctx->pipe = new_p; /* RES_THEN, RES_DO etc are "sticky" - - * they remain set for commands inside if/while. + * 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): @@ -4304,7 +4304,7 @@ static int done_word(o_string *word, struct parse_context *ctx) && ctx->ctx_res_w != RES_IN # endif ) { - debug_printf_parse(": checking '%s' for reserved-ness\n", word->data); + 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", @@ -4775,6 +4775,14 @@ static int parse_group(o_string *dest, struct parse_context *ctx, if (ch == '(') { endch = ')'; command->grp_type = GRP_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); } { @@ -5352,13 +5360,11 @@ static struct pipe *parse_stream(char **pstring, if (end_trigger && end_trigger == ch && (heredoc_cnt == 0 || end_trigger != ';') ) { -//TODO: disallow "{ cmd }" without semicolon if (heredoc_cnt) { /* This is technically valid: * { cat <<HERE; }; echo Ok * heredoc * heredoc - * heredoc * HERE * but we don't support this. * We require heredoc to be in enclosing {}/(), @@ -5370,6 +5376,15 @@ static struct pipe *parse_stream(char **pstring, if (done_word(&dest, &ctx)) { goto parse_error; } + /* Disallow "{ cmd }" without semicolon or & */ + //debug_printf_parse("null pi %d\n", IS_NULL_PIPE(ctx.pipe)) + //debug_printf_parse("null cmd %d\n", IS_NULL_CMD(ctx.command)) + if (ch == '}' + && !(IS_NULL_PIPE(ctx.pipe) && IS_NULL_CMD(ctx.command)) + ) { + syntax_error_unexpected_ch(ch); + 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? */ |