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-rw-r--r--shell/hush.c43
1 files changed, 23 insertions, 20 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 942e72a..f49a39b 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -4335,7 +4335,7 @@ static struct pipe *parse_stream(char **pstring,
/*** Execution routines ***/
/* Expansion can recurse, need forward decls: */
-static char *expand_string_to_string(const char *str);
+static char *expand_string_to_string(const char *str, int do_unbackslash);
static int process_command_subs(o_string *dest, const char *s);
/* expand_strvec_to_strvec() takes a list of strings, expands
@@ -4387,7 +4387,7 @@ static int expand_on_ifs(o_string *output, int n, const char *str)
* Returns malloced string.
* As an optimization, we return NULL if expansion is not needed.
*/
-static char *expand_pseudo_dquoted(const char *str, int dquoted)
+static char *expand_pseudo_dquoted(const char *str, int dquoted, int do_unbackslash)
{
char *exp_str;
struct in_str input;
@@ -4408,7 +4408,7 @@ static char *expand_pseudo_dquoted(const char *str, int dquoted)
setup_string_in_str(&input, str);
parse_stream_dquoted(NULL, &dest, &input, EOF, dquoted);
//bb_error_msg("'%s' -> '%s'", str, dest.data);
- exp_str = expand_string_to_string(dest.data);
+ exp_str = expand_string_to_string(dest.data, /*unbackslash:*/ do_unbackslash);
//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
o_free_unsafe(&dest);
return exp_str;
@@ -4424,7 +4424,7 @@ static arith_t expand_and_evaluate_arith(const char *arg, int *errcode_p)
hooks.lookupvar = get_local_var_value;
hooks.setvar = set_local_var_from_halves;
//hooks.endofname = endofname;
- exp_str = expand_pseudo_dquoted(arg, /*dquoted:*/ 1);
+ exp_str = expand_pseudo_dquoted(arg, /*dquoted:*/ 1, /*unbackslash:*/ 1);
res = arith(exp_str ? exp_str : arg, errcode_p, &hooks);
free(exp_str);
return res;
@@ -4594,8 +4594,7 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha
//TODO: avoid xstrdup unless needed
// (see HACK ALERT below for an example)
val = to_be_freed = xstrdup(val);
-//TODO: fix expansion rules:
- exp_exp_word = expand_pseudo_dquoted(exp_word, /*dquoted:*/ 1);
+ exp_exp_word = expand_pseudo_dquoted(exp_word, /*dquoted:*/ 1, /*unbackslash:*/ 1);
if (exp_exp_word)
exp_word = exp_exp_word;
loc = scan_and_match(to_be_freed, exp_word, scan_flags);
@@ -4631,9 +4630,8 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha
* v='a bz'; echo ${v/a*z/\z} prints "z"
* (note that a*z _pattern_ is never globbed!)
*/
-//TODO: fix expansion rules:
char *pattern, *repl, *t;
- pattern = expand_pseudo_dquoted(exp_word, /*dquoted:*/ 1);
+ pattern = expand_pseudo_dquoted(exp_word, /*dquoted:*/ 0, /*unbackslash:*/ 0);
if (!pattern)
pattern = xstrdup(exp_word);
debug_printf_varexp("pattern:'%s'->'%s'\n", exp_word, pattern);
@@ -4641,7 +4639,7 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha
exp_word = p;
p = strchr(p, SPECIAL_VAR_SYMBOL);
*p = '\0';
- repl = expand_pseudo_dquoted(exp_word, /*dquoted:*/ arg0 & 0x80);
+ repl = expand_pseudo_dquoted(exp_word, /*dquoted:*/ arg0 & 0x80, /*unbackslash:*/ 1);
debug_printf_varexp("repl:'%s'->'%s'\n", exp_word, repl);
/* HACK ALERT. We depend here on the fact that
* G.global_argv and results of utoa and get_local_var_value
@@ -4726,7 +4724,7 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha
debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
(exp_save == ':') ? "true" : "false", use_word);
if (use_word) {
- to_be_freed = expand_pseudo_dquoted(exp_word, /*dquoted:*/ 1);
+ to_be_freed = expand_pseudo_dquoted(exp_word, /*dquoted:*/ 1, /*unbackslash:*/ 1);
if (to_be_freed)
exp_word = to_be_freed;
if (exp_op == '?') {
@@ -4998,30 +4996,35 @@ static char **expand_strvec_to_strvec_singleword_noglob(char **argv)
* NB: should NOT do globbing!
* "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*"
*/
-static char *expand_string_to_string(const char *str)
+static char *expand_string_to_string(const char *str, int do_unbackslash)
{
char *argv[2], **list;
+ debug_printf_expand("string_to_string<='%s'\n", str);
/* This is generally an optimization, but it also
* handles "", which otherwise trips over !list[0] check below.
* (is this ever happens that we actually get str="" here?)
*/
if (!strchr(str, SPECIAL_VAR_SYMBOL) && !strchr(str, '\\')) {
//TODO: Can use on strings with \ too, just unbackslash() them?
- debug_printf_expand("string_to_string(fast)='%s'\n", str);
+ debug_printf_expand("string_to_string(fast)=>'%s'\n", str);
return xstrdup(str);
}
argv[0] = (char*)str;
argv[1] = NULL;
- list = expand_variables(argv, EXP_FLAG_ESC_GLOB_CHARS | EXP_FLAG_SINGLEWORD);
+ list = expand_variables(argv, do_unbackslash
+ ? EXP_FLAG_ESC_GLOB_CHARS | EXP_FLAG_SINGLEWORD
+ : EXP_FLAG_SINGLEWORD
+ );
if (HUSH_DEBUG)
if (!list[0] || list[1])
bb_error_msg_and_die("BUG in varexp2");
/* actually, just move string 2*sizeof(char*) bytes back */
overlapping_strcpy((char*)list, list[0]);
- unbackslash((char*)list);
- debug_printf_expand("string_to_string='%s'\n", (char*)list);
+ if (do_unbackslash)
+ unbackslash((char*)list);
+ debug_printf_expand("string_to_string=>'%s'\n", (char*)list);
return (char*)list;
}
@@ -5056,7 +5059,7 @@ static char **expand_assignments(char **argv, int count)
G.expanded_assignments = p = NULL;
/* Expand assignments into one string each */
for (i = 0; i < count; i++) {
- G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i]));
+ G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i], /*unbackslash:*/ 1));
}
G.expanded_assignments = NULL;
return p;
@@ -5465,7 +5468,7 @@ static void setup_heredoc(struct redir_struct *redir)
expanded = NULL;
if (!(redir->rd_dup & HEREDOC_QUOTED)) {
- expanded = expand_pseudo_dquoted(heredoc, /*dquoted:*/ 1);
+ expanded = expand_pseudo_dquoted(heredoc, /*dquoted:*/ 1, /*unbackslash:*/ 1);
if (expanded)
heredoc = expanded;
}
@@ -5565,7 +5568,7 @@ static int setup_redirects(struct command *prog, int squirrel[])
continue;
}
mode = redir_table[redir->rd_type].mode;
- p = expand_string_to_string(redir->rd_filename);
+ p = expand_string_to_string(redir->rd_filename, /*unbackslash:*/ 1);
openfd = open_or_warn(p, mode);
free(p);
if (openfd < 0) {
@@ -6516,7 +6519,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
if (G_x_mode)
bb_putchar_stderr('+');
while (*argv) {
- char *p = expand_string_to_string(*argv);
+ char *p = expand_string_to_string(*argv, /*unbackslash:*/ 1);
if (G_x_mode)
fprintf(stderr, " %s", p);
debug_printf_exec("set shell var:'%s'->'%s'\n",
@@ -7020,7 +7023,7 @@ static int run_list(struct pipe *pi)
/* all prev words didn't match, does this one match? */
argv = pi->cmds->argv;
while (*argv) {
- char *pattern = expand_string_to_string(*argv);
+ char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 1);
/* TODO: which FNM_xxx flags to use? */
cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
free(pattern);
generated by cgit v1.1 at 2024-12-29 11:48:05 +0000