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-rw-r--r--shell/hush.c125
1 files changed, 103 insertions, 22 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 0313cfd..13e9623 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1055,13 +1055,18 @@ static const char *get_local_var_value(const char *src)
/* str holds "NAME=VAL" and is expected to be malloced.
* We take ownership of it.
- * flg_export is used by:
+ * flg_export:
* 0: do not export
* 1: export
* -1: if NAME is set, leave export status alone
* if NAME is not set, do not export
+ * flg_read_only is set only when we handle -R var=val
*/
-static int set_local_var(char *str, int flg_export)
+#if BB_MMU
+#define set_local_var(str, flg_export, flg_read_only) \
+ set_local_var(str, flg_export)
+#endif
+static int set_local_var(char *str, int flg_export, int flg_read_only)
{
struct variable *cur;
char *value;
@@ -1088,7 +1093,10 @@ static int set_local_var(char *str, int flg_export)
/* We found an existing var with this name */
*value = '\0';
if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", str);
+#if !BB_MMU
+ if (!flg_read_only)
+#endif
+ bb_error_msg("%s: readonly variable", str);
free(str);
return -1;
}
@@ -1119,6 +1127,7 @@ static int set_local_var(char *str, int flg_export)
set_str_and_exp:
cur->varstr = str;
+ cur->flg_read_only = flg_read_only;
exp:
if (flg_export == 1)
cur->flg_export = 1;
@@ -1182,7 +1191,7 @@ static void arith_set_local_var(const char *name, const char *val, int flags)
{
/* arith code doesnt malloc space, so do it for it */
char *var = xasprintf("%s=%s", name, val);
- set_local_var(var, flags);
+ set_local_var(var, flags, 0);
}
#endif
@@ -1948,7 +1957,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
} else {
char *new_var = xmalloc(strlen(var) + strlen(val) + 2);
sprintf(new_var, "%s=%s", var, val);
- set_local_var(new_var, -1);
+ set_local_var(new_var, -1, 0);
}
}
}
@@ -2332,9 +2341,40 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
static void re_execute_shell(const char *s) NORETURN;
static void re_execute_shell(const char *s)
{
-//TODO: pass non-exported variables, traps, and functions
- debug_printf_exec("re_execute_shell pid:%d cmd:'%s'", getpid(), s);
- execl(bb_busybox_exec_path, "hush", "-c", s, NULL);
+ struct variable *cur;
+ char **argv, **pp;
+ unsigned cnt;
+
+ /* hush -$<pid> -?<exitcode> ... -c <cmd> NULL */
+ cnt = 6;
+ for (cur = G.top_var; cur; cur = cur->next) {
+ if (!cur->flg_export || cur->flg_read_only)
+ cnt += 2;
+ }
+//TODO: need to free these strings in parent!
+ argv = pp = xmalloc(sizeof(argv[0]) * cnt);
+ *pp++ = (char *) applet_name;
+ *pp++ = xasprintf("-$%u", G.root_pid);
+ *pp++ = xasprintf("-?%u", G.last_return_code);
+ for (cur = G.top_var; cur; cur = cur->next) {
+ if (cur->varstr == hush_version_str)
+ continue;
+ if (cur->flg_read_only) {
+ *pp++ = (char *) "-R";
+ *pp++ = cur->varstr;
+ } else if (!cur->flg_export) {
+ *pp++ = (char *) "-V";
+ *pp++ = cur->varstr;
+ }
+ }
+ *pp++ = (char *) "-c";
+ *pp++ = (char *) s;
+//TODO: pass $N
+ *pp = NULL;
+//TODO: pass traps and functions
+
+ debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
+ execv(bb_busybox_exec_path, argv);
//TODO: fallback for init=/bin/hush?
_exit(127);
}
@@ -2720,7 +2760,7 @@ static int run_pipe(struct pipe *pi)
p = expand_string_to_string(*argv);
debug_printf_exec("set shell var:'%s'->'%s'\n",
*argv, p);
- set_local_var(p, 0);
+ set_local_var(p, 0, 0);
argv++;
}
/* Do we need to flag set_local_var() errors?
@@ -4094,7 +4134,7 @@ static int handle_dollar(struct parse_context *ctx,
if (isalpha(ch)) {
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
make_var:
o_addchr(dest, SPECIAL_VAR_SYMBOL);
@@ -4107,7 +4147,7 @@ static int handle_dollar(struct parse_context *ctx,
break;
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
}
o_addchr(dest, SPECIAL_VAR_SYMBOL);
@@ -4115,7 +4155,7 @@ static int handle_dollar(struct parse_context *ctx,
make_one_char_var:
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
o_addchr(dest, SPECIAL_VAR_SYMBOL);
debug_printf_parse(": '%c'\n", ch);
@@ -4135,7 +4175,7 @@ static int handle_dollar(struct parse_context *ctx,
o_addchr(dest, SPECIAL_VAR_SYMBOL);
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
/* XXX maybe someone will try to escape the '}' */
expansion = 0;
@@ -4144,7 +4184,7 @@ static int handle_dollar(struct parse_context *ctx,
while (1) {
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
if (ch == '}')
break;
@@ -4211,19 +4251,32 @@ static int handle_dollar(struct parse_context *ctx,
break;
}
case '(': {
+#if !BB_MMU
+ int pos;
+#endif
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
#if ENABLE_SH_MATH_SUPPORT
if (i_peek(input) == '(') {
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
o_addchr(dest, SPECIAL_VAR_SYMBOL);
o_addchr(dest, /*quote_mask |*/ '+');
+#if !BB_MMU
+ pos = dest->length;
+#endif
add_till_closing_paren(dest, input, true);
+#if !BB_MMU
+ if (ctx) {
+ o_addstr(&ctx->as_string, dest->data + pos);
+ o_addchr(&ctx->as_string, ')');
+ o_addchr(&ctx->as_string, ')');
+ }
+#endif
o_addchr(dest, SPECIAL_VAR_SYMBOL);
break;
}
@@ -4232,7 +4285,16 @@ static int handle_dollar(struct parse_context *ctx,
//int pos = dest->length;
o_addchr(dest, SPECIAL_VAR_SYMBOL);
o_addchr(dest, quote_mask | '`');
+#if !BB_MMU
+ pos = dest->length;
+#endif
add_till_closing_paren(dest, input, false);
+#if !BB_MMU
+ if (ctx) {
+ o_addstr(&ctx->as_string, dest->data + pos);
+ o_addchr(&ctx->as_string, '`');
+ }
+#endif
//debug_printf_subst("SUBST RES2 '%s'\n", dest->data + pos);
o_addchr(dest, SPECIAL_VAR_SYMBOL);
#endif
@@ -4241,7 +4303,7 @@ static int handle_dollar(struct parse_context *ctx,
case '_':
ch = i_getch(input);
#if !BB_MMU
- o_addchr(&ctx->as_string, ch);
+ if (ctx) o_addchr(&ctx->as_string, ch);
#endif
ch = i_peek(input);
if (isalnum(ch)) { /* it's $_name or $_123 */
@@ -4293,8 +4355,8 @@ static int parse_stream_dquoted(struct parse_context *ctx,
if (ch != '\n') {
next = i_peek(input);
}
- debug_printf_parse(": ch=%c (%d) m=%d escape=%d\n",
- ch, ch, m, dest->o_escape);
+ debug_printf_parse(": ch=%c (%d) escape=%d\n",
+ ch, ch, dest->o_escape);
if (ch == '\\') {
if (next == EOF) {
syntax("\\<eof>");
@@ -4944,7 +5006,14 @@ int hush_main(int argc, char **argv)
input = stdin;
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
- while ((opt = getopt(argc, argv, "c:xins")) > 0) {
+ while (1) {
+ opt = getopt(argc, argv, "c:xins"
+#if !BB_MMU
+ "$:?:R:V:"
+#endif
+ );
+ if (opt <= 0)
+ break;
switch (opt) {
case 'c':
G.global_argv = argv + optind;
@@ -4965,6 +5034,18 @@ int hush_main(int argc, char **argv)
/* "-s" means "read from stdin", but this is how we always
* operate, so simply do nothing here. */
break;
+#if !BB_MMU
+ case '$':
+ G.root_pid = xatoi_u(optarg);
+ break;
+ case '?':
+ G.last_return_code = xatoi_u(optarg);
+ break;
+ case 'R':
+ case 'V':
+ set_local_var(xstrdup(optarg), 0, opt == 'R');
+ break;
+#endif
case 'n':
case 'x':
if (!set_mode('-', opt))
@@ -5293,7 +5374,7 @@ static int builtin_export(char **argv)
return EXIT_SUCCESS;
}
- set_local_var(xstrdup(name), 1);
+ set_local_var(xstrdup(name), 1, 0);
return EXIT_SUCCESS;
}
@@ -5406,7 +5487,7 @@ static int builtin_read(char **argv)
const char *name = argv[1] ? argv[1] : "REPLY";
string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL);
- return set_local_var(string, 0);
+ return set_local_var(string, 0, 0);
}
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
generated by cgit v1.1 at 2024-11-01 05:34:45 +0000