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hush: fix set [--] params. Closes bug 199.

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function                                             old     new   delta
builtin_set                                           55     194    +139
add_strings_to_strings                                 -     130    +130
add_string_to_strings                                110      26     -84
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 269/-84)           Total: 185 bytes
This commit is contained in:
Denis Vlasenko 2009-03-20 10:13:08 +00:00
parent 1bb3d7e450
commit 11fb7cf5af
1 changed files with 61 additions and 9 deletions
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70
shell/hush.c
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@ -471,8 +471,9 @@ struct globals {
smallint fake_mode;
/* these three support $?, $#, and $1 */
smalluint last_return_code;
smalluint global_args_malloced;
int global_argc; /* NB: $# + 1 */
char **global_argv;
int global_argc;
#if ENABLE_HUSH_LOOPS
unsigned depth_break_continue;
unsigned depth_of_loop;
@ -646,7 +647,7 @@ static char *unbackslash(char *src)
return dst;
}
static char **add_strings_to_strings(char **strings, char **add)
static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
{
int i;
unsigned count1;
@ -671,7 +672,7 @@ static char **add_strings_to_strings(char **strings, char **add)
v[count1 + count2] = NULL;
i = count2;
while (--i >= 0)
v[count1 + i] = add[i];
v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
return v;
}
@ -680,7 +681,7 @@ static char **add_string_to_strings(char **strings, char *add)
char *v[2];
v[0] = add;
v[1] = NULL;
return add_strings_to_strings(strings, v);
return add_strings_to_strings(strings, v, /*dup:*/ 0);
}
static void putenv_all(char **strings)
@ -4644,17 +4645,68 @@ static int builtin_read(char **argv)
return set_local_var(string, 0);
}
/* built-in 'set [VAR=value]' handler */
/* built-in 'set' handler
* SUSv3 says:
* set [-abCefmnuvx] [-h] [-o option] [argument...]
* set [+abCefmnuvx] [+h] [+o option] [argument...]
* set -- [argument...]
* set -o
* set +o
* Implementations shall support the options in both their hyphen and
* plus-sign forms. These options can also be specified as options to sh.
* Examples:
* Write out all variables and their values: set
* Set $1, $2, and $3 and set "$#" to 3: set c a b
* Turn on the -x and -v options: set -xv
* Unset all positional parameters: set --
* Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
* Set the positional parameters to the expansion of x, even if x expands
* with a leading '-' or '+': set -- $x
*
* So far, we only support "set -- [argument...]" by ignoring all options
* (also, "-o option" will be mishandled by taking "option" as parameter #1).
*/
static int builtin_set(char **argv)
{
char *temp = argv[1];
struct variable *e;
char **pp;
char *arg = *++argv;
if (temp == NULL)
if (arg == NULL) {
for (e = G.top_var; e; e = e->next)
puts(e->varstr);
else
set_local_var(xstrdup(temp), 0);
} else {
/* NB: G.global_argv[0] ($0) is never freed/changed */
if (G.global_args_malloced) {
pp = G.global_argv;
while (*++pp)
free(*pp);
G.global_argv[1] = NULL;
} else {
G.global_args_malloced = 1;
pp = xzalloc(sizeof(pp[0]) * 2);
pp[0] = G.global_argv[0]; /* retain $0 */
G.global_argv = pp;
}
do {
if (arg[0] == '+')
continue;
if (arg[0] != '-')
break;
if (arg[1] == '-' && arg[2] == '\0') {
argv++;
break;
}
} while ((arg = *++argv) != NULL);
/* Now argv[0] is 1st argument */
/* This realloc's G.global_argv */
G.global_argv = pp = add_strings_to_strings(G.global_argv, argv, /*dup:*/ 1);
G.global_argc = 1;
while (*++pp)
G.global_argc++;
}
return EXIT_SUCCESS;
}