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which: fix TODO with NOFORK+malloc_failure misbehaving

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function                                             old     new   delta
find_executable                                       86     104     +18
which_main                                           202     194      -8
executable_exists                                     66      51     -15
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 18/-23)             Total: -5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-01-12 13:21:33 +01:00
parent 3bb3e1d0a1
commit cca7c611f2
4 changed files with 28 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

18
libbb/executable.c
View file

@ -25,7 +25,8 @@ int FAST_FUNC file_is_executable(const char *name)
* you may call find_executable again with this PATHp to continue
* (if it's not NULL).
* return NULL otherwise; (PATHp is undefined)
* in all cases (*PATHp) contents will be trashed (s/:/NUL/).
* in all cases (*PATHp) contents are temporarily modified
* but are restored on return (s/:/NUL/ and back).
*/
char* FAST_FUNC find_executable(const char *filename, char **PATHp)
{
@ -41,14 +42,17 @@ char* FAST_FUNC find_executable(const char *filename, char **PATHp)
p = *PATHp;
while (p) {
int ex;
n = strchr(p, ':');
if (n)
*n++ = '\0';
if (n) *n = '\0';
p = concat_path_file(
p[0] ? p : ".", /* handle "::" case */
filename
);
if (file_is_executable(p)) {
ex = file_is_executable(p);
if (n) *n++ = ':';
if (ex) {
*PATHp = n;
return p;
}
@ -64,10 +68,8 @@ char* FAST_FUNC find_executable(const char *filename, char **PATHp)
*/
int FAST_FUNC executable_exists(const char *filename)
{
char *path = xstrdup(getenv("PATH"));
char *tmp = path;
char *ret = find_executable(filename, &tmp);
free(path);
char *path = getenv("PATH");
char *ret = find_executable(filename, &path);
free(ret);
return ret != NULL;
}