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optimize get_current_dir_name to reduce stack bloat

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our getcwd already (as an extension) supports allocation of a buffer
when the buffer argument is a null pointer, so there's no need to
duplicate the allocation logic in this wrapper function. duplicating
it is actually harmful in that it doubles the stack usage from
PATH_MAX to 2*PATH_MAX.
This commit is contained in:
Rich Felker 2013-12-13 02:25:09 -05:00
parent a7dbcf5c8c
commit 2b7cf6dbb9
1 changed files with 1 additions and 3 deletions
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4
src/misc/get_current_dir_name.c
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@ -7,11 +7,9 @@
char *get_current_dir_name(void) {
struct stat a, b;
char buf[PATH_MAX];
char *res = getenv("PWD");
if (res && *res && !stat(res, &a) && !stat(".", &b)
&& (a.st_dev == b.st_dev) && (a.st_ino == b.st_ino))
return strdup(res);
if(!getcwd(buf, sizeof(buf))) return NULL;
return strdup(buf);
return getcwd(0, 0);
}