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authorRich Felker <dalias@aerifal.cx>2013-12-13 02:25:09 -0500
committerRich Felker <dalias@aerifal.cx>2013-12-13 02:25:09 -0500
commit2b7cf6dbb9d56c5fac8f673e7c9d06c81d312af5 (patch)
treedc8df5dcdb658cc1b08f89f0e228dd9609eb0fa3 /src/misc
parenta7dbcf5c8ca7edb7a46eb276031ad1df4131135b (diff)
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optimize get_current_dir_name to reduce stack bloat
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.
Diffstat (limited to 'src/misc')
-rw-r--r--src/misc/get_current_dir_name.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/src/misc/get_current_dir_name.c b/src/misc/get_current_dir_name.c
index 8576df2c..782cddcd 100644
--- a/src/misc/get_current_dir_name.c
+++ b/src/misc/get_current_dir_name.c
@@ -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);
 }