Use access() instead of stat() when possible

We were using the stat() system call in quite a few places when we didn't
actually need anything the stat struct returned- we were simply checking for
file existence. access() will be more efficient in those cases.

Before (strace pacman -Ss pacman):
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 33.16    0.005987           0     19016           stat64

After:
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 34.85    0.003863           0     12633         1 access
  7.95    0.000881           0      6391         7 stat64

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/src/pacman/util.c b/src/pacman/util.c
index e702886b..d7ac9e38 100644
--- a/src/pacman/util.c
+++ b/src/pacman/util.c
@@ -22,7 +22,6 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/time.h>
-#include <sys/stat.h>
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -125,7 +124,7 @@ int makepath(const char *path)
 	 * orig - a copy of path so we can safely butcher it with strsep
 	 * str - the current position in the path string (after the delimiter)
 	 * ptr - the original position of str after calling strsep
-	 * incr - incrementally generated path for use in stat/mkdir call
+	 * incr - incrementally generated path for use in access/mkdir call
 	 */
 	char *orig, *str, *ptr, *incr;
 	mode_t oldmask = umask(0000);
@@ -136,12 +135,11 @@ int makepath(const char *path)
 	str = orig;
 	while((ptr = strsep(&str, "/"))) {
 		if(strlen(ptr)) {
-			struct stat buf;
 			/* we have another path component- append the newest component to
 			 * existing string and create one more level of dir structure */
 			strcat(incr, "/");
 			strcat(incr, ptr);
-			if(stat(incr, &buf)) {
+			if(access(incr, F_OK)) {
 				if(mkdir(incr, 0755)) {
 					ret = 1;
 					break;