Move short-lived realpath buffers to the stack

There is little reason here to grab 4K from the heap only to return it a
few lines later. Instead, just use the stack to hold the returned value
saving ourselves the malloc/free cycle.

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

2 files changed, 2 insertions, 6 deletions

diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c
index 85429029..5714932c 100644
--- a/lib/libalpm/conflict.c
+++ b/lib/libalpm/conflict.c
@@ -547,7 +547,7 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
 			 * consideration cannot itself be a link, as it might be unowned- path
 			 * components can be safely checked as all directories are "unowned". */
 			if(!resolved_conflict && dbpkg && !S_ISLNK(lsbuf.st_mode)) {
-				char *rpath = calloc(PATH_MAX, sizeof(char));
+				char rpath[PATH_MAX];
 				if(realpath(path, rpath)) {
 					const char *relative_rpath = rpath + rootlen;
 					if(_alpm_filelist_contains(alpm_pkg_get_files(dbpkg), relative_rpath)) {
@@ -556,7 +556,6 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
 						resolved_conflict = 1;
 					}
 				}
-				free(rpath);
 			}
 
 			/* is the file unowned and in the backup list of the new package? */
diff --git a/lib/libalpm/handle.c b/lib/libalpm/handle.c
index 2db27fbf..816162bd 100644
--- a/lib/libalpm/handle.c
+++ b/lib/libalpm/handle.c
@@ -333,7 +333,7 @@ alpm_errno_t _alpm_set_directory_option(const char *value,
 		char **storage, int must_exist)
  {
 	struct stat st;
-	char *real = NULL;
+	char real[PATH_MAX];
 	const char *path;
 
 	path = value;
@@ -344,9 +344,7 @@ alpm_errno_t _alpm_set_directory_option(const char *value,
 		if(stat(path, &st) == -1 || !S_ISDIR(st.st_mode)) {
 			return ALPM_ERR_NOT_A_DIR;
 		}
-		CALLOC(real, PATH_MAX, sizeof(char), return ALPM_ERR_MEMORY);
 		if(!realpath(path, real)) {
-			free(real);
 			return ALPM_ERR_NOT_A_DIR;
 		}
 		path = real;
@@ -359,7 +357,6 @@ alpm_errno_t _alpm_set_directory_option(const char *value,
 	if(!*storage) {
 		return ALPM_ERR_MEMORY;
 	}
-	free(real);
 	return 0;
 }