[PATCH] Fix mkpath abuse in dwim_ref and dwim_log of sha1_name.c

[Alex Riesen <raa.lkml@gmail.com>]

Otherwise the function sometimes fail to resolve obviously correct
refnames, because the string data pointed to by "str" argument were
reused.

The change in dwim_log does not fix anything, just optimizes away
strcpy code as the path can be created directly in the available
buffer.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
---

Was noticed in cygwin port, which somehow (supposedly by excessive
calling of git_config from lstat stub setup) managed to reuse the
just returned buffer.

 sha1_name.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sha1_name.c b/sha1_name.c
index 41b6809..159c2ab 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -245,11 +245,13 @@ int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
 
 	*ref = NULL;
 	for (p = ref_rev_parse_rules; *p; p++) {
+		char fullref[PATH_MAX];
 		unsigned char sha1_from_ref[20];
 		unsigned char *this_result;
 
 		this_result = refs_found ? sha1_from_ref : sha1;
-		r = resolve_ref(mkpath(*p, len, str), this_result, 1, NULL);
+		mksnpath(fullref, sizeof(fullref), *p, len, str);
+		r = resolve_ref(fullref, this_result, 1, NULL);
 		if (r) {
 			if (!refs_found++)
 				*ref = xstrdup(r);
@@ -272,7 +274,7 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
 		char path[PATH_MAX];
 		const char *ref, *it;
 
-		strcpy(path, mkpath(*p, len, str));
+		mksnpath(path, sizeof(path), *p, len, str);
 		ref = resolve_ref(path, hash, 1, NULL);
 		if (!ref)
 			continue;
-- 
1.6.0.3.540.g3f8b