commit_lock_file(): use a strbuf to manage temporary space

Avoid relying on the filename length restrictions that are currently
checked by lock_file().

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/lockfile.c b/lockfile.c
index 89043f5acc6c455e04d9c51ac26d244128d5e12b..1dd118f5566b9f29c840e528b020383964abe87e 100644 (file)
--- a/lockfile.c
+++ b/lockfile.c
@@ -319,7 +319,8 @@ int reopen_lock_file(struct lock_file *lk)
 
 int commit_lock_file(struct lock_file *lk)
 {
-       char result_file[PATH_MAX];
+       static struct strbuf result_file = STRBUF_INIT;
+       int err;
 
        if (!lk->active)
                die("BUG: attempt to commit unlocked object");
@@ -327,11 +328,12 @@ int commit_lock_file(struct lock_file *lk)
        if (close_lock_file(lk))
                return -1;
 
-       strcpy(result_file, lk->filename);
        /* remove ".lock": */
-       result_file[strlen(result_file) - LOCK_SUFFIX_LEN] = 0;
-
-       if (rename(lk->filename, result_file)) {
+       strbuf_add(&result_file, lk->filename,
+                  strlen(lk->filename) - LOCK_SUFFIX_LEN);
+       err = rename(lk->filename, result_file.buf);
+       strbuf_reset(&result_file);
+       if (err) {
                int save_errno = errno;
                rollback_lock_file(lk);
                errno = save_errno;