Change resolve_symlink() to take a strbuf rather than a string as
parameter. This simplifies the code and removes an arbitrary pathname
length restriction. It also means that lock_file's filename field no
longer needs to be initialized to a large size.
Helped-by: Torsten Bögershausen <tboegi@xxxxxx>
Signed-off-by: Michael Haggerty <mhagger@xxxxxxxxxxxx>
---
lockfile.c | 57 ++++++++++++++++++++++-----------------------------------
1 file changed, 22 insertions(+), 35 deletions(-)
diff --git a/lockfile.c b/lockfile.c
index cc9b9cb..5f5bcff 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -109,58 +109,47 @@ static char *last_path_elm(char *p)
#define MAXDEPTH 5
/*
- * p = path that may be a symlink
- * s = full size of p
+ * path contains a path that might be a symlink.
*
- * If p is a symlink, attempt to overwrite p with a path to the real
- * file or directory (which may or may not exist), following a chain of
- * symlinks if necessary. Otherwise, leave p unmodified.
+ * If path is a symlink, attempt to overwrite it with a path to the
+ * real file or directory (which may or may not exist), following a
+ * chain of symlinks if necessary. Otherwise, leave path unmodified.
*
- * This is a best-effort routine. If an error occurs, p will either be
- * left unmodified or will name a different symlink in a symlink chain
- * that started with p's initial contents.
- *
- * Always returns p.
+ * This is a best-effort routine. If an error occurs, path will
+ * either be left unmodified or will name a different symlink in a
+ * symlink chain that started with the original path.
*/
-
-static char *resolve_symlink(char *p, size_t s)
+static void resolve_symlink(struct strbuf *path)
{
int depth = MAXDEPTH;
static struct strbuf link = STRBUF_INIT;
while (depth--) {
- if (strbuf_readlink(&link, p, strlen(p)) < 0)
+ if (strbuf_readlink(&link, path->buf, path->len) < 0)
break;
- if (is_absolute_path(link.buf)) {
+ if (is_absolute_path(link.buf))
/* absolute path simply replaces p */
- if (link.len < s)
- strcpy(p, link.buf);
- else {
- warning("%s: symlink too long", p);
- break;
- }
- } else {
+ strbuf_reset(path);
+ else {
/*
* link is a relative path, so replace the
* last element of p with it.
*/
- char *r = (char *)last_path_elm(p);
- if (r - p + link.len < s)
- strcpy(r, link.buf);
- else {
- warning("%s: symlink too long", p);
- break;
- }
+ char *r = last_path_elm(path->buf);
+ strbuf_setlen(path, r - path->buf);
}
+
+ strbuf_addbuf(path, &link);
}
strbuf_reset(&link);
- return p;
}
/* Make sure errno contains a meaningful value on error */
static int lock_file(struct lock_file *lk, const char *path, int flags)
{
+ size_t pathlen = strlen(path);
+
if (!lock_file_list) {
/* One-time initialization */
sigchain_push_common(remove_lock_file_on_signal);
@@ -175,7 +164,7 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
lk->fd = -1;
lk->active = 0;
lk->owner = 0;
- strbuf_init(&lk->filename, PATH_MAX);
+ strbuf_init(&lk->filename, pathlen + LOCK_SUFFIX_LEN);
lk->next = lock_file_list;
lock_file_list = lk;
lk->on_list = 1;
@@ -185,11 +174,9 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
path);
}
- strbuf_addstr(&lk->filename, path);
- if (!(flags & LOCK_NODEREF)) {
- resolve_symlink(lk->filename.buf, lk->filename.alloc);
- strbuf_setlen(&lk->filename, strlen(lk->filename.buf));
- }
+ strbuf_add(&lk->filename, path, pathlen);
+ if (!(flags & LOCK_NODEREF))
+ resolve_symlink(&lk->filename);
strbuf_addstr(&lk->filename, LOCK_SUFFIX);
lk->fd = open(lk->filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666);
if (lk->fd < 0) {
--
2.1.0
--
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