[PATCH 11/22] lockfile: define a constant LOCK_SUFFIX_LEN

[Michael Haggerty <mhagger@alum.mit.edu>]

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 lockfile.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lockfile.c b/lockfile.c
index 4a9ceda..4e3ada8 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -178,14 +178,17 @@ static char *resolve_symlink(char *p, size_t s)
 	return p;
 }
 
+/* We append ".lock" to the filename to derive the lockfile name: */
+#define LOCK_SUFFIX_LEN 5
 
 static int lock_file(struct lock_file *lk, const char *path, int flags)
 {
 	/*
-	 * subtract 5 from size to make sure there's room for adding
-	 * ".lock" for the lock file name
+	 * subtract LOCK_SUFFIX_LEN from size to make sure there's
+	 * room for adding ".lock" for the lock file name:
 	 */
-	static const size_t max_path_len = sizeof(lk->filename) - 5;
+	static const size_t max_path_len = sizeof(lk->filename) -
+		                           LOCK_SUFFIX_LEN;
 
 	if (!lock_file_list) {
 		/* One-time initialization */
@@ -301,7 +304,7 @@ int commit_lock_file(struct lock_file *lk)
 	if (lk->fd >= 0 && close_lock_file(lk))
 		return -1;
 	strcpy(result_file, lk->filename);
-	i = strlen(result_file) - 5; /* .lock */
+	i = strlen(result_file) - LOCK_SUFFIX_LEN; /* .lock */
 	result_file[i] = 0;
 	if (rename(lk->filename, result_file))
 		return -1;
-- 
1.9.0