use __attribute__ to catch printf format mistakes

Use "__attribute__((format (printf,N,M)))", as is done in git, do catch
mistakes in printf-style format strings.

Signed-off-by: Mark Lodato <lodatom@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index ac9276b..5cfdb4f 100644
--- a/cache.h
+++ b/cache.h
@@ -1,37 +1,38 @@
 /*
  * Since git has it's own cache.h which we include,
  * lets test on CGIT_CACHE_H to avoid confusion
  */
 
 #ifndef CGIT_CACHE_H
 #define CGIT_CACHE_H
 
 typedef void (*cache_fill_fn)(void *cbdata);
 
 
 /* Print cached content to stdout, generate the content if necessary.
  *
  * Parameters
  *   size    max number of cache files
  *   path    directory used to store cache files
  *   key     the key used to lookup cache files
  *   ttl     max cache time in seconds for this key
  *   fn      content generator function for this key
  *   cbdata  user-supplied data to the content generator function
  *
  * Return value
  *   0 indicates success, everyting else is an error
  */
 extern int cache_process(int size, const char *path, const char *key, int ttl,
 			 cache_fill_fn fn, void *cbdata);
 
 
 /* List info about all cache entries on stdout */
 extern int cache_ls(const char *path);
 
 /* Print a message to stdout */
+__attribute__((format (printf,1,2)))
 extern void cache_log(const char *format, ...);
 
 extern unsigned long hash_str(const char *str);
 
 #endif /* CGIT_CACHE_H */