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>

3 files changed, 5 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index ac9276b..5cfdb4f 100644
--- a/cache.h
+++ b/cache.h
@@ -32,2 +32,3 @@ extern int cache_ls(const char *path);
 /* Print a message to stdout */
+__attribute__((format (printf,1,2)))
 extern void cache_log(const char *format, ...);
diff --git a/cgit.h b/cgit.h
index 4090cd4..8f84281 100644
--- a/cgit.h
+++ b/cgit.h
@@ -295,2 +295,3 @@ extern void cgit_diff_commit(struct commit *commit, filepair_fn fn);
 
+__attribute__((format (printf,1,2)))
 extern char *fmt(const char *format,...);
diff --git a/html.h b/html.h
index 16d55ec..1135fb8 100644
--- a/html.h
+++ b/html.h
@@ -7,3 +7,6 @@ extern void html_raw(const char *txt, size_t size);
 extern void html(const char *txt);
+
+__attribute__((format (printf,1,2)))
 extern void htmlf(const char *format,...);
+
 extern void html_status(int code, const char *msg, int more_headers);