src/common.h: Add comment about return value of read_file_contents().

diff --git a/src/common.h b/src/common.h
index 229f709..c292abf 100644 (file)
--- a/src/common.h
+++ b/src/common.h
@@ -283,6 +283,7 @@ typedef int (*dirwalk_callback_f)(const char *dirname, const char *filename,
                void *user_data);
 int walk_directory (const char *dir, dirwalk_callback_f callback,
                void *user_data, int hidden);
+/* Returns the number of bytes read or negative on error. */
 int read_file_contents (const char *filename, char *buf, int bufsize);
 
 counter_t counter_diff (counter_t old_value, counter_t new_value);