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-rw-r--r--src/common/util.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/common/util.h b/src/common/util.h
index 567efaafef..36601fa790 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -213,7 +213,11 @@ const char *escaped(const char *string);
struct smartlist_t;
void wrap_string(struct smartlist_t *out, const char *string, size_t width,
const char *prefix0, const char *prefixRest);
-int tor_vsscanf(const char *buf, const char *pattern, va_list ap);
+int tor_vsscanf(const char *buf, const char *pattern, va_list ap)
+#ifdef __GNUC__
+ __attribute__((format(scanf, 2, 0)))
+#endif
+ ;
int tor_sscanf(const char *buf, const char *pattern, ...)
#ifdef __GNUC__
__attribute__((format(scanf, 2, 3)))