Hookup checking for invalid length modifiers in scanf format strings.

llvm-svn: 108907

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/test/Sema/format-strings-scanf.c b/clang/test/Sema/format-strings-scanf.c
index 68552b3e241..42b6c03ffbf 100644
--- a/clang/test/Sema/format-strings-scanf.c
+++ b/clang/test/Sema/format-strings-scanf.c
@@ -2,6 +2,7 @@
 
 typedef __typeof(sizeof(int)) size_t;
 typedef struct _FILE FILE;
+typedef __WCHAR_TYPE__ wchar_t;
 
 int fscanf(FILE * restrict, const char * restrict, ...) ;
 int scanf(const char * restrict, ...) ;
@@ -24,3 +25,10 @@ void test(const char *s, int *i) {
   scanf("%*d", i); // // expected-warning{{data argument not used by format string}}
   scanf("%*d%1$d", i); // no-warning
 }
+
+void bad_length_modifiers(char *s, void *p, wchar_t *ws, long double *ld) {
+  scanf("%hhs", "foo"); // expected-warning{{length modifier 'hh' results in undefined behavior or no effect with 's' conversion specifier}}
+  scanf("%1$zp", p); // expected-warning{{length modifier 'z' results in undefined behavior or no effect with 'p' conversion specifier}}
+  scanf("%ls", ws); // no-warning
+  scanf("%#.2Lf", ld); // expected-warning{{invalid conversion specifier '#'}}
+}