1 // RUN: %clang_cc1 -fsyntax-only -verify -Wformat-nonliteral -pedantic %s
2 
3 #include <stdarg.h>
4 
5 extern "C" {
6 extern int scanf(const char *restrict, ...);
7 extern int printf(const char *restrict, ...);
8 extern int vprintf(const char *restrict, va_list);
9 }
10 
11 void f(char **sp, float *fp) {
12   scanf("%as", sp); // expected-warning{{'a' is a non-standard length modifier}}
13 
14   // TODO: Warn that the 'a' conversion specifier is a C++11 feature.
15   printf("%a", 1.0);
16   scanf("%afoobar", fp);
17 }
18 
19 void g() {
20   printf("%ls", "foo"); // expected-warning{{format specifies type 'wchar_t *' but the argument has type 'const char *'}}
21 }
22 
23 // Test that we properly handle format_idx on C++ members.
24 class Foo {
25 public:
26   const char *gettext(const char *fmt) __attribute__((format_arg(2)));
27 
28   int scanf(const char *, ...) __attribute__((format(scanf, 2, 3)));
29   int printf(const char *, ...) __attribute__((format(printf, 2, 3)));
30   int printf2(const char *, ...);
31 
32   static const char *gettext_static(const char *fmt) __attribute__((format_arg(1)));
33   static int printf_static(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
34 };
35 
36 void h(int *i) {
37   Foo foo;
38   foo.scanf("%d"); // expected-warning{{more '%' conversions than data arguments}}
39   foo.printf("%d", i); // expected-warning{{format specifies type 'int' but the argument has type 'int *'}}
40   Foo::printf_static("%d", i); // expected-warning{{format specifies type 'int' but the argument has type 'int *'}}
41 
42   printf(foo.gettext("%d"), i); // expected-warning{{format specifies type 'int' but the argument has type 'int *'}}
43   printf(Foo::gettext_static("%d"), i); // expected-warning{{format specifies type 'int' but the argument has type 'int *'}}
44 }
45 
46 // Test handling __null for format string literal checking.
47 extern "C" {
48   int test_null_format(const char *format, ...) __attribute__((__format__ (__printf__, 1, 2)));
49 }
50 
51 void rdar8269537(const char *f)
52 {
53   test_null_format(false); // expected-warning {{null from a constant boolean}}
54   test_null_format(0); // no-warning
55   test_null_format(__null); // no-warning
56   test_null_format(f); // expected-warning {{not a string literal}}
57 }
58 
59 int Foo::printf(const char *fmt, ...) {
60   va_list ap;
61   va_start(ap,fmt);
62   const char * const format = fmt;
63   vprintf(format, ap); // no-warning
64 
65   const char *format2 = fmt;
66   vprintf(format2, ap); // expected-warning{{format string is not a string literal}}
67 
68   return 0;
69 }
70 
71 int Foo::printf2(const char *fmt, ...) {
72   va_list ap;
73   va_start(ap,fmt);
74   vprintf(fmt, ap); // expected-warning{{format string is not a string literal}}
75 
76   return 0;
77 }
78