1// RUN: %clang_cc1 -fsyntax-only -verify -Wformat-nonliteral -pedantic -fblocks %s
2
3#include <stdarg.h>
4
5extern "C" {
6extern int scanf(const char *restrict, ...);
7extern int printf(const char *restrict, ...);
8extern int vprintf(const char *restrict, va_list);
9}
10
11void f(char **sp, float *fp) {
12  scanf("%as", sp); // expected-warning{{'a' length modifier is not supported by ISO C}}
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
19void 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.
24class Foo {
25public:
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
36void 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.
47extern "C" {
48  int test_null_format(const char *format, ...) __attribute__((__format__ (__printf__, 1, 2)));
49}
50
51void 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
59int 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
71int 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
79
80namespace Templates {
81  template<typename T>
82  void my_uninstantiated_print(const T &arg) {
83    printf("%d", arg); // no-warning
84  }
85
86  template<typename T>
87  void my_print(const T &arg) {
88    printf("%d", arg); // expected-warning {{format specifies type 'int' but the argument has type 'const char *'}}
89  }
90
91  void use_my_print() {
92    my_print("abc"); // expected-note {{requested here}}
93  }
94
95
96  template<typename T>
97  class UninstantiatedPrinter {
98  public:
99    static void print(const T &arg) {
100      printf("%d", arg); // no-warning
101    }
102  };
103
104  template<typename T>
105  class Printer {
106    void format(const char *fmt, ...) __attribute__((format(printf,2,3)));
107  public:
108
109    void print(const T &arg) {
110      format("%d", arg); // expected-warning {{format specifies type 'int' but the argument has type 'const char *'}}
111    }
112  };
113
114  void use_class(Printer<const char *> &p) {
115    p.print("abc"); // expected-note {{requested here}}
116  }
117
118
119  extern void (^block_print)(const char * format, ...) __attribute__((format(printf, 1, 2)));
120
121  template<typename T>
122  void uninstantiated_call_block_print(const T &arg) {
123    block_print("%d", arg); // no-warning
124  }
125
126  template<typename T>
127  void call_block_print(const T &arg) {
128    block_print("%d", arg); // expected-warning {{format specifies type 'int' but the argument has type 'const char *'}}
129  }
130
131  void use_block_print() {
132    call_block_print("abc"); // expected-note {{requested here}}
133  }
134}
135
136