clang/test/Sema/attr-format.c

   1 //RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 #include <stdarg.h>
   4
   5 void a(const char *a, ...) __attribute__((format(printf, 1, 2)));    // no-error
   6 void b(const char *a, ...) __attribute__((format(printf, 1, 1)));    // expected-error {{'format' attribute parameter 3 is out of bounds}}
   7 void c(const char *a, ...) __attribute__((format(printf, 0, 2)));    // expected-error {{'format' attribute parameter 2 is out of bounds}}
   8 void d(const char *a, int c) __attribute__((format(printf, 1, 2)));  // expected-warning {{GCC requires a function with the 'format' attribute to be variadic}}
   9 void e(char *str, int c, ...) __attribute__((format(printf, 2, 3))); // expected-error {{format argument not a string type}}
  10 void f(int a, const char *b, ...) __attribute__((format(printf, 2, 1))); // expected-error {{'format' attribute parameter 3 is out of bounds}}
  11 void g(int a, const char *b, ...) __attribute__((format(printf, 2, 2))); // expected-error {{'format' attribute parameter 3 is out of bounds}}
  12 void h(int a, const char *b, ...) __attribute__((format(printf, 2, 3))); // no-error
  13 void i(const char *a, int b, ...) __attribute__((format(printf, 1, 2))); // expected-error {{'format' attribute parameter 3 is out of bounds}}
  14
  15 typedef const char *xpto;
  16 void j(xpto c, va_list list) __attribute__((format(printf, 1, 0))); // no-error
  17 void k(xpto c) __attribute__((format(printf, 1, 0)));               // no-error
  18
  19 void y(char *str) __attribute__((format(strftime, 1, 0)));             // no-error
  20 void z(char *str, int c, ...) __attribute__((format(strftime, 1, 2))); // expected-error {{strftime format attribute requires 3rd parameter to be 0}}
  21
  22 int (*f_ptr)(char*,...) __attribute__((format(printf, 1,2))); // no-error
  23 int (*f2_ptr)(double,...) __attribute__((format(printf, 1, 2))); // expected-error {{format argument not a string type}}
  24
  25 struct _mystruct {
  26   int (*printf)(const char *format, ...) __attribute__((__format__(printf, 1, 2))); // no-error
  27   int (*printf2)(double format, ...) __attribute__((__format__(printf, 1, 2))); // expected-error {{format argument not a string type}}
  28 };
  29
  30 typedef int (*f3_ptr)(char*,...) __attribute__((format(printf,1,0))); // no-error
  31
  32 // <rdar://problem/6623513>
  33 int rdar6623513(void *, const char*, const char*, ...)
  34   __attribute__ ((format (printf, 3, 0)));
  35
  36 int rdar6623513_aux(int len, const char* s) {
  37   rdar6623513(0, "hello", "%.*s", len, s);
  38 }
  39
  40 // same as format(printf(...))...
  41 void a2(const char *a, ...) __attribute__((format(printf0, 1, 2)));    // no-error
  42 void b2(const char *a, ...) __attribute__((format(printf0, 1, 1)));    // expected-error {{'format' attribute parameter 3 is out of bounds}}
  43 void c2(const char *a, ...) __attribute__((format(printf0, 0, 2)));    // expected-error {{'format' attribute parameter 2 is out of bounds}}
  44 void d2(const char *a, int c) __attribute__((format(printf0, 1, 2)));  // expected-warning {{GCC requires a function with the 'format' attribute to be variadic}}
  45 void e2(char *str, int c, ...) __attribute__((format(printf0, 2, 3))); // expected-error {{format argument not a string type}}
  46
  47 // FreeBSD usage
  48 #define __printf0like(fmt, va) __attribute__((__format__(__printf0__, fmt, va)))
  49 void null(int i, const char *a, ...) __printf0like(2, 0); // no-error
  50 void null(int i, const char *a, ...) {                    // expected-note{{passing argument to parameter 'a' here}}
  51   if (a)
  52     (void)0/* vprintf(...) would go here */;
  53 }
  54
  55 void callnull(void){
  56   null(0,        0); // no error
  57   null(0, (char*)0); // no error
  58   null(0, (void*)0); // no error
  59   null(0,  (int*)0); // expected-warning {{incompatible pointer types}}
  60 }
  61
  62 // FreeBSD kernel extensions
  63 void a3(const char *a, ...) __attribute__((format(freebsd_kprintf, 1, 2)));    // no-error
  64 void b3(const char *a, ...) __attribute__((format(freebsd_kprintf, 1, 1)));    // expected-error {{'format' attribute parameter 3 is out of bounds}}
  65 void c3(const char *a, ...) __attribute__((format(freebsd_kprintf, 0, 2)));    // expected-error {{'format' attribute parameter 2 is out of bounds}}
  66 void d3(const char *a, int c) __attribute__((format(freebsd_kprintf, 1, 2)));  // expected-warning {{GCC requires a function with the 'format' attribute to be variadic}}
  67 void e3(char *str, int c, ...) __attribute__((format(freebsd_kprintf, 2, 3))); // expected-error {{format argument not a string type}}
  68
  69 // PR4470
  70 int xx_vprintf(const char *, va_list);
  71
  72 const char *foo(const char *format) __attribute__((format_arg(1)));
  73
  74 void __attribute__((format(printf, 1, 0)))
  75 foo2(const char *fmt, va_list va) {
  76   xx_vprintf(foo(fmt), va);
  77 }
  78
  79 // PR6542
  80 extern void gcc_format(const char *, ...)
  81     __attribute__((__format__(__gcc_diag__, 1, 2)));
  82 extern void gcc_cformat(const char *, ...)
  83     __attribute__((__format__(__gcc_cdiag__, 1, 2)));
  84 extern void gcc_cxxformat(const char *, ...)
  85     __attribute__((__format__(__gcc_cxxdiag__, 1, 2)));
  86 extern void gcc_tformat(const char *, ...)
  87     __attribute__((__format__(__gcc_tdiag__, 1, 2)));
  88
  89 const char *foo3(const char *format) __attribute__((format_arg("foo"))); // expected-error{{'format_arg' attribute requires parameter 1 to be an integer constant}}
  90
  91 void call_nonvariadic(void) {
  92   d3("%i", 123);
  93   d3("%d", 123);
  94   d3("%s", 123); // expected-warning{{format specifies type 'char *' but the argument has type 'int'}}
  95 }
  96
  97 __attribute__((format(printf, 1, 2))) void forward_fixed(const char *fmt, int i) { // expected-warning{{GCC requires a function with the 'format' attribute to be variadic}}
  98   forward_fixed(fmt, i);
  99   a(fmt, i);
 100 }
 101
 102 __attribute__((format(printf, 1, 2))) void forward_fixed_2(const char *fmt, int i, int j) { // expected-warning{{GCC requires a function with the 'format' attribute to be variadic}}
 103   forward_fixed_2(fmt, i, j);
 104   a(fmt, i);
 105 }
 106