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