clang/test/Sema/attr-format_arg.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 int printf(const char *, ...);
   4
   5 const char* f(const char *s) __attribute__((format_arg(1)));
   6
   7 const char *h(const char *msg1, const char *msg2)
   8     __attribute__((__format_arg__(1))) __attribute__((__format_arg__(2)));
   9
  10 void g(const char *s) {
  11   printf("%d", 123);
  12   printf("%d %d", 123); // expected-warning{{more '%' conversions than data arguments}}
  13
  14   printf(f("%d"), 123);
  15   printf(f("%d %d"), 123); // expected-warning{{more '%' conversions than data arguments}}
  16
  17   printf(h(
  18     "", // expected-warning {{format string is empty}}
  19     ""  // expected-warning {{format string is empty}}
  20   ), 123);
  21   printf(h(
  22     "%d",
  23     ""  // expected-warning {{format string is empty}}
  24   ), 123);
  25   printf(h(
  26     "", // expected-warning {{format string is empty}}
  27     "%d"
  28   ), 123);
  29   printf(h("%d", "%d"), 123);
  30 }