gnu/dist/gcc4/gcc/testsuite/gcc.c-torture/execute/builtins/strstr.c

   1 /* Copyright (C) 2000  Free Software Foundation.
   2
   3    Ensure all expected transformations of builtin strstr occur and
   4    perform correctly.
   5
   6    Written by Kaveh R. Ghazi, 11/6/2000.  */
   7
   8 extern void abort(void);
   9 extern char *strstr (const char *, const char *);
  10
  11 void
  12 main_test (void)
  13 {
  14   const char *const foo = "hello world";
  15
  16   if (strstr (foo, "") != foo)
  17     abort();
  18   if (strstr (foo + 4, "") != foo + 4)
  19     abort();
  20   if (strstr (foo, "h") != foo)
  21     abort();
  22   if (strstr (foo, "w") != foo + 6)
  23     abort();
  24   if (strstr (foo + 6, "o") != foo + 7)
  25     abort();
  26   if (strstr (foo + 1, "world") != foo + 6)
  27     abort();
  28
  29   /* Test at least one instance of the __builtin_ style.  We do this
  30      to ensure that it works and that the prototype is correct.  */
  31   if (__builtin_strstr (foo + 1, "world") != foo + 6)
  32     abort();
  33 }