strstr.c

来自「用于进行gcc测试」· C语言 代码 · 共 34 行

/* Copyright (C) 2000  Free Software Foundation.

   Ensure all expected transformations of builtin strstr occur and
   perform correctly.

   Written by Kaveh R. Ghazi, 11/6/2000.  */

extern void abort(void);
extern char *strstr (const char *, const char *);

void
main_test (void)
{
  const char *const foo = "hello world";
  
  if (strstr (foo, "") != foo)
    abort();
  if (strstr (foo + 4, "") != foo + 4)
    abort();
  if (strstr (foo, "h") != foo)
    abort();
  if (strstr (foo, "w") != foo + 6)
    abort();
  if (strstr (foo + 6, "o") != foo + 7)
    abort();
  if (strstr (foo + 1, "world") != foo + 6)
    abort();

  /* Test at least one instance of the __builtin_ style.  We do this
     to ensure that it works and that the prototype is correct.  */
  if (__builtin_strstr (foo + 1, "world") != foo + 6)
    abort();
}