modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/builtins/strstr.c (about)

     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  }