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

     1  /* Copyright (C) 2000, 2003  Free Software Foundation.
     2  
     3     Ensure all expected transformations of builtin strchr and index
     4     occur and perform correctly.
     5  
     6     Written by Jakub Jelinek, 11/7/2000.  */
     7  
     8  extern void abort (void);
     9  extern char *strchr (const char *, int);
    10  extern char *index (const char *, int);
    11  
    12  void
    13  main_test (void)
    14  {
    15    const char *const foo = "hello world";
    16  
    17    if (strchr (foo, 'x'))
    18      abort ();
    19    if (strchr (foo, 'o') != foo + 4)
    20      abort ();
    21    if (strchr (foo + 5, 'o') != foo + 7)
    22      abort ();
    23    if (strchr (foo, '\0')  != foo + 11)
    24      abort ();
    25    /* Test only one instance of index since the code path is the same
    26       as that of strchr. */
    27    if (index ("hello", 'z')  != 0)
    28      abort ();
    29  
    30    /* Test at least one instance of the __builtin_ style.  We do this
    31       to ensure that it works and that the prototype is correct.  */
    32    if (__builtin_strchr (foo, 'o')  != foo + 4)
    33      abort ();
    34    if (__builtin_index (foo, 'o')  != foo + 4)
    35      abort ();
    36  }