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

     1  /* Copyright (C) 2000, 2001, 2003  Free Software Foundation.
     2  
     3     Ensure all expected transformations of builtin strncmp occur and
     4     perform correctly.
     5  
     6     Written by Kaveh R. Ghazi, 11/26/2000.  */
     7  
     8  extern void abort (void);
     9  typedef __SIZE_TYPE__ size_t;
    10  extern int strncmp (const char *, const char *, size_t);
    11  
    12  void
    13  main_test (void)
    14  {
    15    const char *const s1 = "hello world";
    16    const char *s2, *s3;
    17    
    18    if (strncmp (s1, "hello world", 12) != 0)
    19      abort();
    20    if (strncmp ("hello world", s1, 12) != 0)
    21      abort();
    22    if (strncmp ("hello", "hello", 6) != 0)
    23      abort();
    24    if (strncmp ("hello", "hello", 2) != 0)
    25      abort();
    26    if (strncmp ("hello", "hello", 100) != 0)
    27      abort();
    28    if (strncmp (s1+10, "d", 100) != 0)
    29      abort();
    30    if (strncmp (10+s1, "d", 100) != 0)
    31      abort();
    32    if (strncmp ("d", s1+10, 1) != 0)
    33      abort();
    34    if (strncmp ("d", 10+s1, 1) != 0)
    35      abort();
    36    if (strncmp ("hello", "aaaaa", 100) <= 0)
    37      abort();
    38    if (strncmp ("aaaaa", "hello", 100) >= 0)
    39      abort();
    40    if (strncmp ("hello", "aaaaa", 1) <= 0)
    41      abort();
    42    if (strncmp ("aaaaa", "hello", 1) >= 0)
    43      abort();
    44  
    45    s2 = s1; s3 = s1+4;
    46    if (strncmp (++s2, ++s3, 0) != 0 || s2 != s1+1 || s3 != s1+5)
    47      abort();
    48    s2 = s1;
    49    if (strncmp (++s2, "", 1) <= 0 || s2 != s1+1)
    50      abort();
    51    if (strncmp ("", ++s2, 1) >= 0 || s2 != s1+2)
    52      abort();
    53    if (strncmp (++s2, "", 100) <= 0 || s2 != s1+3)
    54      abort();
    55    if (strncmp ("", ++s2, 100) >= 0 || s2 != s1+4)
    56      abort();
    57    if (strncmp (++s2+6, "", 100) != 0 || s2 != s1+5)
    58      abort();
    59    if (strncmp ("", ++s2+5, 100) != 0 || s2 != s1+6)
    60      abort();
    61    if (strncmp ("ozz", ++s2, 1) != 0 || s2 != s1+7)
    62      abort();
    63    if (strncmp (++s2, "rzz", 1) != 0 || s2 != s1+8)
    64      abort();
    65    s2 = s1; s3 = s1+4;
    66    if (strncmp (++s2, ++s3+2, 1) >= 0 || s2 != s1+1 || s3 != s1+5)
    67      abort();
    68    
    69    /* Test at least one instance of the __builtin_ style.  We do this
    70       to ensure that it works and that the prototype is correct.  */
    71    if (__builtin_strncmp ("hello", "a", 100) <= 0)
    72      abort();
    73  }