modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/memset-1.c (about)

     1  /* Copyright (C) 2002  Free Software Foundation.
     2  
     3     Test memset with various combinations of pointer alignments and lengths to
     4     make sure any optimizations in the library are correct.
     5  
     6     Written by Michael Meissner, March 9, 2002.  */
     7  
     8  #include <string.h>
     9  
    10  #ifndef MAX_OFFSET
    11  #define MAX_OFFSET (sizeof (long long))
    12  #endif
    13  
    14  #ifndef MAX_COPY
    15  #define MAX_COPY (10 * sizeof (long long))
    16  #endif
    17  
    18  #ifndef MAX_EXTRA
    19  #define MAX_EXTRA (sizeof (long long))
    20  #endif
    21  
    22  #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + MAX_EXTRA)
    23  
    24  static union {
    25    char buf[MAX_LENGTH];
    26    long long align_int;
    27    long double align_fp;
    28  } u;
    29  
    30  char A = 'A';
    31  
    32  main ()
    33  {
    34    int off, len, i;
    35    char *p, *q;
    36  
    37    for (off = 0; off < MAX_OFFSET; off++)
    38      for (len = 1; len < MAX_COPY; len++)
    39        {
    40  	for (i = 0; i < MAX_LENGTH; i++)
    41  	  u.buf[i] = 'a';
    42  
    43  	p = memset (u.buf + off, '\0', len);
    44  	if (p != u.buf + off)
    45  	  abort ();
    46  
    47  	q = u.buf;
    48  	for (i = 0; i < off; i++, q++)
    49  	  if (*q != 'a')
    50  	    abort ();
    51  
    52  	for (i = 0; i < len; i++, q++)
    53  	  if (*q != '\0')
    54  	    abort ();
    55  
    56  	for (i = 0; i < MAX_EXTRA; i++, q++)
    57  	  if (*q != 'a')
    58  	    abort ();
    59  
    60  	p = memset (u.buf + off, A, len);
    61  	if (p != u.buf + off)
    62  	  abort ();
    63  
    64  	q = u.buf;
    65  	for (i = 0; i < off; i++, q++)
    66  	  if (*q != 'a')
    67  	    abort ();
    68  
    69  	for (i = 0; i < len; i++, q++)
    70  	  if (*q != 'A')
    71  	    abort ();
    72  
    73  	for (i = 0; i < MAX_EXTRA; i++, q++)
    74  	  if (*q != 'a')
    75  	    abort ();
    76  
    77  	p = memset (u.buf + off, 'B', len);
    78  	if (p != u.buf + off)
    79  	  abort ();
    80  
    81  	q = u.buf;
    82  	for (i = 0; i < off; i++, q++)
    83  	  if (*q != 'a')
    84  	    abort ();
    85  
    86  	for (i = 0; i < len; i++, q++)
    87  	  if (*q != 'B')
    88  	    abort ();
    89  
    90  	for (i = 0; i < MAX_EXTRA; i++, q++)
    91  	  if (*q != 'a')
    92  	    abort ();
    93        }
    94  
    95    exit (0);
    96  }