gcc/testsuite/gcc.c-torture/execute/builtins/strncmp.c

   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 }