string/tst-strlen.c

   1 #include <stdio.h>
   2 #include <string.h>
   3
   4 int
   5 main(int argc, char *argv[])
   6 {
   7   static const size_t lens[] = { 0, 1, 0, 2, 0, 1, 0, 3,
   8                                  0, 1, 0, 2, 0, 1, 0, 4 };
   9   char basebuf[24 + 32];
  10   size_t base;
  11
  12   for (base = 0; base < 32; ++base)
  13     {
  14       char *buf = basebuf + base;
  15       size_t words;
  16
  17       for (words = 0; words < 4; ++words)
  18         {
  19           size_t last;
  20           memset (buf, 'a', words * 4);
  21
  22           for (last = 0; last < 16; ++last)
  23             {
  24               buf[words * 4 + 0] = (last & 1) != 0 ? 'b' : '\0';
  25               buf[words * 4 + 1] = (last & 2) != 0 ? 'c' : '\0';
  26               buf[words * 4 + 2] = (last & 4) != 0 ? 'd' : '\0';
  27               buf[words * 4 + 3] = (last & 8) != 0 ? 'e' : '\0';
  28               buf[words * 4 + 4] = '\0';
  29
  30               if (strlen (buf) != words * 4 + lens[last])
  31                 {
  32                   printf ("failed for base=%d, words=%d, and last=%d\n",
  33                           base, words, last);
  34                   return 1;
  35                 }
  36             }
  37         }
  38     }
  39   return 0;
  40 }