tests/test-strchrnul.c

   1 /*
   2  * Copyright (C) 2008-2024 Free Software Foundation, Inc.
   3  * Written by Eric Blake and Bruno Haible
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 #include <string.h>
  21
  22 #include "signature.h"
  23 SIGNATURE_CHECK (strchrnul, char *, (char const *, int));
  24
  25 #include <stdlib.h>
  26
  27 #include "macros.h"
  28
  29 int
  30 main (void)
  31 {
  32   size_t n = 0x100000;
  33   char *input = malloc (n + 1);
  34   ASSERT (input);
  35
  36   input[0] = 'a';
  37   input[1] = 'b';
  38   memset (input + 2, 'c', 1024);
  39   memset (input + 1026, 'd', n - 1028);
  40   input[n - 2] = 'e';
  41   input[n - 1] = 'a';
  42   input[n] = '\0';
  43
  44   /* Basic behavior tests.  */
  45   ASSERT (strchrnul (input, 'a') == input);
  46   ASSERT (strchrnul (input, 'b') == input + 1);
  47   ASSERT (strchrnul (input, 'c') == input + 2);
  48   ASSERT (strchrnul (input, 'd') == input + 1026);
  49
  50   ASSERT (strchrnul (input + 1, 'a') == input + n - 1);
  51   ASSERT (strchrnul (input + 1, 'e') == input + n - 2);
  52
  53   ASSERT (strchrnul (input, 'f') == input + n);
  54   ASSERT (strchrnul (input, '\0') == input + n);
  55
  56   /* Check that a very long haystack is handled quickly if the byte is
  57      found near the beginning.  */
  58   {
  59     size_t repeat = 10000;
  60     for (; repeat > 0; repeat--)
  61       {
  62         ASSERT (strchrnul (input, 'c') == input + 2);
  63       }
  64   }
  65
  66   /* Alignment tests.  */
  67   {
  68     int i, j;
  69     for (i = 0; i < 32; i++)
  70       {
  71         for (j = 0; j < 256; j++)
  72           input[i + j] = (j + 1) & 0xff;
  73         for (j = 1; j < 256; j++)
  74           {
  75             ASSERT (strchrnul (input + i, j) == input + i + j - 1);
  76             input[i + j - 1] = (j == 1 ? 2 : 1);
  77             ASSERT (strchrnul (input + i, j) == input + i + 255);
  78             input[i + j - 1] = j;
  79           }
  80       }
  81   }
  82
  83   free (input);
  84
  85   return test_exit_status;
  86 }