tests/test-mbscasestr1.c

   1 /* Test of case-insensitive searching in a string.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <string.h>
  22
  23 #include <stdlib.h>
  24
  25 #include "macros.h"
  26
  27 int
  28 main ()
  29 {
  30   /* This test is executed in the C locale.  */
  31
  32   {
  33     const char input[] = "foo";
  34     const char *result = mbscasestr (input, "");
  35     ASSERT (result == input);
  36   }
  37
  38   {
  39     const char input[] = "foo";
  40     const char *result = mbscasestr (input, "O");
  41     ASSERT (result == input + 1);
  42   }
  43
  44   {
  45     const char input[] = "ABC ABCDAB ABCDABCDABDE";
  46     const char *result = mbscasestr (input, "ABCDaBD");
  47     ASSERT (result == input + 15);
  48   }
  49
  50   {
  51     const char input[] = "ABC ABCDAB ABCDABCDABDE";
  52     const char *result = mbscasestr (input, "ABCDaBE");
  53     ASSERT (result == NULL);
  54   }
  55
  56   /* Check that a very long haystack is handled quickly if the needle is
  57      short and occurs near the beginning.  */
  58   {
  59     size_t repeat = 10000;
  60     size_t m = 1000000;
  61     const char *needle =
  62       "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
  63       "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaAaaaaaaAAAAaaaaaaa"
  64       "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
  65     char *haystack = (char *) malloc (m + 1);
  66     if (haystack != NULL)
  67       {
  68         memset (haystack, 'A', m);
  69         haystack[0] = 'B';
  70         haystack[m] = '\0';
  71
  72         for (; repeat > 0; repeat--)
  73           {
  74             ASSERT (mbscasestr (haystack, needle) == haystack + 1);
  75           }
  76
  77         free (haystack);
  78       }
  79   }
  80
  81   /* Check that a very long needle is discarded quickly if the haystack is
  82      short.  */
  83   {
  84     size_t repeat = 10000;
  85     size_t m = 1000000;
  86     const char *haystack =
  87       "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
  88       "ABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB";
  89     char *needle = (char *) malloc (m + 1);
  90     if (needle != NULL)
  91       {
  92         memset (needle, 'A', m);
  93         needle[m] = '\0';
  94
  95         for (; repeat > 0; repeat--)
  96           {
  97             ASSERT (mbscasestr (haystack, needle) == NULL);
  98           }
  99
 100         free (needle);
 101       }
 102   }
 103
 104   /* Check that the asymptotic worst-case complexity is not quadratic.  */
 105   {
 106     size_t m = 1000000;
 107     char *haystack = (char *) malloc (2 * m + 2);
 108     char *needle = (char *) malloc (m + 2);
 109     if (haystack != NULL && needle != NULL)
 110       {
 111         const char *result;
 112
 113         memset (haystack, 'A', 2 * m);
 114         haystack[2 * m] = 'B';
 115         haystack[2 * m + 1] = '\0';
 116
 117         memset (needle, 'a', m);
 118         needle[m] = 'B';
 119         needle[m + 1] = '\0';
 120
 121         result = mbscasestr (haystack, needle);
 122         ASSERT (result == haystack + m);
 123       }
 124     free (needle);
 125     free (haystack);
 126   }
 127
 128   return test_exit_status;
 129 }