string/test-strndup.c

   1 /* Test strndup functions.
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/check.h>
  20
  21 #define TEST_MAIN
  22 #include "test-string.h"
  23
  24 static void
  25 do_one_test (const char *src, size_t len, size_t n)
  26 {
  27   char *dst = strndup (src, n);
  28   size_t s = (len > n ? n: len) * sizeof (char);
  29
  30   TEST_COMPARE_BLOB (dst, s, src, s);
  31
  32   free (dst);
  33 }
  34
  35 static void
  36 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
  37 {
  38   size_t i;
  39   char *s1;
  40
  41   align1 &= 7;
  42   if ((align1 + len) * sizeof (char) >= page_size)
  43     return;
  44
  45   align2 &= 7;
  46   if ((align2 + len) * sizeof (char) >= page_size)
  47     return;
  48
  49   s1 = (char *) (buf1) + align1;
  50
  51   for (i = 0; i < len; ++i)
  52     s1[i] = 32 + 23 * i % (max_char - 32);
  53   s1[len] = 0;
  54   for (i = len + 1; (i + align1) * sizeof (char) < page_size && i < len + 64;
  55        ++i)
  56     s1[i] = 32 + 32 * i % (max_char - 32);
  57
  58   do_one_test (s1, len, n);
  59 }
  60
  61 static void
  62 do_page_tests (void)
  63 {
  64   char *s1;
  65   const size_t maxoffset = 64;
  66
  67   /* Put s1 at the maxoffset from the edge of buf1's last page.  */
  68   s1 = (char *) buf1 + BUF1PAGES * page_size / sizeof (char) - maxoffset;
  69
  70   memset (s1, 'a', maxoffset - 1);
  71   s1[maxoffset - 1] = '\0';
  72
  73   /* Both strings are bounded to a page with read/write access and the next
  74      page is protected with PROT_NONE (meaning that any access outside of the
  75      page regions will trigger an invalid memory access).
  76
  77      The loop copies the string s1 for all possible offsets up to maxoffset
  78      for both inputs with a size larger than s1 (so memory access outside the
  79      expected memory regions might trigger invalid access).  */
  80
  81   for (size_t off1 = 0; off1 < maxoffset; off1++)
  82     for (size_t off2 = 0; off2 < maxoffset; off2++)
  83       do_one_test (s1 + off1, maxoffset - off1 - 1,
  84                    maxoffset + (maxoffset - off2));
  85 }
  86
  87 static void
  88 do_random_tests (void)
  89 {
  90   size_t i, j, n, align1, align2, len, size, mode;
  91   char *p1 = (char *) (buf1 + page_size) - 512;
  92   char *res;
  93
  94   for (n = 0; n < ITERATIONS; n++)
  95     {
  96       mode = random ();
  97       if (mode & 1)
  98         {
  99           size = random () & 255;
 100           align1 = 512 - size - (random () & 15);
 101           if (mode & 2)
 102             align2 = align1 - (random () & 24);
 103           else
 104             align2 = align1 - (random () & 31);
 105           if (mode & 4)
 106             {
 107               j = align1;
 108               align1 = align2;
 109               align2 = j;
 110             }
 111           if (mode & 8)
 112             len = size - (random () & 31);
 113           else
 114             len = 512;
 115           if (len >= 512)
 116             len = random () & 511;
 117         }
 118       else
 119         {
 120           align1 = random () & 31;
 121           if (mode & 2)
 122             align2 = random () & 31;
 123           else
 124             align2 = align1 + (random () & 24);
 125           len = random () & 511;
 126           j = align1;
 127           if (align2 > j)
 128             j = align2;
 129           if (mode & 4)
 130             {
 131               size = random () & 511;
 132               if (size + j > 512)
 133                 size = 512 - j - (random () & 31);
 134             }
 135           else
 136             size = 512 - j;
 137           if ((mode & 8) && len + j >= 512)
 138             len = 512 - j - (random () & 7);
 139         }
 140       j = len + align1 + 64;
 141       if (j > 512)
 142         j = 512;
 143       for (i = 0; i < j; i++)
 144         {
 145           if (i == len + align1)
 146             p1[i] = 0;
 147           else
 148             {
 149               p1[i] = random () & CHAR_MAX;
 150               if (i >= align1 && i < len + align1 && !p1[i])
 151                 p1[i] = (random () & 127) + 3;
 152             }
 153         }
 154
 155         res = (char *) strndup ((char *) (p1 + align1), size);
 156         j = len + 1;
 157         if (size < j)
 158           j = size;
 159         TEST_COMPARE_BLOB (res, j, (char *) (p1 + align1), j);
 160         free (res);
 161     }
 162 }
 163
 164 int
 165 test_main (void)
 166 {
 167   size_t i;
 168
 169   test_init ();
 170
 171   printf ("%28s", "");
 172   printf ("\t%s", "strndup");
 173   putchar ('\n');
 174
 175   for (i = 1; i < 8; ++i)
 176     {
 177       do_test (i, i, 16, 16, 127);
 178       do_test (i, i, 16, 16, CHAR_MAX);
 179       do_test (i, 2 * i, 16, 16, 127);
 180       do_test (2 * i, i, 16, 16, CHAR_MAX);
 181       do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);
 182       do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);
 183       do_test (8 - i, 2 * i, 1 << i, 2 << i, CHAR_MAX);
 184       do_test (2 * i, 8 - i, 2 << i, 1 << i, CHAR_MAX);
 185     }
 186
 187   for (i = 1; i < 8; ++i)
 188     {
 189       do_test (0, 0, 4 << i, 8 << i, 127);
 190       do_test (0, 0, 16 << i, 8 << i, 127);
 191       do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);
 192       do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);
 193     }
 194
 195   do_random_tests ();
 196   do_page_tests ();
 197   return ret;
 198 }
 199
 200 #include <support/test-driver.c>