io/tst-getcwd.c

   1 /* Test of getcwd function.
   2    Copyright (C) 2000-2024 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 <errno.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/param.h>
  25 #include <libc-diag.h>
  26
  27
  28 #define TEST_FUNCTION do_test ()
  29 static int
  30 do_test (void)
  31 {
  32   char thepath[4096];   /* Yes, this limits the environment this test
  33                            can run it but I honestly don't care about
  34                            people which have this problem.  */
  35   char *bufs[10];
  36   size_t lens[10];
  37   size_t sbs;
  38   size_t len, i;
  39
  40   if (getcwd (thepath, sizeof thepath) == NULL)
  41     {
  42       if (errno == ERANGE)
  43         /* The path is too long, skip all tests.  */
  44         return 0;
  45
  46       puts ("getcwd (thepath, sizeof thepath) failed");
  47       return 1;
  48     }
  49   len = strlen (thepath);
  50
  51   sbs = 1;
  52   while (sbs < len + 1)
  53     sbs <<= 1;
  54
  55   for (i = 0; i < 4; ++i)
  56     {
  57       lens[i] = sbs;
  58       bufs[i] = (char *) malloc (sbs);
  59     }
  60
  61   /* Avoid warnings about the first argument being null when the second
  62      is nonzero.  */
  63   DIAG_PUSH_NEEDS_COMMENT;
  64   DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wnonnull");
  65   bufs[i] = getcwd (NULL, sbs);
  66   DIAG_POP_NEEDS_COMMENT;
  67
  68   lens[i] = sbs;
  69   if (bufs[i] == NULL)
  70     {
  71       puts ("getcwd (NULL, sbs) failed");
  72       return 1;
  73     }
  74   ++i;
  75
  76   for (; i < 10; sbs >>= 1, ++i)
  77     {
  78       bufs[i] = (char *) malloc (MAX (1, sbs));
  79       lens[i] = sbs;
  80     }
  81
  82   /* Before we test the result write something in the memory to see
  83      whether the allocation went right.  */
  84   for (i = 0; i < 10; ++i)
  85     if (i != 4 && bufs[i] != NULL)
  86       memset (bufs[i], '\xff', lens[i]);
  87
  88   if (strcmp (thepath, bufs[4]) != 0)
  89     {
  90       printf ("\
  91 getcwd (NULL, sbs) = \"%s\", getcwd (thepath, sizeof thepath) = \"%s\"\n",
  92               bufs[4], thepath);
  93       return 1;
  94     }
  95
  96   /* Now overwrite all buffers to see that getcwd allocated the buffer
  97      of right size.  */
  98   for (i = 0; i < 10; ++i)
  99     memset (bufs[i], i, lens[i]);
 100
 101   for (i = 0; i < 10; ++i)
 102     free (bufs[i]);
 103
 104   /* Test whether the function signals success despite the buffer
 105      being too small.
 106      Avoid warnings about the first argument being null when the second
 107      is nonzero.  */
 108   DIAG_PUSH_NEEDS_COMMENT;
 109   DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wnonnull");
 110   if (getcwd (NULL, len) != NULL)
 111     {
 112       puts ("getcwd (NULL, len) didn't failed");
 113       return 1;
 114     }
 115   DIAG_POP_NEEDS_COMMENT;
 116
 117   bufs[0] = malloc (len);
 118   bufs[1] = malloc (len);
 119   bufs[2] = malloc (len);
 120   if (bufs[1] != NULL)
 121     {
 122       if (getcwd (bufs[1], len) != NULL)
 123         {
 124           puts ("getcwd (bufs[1], len) didn't failed");
 125           return 1;
 126         }
 127       free (bufs[0]);
 128       free (bufs[1]);
 129       free (bufs[2]);
 130     }
 131
 132   memset (thepath, '\xfe', sizeof (thepath));
 133   if (getcwd (thepath, len) != NULL)
 134     {
 135       puts ("getcwd (thepath, len) didn't failed");
 136       return 1;
 137     }
 138
 139   for (i = len; i < sizeof thepath; ++i)
 140     if (thepath[i] != '\xfe')
 141       {
 142         puts ("thepath[i] != '\xfe'");
 143         return 1;
 144       }
 145
 146   /* Now test handling of correctly sized buffers.
 147      Again. avoid warnings about the first argument being null when
 148      the second is nonzero.  */
 149   DIAG_PUSH_NEEDS_COMMENT;
 150   DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wnonnull");
 151   bufs[0] = getcwd (NULL, len + 1);
 152   if (bufs[0] == NULL)
 153     {
 154       puts ("getcwd (NULL, len + 1) failed");
 155       return 1;
 156     }
 157   DIAG_POP_NEEDS_COMMENT;
 158   free (bufs[0]);
 159
 160   memset (thepath, '\xff', sizeof thepath);
 161   if (getcwd (thepath, len + 1) == NULL)
 162     {
 163       puts ("getcwd (thepath, len + 1) failed");
 164       return 1;
 165     }
 166
 167   for (i = len + 1; i < sizeof thepath; ++i)
 168     if (thepath[i] != '\xff')
 169       {
 170         printf ("thepath[%zd] != '\xff'\n", i);
 171         return 1;
 172       }
 173
 174   puts ("everything OK");
 175
 176   return 0;
 177 }
 178
 179 #include "../test-skeleton.c"