io/tst-getcwd.c

   1 /* Test of getcwd function.
   2    Copyright (C) 2000, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/param.h>
  27
  28
  29 #define TEST_FUNCTION do_test ()
  30 static int
  31 do_test (void)
  32 {
  33   char thepath[4096];   /* Yes, this limits the environment this test
  34                            can run it but I honestly don't care about
  35                            people which have this problem.  */
  36   char *bufs[10];
  37   size_t lens[10];
  38   size_t sbs;
  39   size_t len, i;
  40
  41   if (getcwd (thepath, sizeof thepath) == NULL)
  42     {
  43       if (errno == ERANGE)
  44         /* The path is too long, skip all tests.  */
  45         return 0;
  46
  47       puts ("getcwd (thepath, sizeof thepath) failed");
  48       return 1;
  49     }
  50   len = strlen (thepath);
  51
  52   sbs = 1;
  53   while (sbs < len + 1)
  54     sbs <<= 1;
  55
  56   for (i = 0; i < 4; ++i)
  57     {
  58       lens[i] = sbs;
  59       bufs[i] = (char *) malloc (sbs);
  60     }
  61
  62   bufs[i] = getcwd (NULL, sbs);
  63   lens[i] = sbs;
  64   if (bufs[i] == NULL)
  65     {
  66       puts ("getcwd (NULL, sbs) failed");
  67       return 1;
  68     }
  69   ++i;
  70
  71   for (; i < 10; sbs >>= 1, ++i)
  72     {
  73       bufs[i] = (char *) malloc (MAX (1, sbs));
  74       lens[i] = sbs;
  75     }
  76
  77   /* Before we test the result write something in the memory to see
  78      whether the allocation went right.  */
  79   for (i = 0; i < 10; ++i)
  80     if (i != 4 && bufs[i] != NULL)
  81       memset (bufs[i], '\xff', lens[i]);
  82
  83   if (strcmp (thepath, bufs[4]) != 0)
  84     {
  85       printf ("\
  86 getcwd (NULL, sbs) = \"%s\", getcwd (thepath, sizeof thepath) = \"%s\"\n",
  87               bufs[4], thepath);
  88       return 1;
  89     }
  90
  91   /* Now overwrite all buffers to see that getcwd allocated the buffer
  92      of right size.  */
  93   for (i = 0; i < 10; ++i)
  94     memset (bufs[i], i, lens[i]);
  95
  96   for (i = 0; i < 10; ++i)
  97     free (bufs[i]);
  98
  99   /* Test whether the function signals success despite the buffer
 100      being too small.  */
 101   if (getcwd (NULL, len) != NULL)
 102     {
 103       puts ("getcwd (NULL, len) didn't failed");
 104       return 1;
 105     }
 106
 107   bufs[0] = malloc (len);
 108   bufs[1] = malloc (len);
 109   bufs[2] = malloc (len);
 110   if (bufs[1] != NULL)
 111     {
 112       if (getcwd (bufs[1], len) != NULL)
 113         {
 114           puts ("getcwd (bufs[1], len) didn't failed");
 115           return 1;
 116         }
 117       free (bufs[0]);
 118       free (bufs[1]);
 119       free (bufs[2]);
 120     }
 121
 122   memset (thepath, '\xfe', sizeof (thepath));
 123   if (getcwd (thepath, len) != NULL)
 124     {
 125       puts ("getcwd (thepath, len) didn't failed");
 126       return 1;
 127     }
 128
 129   for (i = len; i < sizeof thepath; ++i)
 130     if (thepath[i] != '\xfe')
 131       {
 132         puts ("thepath[i] != '\xfe'");
 133         return 1;
 134       }
 135
 136   /* Now test handling of correctly sized buffers.  */
 137   bufs[0] = getcwd (NULL, len + 1);
 138   if (bufs[0] == NULL)
 139     {
 140       puts ("getcwd (NULL, len + 1) failed");
 141       return 1;
 142     }
 143   free (bufs[0]);
 144
 145   memset (thepath, '\xff', sizeof thepath);
 146   if (getcwd (thepath, len + 1) == NULL)
 147     {
 148       puts ("getcwd (thepath, len + 1) failed");
 149       return 1;
 150     }
 151
 152   for (i = len + 1; i < sizeof thepath; ++i)
 153     if (thepath[i] != '\xff')
 154       {
 155         printf ("thepath[%zd] != '\xff'\n", i);
 156         return 1;
 157       }
 158
 159   puts ("everything OK");
 160
 161   return 0;
 162 }
 163
 164 #include "../test-skeleton.c"