tests/test-read-file.c

   1 /*
   2  * Copyright (C) 2006-2007, 2010-2018 Free Software Foundation, Inc.
   3  * Written by Simon Josefsson
   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 "read-file.h"
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/stat.h>
  25
  26 #define FILE1 "/etc/resolv.conf"
  27 #define FILE2 "/dev/null"
  28
  29 int
  30 main (void)
  31 {
  32   struct stat statbuf;
  33   int err = 0;
  34
  35   /* We can perform the test only if the file exists and is readable.
  36      Test whether it exists, then assume it is world-readable.  */
  37   if (stat (FILE1, &statbuf) >= 0)
  38     {
  39       size_t len;
  40       char *out = read_file (FILE1, &len);
  41
  42       if (!out)
  43         {
  44           perror ("Could not read file");
  45           err = 1;
  46         }
  47       else
  48         {
  49           if (out[len] != '\0')
  50             {
  51               perror ("BAD: out[len] not zero");
  52               err = 1;
  53             }
  54
  55           if (S_ISREG (statbuf.st_mode))
  56             {
  57               /* FILE1 is a regular file or a symlink to a regular file.  */
  58               if (len != statbuf.st_size)
  59                 {
  60                   fprintf (stderr, "Read %lu from %s...\n",
  61                            (unsigned long) len, FILE1);
  62                   err = 1;
  63                 }
  64             }
  65           else
  66             {
  67               /* Assume FILE1 is not empty.  */
  68               if (len == 0)
  69                 {
  70                   fprintf (stderr, "Read nothing from %s\n", FILE1);
  71                   err = 1;
  72                 }
  73             }
  74           free (out);
  75         }
  76     }
  77
  78   /* We can perform the test only if the file exists and is readable.
  79      Test whether it exists, then assume it is world-readable.  */
  80   if (stat (FILE2, &statbuf) >= 0)
  81     {
  82       size_t len;
  83       char *out = read_file (FILE2, &len);
  84
  85       if (!out)
  86         {
  87           perror ("Could not read file");
  88           err = 1;
  89         }
  90       else
  91         {
  92           if (out[len] != '\0')
  93             {
  94               perror ("BAD: out[len] not zero");
  95               err = 1;
  96             }
  97
  98           /* /dev/null should always be empty.  Ignore statbuf.st_size, since it
  99              is not a regular file.  */
 100           if (len != 0)
 101             {
 102               fprintf (stderr, "Read %lu from %s...\n",
 103                        (unsigned long) len, FILE2);
 104               err = 1;
 105             }
 106           free (out);
 107         }
 108     }
 109
 110   return err;
 111 }