grp/tst_fgetgrent.c

   1 /* Copyright (C) 1999-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <grp.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24
  25 static int errors;
  26
  27 static void
  28 write_users (FILE *f, int large_pos, int pos)
  29 {
  30   int i;
  31
  32   if (pos == large_pos)
  33     {
  34       if (large_pos == 3)
  35         fprintf (f, ":three");
  36
  37       /* we need more than 2048 bytes for proper testing.  */
  38       for (i = 0; i < 500; i++)
  39         fprintf (f, ",user%03d", i);
  40     }
  41   fprintf (f, "\n");
  42
  43 }
  44
  45 static void
  46 write_group (const char *filename, int pos)
  47 {
  48   FILE *f;
  49
  50   f = fopen (filename, "w");
  51   fprintf (f, "one:x:1:one");
  52   write_users (f, pos, 1);
  53   fprintf (f, "two:x:2:two");
  54   write_users (f, pos, 2);
  55   fprintf (f, "three:x:3");
  56   write_users (f, pos, 3);
  57   fclose (f);
  58 }
  59
  60 static void
  61 test_entry (const char *name, gid_t gid, struct group *g)
  62 {
  63   if (!g)
  64     {
  65       printf ("Error: Entry is empty\n");
  66       errors++;
  67       return;
  68     }
  69
  70   if ((g->gr_gid == gid) && (strcmp (g->gr_name, name) == 0))
  71     printf ("Ok: %s: %d\n", g->gr_name, g->gr_gid);
  72   else
  73     {
  74       printf ("Error: %s: %d should be: %s: %d\n", g->gr_name, g->gr_gid,
  75               name, gid);
  76       errors++;
  77     }
  78 }
  79
  80
  81 static void
  82 test_fgetgrent (const char *filename)
  83 {
  84   struct group *g;
  85   FILE *f;
  86
  87   f = fopen (filename,"r");
  88
  89   g = fgetgrent (f);
  90   test_entry ("one", 1, g);
  91   g = fgetgrent (f);
  92   test_entry ("two", 2, g);
  93   g = fgetgrent (f);
  94   test_entry ("three", 3, g);
  95   fclose (f);
  96 }
  97
  98
  99 int
 100 main (int argc, char *argv[])
 101 {
 102   char file[] = "/tmp/tst_fgetgrent.XXXXXX";
 103   int fd = mkstemp (file);
 104   if (fd == -1)
 105     {
 106       printf ("mkstemp failed: %m\n");
 107       return 1;
 108     }
 109   close (fd);
 110   int i = 0;
 111
 112   if (argc > 1)
 113     i = atoi (argv[1]);
 114   if (i > 3)
 115     i = 3;
 116   if (i)
 117     printf ("Large group is group: %d\n", i);
 118   else
 119     printf ("Not using a large group\n");
 120   write_group (file, i);
 121   test_fgetgrent (file);
 122
 123   remove (file);
 124
 125   return (errors != 0);
 126 }