grp/tst_fgetgrent.c

   1 /* Copyright (C) 1999-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de>, 1999.
   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 <grp.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/types.h>
  24 #include <unistd.h>
  25
  26 static int errors;
  27
  28 static void
  29 write_users (FILE *f, int large_pos, int pos)
  30 {
  31   int i;
  32
  33   if (pos == large_pos)
  34     {
  35       if (large_pos == 3)
  36         fprintf (f, ":three");
  37
  38       /* we need more than 2048 bytes for proper testing.  */
  39       for (i = 0; i < 500; i++)
  40         fprintf (f, ",user%03d", i);
  41     }
  42   fprintf (f, "\n");
  43
  44 }
  45
  46 static void
  47 write_group (const char *filename, int pos)
  48 {
  49   FILE *f;
  50
  51   f = fopen (filename, "w");
  52   fprintf (f, "one:x:1:one");
  53   write_users (f, pos, 1);
  54   fprintf (f, "two:x:2:two");
  55   write_users (f, pos, 2);
  56   fprintf (f, "three:x:3");
  57   write_users (f, pos, 3);
  58   fclose (f);
  59 }
  60
  61 static void
  62 test_entry (const char *name, gid_t gid, struct group *g)
  63 {
  64   if (!g)
  65     {
  66       printf ("Error: Entry is empty\n");
  67       errors++;
  68       return;
  69     }
  70
  71   if ((g->gr_gid == gid) && (strcmp (g->gr_name, name) == 0))
  72     printf ("Ok: %s: %d\n", g->gr_name, g->gr_gid);
  73   else
  74     {
  75       printf ("Error: %s: %d should be: %s: %d\n", g->gr_name, g->gr_gid,
  76               name, gid);
  77       errors++;
  78     }
  79 }
  80
  81
  82 static void
  83 test_fgetgrent (const char *filename)
  84 {
  85   struct group *g;
  86   FILE *f;
  87
  88   f = fopen (filename,"r");
  89
  90   g = fgetgrent (f);
  91   test_entry ("one", 1, g);
  92   g = fgetgrent (f);
  93   test_entry ("two", 2, g);
  94   g = fgetgrent (f);
  95   test_entry ("three", 3, g);
  96   fclose (f);
  97 }
  98
  99
 100 int
 101 main (int argc, char *argv[])
 102 {
 103   char file[] = "/tmp/tst_fgetgrent.XXXXXX";
 104   int fd = mkstemp (file);
 105   if (fd == -1)
 106     {
 107       printf ("mkstemp failed: %m\n");
 108       return 1;
 109     }
 110   close (fd);
 111   int i = 0;
 112
 113   if (argc > 1)
 114     i = atoi (argv[1]);
 115   if (i > 3)
 116     i = 3;
 117   if (i)
 118     printf ("Large group is group: %d\n", i);
 119   else
 120     printf ("Not using a large group\n");
 121   write_group (file, i);
 122   test_fgetgrent (file);
 123
 124   remove (file);
 125
 126   return (errors != 0);
 127 }