stdio-common/test_rdwr.c

   1 /* Copyright (C) 1991, 1992 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25
  26 int
  27 DEFUN(main, (argc, argv), int argc AND char **argv)
  28 {
  29   static CONST char hello[] = "Hello, world.\n";
  30   static CONST char replace[] = "Hewwo, world.\n";
  31   static CONST size_t replace_from = 2, replace_to = 4;
  32   char filename[FILENAME_MAX];
  33   char *name = strrchr(*argv, '/');
  34   char buf[BUFSIZ];
  35   FILE *f;
  36   int lose = 0;
  37
  38   if (name != NULL)
  39     ++name;
  40   else
  41     name = *argv;
  42
  43   (void) sprintf(filename, "/tmp/%s.test", name);
  44
  45   f = fopen(filename, "w+");
  46   if (f == NULL)
  47     {
  48       perror(filename);
  49       exit(1);
  50     }
  51
  52   (void) fputs(hello, f);
  53   rewind(f);
  54   (void) fgets(buf, sizeof(buf), f);
  55   rewind(f);
  56   (void) fputs(buf, f);
  57   rewind(f);
  58   {
  59     register size_t i;
  60     for (i = 0; i < replace_from; ++i)
  61       {
  62         int c = getc(f);
  63         if (c == EOF)
  64           {
  65             printf("EOF at %u.\n", i);
  66             lose = 1;
  67             break;
  68           }
  69         else if (c != hello[i])
  70           {
  71             printf("Got '%c' instead of '%c' at %u.\n",
  72                    (unsigned char) c, hello[i], i);
  73             lose = 1;
  74             break;
  75           }
  76       }
  77   }
  78
  79   {
  80     long int where = ftell(f);
  81     if (where == replace_from)
  82       {
  83         register size_t i;
  84         for (i = replace_from; i < replace_to; ++i)
  85           if (putc(replace[i], f) == EOF)
  86             {
  87               printf("putc('%c') got %s at %u.\n",
  88                      replace[i], strerror(errno), i);
  89               lose = 1;
  90               break;
  91             }
  92       }
  93     else if (where == -1L)
  94       {
  95         printf("ftell got %s (should be at %u).\n",
  96                strerror(errno), replace_from);
  97         lose = 1;
  98       }
  99     else
 100       {
 101         printf("ftell returns %u; should be %u.\n", where, replace_from);
 102         lose = 1;
 103       }
 104   }
 105
 106   if (!lose)
 107     {
 108       rewind(f);
 109       if (fgets(buf, sizeof(buf), f) == NULL)
 110         {
 111           printf("fgets got %s.\n", strerror(errno));
 112           lose = 1;
 113         }
 114       else if (strcmp(buf, replace))
 115         {
 116           printf("Read \"%s\" instead of \"%s\".\n", buf, replace);
 117           lose = 1;
 118         }
 119     }
 120
 121   if (lose)
 122     printf("Test FAILED!  Losing file is \"%s\".\n", filename);
 123   else
 124     {
 125       (void) remove(filename);
 126       puts("Test succeeded.");
 127     }
 128
 129   exit(lose ? EXIT_FAILURE : EXIT_SUCCESS);
 130 }