tests/test-fgetc.c

   1 /* Test of fgetc() function.
   2    Copyright (C) 2011-2017 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <stdio.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fgetc, int, (FILE *));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27
  28 #include "msvc-inval.h"
  29
  30 #include "macros.h"
  31
  32 int
  33 main (int argc, char **argv)
  34 {
  35   const char *filename = "test-fgetc.txt";
  36
  37   /* We don't have an fgetc() function that installs an invalid parameter
  38      handler so far.  So install that handler here, explicitly.  */
  39 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
  40     && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
  41   gl_msvc_inval_ensure_handler ();
  42 #endif
  43
  44   /* Prepare a file.  */
  45   {
  46     const char text[] = "hello world";
  47     int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
  48     ASSERT (fd >= 0);
  49     ASSERT (write (fd, text, sizeof (text)) == sizeof (text));
  50     ASSERT (close (fd) == 0);
  51   }
  52
  53   /* Test that fgetc() sets errno if someone else closes the stream
  54      fd behind the back of stdio.  */
  55   {
  56     FILE *fp = fopen (filename, "r");
  57     ASSERT (fp != NULL);
  58     ASSERT (close (fileno (fp)) == 0);
  59     errno = 0;
  60     ASSERT (fgetc (fp) == EOF);
  61     ASSERT (errno == EBADF);
  62     ASSERT (ferror (fp));
  63     fclose (fp);
  64   }
  65
  66   /* Test that fgetc() sets errno if the stream was constructed with
  67      an invalid file descriptor.  */
  68   {
  69     FILE *fp = fdopen (-1, "r");
  70     if (fp != NULL)
  71       {
  72         errno = 0;
  73         ASSERT (fgetc (fp) == EOF);
  74         ASSERT (errno == EBADF);
  75         ASSERT (ferror (fp));
  76         fclose (fp);
  77       }
  78   }
  79   {
  80     FILE *fp;
  81     close (99);
  82     fp = fdopen (99, "r");
  83     if (fp != NULL)
  84       {
  85         errno = 0;
  86         ASSERT (fgetc (fp) == EOF);
  87         ASSERT (errno == EBADF);
  88         ASSERT (ferror (fp));
  89         fclose (fp);
  90       }
  91   }
  92
  93   /* Clean up.  */
  94   unlink (filename);
  95
  96   return 0;
  97 }