tests/test-fputc.c

   1 /* Test of fputc() 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 (fputc, int, (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-fputc.txt";
  36
  37   /* We don't have an fputc() 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   /* Test that fputc() on an unbuffered stream sets errno if someone else
  45      closes the stream fd behind the back of stdio.  */
  46   {
  47     FILE *fp = fopen (filename, "w");
  48     ASSERT (fp != NULL);
  49     setvbuf (fp, NULL, _IONBF, 0);
  50     ASSERT (close (fileno (fp)) == 0);
  51     errno = 0;
  52     ASSERT (fputc ('x', fp) == EOF);
  53     ASSERT (errno == EBADF);
  54     ASSERT (ferror (fp));
  55     fclose (fp);
  56   }
  57
  58   /* Test that fputc() on an unbuffered stream sets errno if the stream
  59      was constructed with an invalid file descriptor.  */
  60   {
  61     FILE *fp = fdopen (-1, "w");
  62     if (fp != NULL)
  63       {
  64         setvbuf (fp, NULL, _IONBF, 0);
  65         errno = 0;
  66         ASSERT (fputc ('x', fp) == EOF);
  67         ASSERT (errno == EBADF);
  68         ASSERT (ferror (fp));
  69         fclose (fp);
  70       }
  71   }
  72   {
  73     FILE *fp;
  74     close (99);
  75     fp = fdopen (99, "w");
  76     if (fp != NULL)
  77       {
  78         setvbuf (fp, NULL, _IONBF, 0);
  79         errno = 0;
  80         ASSERT (fputc ('x', fp) == EOF);
  81         ASSERT (errno == EBADF);
  82         ASSERT (ferror (fp));
  83         fclose (fp);
  84       }
  85   }
  86
  87   /* Clean up.  */
  88   unlink (filename);
  89
  90   return 0;
  91 }