lib/xprintf.c

   1 /* printf wrappers that fail immediately for non-file-related errors
   2    Copyright (C) 2007, 2009-2018 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 of the License, or
   7    (at your option) 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 <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include "xprintf.h"
  20
  21 #include <errno.h>
  22
  23 #include "error.h"
  24 #include "exitfail.h"
  25 #include "gettext.h"
  26
  27 /* written by Jim Meyering */
  28
  29 /* Just like printf, but call error if it fails without setting the
  30    stream's error indicator.  */
  31 int
  32 xprintf (char const *restrict format, ...)
  33 {
  34   va_list args;
  35   int retval;
  36   va_start (args, format);
  37   retval = xvprintf (format, args);
  38   va_end (args);
  39
  40   return retval;
  41 }
  42
  43 /* Just like vprintf, but call error if it fails without setting the
  44    stream's error indicator.  */
  45 int
  46 xvprintf (char const *restrict format, va_list args)
  47 {
  48   int retval = vprintf (format, args);
  49   if (retval < 0 && ! ferror (stdout))
  50     error (exit_failure, errno, gettext ("cannot perform formatted output"));
  51
  52   return retval;
  53 }
  54
  55 /* Just like fprintf, but call error if it fails without setting the
  56    stream's error indicator.  */
  57 int
  58 xfprintf (FILE *restrict stream, char const *restrict format, ...)
  59 {
  60   va_list args;
  61   int retval;
  62   va_start (args, format);
  63   retval = xvfprintf (stream, format, args);
  64   va_end (args);
  65
  66   return retval;
  67 }
  68
  69 /* Just like vfprintf, but call error if it fails without setting the
  70    stream's error indicator.  */
  71 int
  72 xvfprintf (FILE *restrict stream, char const *restrict format, va_list args)
  73 {
  74   int retval = vfprintf (stream, format, args);
  75   if (retval < 0 && ! ferror (stream))
  76     error (exit_failure, errno, gettext ("cannot perform formatted output"));
  77
  78   return retval;
  79 }