lib/sh/dprintf.c

   1 /* dprintf -- printf to a file descriptor */
   2
   3 /* Copyright (C) 2008-2010 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #include <stdc.h>
  26
  27 #if defined (HAVE_UNISTD_H)
  28 #  include <unistd.h>
  29 #endif
  30
  31 #if defined (PREFER_STDARG)
  32 #  include <stdarg.h>
  33 #else
  34 #  include <varargs.h>
  35 #endif
  36
  37 #include <stdio.h>
  38
  39 int
  40 #if defined (PREFER_STDARG)
  41 dprintf(int fd, const char *format, ...)
  42 #else
  43 dprintf(fd, format, va_alist)
  44      int fd;
  45      const char *format;
  46      va_dcl
  47 #endif
  48 {
  49   FILE *fp;
  50   int fd2, rc, r2;
  51   va_list args;
  52
  53   if ((fd2 = dup(fd)) < 0)
  54     return -1;
  55   fp = fdopen (fd2, "w");
  56   if (fp == 0)
  57     {
  58       close (fd2);
  59       return -1;
  60     }
  61
  62   SH_VA_START (args, format);
  63   rc = vfprintf (fp, format, args);
  64   fflush (fp);
  65   va_end (args);
  66
  67   r2 = fclose (fp);     /* check here */
  68
  69   return rc;
  70 }