lib/printquoted.c

   1 /* printquoted.c -- print a specified string with any necessary quoting.
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 2000, 2003, 2004, 2005,
   4                  2007, 2009, 2010 Free Software Foundation, Inc.
   5
   6    This program is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation, either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <config.h>
  21
  22
  23 #include <stddef.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26
  27
  28 #include "xalloc.h"
  29 #include "printquoted.h"
  30
  31
  32 /*
  33  * Print S according to the format FORMAT, but if the destination is a tty,
  34  * convert any potentially-dangerous characters.  The logic in this function
  35  * was taken from ls.c in coreutils (at Sun Jun  5 20:42:51 2005 UTC).
  36  */
  37 int
  38 print_quoted (FILE *fp,
  39               const struct quoting_options *qopts,
  40               bool dest_is_tty,
  41               const char *format,
  42               const char *s)
  43 {
  44   int rv;
  45
  46   if (dest_is_tty)
  47     {
  48       char smallbuf[BUFSIZ];
  49       size_t len = quotearg_buffer (smallbuf, sizeof smallbuf, s, -1, qopts);
  50       char *buf;
  51       if (len < sizeof smallbuf)
  52         buf = smallbuf;
  53       else
  54         {
  55           /* The original coreutils code uses alloca(), but I don't
  56            * want to take on the anguish of introducing alloca() to
  57            * 'find'.
  58            * XXX: newsflash: we already have alloca().
  59            */
  60           buf = xmalloc (len + 1);
  61           quotearg_buffer (buf, len + 1, s, -1, qopts);
  62         }
  63
  64       /* Replace any remaining funny characters with '?'. */
  65       len = qmark_chars (buf, len);
  66
  67       rv = fprintf (fp, format, buf);   /* Print the quoted version */
  68       if (buf != smallbuf)
  69         {
  70           free (buf);
  71           buf = NULL;
  72         }
  73     }
  74   else
  75     {
  76       /* no need to quote things. */
  77       rv = fprintf (fp, format, s);
  78     }
  79   return rv;
  80 }