lib/printquoted.c

   1 /* printquoted.c -- print a specified string with any necessary quoting.
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 2000,
   4                  2003, 2004, 2005 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 2, or (at your option)
   9    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, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19    USA.
  20 */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stddef.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29
  30 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth().  */
  31 #if HAVE_WCHAR_H
  32 # include <wchar.h>
  33 #endif
  34
  35
  36
  37 #include "xalloc.h"
  38 #include "printquoted.h"
  39
  40
  41 /*
  42  * Print S according to the format FORMAT, but if the destination is a tty,
  43  * convert any potentially-dangerous characters.  The logic in this function
  44  * was taken from ls.c in coreutils (at Sun Jun  5 20:42:51 2005 UTC).
  45  */
  46 void
  47 print_quoted (FILE *fp,
  48               const struct quoting_options *qopts,
  49               bool dest_is_tty,
  50               const char *format,
  51               const char *s)
  52 {
  53   if (dest_is_tty)
  54     {
  55       char smallbuf[BUFSIZ];
  56       size_t len = quotearg_buffer (smallbuf, sizeof smallbuf, s, -1, qopts);
  57       char *buf;
  58       if (len < sizeof smallbuf)
  59         buf = smallbuf;
  60       else
  61         {
  62           /* The original coreutils code uses alloca(), but I don't
  63            * want to take on the anguish of introducing alloca() to
  64            * 'find'.
  65            * XXX: newsflash: we already have alloca().
  66            */
  67           buf = xmalloc (len + 1);
  68           quotearg_buffer (buf, len + 1, s, -1, qopts);
  69         }
  70
  71       /* Replace any remaining funny characters with '?'. */
  72       len = qmark_chars(buf, len);
  73
  74       fprintf(fp, format, buf); /* Print the quoted version */
  75       if (buf != smallbuf)
  76         {
  77           free(buf);
  78           buf = NULL;
  79         }
  80     }
  81   else
  82     {
  83       /* no need to quote things. */
  84       fprintf(fp, format, s);
  85     }
  86
  87 }
  88