gnu/dist/gettext/gettext-tools/lib/sh-quote.c

   1 /* Shell quoting.
   2    Copyright (C) 2001-2004 Free Software Foundation, Inc.
   3    Written by Bruno Haible <haible@clisp.cons.org>, 2001.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 /* Specification.  */
  24 #include "sh-quote.h"
  25
  26 #include <string.h>
  27
  28 #include "quotearg.h"
  29 #include "xalloc.h"
  30
  31 /* Describes quoting for sh compatible shells.  */
  32 static struct quoting_options *sh_quoting_options;
  33
  34 /* Initializes the sh_quoting_options variable.  */
  35 static void
  36 init_sh_quoting_options ()
  37 {
  38   sh_quoting_options = clone_quoting_options (NULL);
  39   set_quoting_style (sh_quoting_options, shell_quoting_style);
  40 }
  41
  42 /* Returns the number of bytes needed for the quoted string.  */
  43 size_t
  44 shell_quote_length (const char *string)
  45 {
  46   if (sh_quoting_options == NULL)
  47     init_sh_quoting_options ();
  48   return quotearg_buffer (NULL, 0, string, strlen (string),
  49                            sh_quoting_options);
  50 }
  51
  52 /* Copies the quoted string to p and returns the incremented p.
  53    There must be room for shell_quote_length (string) + 1 bytes at p.  */
  54 char *
  55 shell_quote_copy (char *p, const char *string)
  56 {
  57   if (sh_quoting_options == NULL)
  58     init_sh_quoting_options ();
  59   return p + quotearg_buffer (p, (size_t)(-1), string, strlen (string),
  60                               sh_quoting_options);
  61 }
  62
  63 /* Returns the freshly allocated quoted string.  */
  64 char *
  65 shell_quote (const char *string)
  66 {
  67   if (sh_quoting_options == NULL)
  68     init_sh_quoting_options ();
  69   return quotearg_alloc (string, strlen (string), sh_quoting_options);
  70 }
  71
  72 /* Returns a freshly allocated string containing all argument strings, quoted,
  73    separated through spaces.  */
  74 char *
  75 shell_quote_argv (char **argv)
  76 {
  77   if (*argv != NULL)
  78     {
  79       char **argp;
  80       size_t length;
  81       char *command;
  82       char *p;
  83
  84       length = 0;
  85       for (argp = argv; ; )
  86         {
  87           length += shell_quote_length (*argp) + 1;
  88           argp++;
  89           if (*argp == NULL)
  90             break;
  91         }
  92
  93       command = (char *) xmalloc (length);
  94
  95       p = command;
  96       for (argp = argv; ; )
  97         {
  98           p = shell_quote_copy (p, *argp);
  99           argp++;
 100           if (*argp == NULL)
 101             break;
 102           *p++ = ' ';
 103         }
 104       *p = '\0';
 105
 106       return command;
 107     }
 108   else
 109     return xstrdup ("");
 110 }