lib/sh-quote.c

   1 /* Shell quoting.
   2    Copyright (C) 2001-2004, 2006, 2009-2017 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 3 of the License, or
   8    (at your option) 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, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "sh-quote.h"
  22
  23 #include <string.h>
  24
  25 #include "quotearg.h"
  26 #include "xalloc.h"
  27
  28 /* Describes quoting for sh compatible shells.  */
  29 static struct quoting_options *sh_quoting_options;
  30
  31 /* Initializes the sh_quoting_options variable.  */
  32 static void
  33 init_sh_quoting_options ()
  34 {
  35   sh_quoting_options = clone_quoting_options (NULL);
  36   set_quoting_style (sh_quoting_options, shell_quoting_style);
  37 }
  38
  39 /* Returns the number of bytes needed for the quoted string.  */
  40 size_t
  41 shell_quote_length (const char *string)
  42 {
  43   if (sh_quoting_options == NULL)
  44     init_sh_quoting_options ();
  45   return quotearg_buffer (NULL, 0, string, strlen (string),
  46                            sh_quoting_options);
  47 }
  48
  49 /* Copies the quoted string to p and returns the incremented p.
  50    There must be room for shell_quote_length (string) + 1 bytes at p.  */
  51 char *
  52 shell_quote_copy (char *p, const char *string)
  53 {
  54   if (sh_quoting_options == NULL)
  55     init_sh_quoting_options ();
  56   return p + quotearg_buffer (p, (size_t)(-1), string, strlen (string),
  57                               sh_quoting_options);
  58 }
  59
  60 /* Returns the freshly allocated quoted string.  */
  61 char *
  62 shell_quote (const char *string)
  63 {
  64   if (sh_quoting_options == NULL)
  65     init_sh_quoting_options ();
  66   return quotearg_alloc (string, strlen (string), sh_quoting_options);
  67 }
  68
  69 /* Returns a freshly allocated string containing all argument strings, quoted,
  70    separated through spaces.  */
  71 char *
  72 shell_quote_argv (char * const *argv)
  73 {
  74   if (*argv != NULL)
  75     {
  76       char * const *argp;
  77       size_t length;
  78       char *command;
  79       char *p;
  80
  81       length = 0;
  82       for (argp = argv; ; )
  83         {
  84           length += shell_quote_length (*argp) + 1;
  85           argp++;
  86           if (*argp == NULL)
  87             break;
  88         }
  89
  90       command = XNMALLOC (length, char);
  91
  92       p = command;
  93       for (argp = argv; ; )
  94         {
  95           p = shell_quote_copy (p, *argp);
  96           argp++;
  97           if (*argp == NULL)
  98             break;
  99           *p++ = ' ';
 100         }
 101       *p = '\0';
 102
 103       return command;
 104     }
 105   else
 106     return xstrdup ("");
 107 }