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/* Shell quoting.
Copyright (C) 2001-2002 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include "sh-quote.h"
#include <string.h>
#include "strpbrk.h"
#include "xmalloc.h"
#define SHELL_SPECIAL_CHARS "\t\n !\"#$&'()*;<=>?[\\]`{|}~"
/* Returns the number of bytes needed for the quoted string. */
size_t
shell_quote_length (const char *string)
{
if (strpbrk (string, SHELL_SPECIAL_CHARS) == NULL)
return strlen (string);
else
{
char qchar = '\0'; /* last quote character: none or ' or " */
size_t length = 0;
for (; *string != '\0'; string++)
{
char c = *string;
char q = (c == '\'' ? '"' : '\'');
if (qchar != q)
{
if (qchar)
length++;
qchar = q;
length++;
}
length++;
}
if (qchar)
length++;
return length;
}
}
/* Copies the quoted string to p and returns the incremented p. */
char *
shell_quote_copy (char *p, const char *string)
{
if (strpbrk (string, SHELL_SPECIAL_CHARS) == NULL)
{
memcpy (p, string, strlen (string));
return p + strlen (string);
}
else
{
char qchar = '\0'; /* last quote character: none or ' or " */
for (; *string != '\0'; string++)
{
char c = *string;
char q = (c == '\'' ? '"' : '\'');
if (qchar != q)
{
if (qchar)
*p++ = qchar;
qchar = q;
*p++ = qchar;
}
*p++ = c;
}
if (qchar)
*p++ = qchar;
return p;
}
}
/* Returns the freshly allocated quoted string. */
char *
shell_quote (const char *string)
{
size_t length = shell_quote_length (string);
char *quoted = (char *) xmalloc (length + 1);
char *p = shell_quote_copy (quoted, string);
*p = '\0';
return quoted;
}
/* Returns a freshly allocated string containing all argument strings, quoted,
separated through spaces. */
char *
shell_quote_argv (char **argv)
{
if (*argv != NULL)
{
char **argp;
size_t length;
char *command;
char *p;
length = 0;
for (argp = argv; ; )
{
length += shell_quote_length (*argp) + 1;
argp++;
if (*argp == NULL)
break;
}
command = (char *) xmalloc (length);
p = command;
for (argp = argv; ; )
{
p = shell_quote_copy (p, *argp);
argp++;
if (*argp == NULL)
break;
*p++ = ' ';
}
*p = '\0';
return command;
}
else
return xstrdup ("");
}
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