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/* Shell command argument quoting.
Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
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; see the file COPYING.
If not, write to the Free Software Foundation,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Paul Eggert <eggert@twinsun.com> */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/types.h>
#include <quotesys.h>
/* Place into QUOTED a quoted version of ARG suitable for `system'.
Return the length of the resulting string (which is not null-terminated).
If QUOTED is null, return the length without any side effects. */
size_t
quote_system_arg (quoted, arg)
char *quoted;
char const *arg;
{
char const *a;
size_t len = 0;
/* Scan ARG, copying it to QUOTED if QUOTED is not null,
looking for shell metacharacters. */
for (a = arg; ; a++)
{
char c = *a;
switch (c)
{
case 0:
/* ARG has no shell metacharacters. */
return len;
case '=':
if (*arg == '-')
break;
/* Fall through. */
case '\t': case '\n': case ' ':
case '!': case '"': case '#': case '$': case '%': case '&': case '\'':
case '(': case ')': case '*': case ';':
case '<': case '>': case '?': case '[': case '\\':
case '^': case '`': case '|': case '~':
{
/* ARG has a shell metacharacter.
Start over, quoting it this time. */
len = 0;
c = *arg++;
/* If ARG is an option, quote just its argument.
This is not necessary, but it looks nicer. */
if (c == '-' && arg < a)
{
c = *arg++;
if (quoted)
{
quoted[len] = '-';
quoted[len + 1] = c;
}
len += 2;
if (c == '-')
while (arg < a)
{
c = *arg++;
if (quoted)
quoted[len] = c;
len++;
if (c == '=')
break;
}
c = *arg++;
}
if (quoted)
quoted[len] = '\'';
len++;
for (; c; c = *arg++)
{
if (c == '\'')
{
if (quoted)
{
quoted[len] = '\'';
quoted[len + 1] = '\\';
quoted[len + 2] = '\'';
}
len += 3;
}
if (quoted)
quoted[len] = c;
len++;
}
if (quoted)
quoted[len] = '\'';
return len + 1;
}
}
if (quoted)
quoted[len] = c;
len++;
}
}
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