126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/* Shell command argument quoting.
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Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Paul Eggert <eggert@twinsun.com> */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <quotesys.h>
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/* Place into QUOTED a quoted version of ARG suitable for `system'.
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Return the length of the resulting string (which is not null-terminated).
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If QUOTED is null, return the length without any side effects. */
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size_t
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quote_system_arg (quoted, arg)
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char *quoted;
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char const *arg;
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{
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char const *a;
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size_t len = 0;
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/* Scan ARG, copying it to QUOTED if QUOTED is not null,
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looking for shell metacharacters. */
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for (a = arg; ; a++)
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{
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char c = *a;
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switch (c)
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{
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case 0:
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/* ARG has no shell metacharacters. */
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return len;
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case '=':
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if (*arg == '-')
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break;
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/* Fall through. */
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case '\t': case '\n': case ' ':
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case '!': case '"': case '#': case '$': case '%': case '&': case '\'':
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case '(': case ')': case '*': case ';':
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case '<': case '>': case '?': case '[': case '\\':
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case '^': case '`': case '|': case '~':
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{
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/* ARG has a shell metacharacter.
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Start over, quoting it this time. */
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len = 0;
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c = *arg++;
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/* If ARG is an option, quote just its argument.
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This is not necessary, but it looks nicer. */
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if (c == '-' && arg < a)
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{
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c = *arg++;
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if (quoted)
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{
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quoted[len] = '-';
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quoted[len + 1] = c;
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}
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len += 2;
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if (c == '-')
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while (arg < a)
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{
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c = *arg++;
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if (quoted)
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quoted[len] = c;
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len++;
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if (c == '=')
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break;
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}
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c = *arg++;
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}
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if (quoted)
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quoted[len] = '\'';
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len++;
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for (; c; c = *arg++)
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{
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if (c == '\'')
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{
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if (quoted)
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{
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quoted[len] = '\'';
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quoted[len + 1] = '\\';
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quoted[len + 2] = '\'';
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}
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len += 3;
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}
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if (quoted)
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quoted[len] = c;
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len++;
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}
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if (quoted)
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quoted[len] = '\'';
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return len + 1;
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}
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}
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if (quoted)
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quoted[len] = c;
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len++;
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}
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}
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