setup_exec.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include <sys/types.h>
33#include <ctype.h>
34#include "libmail.h"
35
36#define	TRUE	1
37#define	FALSE	0
38
39char **
40setup_exec(char *s)
41{
42	char	*p = s, *q;
43	static char	*argvec[256]; /* is this enough? */
44	int	i = 0;
45	int	stop;
46	int	ignorespace = FALSE;
47
48	/* Parse up string into arg. vec. for subsequent exec. Assume */
49	/* whitespace delimits args. Any non-escaped double quotes will */
50	/* be used to group multiple whitespace-delimited tokens into */
51	/* a single exec arg. */
52	p = skipspace(p);
53	while (*p) {
54		q = p;
55		stop = FALSE;
56		while (*q && (stop == FALSE)) {
57		again:
58			switch (*q) {
59			case '\\':
60				/* Slide command string 1 char to left */
61				strmove(q, q+1);
62				break;
63			case '"':
64				ignorespace = ((ignorespace == TRUE) ?
65				    FALSE : TRUE);
66				/* Slide command string 1 char to left */
67				strmove(q, q+1);
68				goto again;
69			default:
70				if (isspace((int)*q) &&
71				    (ignorespace == FALSE)) {
72					stop = TRUE;
73					continue;
74				}
75				break;
76			}
77			q++;
78		}
79		if (*q == '\0') {
80			argvec[i++] = p;
81			break;
82		}
83		*q++ = '\0';
84		argvec[i++] = p;
85		p = skipspace(q);
86	}
87	argvec[i] = NULL;
88	if (i == 0) {
89		return (NULL);
90	}
91	return (argvec);
92}
93