setup_exec.c revision e8031f0a8ed0e45c6d8847c5e09424e66fd34a4b
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
24/*	  All Rights Reserved  	*/
25
26/*
27 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
28 * Use is subject to license terms.
29 */
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32/*LINTLIBRARY*/
33
34#include "c_synonyms.h"
35#include <sys/types.h>
36#include <ctype.h>
37#include "libmail.h"
38
39#define	TRUE	1
40#define	FALSE	0
41
42char **
43setup_exec(char *s)
44{
45	char	*p = s, *q;
46	static char	*argvec[256]; /* is this enough? */
47	int	i = 0;
48	int	stop;
49	int	ignorespace = FALSE;
50
51	/* Parse up string into arg. vec. for subsequent exec. Assume */
52	/* whitespace delimits args. Any non-escaped double quotes will */
53	/* be used to group multiple whitespace-delimited tokens into */
54	/* a single exec arg. */
55	p = skipspace(p);
56	while (*p) {
57		q = p;
58		stop = FALSE;
59		while (*q && (stop == FALSE)) {
60		    again:
61			switch (*q) {
62			case '\\':
63				/* Slide command string 1 char to left */
64				strmove(q, q+1);
65				break;
66			case '"':
67				ignorespace = ((ignorespace == TRUE) ?
68								FALSE : TRUE);
69				/* Slide command string 1 char to left */
70				strmove(q, q+1);
71				goto again;
72			default:
73				if (isspace((int)*q) &&
74				    (ignorespace == FALSE)) {
75					stop = TRUE;
76					continue;
77				}
78				break;
79			}
80			q++;
81		}
82		if (*q == '\0') {
83			argvec[i++] = p;
84			break;
85		}
86		*q++ = '\0';
87		argvec[i++] = p;
88		p = skipspace(q);
89	}
90	argvec[i] = NULL;
91	if (i == 0) {
92		return (NULL);
93	}
94	return (argvec);
95}
96