xref: /illumos-gate/usr/src/cmd/mail/getarg.c (revision d66189afcff4d8c96fe714e9a51f9819138a1ea1)
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 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23 /*	  All Rights Reserved  	*/
24 
25 #include "mail.h"
26 /*
27 	get next token
28 		p	-> string to be searched
29 		s	-> area to return token
30 	returns:
31 		p	-> updated string pointer
32 		s	-> token
33 		NULL	-> no token
34 */
35 char *
36 getarg(s, p)
37 register char *s, *p;
38 {
39 	while (*p == ' ' || *p == '\t') p++;
40 	if (*p == '\n' || *p == '\0') return(NULL);
41 	while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') *s++ = *p++;
42 	*s = '\0';
43 	return(p);
44 }
45