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
26 #ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.5 */
27 /*
28 Place the `len' length substring of `as' starting at `as[origin]'
29 in `aresult'.
30 Return `aresult'.
31
32 Note: The copying of as to aresult stops if either the
33 specified number (len) characters have been copied,
34 or if the end of as is found.
35 A negative len generally guarantees that everything gets copied.
36 */
37
substr(as,aresult,origin,len)38 char *substr(as, aresult, origin, len)
39 char *as, *aresult;
40 int origin;
41 register unsigned len;
42 {
43 register char *s, *result;
44
45 s = as + origin;
46 result = aresult;
47 ++len;
48 while (--len && (*result++ = *s++)) ;
49 if (len == 0)
50 *result = 0;
51 return(aresult);
52 }
53