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) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #include "lint.h"
33 #include <ctype.h>
34 #include <sys/types.h>
35 #include <stdlib.h>
36
37 #define ATOL
38
39 #ifdef ATOI
40 typedef int TYPE;
41 #define NAME atoi
42 #else
43 typedef long TYPE;
44 #define NAME atol
45 #endif
46
47 TYPE
NAME(const char * p)48 NAME(const char *p)
49 {
50 TYPE n;
51 int c, neg = 0;
52 unsigned char *up = (unsigned char *)p;
53
54 if (!isdigit(c = *up)) {
55 while (isspace(c))
56 c = *++up;
57 switch (c) {
58 case '-':
59 neg++;
60 /* FALLTHROUGH */
61 case '+':
62 c = *++up;
63 }
64 if (!isdigit(c))
65 return (0);
66 }
67 for (n = '0' - c; isdigit(c = *++up); ) {
68 n *= 10; /* two steps to avoid unnecessary overflow */
69 n += '0' - c; /* accum neg to avoid surprises at MAX */
70 }
71 return (neg ? n : -n);
72 }
73