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 AT&T */
23 /* All Rights Reserved */
24
25 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 2.1 */
26
27 /*LINTLIBRARY*/
28 #include <ctype.h>
29 #define DIGIT(x) (isdigit(x) ? (x) - '0' : \
30 islower(x) ? (x) + 10 - 'a' : (x) + 10 - 'A')
31 #define MBASE ('z' - 'a' + 1 + 10)
32
33 long
strtol(str,ptr,base)34 strtol(str, ptr, base)
35 register char *str;
36 char **ptr;
37 register int base;
38 {
39 register long val;
40 register int c;
41 int xx, neg = 0;
42
43 if (ptr != (char **)0)
44 *ptr = str; /* in case no number is formed */
45 if (base < 0 || base > MBASE)
46 return (0); /* base is invalid -- should be a fatal error */
47 if (!isalnum(c = *str)) {
48 while (isspace(c))
49 c = *++str;
50 switch (c) {
51 case '-':
52 neg++;
53 case '+': /* fall-through */
54 c = *++str;
55 }
56 }
57 if (base == 0)
58 if (c != '0')
59 base = 10;
60 else if (str[1] == 'x' || str[1] == 'X')
61 base = 16;
62 else
63 base = 8;
64 /*
65 * for any base > 10, the digits incrementally following
66 * 9 are assumed to be "abc...z" or "ABC...Z"
67 */
68 if (!isalnum(c) || (xx = DIGIT(c)) >= base)
69 return (0); /* no number formed */
70 if (base == 16 && c == '0' && isxdigit(str[2]) &&
71 (str[1] == 'x' || str[1] == 'X'))
72 c = *(str += 2); /* skip over leading "0x" or "0X" */
73 for (val = -DIGIT(c); isalnum(c = *++str) && (xx = DIGIT(c)) < base; )
74 /* accumulate neg avoids surprises near MAXLONG */
75 val = base * val - xx;
76 if (ptr != (char **)0)
77 *ptr = str;
78 return (neg ? val : -val);
79 }
80