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 2011 Nexenta Systems, Inc. All rights reserved.
24 */
25
26/*
27 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
28 * Use is subject to license terms.
29 */
30
31/*	Copyright (c) 1988 AT&T	*/
32/*	  All Rights Reserved  	*/
33
34#if	defined(_KERNEL) && !defined(_BOOT)
35#include <sys/errno.h>
36#else	/* _KERNEL && !_BOOT */
37#if	!defined(_BOOT) && !defined(_KMDB)
38#include "lint.h"
39#endif	/* !_BOOT && !_KMDB */
40#include <errno.h>
41#include <ctype.h>
42#include <limits.h>
43#include <stdlib.h>
44#endif	/* _KERNEL && !_BOOT */
45#include "strtolctype.h"
46#include <sys/types.h>
47
48#if	defined(_KERNEL) && !defined(_BOOT)
49int
50ddi_strtol(const char *str, char **nptr, int base, long *result)
51#else	/* _KERNEL && !_BOOT */
52long
53strtol(const char *str, char **nptr, int base)
54#endif	/* _KERNEL && !_BOOT */
55{
56	long val;
57	int c;
58	int xx;
59	int neg = 0;
60	long multmin;
61	long limit;
62	const char **ptr = (const char **)nptr;
63	const unsigned char *ustr = (const unsigned char *)str;
64
65	if (ptr != (const char **)0)
66		*ptr = (char *)ustr; /* in case no number is formed */
67	if (base < 0 || base > MBASE || base == 1) {
68		/* base is invalid -- should be a fatal error */
69#if	defined(_KERNEL) && !defined(_BOOT)
70		return (EINVAL);
71#else	/* _KERNEL && !_BOOT */
72		errno = EINVAL;
73		return (0);
74#endif	/* _KERNEL && !_BOOT */
75	}
76	if (!isalnum(c = *ustr)) {
77		while (isspace(c))
78			c = *++ustr;
79		switch (c) {
80		case '-':
81			neg++;
82			/* FALLTHROUGH */
83		case '+':
84			c = *++ustr;
85		}
86	}
87	if (base == 0)
88		if (c != '0')
89			base = 10;
90		else if (ustr[1] == 'x' || ustr[1] == 'X')
91			base = 16;
92		else
93			base = 8;
94	/*
95	 * for any base > 10, the digits incrementally following
96	 *	9 are assumed to be "abc...z" or "ABC...Z"
97	 */
98	if (!lisalnum(c) || (xx = DIGIT(c)) >= base) {
99		/* no number formed */
100#if	defined(_KERNEL) && !defined(_BOOT)
101		return (EINVAL);
102#else	/* _KERNEL && !_BOOT */
103		errno = EINVAL;
104		return (0);
105#endif	/* _KERNEL && !_BOOT */
106	}
107	if (base == 16 && c == '0' && (ustr[1] == 'x' || ustr[1] == 'X') &&
108	    isxdigit(ustr[2]))
109		c = *(ustr += 2); /* skip over leading "0x" or "0X" */
110
111	/* this code assumes that abs(LONG_MIN) >= abs(LONG_MAX) */
112	if (neg)
113		limit = LONG_MIN;
114	else
115		limit = -LONG_MAX;
116	multmin = limit / (long)base;
117	val = -DIGIT(c);
118	for (c = *++ustr; lisalnum(c) && (xx = DIGIT(c)) < base; ) {
119		/* accumulate neg avoids surprises near LONG_MAX */
120		if (val < multmin)
121			goto overflow;
122		val *= base;
123		if (val < limit + xx)
124			goto overflow;
125		val -= xx;
126		c = *++ustr;
127	}
128	if (ptr != (const char **)0)
129		*ptr = (char *)ustr;
130#if	defined(_KERNEL) && !defined(_BOOT)
131	*result = neg ? val : -val;
132	return (0);
133#else	/* _KERNEL && !_BOOT */
134	return (neg ? val : -val);
135#endif	/* _KERNEL && !_BOOT */
136
137overflow:
138	for (c = *++ustr; lisalnum(c) && (xx = DIGIT(c)) < base; (c = *++ustr))
139		;
140	if (ptr != (const char **)0)
141		*ptr = (char *)ustr;
142#if	defined(_KERNEL) && !defined(_BOOT)
143	return (ERANGE);
144#else	/* _KERNEL && !_BOOT */
145	errno = ERANGE;
146	return (neg ? LONG_MIN : LONG_MAX);
147#endif	/* _KERNEL && !_BOOT */
148}
149