8322 nl: misleading-indentation
[unleashed/tickless.git] / usr / src / common / util / strtoul.c
blob3b1eff90c1d51130a3bdee0377d8f615166e0031
1 /*
2 * CDDL HEADER START
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.
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.
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]
19 * CDDL HEADER END
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
30 #if defined(_KERNEL) && !defined(_BOOT)
31 #include <sys/errno.h>
32 #else /* _KERNEL && !_BOOT */
33 #if !defined(_BOOT) && !defined(_KMDB)
34 #include "lint.h"
35 #endif /* !_BOOT && !_KMDB */
36 #include <errno.h>
37 #include <ctype.h>
38 #include <limits.h>
39 #include <stdlib.h>
40 #endif /* _KERNEL && !_BOOT */
41 #include "strtolctype.h"
42 #include <sys/types.h>
44 #if defined(_KERNEL) && !defined(_BOOT)
45 int
46 ddi_strtoul(const char *str, char **nptr, int base, unsigned long *result)
47 #else /* _KERNEL && !_BOOT */
48 unsigned long
49 strtoul(const char *str, char **nptr, int base)
50 #endif /* _KERNEL && !_BOOT */
52 unsigned long val;
53 int c;
54 int xx;
55 int neg = 0;
56 unsigned long multmax;
57 const char **ptr = (const char **)nptr;
58 const unsigned char *ustr = (const unsigned char *)str;
60 if (ptr != (const char **)0)
61 *ptr = (char *)ustr; /* in case no number is formed */
62 if (base < 0 || base > MBASE || base == 1) {
63 /* base is invalid -- should be a fatal error */
64 #if defined(_KERNEL) && !defined(_BOOT)
65 return (EINVAL);
66 #else /* _KERNEL && !_BOOT */
67 errno = EINVAL;
68 return (0);
69 #endif /* _KERNEL && !_BOOT */
71 if (!isalnum(c = *ustr)) {
72 while (isspace(c))
73 c = *++ustr;
74 switch (c) {
75 case '-':
76 neg++;
77 /* FALLTHROUGH */
78 case '+':
79 c = *++ustr;
82 if (base == 0)
83 if (c != '0')
84 base = 10;
85 else if (ustr[1] == 'x' || ustr[1] == 'X')
86 base = 16;
87 else
88 base = 8;
90 * for any base > 10, the digits incrementally following
91 * 9 are assumed to be "abc...z" or "ABC...Z"
93 if (!lisalnum(c) || (xx = DIGIT(c)) >= base) {
94 /* no number formed */
95 #if defined(_KERNEL) && !defined(_BOOT)
96 return (EINVAL);
97 #else /* _KERNEL && !_BOOT */
98 return (0);
99 #endif /* _KERNEL && !_BOOT */
101 if (base == 16 && c == '0' && (ustr[1] == 'x' || ustr[1] == 'X') &&
102 isxdigit(ustr[2]))
103 c = *(ustr += 2); /* skip over leading "0x" or "0X" */
105 multmax = ULONG_MAX / (unsigned long)base;
106 val = DIGIT(c);
107 for (c = *++ustr; lisalnum(c) && (xx = DIGIT(c)) < base; ) {
108 if (val > multmax)
109 goto overflow;
110 val *= base;
111 if (ULONG_MAX - val < xx)
112 goto overflow;
113 val += xx;
114 c = *++ustr;
116 if (ptr != (const char **)0)
117 *ptr = (char *)ustr;
118 #if defined(_KERNEL) && !defined(_BOOT)
119 *result = neg ? -val : val;
120 return (0);
121 #else /* _KERNEL && !_BOOT */
122 return (neg ? -val : val);
123 #endif /* _KERNEL && !_BOOT */
125 overflow:
126 for (c = *++ustr; lisalnum(c) && (xx = DIGIT(c)) < base; (c = *++ustr))
128 if (ptr != (const char **)0)
129 *ptr = (char *)ustr;
130 #if defined(_KERNEL) && !defined(_BOOT)
131 return (ERANGE);
132 #else /* _KERNEL && !_BOOT */
133 errno = ERANGE;
134 return (ULONG_MAX);
135 #endif /* _KERNEL && !_BOOT */