1 /* $FreeBSD$ */
2 /* $NetBSD: _strtoul.h,v 1.1 2008/08/20 12:42:26 joerg Exp $ */
3
4 /*-
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * Original version ID:
33 * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
34 */
35
36 /*
37 * function template for strtoul, strtoull and strtoumax.
38 *
39 * parameters:
40 * _FUNCNAME : function name
41 * __UINT : return type
42 * __UINT_MAX : upper limit of the return type
43 */
44
45 __UINT
_FUNCNAME(const char * nptr,char ** endptr,int base)46 _FUNCNAME(const char *nptr, char **endptr, int base)
47 {
48 const char *s;
49 __UINT acc, cutoff;
50 unsigned char c;
51 int any, cutlim, i, neg;
52
53 /* check base value */
54 if (base && (base < 2 || base > 36)) {
55 #if !defined(_KERNEL) && !defined(_STANDALONE)
56 errno = EINVAL;
57 return (0);
58 #else
59 panic("%s: invalid base %d", __func__, base);
60 #endif
61 }
62
63 /*
64 * Skip white space and pick up leading +/- sign if any.
65 * If base is 0, allow 0x for hex and 0 for octal, else
66 * assume decimal; if base is already 16, allow 0x.
67 */
68 s = nptr;
69 do {
70 c = *s++;
71 } while (isspace(c));
72 if (c == '-') {
73 neg = 1;
74 c = *s++;
75 } else {
76 neg = 0;
77 if (c == '+')
78 c = *s++;
79 }
80 if ((base == 0 || base == 16) &&
81 c == '0' && (*s == 'x' || *s == 'X')) {
82 c = s[1];
83 s += 2;
84 base = 16;
85 }
86 if (base == 0)
87 base = (c == '0' ? 8 : 10);
88
89 /*
90 * See strtol for comments as to the logic used.
91 */
92 cutoff = __UINT_MAX / (__UINT)base;
93 cutlim = (int)(__UINT_MAX % (__UINT)base);
94 for (acc = 0, any = 0;; c = *s++) {
95 if (isdigit(c))
96 i = c - '0';
97 else if (isalpha(c))
98 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
99 else
100 break;
101 if (i >= base)
102 break;
103 if (any < 0)
104 continue;
105 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
106 acc = __UINT_MAX;
107 #if !defined(_KERNEL) && !defined(_STANDALONE)
108 any = -1;
109 errno = ERANGE;
110 #else
111 any = 0;
112 break;
113 #endif
114 } else {
115 any = 1;
116 acc *= (__UINT)base;
117 acc += i;
118 }
119 }
120 if (neg && any > 0)
121 acc = -acc;
122 if (endptr != NULL)
123 /* LINTED interface specification */
124 *endptr = __DECONST(void *, any ? s - 1 : nptr);
125 return (acc);
126 }
127