1 /* $NetBSD: _strtol.h,v 1.7 2013/05/17 12:55:56 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * Original version ID:
32 * NetBSD: src/lib/libc/locale/_wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp
33 */
34
35 /*
36 * function template for strtol, strtoll and strtoimax.
37 *
38 * parameters:
39 * _FUNCNAME : function name
40 * __INT : return type
41 * __INT_MIN : lower limit of the return type
42 * __INT_MAX : upper limit of the return type
43 */
44 #if defined(_KERNEL) || defined(_STANDALONE) || defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
45 __INT
_FUNCNAME(const char * nptr,char ** endptr,int base)46 _FUNCNAME(const char *nptr, char **endptr, int base)
47 #else
48 #include <locale.h>
49 #include "setlocale_local.h"
50 #define INT_FUNCNAME_(pre, name, post) pre ## name ## post
51 #define INT_FUNCNAME(pre, name, post) INT_FUNCNAME_(pre, name, post)
52
53 static __INT
54 INT_FUNCNAME(_int_, _FUNCNAME, _l)(const char *nptr, char **endptr,
55 int base, locale_t loc)
56 #endif
57 {
58 const char *s;
59 __INT acc, cutoff;
60 unsigned char c;
61 int i, neg, any, cutlim;
62
63 _DIAGASSERT(nptr != NULL);
64 /* endptr may be NULL */
65
66 /* check base value */
67 if (base && (base < 2 || base > 36)) {
68 #if !defined(_KERNEL) && !defined(_STANDALONE)
69 errno = EINVAL;
70 if (endptr != NULL)
71 /* LINTED interface specification */
72 *endptr = __UNCONST(nptr);
73 return 0;
74 #else
75 panic("%s: invalid base %d", __func__, base);
76 #endif
77 }
78
79 /*
80 * Skip white space and pick up leading +/- sign if any.
81 * If base is 0, allow 0x for hex and 0 for octal, else
82 * assume decimal; if base is already 16, allow 0x.
83 */
84 s = nptr;
85 #if defined(_KERNEL) || defined(_STANDALONE) || \
86 defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
87 do {
88 c = *s++;
89 } while (isspace(c));
90 #else
91 do {
92 c = *s++;
93 } while (isspace_l(c, loc));
94 #endif
95 if (c == '-') {
96 neg = 1;
97 c = *s++;
98 } else {
99 neg = 0;
100 if (c == '+')
101 c = *s++;
102 }
103 if ((base == 0 || base == 16) &&
104 c == '0' && (*s == 'x' || *s == 'X')) {
105 c = s[1];
106 s += 2;
107 base = 16;
108 }
109 if (base == 0)
110 base = (c == '0' ? 8 : 10);
111
112 /*
113 * Compute the cutoff value between legal numbers and illegal
114 * numbers. That is the largest legal value, divided by the
115 * base. An input number that is greater than this value, if
116 * followed by a legal input character, is too big. One that
117 * is equal to this value may be valid or not; the limit
118 * between valid and invalid numbers is then based on the last
119 * digit. For instance, if the range for longs is
120 * [-2147483648..2147483647] and the input base is 10,
121 * cutoff will be set to 214748364 and cutlim to either
122 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
123 * a value > 214748364, or equal but the next digit is > 7 (or 8),
124 * the number is too big, and we will return a range error.
125 *
126 * Set any if any `digits' consumed; make it negative to indicate
127 * overflow.
128 */
129 cutoff = (__INT)(neg ? __INT_MIN : __INT_MAX);
130 cutlim = (int)(cutoff % base);
131 cutoff /= base;
132 if (neg) {
133 if (cutlim > 0) {
134 cutlim -= base;
135 cutoff += 1;
136 }
137 cutlim = -cutlim;
138 }
139 for (acc = 0, any = 0;; c = *s++) {
140 if (c >= '0' && c <= '9')
141 i = c - '0';
142 else if (c >= 'a' && c <= 'z')
143 i = (c - 'a') + 10;
144 else if (c >= 'A' && c <= 'Z')
145 i = (c - 'A') + 10;
146 else
147 break;
148 if (i >= base)
149 break;
150 if (any < 0)
151 continue;
152 if (neg) {
153 if (acc < cutoff || (acc == cutoff && i > cutlim)) {
154 acc = __INT_MIN;
155 #if !defined(_KERNEL) && !defined(_STANDALONE)
156 any = -1;
157 errno = ERANGE;
158 #else
159 any = 0;
160 break;
161 #endif
162 } else {
163 any = 1;
164 acc *= base;
165 acc -= i;
166 }
167 } else {
168 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
169 acc = __INT_MAX;
170 #if !defined(_KERNEL) && !defined(_STANDALONE)
171 any = -1;
172 errno = ERANGE;
173 #else
174 any = 0;
175 break;
176 #endif
177 } else {
178 any = 1;
179 acc *= base;
180 acc += i;
181 }
182 }
183 }
184 if (endptr != NULL)
185 /* LINTED interface specification */
186 *endptr = __UNCONST(any ? s - 1 : nptr);
187 return(acc);
188 }
189
190 #if !defined(_KERNEL) && !defined(_STANDALONE) && \
191 !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY)
192 __INT
_FUNCNAME(const char * nptr,char ** endptr,int base)193 _FUNCNAME(const char *nptr, char **endptr, int base)
194 {
195 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale());
196 }
197
198 __INT
199 INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
200 {
201 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
202 }
203 #endif
204