1 /* $NetBSD: _strtol.h,v 1.11 2017/07/06 21:08:44 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 ((s[1] >= '0' && s[1] <= '9') ||
106 (s[1] >= 'a' && s[1] <= 'f') ||
107 (s[1] >= 'A' && s[1] <= 'F'))) {
108 c = s[1];
109 s += 2;
110 base = 16;
111 #if 0
112 } else if ((base == 0 || base == 2) &&
113 c == '0' && (*s == 'b' || *s == 'B') &&
114 (s[1] >= '0' && s[1] <= '1')) {
115 c = s[1];
116 s += 2;
117 base = 2;
118 #endif
119 } else if (base == 0)
120 base = (c == '0' ? 8 : 10);
121
122 /*
123 * Compute the cutoff value between legal numbers and illegal
124 * numbers. That is the largest legal value, divided by the
125 * base. An input number that is greater than this value, if
126 * followed by a legal input character, is too big. One that
127 * is equal to this value may be valid or not; the limit
128 * between valid and invalid numbers is then based on the last
129 * digit. For instance, if the range for longs is
130 * [-2147483648..2147483647] and the input base is 10,
131 * cutoff will be set to 214748364 and cutlim to either
132 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
133 * a value > 214748364, or equal but the next digit is > 7 (or 8),
134 * the number is too big, and we will return a range error.
135 *
136 * Set any if any `digits' consumed; make it negative to indicate
137 * overflow.
138 */
139 cutoff = (__INT)(neg ? __INT_MIN : __INT_MAX);
140 cutlim = (int)(cutoff % base);
141 cutoff /= base;
142 if (neg) {
143 if (cutlim > 0) {
144 cutlim -= base;
145 cutoff += 1;
146 }
147 cutlim = -cutlim;
148 }
149 for (acc = 0, any = 0;; c = *s++) {
150 if (c >= '0' && c <= '9')
151 i = c - '0';
152 else if (c >= 'a' && c <= 'z')
153 i = (c - 'a') + 10;
154 else if (c >= 'A' && c <= 'Z')
155 i = (c - 'A') + 10;
156 else
157 break;
158 if (i >= base)
159 break;
160 if (any < 0)
161 continue;
162 if (neg) {
163 if (acc < cutoff || (acc == cutoff && i > cutlim)) {
164 acc = __INT_MIN;
165 #if !defined(_KERNEL) && !defined(_STANDALONE)
166 any = -1;
167 errno = ERANGE;
168 #else
169 any = 0;
170 break;
171 #endif
172 } else {
173 any = 1;
174 acc *= base;
175 acc -= i;
176 }
177 } else {
178 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
179 acc = __INT_MAX;
180 #if !defined(_KERNEL) && !defined(_STANDALONE)
181 any = -1;
182 errno = ERANGE;
183 #else
184 any = 0;
185 break;
186 #endif
187 } else {
188 any = 1;
189 acc *= base;
190 acc += i;
191 }
192 }
193 }
194 if (endptr != NULL)
195 /* LINTED interface specification */
196 *endptr = __UNCONST(any ? s - 1 : nptr);
197 return(acc);
198 }
199
200 #if !defined(_KERNEL) && !defined(_STANDALONE) && \
201 !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY)
202 __INT
_FUNCNAME(const char * nptr,char ** endptr,int base)203 _FUNCNAME(const char *nptr, char **endptr, int base)
204 {
205 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale());
206 }
207
208 __INT
209 INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
210 {
211 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
212 }
213 #endif
214