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