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 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 164 _FUNCNAME(const char * __restrict nptr, char ** __restrict endptr, int base) 165 { 166 return _FUNCNAME_L(nptr, endptr, base, __get_locale()); 167 } 168