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' && (*s == 'x' || *s == 'X')) { 85 c = s[1]; 86 s += 2; 87 base = 16; 88 } 89 if (base == 0) 90 base = c == '0' ? 8 : 10; 91 92 /* 93 * Compute the cutoff value between legal numbers and illegal 94 * numbers. That is the largest legal value, divided by the 95 * base. An input number that is greater than this value, if 96 * followed by a legal input character, is too big. One that 97 * is equal to this value may be valid or not; the limit 98 * between valid and invalid numbers is then based on the last 99 * digit. For instance, if the range for longs is 100 * [-2147483648..2147483647] and the input base is 10, 101 * cutoff will be set to 214748364 and cutlim to either 102 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 103 * a value > 214748364, or equal but the next digit is > 7 (or 8), 104 * the number is too big, and we will return a range error. 105 * 106 * Set any if any `digits' consumed; make it negative to indicate 107 * overflow. 108 */ 109 cutoff = neg ? __INT_MIN : __INT_MAX; 110 cutlim = (int)(cutoff % base); 111 cutoff /= base; 112 if (neg) { 113 if (cutlim > 0) { 114 cutlim -= base; 115 cutoff += 1; 116 } 117 cutlim = -cutlim; 118 } 119 for (acc = 0, any = 0;; c = *s++) { 120 if (!isascii(c)) 121 break; 122 if (isdigit(c)) 123 i = c - '0'; 124 else if (isalpha(c)) 125 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10); 126 else 127 break; 128 if (i >= base) 129 break; 130 if (any < 0) 131 continue; 132 if (neg) { 133 if (acc < cutoff || (acc == cutoff && i > cutlim)) { 134 any = -1; 135 acc = __INT_MIN; 136 errno = ERANGE; 137 } else { 138 any = 1; 139 acc *= base; 140 acc -= i; 141 } 142 } else { 143 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 144 any = -1; 145 acc = __INT_MAX; 146 errno = ERANGE; 147 } else { 148 any = 1; 149 acc *= base; 150 acc += i; 151 } 152 } 153 } 154 if (endptr != NULL) 155 /* LINTED interface specification */ 156 *endptr = __DECONST(char *, (any ? s - 1 : nptr)); 157 return(acc); 158 } 159 160 __INT 161 _FUNCNAME(const char * __restrict nptr, char ** __restrict endptr, int base) 162 { 163 return _FUNCNAME_L(nptr, endptr, base, __get_locale()); 164 } 165