_strtol.h revision 1.5
1/* $NetBSD: _strtol.h,v 1.5 2013/04/16 21:44:06 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) 45__INT 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 53static __INT 54INT_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) || defined(HAVE_NBTOOL_CONFIG_H) 86 do { 87 c = *s++; 88 } while (isspace(c)); 89#else 90 do { 91 c = *s++; 92 } while (isspace_l(c, loc)); 93#endif 94 if (c == '-') { 95 neg = 1; 96 c = *s++; 97 } else { 98 neg = 0; 99 if (c == '+') 100 c = *s++; 101 } 102 if ((base == 0 || base == 16) && 103 c == '0' && (*s == 'x' || *s == 'X')) { 104 c = s[1]; 105 s += 2; 106 base = 16; 107 } 108 if (base == 0) 109 base = (c == '0' ? 8 : 10); 110 111 /* 112 * Compute the cutoff value between legal numbers and illegal 113 * numbers. That is the largest legal value, divided by the 114 * base. An input number that is greater than this value, if 115 * followed by a legal input character, is too big. One that 116 * is equal to this value may be valid or not; the limit 117 * between valid and invalid numbers is then based on the last 118 * digit. For instance, if the range for longs is 119 * [-2147483648..2147483647] and the input base is 10, 120 * cutoff will be set to 214748364 and cutlim to either 121 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 122 * a value > 214748364, or equal but the next digit is > 7 (or 8), 123 * the number is too big, and we will return a range error. 124 * 125 * Set any if any `digits' consumed; make it negative to indicate 126 * overflow. 127 */ 128 cutoff = (__INT)(neg ? __INT_MIN : __INT_MAX); 129 cutlim = (int)(cutoff % base); 130 cutoff /= base; 131 if (neg) { 132 if (cutlim > 0) { 133 cutlim -= base; 134 cutoff += 1; 135 } 136 cutlim = -cutlim; 137 } 138 for (acc = 0, any = 0;; c = *s++) { 139 if (c >= '0' && c <= '9') 140 i = c - '0'; 141 else if (c >= 'a' && c <= 'z') 142 i = (c - 'a') + 10; 143 else if (c >= 'A' && c <= 'Z') 144 i = (c - 'A') + 10; 145 else 146 break; 147 if (i >= base) 148 break; 149 if (any < 0) 150 continue; 151 if (neg) { 152 if (acc < cutoff || (acc == cutoff && i > cutlim)) { 153 acc = __INT_MIN; 154#if !defined(_KERNEL) && !defined(_STANDALONE) 155 any = -1; 156 errno = ERANGE; 157#else 158 any = 0; 159 break; 160#endif 161 } else { 162 any = 1; 163 acc *= base; 164 acc -= i; 165 } 166 } else { 167 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 168 acc = __INT_MAX; 169#if !defined(_KERNEL) && !defined(_STANDALONE) 170 any = -1; 171 errno = ERANGE; 172#else 173 any = 0; 174 break; 175#endif 176 } else { 177 any = 1; 178 acc *= base; 179 acc += i; 180 } 181 } 182 } 183 if (endptr != NULL) 184 /* LINTED interface specification */ 185 *endptr = __UNCONST(any ? s - 1 : nptr); 186 return(acc); 187} 188 189#if !defined(_KERNEL) && !defined(_STANDALONE) && !defined(HAVE_NBTOOL_CONFIG_H) 190__INT 191_FUNCNAME(const char *nptr, char **endptr, int base) 192{ 193 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, *_current_locale()); 194} 195 196__INT 197INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc) 198{ 199 if (loc == NULL) 200 loc = _C_locale; 201 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc); 202} 203#endif 204