1 /* $NetBSD: _strtol.h,v 1.10 2015/11/13 16:02:07 christos 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 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 c = s[1]; 106 s += 2; 107 base = 16; 108 #if 0 109 } else if ((base == 0 || base == 2) && 110 c == '0' && (*s == 'b' || *s == 'B')) { 111 c = s[1]; 112 s += 2; 113 base = 2; 114 #endif 115 } else if (base == 0) 116 base = (c == '0' ? 8 : 10); 117 118 /* 119 * Compute the cutoff value between legal numbers and illegal 120 * numbers. That is the largest legal value, divided by the 121 * base. An input number that is greater than this value, if 122 * followed by a legal input character, is too big. One that 123 * is equal to this value may be valid or not; the limit 124 * between valid and invalid numbers is then based on the last 125 * digit. For instance, if the range for longs is 126 * [-2147483648..2147483647] and the input base is 10, 127 * cutoff will be set to 214748364 and cutlim to either 128 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 129 * a value > 214748364, or equal but the next digit is > 7 (or 8), 130 * the number is too big, and we will return a range error. 131 * 132 * Set any if any `digits' consumed; make it negative to indicate 133 * overflow. 134 */ 135 cutoff = (__INT)(neg ? __INT_MIN : __INT_MAX); 136 cutlim = (int)(cutoff % base); 137 cutoff /= base; 138 if (neg) { 139 if (cutlim > 0) { 140 cutlim -= base; 141 cutoff += 1; 142 } 143 cutlim = -cutlim; 144 } 145 for (acc = 0, any = 0;; c = *s++) { 146 if (c >= '0' && c <= '9') 147 i = c - '0'; 148 else if (c >= 'a' && c <= 'z') 149 i = (c - 'a') + 10; 150 else if (c >= 'A' && c <= 'Z') 151 i = (c - 'A') + 10; 152 else 153 break; 154 if (i >= base) 155 break; 156 if (any < 0) 157 continue; 158 if (neg) { 159 if (acc < cutoff || (acc == cutoff && i > cutlim)) { 160 acc = __INT_MIN; 161 #if !defined(_KERNEL) && !defined(_STANDALONE) 162 any = -1; 163 errno = ERANGE; 164 #else 165 any = 0; 166 break; 167 #endif 168 } else { 169 any = 1; 170 acc *= base; 171 acc -= i; 172 } 173 } else { 174 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 175 acc = __INT_MAX; 176 #if !defined(_KERNEL) && !defined(_STANDALONE) 177 any = -1; 178 errno = ERANGE; 179 #else 180 any = 0; 181 break; 182 #endif 183 } else { 184 any = 1; 185 acc *= base; 186 acc += i; 187 } 188 } 189 } 190 if (endptr != NULL) 191 /* LINTED interface specification */ 192 *endptr = __UNCONST(any ? s - 1 : nptr); 193 return(acc); 194 } 195 196 #if !defined(_KERNEL) && !defined(_STANDALONE) && \ 197 !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY) 198 __INT 199 _FUNCNAME(const char *nptr, char **endptr, int base) 200 { 201 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale()); 202 } 203 204 __INT 205 INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc) 206 { 207 return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc); 208 } 209 #endif 210