1219019Sgabor/* $FreeBSD$ */ 2219019Sgabor/* $NetBSD: _strtoul.h,v 1.1 2008/08/20 12:42:26 joerg Exp $ */ 3219019Sgabor 4219019Sgabor/*- 5219019Sgabor * Copyright (c) 1990, 1993 6219019Sgabor * The Regents of the University of California. All rights reserved. 7219019Sgabor * 8219019Sgabor * Redistribution and use in source and binary forms, with or without 9219019Sgabor * modification, are permitted provided that the following conditions 10219019Sgabor * are met: 11219019Sgabor * 1. Redistributions of source code must retain the above copyright 12219019Sgabor * notice, this list of conditions and the following disclaimer. 13219019Sgabor * 2. Redistributions in binary form must reproduce the above copyright 14219019Sgabor * notice, this list of conditions and the following disclaimer in the 15219019Sgabor * documentation and/or other materials provided with the distribution. 16219019Sgabor * 3. Neither the name of the University nor the names of its contributors 17219019Sgabor * may be used to endorse or promote products derived from this software 18219019Sgabor * without specific prior written permission. 19219019Sgabor * 20219019Sgabor * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21219019Sgabor * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22219019Sgabor * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23219019Sgabor * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24219019Sgabor * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25219019Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26219019Sgabor * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27219019Sgabor * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28219019Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29219019Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30219019Sgabor * SUCH DAMAGE. 31219019Sgabor * 32219019Sgabor * Original version ID: 33219019Sgabor * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp 34219019Sgabor */ 35219019Sgabor 36219019Sgabor/* 37219019Sgabor * function template for strtoul, strtoull and strtoumax. 38219019Sgabor * 39219019Sgabor * parameters: 40219019Sgabor * _FUNCNAME : function name 41219019Sgabor * __UINT : return type 42219019Sgabor * __UINT_MAX : upper limit of the return type 43219019Sgabor */ 44219019Sgabor 45219019Sgabor__UINT 46219019Sgabor_FUNCNAME(const char *nptr, char **endptr, int base) 47219019Sgabor{ 48219019Sgabor const char *s; 49219019Sgabor __UINT acc, cutoff; 50219019Sgabor unsigned char c; 51219019Sgabor int any, cutlim, i, neg; 52219019Sgabor 53219019Sgabor /* check base value */ 54219019Sgabor if (base && (base < 2 || base > 36)) { 55219019Sgabor#if !defined(_KERNEL) && !defined(_STANDALONE) 56219019Sgabor errno = EINVAL; 57219019Sgabor return (0); 58219019Sgabor#else 59219019Sgabor panic("%s: invalid base %d", __func__, base); 60219019Sgabor#endif 61219019Sgabor } 62219019Sgabor 63219019Sgabor /* 64219019Sgabor * Skip white space and pick up leading +/- sign if any. 65219019Sgabor * If base is 0, allow 0x for hex and 0 for octal, else 66219019Sgabor * assume decimal; if base is already 16, allow 0x. 67219019Sgabor */ 68219019Sgabor s = nptr; 69219019Sgabor do { 70219019Sgabor c = *s++; 71219019Sgabor } while (isspace(c)); 72219019Sgabor if (c == '-') { 73219019Sgabor neg = 1; 74219019Sgabor c = *s++; 75219019Sgabor } else { 76219019Sgabor neg = 0; 77219019Sgabor if (c == '+') 78219019Sgabor c = *s++; 79219019Sgabor } 80219019Sgabor if ((base == 0 || base == 16) && 81219019Sgabor c == '0' && (*s == 'x' || *s == 'X')) { 82219019Sgabor c = s[1]; 83219019Sgabor s += 2; 84219019Sgabor base = 16; 85219019Sgabor } 86219019Sgabor if (base == 0) 87219019Sgabor base = (c == '0' ? 8 : 10); 88219019Sgabor 89219019Sgabor /* 90219019Sgabor * See strtol for comments as to the logic used. 91219019Sgabor */ 92219019Sgabor cutoff = __UINT_MAX / (__UINT)base; 93219019Sgabor cutlim = (int)(__UINT_MAX % (__UINT)base); 94219019Sgabor for (acc = 0, any = 0;; c = *s++) { 95219019Sgabor if (isdigit(c)) 96219019Sgabor i = c - '0'; 97219019Sgabor else if (isalpha(c)) 98219019Sgabor i = c - (isupper(c) ? 'A' - 10 : 'a' - 10); 99219019Sgabor else 100219019Sgabor break; 101219019Sgabor if (i >= base) 102219019Sgabor break; 103219019Sgabor if (any < 0) 104219019Sgabor continue; 105219019Sgabor if (acc > cutoff || (acc == cutoff && i > cutlim)) { 106219019Sgabor acc = __UINT_MAX; 107219019Sgabor#if !defined(_KERNEL) && !defined(_STANDALONE) 108219019Sgabor any = -1; 109219019Sgabor errno = ERANGE; 110219019Sgabor#else 111219019Sgabor any = 0; 112219019Sgabor break; 113219019Sgabor#endif 114219019Sgabor } else { 115219019Sgabor any = 1; 116219019Sgabor acc *= (__UINT)base; 117219019Sgabor acc += i; 118219019Sgabor } 119219019Sgabor } 120219019Sgabor if (neg && any > 0) 121219019Sgabor acc = -acc; 122219019Sgabor if (endptr != NULL) 123219019Sgabor /* LINTED interface specification */ 124219019Sgabor *endptr = __DECONST(void *, any ? s - 1 : nptr); 125219019Sgabor return (acc); 126219019Sgabor} 127