1 /* $FreeBSD: head/lib/libc/iconv/_strtoul.h 219019 2011-02-25 00:04:39Z gabor $ */ 2 /* $NetBSD: _strtoul.h,v 1.1 2008/08/20 12:42:26 joerg Exp $ */ 3 4 /*- 5 * Copyright (c) 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * Original version ID: 33 * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp 34 */ 35 36 /* 37 * function template for strtoul, strtoull and strtoumax. 38 * 39 * parameters: 40 * _FUNCNAME : function name 41 * __UINT : return type 42 * UINT_MAX : upper limit of the return type 43 */ 44 45 __UINT 46 _FUNCNAME(const char *nptr, char **endptr, int base) 47 { 48 const char *s; 49 __UINT acc, cutoff; 50 unsigned char c; 51 int any, cutlim, i, neg; 52 53 /* check base value */ 54 if (base && (base < 2 || base > 36)) { 55 #if !defined(_KERNEL) && !defined(_STANDALONE) 56 errno = EINVAL; 57 return (0); 58 #else 59 panic("%s: invalid base %d", __func__, base); 60 #endif 61 } 62 63 /* 64 * Skip white space and pick up leading +/- sign if any. 65 * If base is 0, allow 0x for hex and 0 for octal, else 66 * assume decimal; if base is already 16, allow 0x. 67 */ 68 s = nptr; 69 do { 70 c = *s++; 71 } while (isspace(c)); 72 if (c == '-') { 73 neg = 1; 74 c = *s++; 75 } else { 76 neg = 0; 77 if (c == '+') 78 c = *s++; 79 } 80 if ((base == 0 || base == 16) && 81 c == '0' && (*s == 'x' || *s == 'X')) { 82 c = s[1]; 83 s += 2; 84 base = 16; 85 } 86 if (base == 0) 87 base = (c == '0' ? 8 : 10); 88 89 /* 90 * See strtol for comments as to the logic used. 91 */ 92 cutoff = UINT_MAX / (__UINT)base; 93 cutlim = (int)(UINT_MAX % (__UINT)base); 94 for (acc = 0, any = 0;; c = *s++) { 95 if (isdigit(c)) 96 i = c - '0'; 97 else if (isalpha(c)) 98 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10); 99 else 100 break; 101 if (i >= base) 102 break; 103 if (any < 0) 104 continue; 105 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 106 acc = UINT_MAX; 107 #if !defined(_KERNEL) && !defined(_STANDALONE) 108 any = -1; 109 errno = ERANGE; 110 #else 111 any = 0; 112 break; 113 #endif 114 } else { 115 any = 1; 116 acc *= (__UINT)base; 117 acc += i; 118 } 119 } 120 if (neg && any > 0) 121 acc = -acc; 122 if (endptr != NULL) 123 /* LINTED interface specification */ 124 *endptr = __DECONST(void *, any ? s - 1 : nptr); 125 return (acc); 126 } 127