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/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp $ 31 */ 32 33 /* 34 * function template for strtoul, strtoull and strtoumax. 35 * 36 * parameters: 37 * _FUNCNAME : function name 38 * __UINT : return type 39 * __UINT_MAX : upper limit of the return type 40 */ 41 42 __UINT 43 _FUNCNAME(const char *nptr, char **endptr, int base) 44 { 45 const char *s; 46 __UINT acc, cutoff; 47 char c; 48 int i, neg, any, cutlim; 49 50 _DIAGASSERT(nptr != NULL); 51 /* endptr may be NULL */ 52 53 /* check base value */ 54 if (base && (base < 2 || base > 36)) { 55 errno = EINVAL; 56 return(0); 57 } 58 59 /* 60 * Skip white space and pick up leading +/- sign if any. 61 * If base is 0, allow 0x for hex and 0 for octal, else 62 * assume decimal; if base is already 16, allow 0x. 63 */ 64 s = nptr; 65 do { 66 c = *s++; 67 } while (isspace(c)); 68 if (c == '-') { 69 neg = 1; 70 c = *s++; 71 } else { 72 neg = 0; 73 if (c == '+') 74 c = *s++; 75 } 76 if ((base == 0 || base == 16) && 77 c == '0' && (*s == 'x' || *s == 'X')) { 78 c = s[1]; 79 s += 2; 80 base = 16; 81 } 82 if (base == 0) 83 base = c == '0' ? 8 : 10; 84 85 /* 86 * See strtol for comments as to the logic used. 87 */ 88 cutoff = __UINT_MAX / (__UINT)base; 89 cutlim = (int)(__UINT_MAX % (__UINT)base); 90 for (acc = 0, any = 0;; c = *s++) { 91 if (!isascii(c)) 92 break; 93 if (isdigit(c)) 94 i = c - '0'; 95 else if (isalpha(c)) 96 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10); 97 else 98 break; 99 if (i >= base) 100 break; 101 if (any < 0) 102 continue; 103 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 104 any = -1; 105 acc = __UINT_MAX; 106 errno = ERANGE; 107 } else { 108 any = 1; 109 acc *= (__UINT)base; 110 acc += i; 111 } 112 } 113 if (neg && any > 0) 114 acc = -acc; 115 if (endptr != NULL) 116 /* LINTED interface specification */ 117 *endptr = __DECONST(char *, (any ? s - 1 : nptr)); 118 return(acc); 119 } 120