1 /* $NetBSD: strtoul.c,v 1.1.1.1 2009/04/12 15:33:26 christos Exp $ */ 2 3 #if defined(LIBC_SCCS) && !defined(lint) 4 static const char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 5 static const char rcsid[] = "Id: strtoul.c,v 1.4 2008/02/18 03:49:08 marka Exp"; 6 #endif /* LIBC_SCCS and not lint */ 7 8 /* 9 * Copyright (c) 1990, 1993 10 * The Regents of the University of California. All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41 #include "port_before.h" 42 43 #include <sys/types.h> 44 #include <sys/param.h> 45 46 #include <ctype.h> 47 #include <errno.h> 48 #include <limits.h> 49 #include <stdlib.h> 50 51 #include "port_after.h" 52 53 #ifndef NEED_STRTOUL 54 int __strtoul_unneeded__; 55 #else 56 57 /*% 58 * Convert a string to an unsigned long integer. 59 * 60 * Ignores `locale' stuff. Assumes that the upper and lower case 61 * alphabets and digits are each contiguous. 62 */ 63 u_long 64 strtoul(const char *nptr, char **endptr, int base) { 65 const char *s = nptr; 66 u_long acc, cutoff; 67 int neg, c, any, cutlim; 68 69 neg = 0; 70 71 /* 72 * See strtol for comments as to the logic used. 73 */ 74 do { 75 c = *(const unsigned char *)s++; 76 } while (isspace(c)); 77 if (c == '-') { 78 neg = 1; 79 c = *s++; 80 } else if (c == '+') 81 c = *s++; 82 if ((base == 0 || base == 16) && 83 c == '0' && (*s == 'x' || *s == 'X')) { 84 c = s[1]; 85 s += 2; 86 base = 16; 87 } 88 if (base == 0) 89 base = c == '0' ? 8 : 10; 90 cutoff = (u_long)ULONG_MAX / (u_long)base; 91 cutlim = (u_long)ULONG_MAX % (u_long)base; 92 for (acc = 0, any = 0;; c = *(const unsigned char*)s++) { 93 if (isdigit(c)) 94 c -= '0'; 95 else if (isalpha(c)) 96 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 97 else 98 break; 99 if (c >= base) 100 break; 101 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 102 any = -1; 103 else { 104 any = 1; 105 acc *= base; 106 acc += c; 107 } 108 } 109 if (any < 0) { 110 acc = ULONG_MAX; 111 errno = ERANGE; 112 } else if (neg) 113 acc = -acc; 114 if (endptr != 0) 115 DE_CONST((any ? s - 1 : nptr), *endptr); 116 return (acc); 117 } 118 119 #endif /*NEED_STRTOUL*/ 120 121 /*! \file */ 122