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