1/* 2 * Copyright (c) 1990 Regents of the University of California. 3 * 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. [rescinded 22 July 1999] 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#ifdef HAVE_CONFIG_H 32#include "config.h" 33#endif 34#ifdef HAVE_LIMITS_H 35#include <limits.h> 36#endif 37#ifdef HAVE_SYS_PARAM_H 38#include <sys/param.h> 39#endif 40#include <errno.h> 41#ifdef NEED_DECLARATION_ERRNO 42extern int errno; 43#endif 44#if 0 45#include <stdlib.h> 46#endif 47#include "ansidecl.h" 48#include "safe-ctype.h" 49 50#ifndef ULONG_MAX 51#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */ 52#endif 53 54/* 55 * Convert a string to an unsigned long integer. 56 * 57 * Ignores `locale' stuff. Assumes that the upper and lower case 58 * alphabets and digits are each contiguous. 59 */ 60unsigned long 61strtoul(nptr, endptr, base) 62 const char *nptr; 63 char **endptr; 64 register int base; 65{ 66 register const char *s = nptr; 67 register unsigned long acc; 68 register int c; 69 register unsigned long cutoff; 70 register int neg = 0, any, cutlim; 71 72 /* 73 * See strtol for comments as to the logic used. 74 */ 75 do { 76 c = *s++; 77 } while (ISSPACE(c)); 78 if (c == '-') { 79 neg = 1; 80 c = *s++; 81 } else if (c == '+') 82 c = *s++; 83 if ((base == 0 || base == 16) && 84 c == '0' && (*s == 'x' || *s == 'X')) { 85 c = s[1]; 86 s += 2; 87 base = 16; 88 } 89 if (base == 0) 90 base = c == '0' ? 8 : 10; 91 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; 92 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; 93 for (acc = 0, any = 0;; c = *s++) { 94 if (ISDIGIT(c)) 95 c -= '0'; 96 else if (ISALPHA(c)) 97 c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10; 98 else 99 break; 100 if (c >= base) 101 break; 102 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 103 any = -1; 104 else { 105 any = 1; 106 acc *= base; 107 acc += c; 108 } 109 } 110 if (any < 0) { 111 acc = ULONG_MAX; 112 errno = ERANGE; 113 } else if (neg) 114 acc = -acc; 115 if (endptr != 0) 116 *endptr = (char *) (any ? s - 1 : nptr); 117 return (acc); 118} 119