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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id: strtoul.c,v 12.2 2006/05/28 14:04:59 bostic Exp $ 34 */ 35 36#include "db_config.h" 37 38#include "db_int.h" 39 40/* 41 * Convert a string to an unsigned long integer. 42 * 43 * Assumes that the upper and lower case 44 * alphabets and digits are each contiguous. 45 * 46 * PUBLIC: #ifndef HAVE_STRTOUL 47 * PUBLIC: unsigned long strtoul __P((const char *, char **, int)); 48 * PUBLIC: #endif 49 */ 50unsigned long 51strtoul(nptr, endptr, base) 52 const char * nptr; 53 char ** endptr; 54 int base; 55{ 56 const char *s; 57 unsigned long acc; 58 char c; 59 unsigned long cutoff; 60 int neg, any, cutlim; 61 62 /* 63 * See strtol for comments as to the logic used. 64 */ 65 s = nptr; 66 do { 67 c = *s++; 68 } while (isspace((unsigned char)c)); 69 if (c == '-') { 70 neg = 1; 71 c = *s++; 72 } else { 73 neg = 0; 74 if (c == '+') 75 c = *s++; 76 } 77 if ((base == 0 || base == 16) && 78 c == '0' && (*s == 'x' || *s == 'X')) { 79 c = s[1]; 80 s += 2; 81 base = 16; 82 } 83 if (base == 0) 84 base = c == '0' ? 8 : 10; 85 acc = any = 0; 86 if (base < 2 || base > 36) 87 goto noconv; 88 89 cutoff = ULONG_MAX / base; 90 cutlim = ULONG_MAX % base; 91 for ( ; ; c = *s++) { 92 if (c >= '0' && c <= '9') 93 c -= '0'; 94 else if (c >= 'A' && c <= 'Z') 95 c -= 'A' - 10; 96 else if (c >= 'a' && c <= 'z') 97 c -= '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 (!any) { 114noconv: 115 errno = EINVAL; 116 } else if (neg) 117 acc = -acc; 118 if (endptr != NULL) 119 *endptr = (char *)(any ? s - 1 : nptr); 120 return (acc); 121} 122