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 [rescinded 22 July 1999] 14 * 4.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 42 extern 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 */ 60 unsigned long 61 strtoul(const char *nptr, char **endptr, register int base) 62 { 63 register const char *s = nptr; 64 register unsigned long acc; 65 register int c; 66 register unsigned long cutoff; 67 register int neg = 0, any, cutlim; 68 69 /* 70 * See strtol for comments as to the logic used. 71 */ 72 do { 73 c = *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 = (unsigned long)ULONG_MAX / (unsigned long)base; 89 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; 90 for (acc = 0, any = 0;; c = *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 *endptr = (char *) (any ? s - 1 : nptr); 114 return (acc); 115 } 116