1 /* $NetBSD: strtoul.c,v 1.1 2005/12/20 19:28:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if !defined(_KERNEL) && !defined(_STANDALONE) 33 #include <sys/cdefs.h> 34 #if defined(LIBC_SCCS) && !defined(lint) 35 #if 0 36 static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 37 #else 38 __RCSID("$NetBSD: strtoul.c,v 1.1 2005/12/20 19:28:52 christos Exp $"); 39 #endif 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include <assert.h> 43 #include <ctype.h> 44 #include <errno.h> 45 #include <limits.h> 46 #include <stdlib.h> 47 #else 48 #include <sys/param.h> 49 #include <lib/libkern/libkern.h> 50 #define isspace(x) ((x) == ' ' || (x) == '\t' || (x) == '\n' || (x) == '\r') 51 #define isdigit(x) ((x) >= '0' && (x) <= '9') 52 #define isalpha(x) (((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z')) 53 #define toupper(x) ((x) & ~0x20) 54 #endif 55 56 /* 57 * Convert a string to an unsigned long integer. 58 * 59 * Ignores `locale' stuff. Assumes that the upper and lower case 60 * alphabets and digits are each contiguous. 61 */ 62 unsigned long 63 strtoul(nptr, endptr, base) 64 const char *nptr; 65 char **endptr; 66 int base; 67 { 68 const char *s; 69 unsigned long acc, cutoff; 70 int c; 71 int neg, any, cutlim; 72 73 _DIAGASSERT(nptr != NULL); 74 /* endptr may be NULL */ 75 76 /* 77 * See strtol for comments as to the logic used. 78 */ 79 s = nptr; 80 do { 81 c = (unsigned char) *s++; 82 } while (isspace(c)); 83 if (c == '-') { 84 neg = 1; 85 c = *s++; 86 } else { 87 neg = 0; 88 if (c == '+') 89 c = *s++; 90 } 91 if ((base == 0 || base == 16) && 92 c == '0' && (*s == 'x' || *s == 'X')) { 93 c = s[1]; 94 s += 2; 95 base = 16; 96 } 97 if (base == 0) 98 base = c == '0' ? 8 : 10; 99 100 cutoff = ULONG_MAX / (unsigned long)base; 101 cutlim = (int)(ULONG_MAX % (unsigned long)base); 102 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 103 if (isdigit(c)) 104 c -= '0'; 105 else if (isalpha(c)) { 106 #if defined(_KERNEL) || defined(_STANDALONE) 107 c = toupper(c) - 'A' + 10; 108 #else 109 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 110 #endif 111 } else 112 break; 113 if (c >= base) 114 break; 115 if (any < 0) 116 continue; 117 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 118 #if defined(_KERNEL) || defined(_STANDALONE) 119 if (endptr) 120 *endptr = __UNCONST(nptr); 121 return ULONG_MAX; 122 #else 123 any = -1; 124 acc = ULONG_MAX; 125 errno = ERANGE; 126 #endif 127 } else { 128 any = 1; 129 acc *= (unsigned long)base; 130 acc += c; 131 } 132 } 133 if (neg && any > 0) 134 acc = -acc; 135 if (endptr != NULL) 136 *endptr = __UNCONST(any ? s - 1 : nptr); 137 return (acc); 138 } 139