1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.8 */ 32 33 #if !defined(_BOOT) && !defined(_KMDB) 34 #include "synonyms.h" 35 #endif /* !_BOOT && !_KMDB */ 36 #include <errno.h> 37 #include <ctype.h> 38 #include <limits.h> 39 #include <stdlib.h> 40 #include <sys/types.h> 41 42 #define DIGIT(x) \ 43 (isdigit(x) ? (x) - '0' : islower(x) ? (x) + 10 - 'a' : (x) + 10 - 'A') 44 45 #define MBASE ('z' - 'a' + 1 + 10) 46 47 /* 48 * The following macro is a local version of isalnum() which limits 49 * alphabetic characters to the ranges a-z and A-Z; locale dependent 50 * characters will not return 1. The members of a-z and A-Z are 51 * assumed to be in ascending order and contiguous 52 */ 53 #define lisalnum(x) \ 54 (isdigit(x) || ((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z')) 55 56 unsigned long 57 strtoul(const char *str, char **nptr, int base) 58 { 59 unsigned long val; 60 int c; 61 int xx; 62 unsigned long multmax; 63 int neg = 0; 64 const char **ptr = (const char **)nptr; 65 const unsigned char *ustr = (const unsigned char *)str; 66 67 if (ptr != (const char **)0) 68 *ptr = (char *)ustr; /* in case no number is formed */ 69 if (base < 0 || base > MBASE || base == 1) { 70 errno = EINVAL; 71 return (0); /* base is invalid -- should be a fatal error */ 72 } 73 if (!isalnum(c = *ustr)) { 74 while (isspace(c)) 75 c = *++ustr; 76 switch (c) { 77 case '-': 78 neg++; 79 /* FALLTHROUGH */ 80 case '+': 81 c = *++ustr; 82 } 83 } 84 if (base == 0) 85 if (c != '0') 86 base = 10; 87 else if (ustr[1] == 'x' || ustr[1] == 'X') 88 base = 16; 89 else 90 base = 8; 91 /* 92 * for any base > 10, the digits incrementally following 93 * 9 are assumed to be "abc...z" or "ABC...Z" 94 */ 95 if (!lisalnum(c) || (xx = DIGIT(c)) >= base) 96 return (0); /* no number formed */ 97 if (base == 16 && c == '0' && (ustr[1] == 'x' || ustr[1] == 'X') && 98 isxdigit(ustr[2])) 99 c = *(ustr += 2); /* skip over leading "0x" or "0X" */ 100 101 multmax = ULONG_MAX / (unsigned long)base; 102 val = DIGIT(c); 103 for (c = *++ustr; lisalnum(c) && (xx = DIGIT(c)) < base; ) { 104 if (val > multmax) 105 goto overflow; 106 val *= base; 107 if (ULONG_MAX - val < xx) 108 goto overflow; 109 val += xx; 110 c = *++ustr; 111 } 112 if (ptr != (const char **)0) 113 *ptr = (char *)ustr; 114 return (neg ? -val : val); 115 116 overflow: 117 for (c = *++ustr; lisalnum(c) && (xx = DIGIT(c)) < base; (c = *++ustr)) 118 ; 119 if (ptr != (const char **)0) 120 *ptr = (char *)ustr; 121 errno = ERANGE; 122 return (ULONG_MAX); 123 } 124