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) 1984 AT&T */ 23 /* All Rights Reserved */ 24 25 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 2.1 */ 26 27 /*LINTLIBRARY*/ 28 #include <ctype.h> 29 #define DIGIT(x) (isdigit(x) ? (x) - '0' : \ 30 islower(x) ? (x) + 10 - 'a' : (x) + 10 - 'A') 31 #define MBASE ('z' - 'a' + 1 + 10) 32 33 long 34 strtol(str, ptr, base) 35 register char *str; 36 char **ptr; 37 register int base; 38 { 39 register long val; 40 register int c; 41 int xx, neg = 0; 42 43 if (ptr != (char **)0) 44 *ptr = str; /* in case no number is formed */ 45 if (base < 0 || base > MBASE) 46 return (0); /* base is invalid -- should be a fatal error */ 47 if (!isalnum(c = *str)) { 48 while (isspace(c)) 49 c = *++str; 50 switch (c) { 51 case '-': 52 neg++; 53 case '+': /* fall-through */ 54 c = *++str; 55 } 56 } 57 if (base == 0) 58 if (c != '0') 59 base = 10; 60 else if (str[1] == 'x' || str[1] == 'X') 61 base = 16; 62 else 63 base = 8; 64 /* 65 * for any base > 10, the digits incrementally following 66 * 9 are assumed to be "abc...z" or "ABC...Z" 67 */ 68 if (!isalnum(c) || (xx = DIGIT(c)) >= base) 69 return (0); /* no number formed */ 70 if (base == 16 && c == '0' && isxdigit(str[2]) && 71 (str[1] == 'x' || str[1] == 'X')) 72 c = *(str += 2); /* skip over leading "0x" or "0X" */ 73 for (val = -DIGIT(c); isalnum(c = *++str) && (xx = DIGIT(c)) < base; ) 74 /* accumulate neg avoids surprises near MAXLONG */ 75 val = base * val - xx; 76 if (ptr != (char **)0) 77 *ptr = str; 78 return (neg ? val : -val); 79 } 80