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 1.5 */ 26 27 /*LINTLIBRARY*/ 28 /* 29 * convert long int to base 64 ascii 30 * char set is [./0-9A-Za-z] 31 * two's complement negatives are assumed, 32 * but no assumptions are made about sign propagation on right shift 33 * 34 */ 35 36 #include <values.h> 37 #define BITSPERCHAR 6 /* to hold entire character set */ 38 #define BITSPERLONG (BITSPERBYTE * sizeof(long)) 39 #define NMAX ((BITSPERLONG + BITSPERCHAR - 1)/BITSPERCHAR) 40 #define SIGN (-(1L << (BITSPERLONG - BITSPERCHAR - 1))) 41 #define CHARMASK ((1 << BITSPERCHAR) - 1) 42 #define WORDMASK ((1L << ((NMAX - 1) * BITSPERCHAR)) - 1) 43 44 static char buf[NMAX + 1]; 45 46 char * l64a(lg)47l64a(lg) 48 register long lg; 49 { 50 register char *s = buf; 51 52 while (lg != 0) { 53 54 register int c = ((int)lg & CHARMASK) + ('0' - 2); 55 56 if (c > '9') 57 c += 'A' - '9' - 1; 58 if (c > 'Z') 59 c += 'a' - 'Z' - 1; 60 *s++ = c; 61 /* fill high-order CHAR if negative */ 62 /* but suppress sign propagation */ 63 lg = ((lg < 0) ? (lg >> BITSPERCHAR) | SIGN : 64 lg >> BITSPERCHAR) & WORDMASK; 65 } 66 *s = '\0'; 67 return (buf); 68 } 69