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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * convert long int to base 64 ascii 34 * char set is [./0-9A-Za-z] 35 * two's complement negatives are assumed, 36 * but no assumptions are made about sign propagation on right shift 37 * 38 */ 39 40 #include "lint.h" 41 #include "mtlib.h" 42 #include "libc.h" 43 #include <values.h> 44 #include <synch.h> 45 #include <thread.h> 46 #include <stdlib.h> 47 #include <sys/types.h> 48 #include "tsd.h" 49 50 #define BITSPERCHAR 6 /* to hold entire character set */ 51 #define BITSUSED (BITSPERBYTE * sizeof (int)) 52 #define NMAX ((BITSUSED + BITSPERCHAR - 1)/BITSPERCHAR) 53 #define SIGN (-(1 << (BITSUSED - BITSPERCHAR - 1))) 54 #define CHARMASK ((1 << BITSPERCHAR) - 1) 55 #define WORDMASK ((1 << ((NMAX - 1) * BITSPERCHAR)) - 1) 56 57 char * 58 l64a(long value) 59 { 60 /* XPG4: only the lower 32 bits are used */ 61 int lg = (int)value; 62 char *buf = tsdalloc(_T_L64A, NMAX + 1, NULL); 63 char *s = buf; 64 65 if (buf == NULL) 66 return (NULL); 67 68 while (lg != 0) { 69 70 int c = (lg & CHARMASK) + ('0' - 2); 71 72 if (c > '9') 73 c += 'A' - '9' - 1; 74 if (c > 'Z') 75 c += 'a' - 'Z' - 1; 76 *s++ = (char)c; 77 /* fill high-order CHAR if negative */ 78 /* but suppress sign propagation */ 79 lg = ((lg < 0) ? (lg >> BITSPERCHAR) | SIGN : 80 lg >> BITSPERCHAR) & WORDMASK; 81 } 82 *s = '\0'; 83 return (buf); 84 } 85