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 /* 31 * convert long int to base 64 ascii 32 * char set is [./0-9A-Za-z] 33 * two's complement negatives are assumed, 34 * but no assumptions are made about sign propagation on right shift 35 * 36 */ 37 38 #include "lint.h" 39 #include "mtlib.h" 40 #include "libc.h" 41 #include <values.h> 42 #include <synch.h> 43 #include <thread.h> 44 #include <stdlib.h> 45 #include <sys/types.h> 46 #include "tsd.h" 47 48 #define BITSPERCHAR 6 /* to hold entire character set */ 49 #define BITSUSED (BITSPERBYTE * sizeof (int)) 50 #define NMAX ((BITSUSED + BITSPERCHAR - 1)/BITSPERCHAR) 51 #define SIGN (-(1 << (BITSUSED - BITSPERCHAR - 1))) 52 #define CHARMASK ((1 << BITSPERCHAR) - 1) 53 #define WORDMASK ((1 << ((NMAX - 1) * BITSPERCHAR)) - 1) 54 55 char * l64a(long value)56l64a(long value) 57 { 58 /* XPG4: only the lower 32 bits are used */ 59 int lg = (int)value; 60 char *buf = tsdalloc(_T_L64A, NMAX + 1, NULL); 61 char *s = buf; 62 63 if (buf == NULL) 64 return (NULL); 65 66 while (lg != 0) { 67 68 int c = (lg & CHARMASK) + ('0' - 2); 69 70 if (c > '9') 71 c += 'A' - '9' - 1; 72 if (c > 'Z') 73 c += 'a' - 'Z' - 1; 74 *s++ = (char)c; 75 /* fill high-order CHAR if negative */ 76 /* but suppress sign propagation */ 77 lg = ((lg < 0) ? (lg >> BITSPERCHAR) | SIGN : 78 lg >> BITSPERCHAR) & WORDMASK; 79 } 80 *s = '\0'; 81 return (buf); 82 } 83