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 /* 23 * Copyright 1997 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* LINTLIBRARY */ 31 32 33 #include <errno.h> 34 #include <fcntl.h> 35 #include <stdio.h> 36 #include "lp.h" 37 #include "msgs.h" 38 39 static fifobuffer_t **FifoBufferTable = NULL; 40 static int FifoBufferTableSize = 0; 41 42 /* 43 ** Local functions 44 */ 45 static int InitFifoBufferTable (void); 46 static int GrowFifoBufferTable (int); 47 static fifobuffer_t *NewFifoBuffer (int); 48 49 50 int 51 ResetFifoBuffer(int fd) 52 { 53 if ((!FifoBufferTableSize) && (InitFifoBufferTable () < 0)) 54 return -1; 55 56 if (fd >= FifoBufferTableSize) 57 return 0; 58 59 if (FifoBufferTable [fd]) { 60 FifoBufferTable [fd]->full = 0; 61 FifoBufferTable [fd]->psave = 62 FifoBufferTable [fd]->psave_end = 63 FifoBufferTable [fd]->save; 64 } 65 return 0; 66 } 67 68 69 fifobuffer_t * 70 GetFifoBuffer(int fd) 71 { 72 if (fd < 0) { 73 errno = EINVAL; 74 return NULL; 75 } 76 if ((fd >= FifoBufferTableSize) && (GrowFifoBufferTable (fd) < 0)) 77 return NULL; 78 79 if (!FifoBufferTable [fd]) { 80 if (!NewFifoBuffer (fd)) 81 return NULL; 82 83 FifoBufferTable [fd]->full = 0; 84 FifoBufferTable [fd]->psave = 85 FifoBufferTable [fd]->psave_end = 86 FifoBufferTable [fd]->save; 87 } 88 89 return FifoBufferTable [fd]; 90 } 91 92 93 static int 94 InitFifoBufferTable() 95 { 96 if (FifoBufferTableSize) 97 return 0; 98 99 FifoBufferTable = (fifobuffer_t **) 100 Calloc (100, sizeof (fifobuffer_t *)); 101 if (!FifoBufferTable) 102 return -1; /* ENOMEM is already set. */ 103 104 FifoBufferTableSize = 100; 105 106 return 0; 107 } 108 109 110 static int 111 GrowFifoBufferTable (int fd) 112 { 113 fifobuffer_t **newpp; 114 115 newpp = (fifobuffer_t **) 116 Realloc ((void*)FifoBufferTable, 117 (fd+10)*sizeof (fifobuffer_t *)); 118 if (!newpp) 119 return -1; /* ENOMEM is already set. */ 120 121 FifoBufferTableSize = fd+10; 122 123 return 0; 124 } 125 126 127 static fifobuffer_t * 128 NewFifoBuffer(int fd) 129 { 130 int i; 131 132 for (i=0; i < FifoBufferTableSize; i++) 133 { 134 if (FifoBufferTable [i] && 135 Fcntl (i, F_GETFL) < 0 && 136 errno == EBADF) 137 { 138 FifoBufferTable [fd] = FifoBufferTable [i]; 139 FifoBufferTable [i] = NULL; 140 return FifoBufferTable [fd]; 141 } 142 } 143 FifoBufferTable [fd] = (fifobuffer_t *) 144 Calloc (1, sizeof (fifobuffer_t)); 145 146 return FifoBufferTable [fd]; 147 } 148