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 1994 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 # include <unistd.h>
31 # include <errno.h>
32 # include <stdlib.h>
33
34 #if defined(__STDC__)
35 # include <stdarg.h>
36 #else
37 # include <varargs.h>
38 #endif
39
40 # include "lp.h"
41 # include "msgs.h"
42
43
44 /*
45 ** Size and pointer for mgetm()
46 */
47 static int MBGSize = 0;
48 static char * MBG = NULL;
49
50 /*
51 ** Size and pointer for mputm()
52 */
53 static int MBPSize = 0;
54 static char * MBP = NULL;
55
56 int peek3_2();
57
58 #if defined(__STDC__)
mgetm(MESG * md,int type,...)59 int mgetm ( MESG * md, int type, ... )
60 #else
61 int mgetm (md, type, va_alist)
62 MESG *md;
63 int type;
64 va_dcl
65 #endif
66 {
67 va_list vp;
68 int ret;
69 int needsize;
70
71 #if defined(__STDC__)
72 va_start(vp, type);
73 #else
74 va_start(vp);
75 #endif
76
77 needsize = mpeek(md);
78 if (needsize <=0 || needsize > MSGMAX)
79 needsize = MSGMAX;
80 if (needsize > MBGSize)
81 {
82 if (MBG)
83 Free(MBG);
84 if ((MBG = (char *)Malloc(needsize)) == NULL)
85 {
86 MBGSize = 0;
87 MBG = NULL;
88 errno = ENOMEM;
89 return(-1);
90 }
91 MBGSize = needsize;
92 }
93 if (mread(md, MBG, MBGSize) < 0)
94 return(-1);
95
96 ret = _getmessage(MBG, type, vp);
97
98 va_end(vp);
99
100 return(ret);
101 }
102
103 #if defined(__STDC__)
mputm(MESG * md,int type,...)104 int mputm ( MESG * md, int type, ... )
105 #else
106 int mputm (md, type, va_alist)
107 MESG *md;
108 int type;
109 va_dcl
110 #endif
111 {
112 va_list vp;
113 int needsize;
114
115 #if defined(__STDC__)
116 va_start(vp, type);
117 #else
118 va_start(vp);
119 #endif
120 needsize = _putmessage(NULL, type, vp);
121 va_end(vp);
122 if (needsize <= 0)
123 return(-1);
124
125 if (needsize > MBPSize)
126 {
127 if (MBP)
128 Free(MBP);
129 if ((MBP = (char *)Malloc(needsize)) == NULL)
130 {
131 MBPSize = 0;
132 MBP = NULL;
133 errno = ENOMEM;
134 return(-1);
135 }
136 MBPSize = needsize;
137 }
138
139 #if defined(__STDC__)
140 va_start(vp, type);
141 #else
142 va_start(vp);
143 #endif
144 needsize = _putmessage(MBP, type, vp);
145 va_end(vp);
146 if (needsize <= 0)
147 return(-1);
148
149
150 return(mwrite(md, MBP));
151 }
152
153 #if defined(__STDC__)
__mbfree(void)154 void __mbfree ( void )
155 #else
156 void __mbfree ()
157 #endif
158 {
159 MBGSize = MBPSize = 0;
160 if (MBG)
161 Free (MBG);
162 if (MBP)
163 Free (MBP);
164 MBG = MBP = NULL;
165 }
166
167 #if defined(__STDC__)
mpeek(MESG * md)168 short mpeek ( MESG * md )
169 #else
170 short mpeek (md)
171 MESG *md;
172 #endif
173 {
174 int size;
175
176 if (md->type == MD_USR_FIFO || md->type == MD_SYS_FIFO)
177 return(peek3_2(md->readfd) - EXCESS_3_2_LEN);
178
179 if (ioctl(md->readfd, I_NREAD, &size))
180 return((short)size);
181
182 return(-1);
183 }
184