usr/src/cmd/lp/lib/msgs/mgetputm.c

   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
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.6   */
  32
  33 # include       <unistd.h>
  34 # include       <errno.h>
  35 # include       <stdlib.h>
  36
  37 #if     defined(__STDC__)
  38 # include       <stdarg.h>
  39 #else
  40 # include       <varargs.h>
  41 #endif
  42
  43 # include       "lp.h"
  44 # include       "msgs.h"
  45
  46
  47 /*
  48 **      Size and pointer for mgetm()
  49 */
  50 static int      MBGSize = 0;
  51 static char *   MBG = NULL;
  52
  53 /*
  54 **      Size and pointer for mputm()
  55 */
  56 static int      MBPSize = 0;
  57 static char *   MBP = NULL;
  58
  59 int             peek3_2();
  60
  61 #if     defined(__STDC__)
  62 int mgetm ( MESG * md, int type, ... )
  63 #else
  64 int mgetm (md, type, va_alist)
  65     MESG        *md;
  66     int         type;
  67     va_dcl
  68 #endif
  69 {
  70     va_list     vp;
  71     int         ret;
  72     int         needsize;
  73
  74 #if     defined(__STDC__)
  75     va_start(vp, type);
  76 #else
  77     va_start(vp);
  78 #endif
  79
  80     needsize = mpeek(md);
  81     if (needsize <=0 || needsize > MSGMAX)
  82         needsize = MSGMAX;
  83     if (needsize > MBGSize)
  84     {
  85         if (MBG)
  86             Free(MBG);
  87         if ((MBG = (char *)Malloc(needsize)) == NULL)
  88         {
  89             MBGSize = 0;
  90             MBG = NULL;
  91             errno = ENOMEM;
  92             return(-1);
  93         }
  94         MBGSize = needsize;
  95     }
  96     if (mread(md, MBG, MBGSize) < 0)
  97         return(-1);
  98
  99     ret = _getmessage(MBG, type, vp);
 100
 101     va_end(vp);
 102
 103     return(ret);
 104 }
 105
 106 #if     defined(__STDC__)
 107 int mputm ( MESG * md, int type, ... )
 108 #else
 109 int mputm (md, type, va_alist)
 110     MESG        *md;
 111     int         type;
 112     va_dcl
 113 #endif
 114 {
 115     va_list     vp;
 116     int         needsize;
 117
 118 #if     defined(__STDC__)
 119     va_start(vp, type);
 120 #else
 121     va_start(vp);
 122 #endif
 123     needsize = _putmessage(NULL, type, vp);
 124     va_end(vp);
 125     if (needsize <= 0)
 126         return(-1);
 127
 128     if (needsize > MBPSize)
 129     {
 130         if (MBP)
 131             Free(MBP);
 132         if ((MBP = (char *)Malloc(needsize)) == NULL)
 133         {
 134             MBPSize = 0;
 135             MBP = NULL;
 136             errno = ENOMEM;
 137             return(-1);
 138         }
 139         MBPSize = needsize;
 140     }
 141
 142 #if     defined(__STDC__)
 143     va_start(vp, type);
 144 #else
 145     va_start(vp);
 146 #endif
 147     needsize = _putmessage(MBP, type, vp);
 148     va_end(vp);
 149     if (needsize <= 0)
 150         return(-1);
 151
 152
 153     return(mwrite(md, MBP));
 154 }
 155
 156 #if     defined(__STDC__)
 157 void __mbfree ( void )
 158 #else
 159 void __mbfree ()
 160 #endif
 161 {
 162     MBGSize = MBPSize = 0;
 163     if (MBG)
 164         Free (MBG);
 165     if (MBP)
 166         Free (MBP);
 167     MBG = MBP = NULL;
 168 }
 169
 170 #if     defined(__STDC__)
 171 short mpeek ( MESG * md )
 172 #else
 173 short mpeek (md)
 174     MESG        *md;
 175 #endif
 176 {
 177     int size;
 178
 179     if (md->type == MD_USR_FIFO || md->type == MD_SYS_FIFO)
 180         return(peek3_2(md->readfd) - EXCESS_3_2_LEN);
 181
 182     if (ioctl(md->readfd, I_NREAD, &size))
 183         return((short)size);
 184
 185     return(-1);
 186 }