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      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 2005 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"
     32 
     33 #include "uucp.h"
     34 
     35 #define MSYNC	'\020'
     36 /* maximum likely message - make sure you don't get run away input */
     37 #define MAXIMSG	256
     38 
     39 /*
     40  * read message routine used before a
     41  * protocol is agreed upon.
     42  *	msg	-> address of input buffer
     43  *	fn	-> input file descriptor
     44  * returns:
     45  *	EOF	-> no more messages
     46  *	0	-> message returned
     47  */
     48 int
     49 imsg(msg, fn)
     50 char *msg;
     51 int fn;
     52 {
     53 	char c;
     54 	int i;
     55 	short fndsync;
     56 	char *bmsg;
     57 
     58 	fndsync = 0;
     59 	bmsg = msg;
     60 	CDEBUG(7, "imsg %s>", "");
     61 	while ((i = (*Read)(fn, msg, sizeof(char))) == sizeof(char)) {
     62 		*msg &= 0177;
     63 		c = *msg;
     64 		CDEBUG(7, "%s", c < 040 ? "^" : "");
     65 		CDEBUG(7, "%c", c < 040 ? c | 0100 : c);
     66 		if (c == MSYNC) { /* look for sync character */
     67 			msg = bmsg;
     68 			fndsync = 1;
     69 			continue;
     70 		}
     71 		if (!fndsync)
     72 			continue;
     73 
     74 		if (c == '\0' || c == '\n') {
     75 			*msg = '\0';
     76 			return(0);
     77 		}
     78 		else
     79 			msg++;
     80 
     81 		if (msg - bmsg > MAXIMSG)	/* unlikely */
     82 			return(FAIL);
     83 	}
     84 	/* have not found sync or end of message */
     85 	if (i < 0) {
     86 		CDEBUG(7, "\nimsg read error: %s\n", strerror(errno));
     87 	}
     88 	*msg = '\0';
     89 	return(EOF);
     90 }
     91 
     92 /*
     93  * initial write message routine -
     94  * used before a protocol is agreed upon.
     95  *	type	-> message type
     96  *	msg	-> message body address
     97  *	fn	-> file descriptor
     98  * return:
     99  *	Must always return 0 - wmesg (WMESG) looks for zero
    100  */
    101 int
    102 omsg(type, msg, fn)
    103 char *msg;
    104 char type;
    105 int fn;
    106 {
    107 	char buf[BUFSIZ];
    108 
    109 	(void) sprintf(buf, "%c%c%s", MSYNC, type, msg);
    110 	DEBUG( 7, "omsg \"%s\"\n", &buf[1] );
    111 	(*Write)(fn, buf, strlen(buf) + 1);
    112 	return(0);
    113 }
    114 
    115 /*
    116  * null turnoff routine to be used for errors
    117  * during protocol selection.
    118  */
    119 int
    120 turnoff(void)
    121 {
    122 	return(0);
    123 }
    124