isheader.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
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/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23/*	  All Rights Reserved  	*/
24
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI" 	/* SVr4.0 1.	*/
27#include "mail.h"
28/*
29 * isheader(lp, ctf) - check if lp is header line and return type
30 *	lp	-> 	pointer to line
31 *	ctfp	->	continuation flag (should be FALSE the first time
32 *			isheader() is called on a message.  isheader() sets
33 *			it for the remaining calls to that message)
34 * returns
35 *	FALSE	->	not header line
36 *	H_*     ->	type of header line found.
37 */
38int
39isheader(lp, ctfp)
40char	*lp;
41int	*ctfp;
42{
43	register char	*p, *q;
44	register int	i;
45
46	p = lp;
47	while((*p) && (*p != '\n') && (isspace(*p))) {
48		p++;
49	}
50	if((*p == NULL) || (*p == '\n')) {
51		/* blank line */
52		return (FALSE);
53	}
54
55	if ((*ctfp) && ((*lp == ' ') || (*lp == '\t'))) {
56		return(H_CONT);
57	}
58
59	*ctfp = FALSE;
60	for (i = 1; i < H_CONT; i++) {
61		if (!isit(lp, i)) {
62			continue;
63		}
64		if ((i == H_FROM) || (i == H_FROM1)) {
65			/*
66			 * Should NEVER get 'From ' or '>From ' line on stdin
67			 * if invoked as mail (rather than rmail) since
68			 * 'From ' and/or '>From ' lines are generated by
69			 * program itself. Therefore, if it DOES match and
70			 * ismail == TRUE, it must be part of the content.
71			 */
72			if (sending && ismail && !deliverflag) {
73				return (FALSE);
74			}
75		}
76		*ctfp = TRUE;
77		return (i);
78	}
79	/*
80	 * Check if name: value pair
81 	 */
82	if ((p = strpbrk(lp, ":")) != NULL ) {
83		for(q = lp; q < p; q++)  {
84			if ((*q == ' ') || (!isprint(*q)))  {
85				return(FALSE);
86			}
87		}
88		*ctfp = TRUE;
89		return(H_NAMEVALUE);
90	}
91	return(FALSE);
92}
93