isheader.c revision 9e364aca663e830f5a1b48c9d16cdff4c766c85d
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#include "mail.h"
27/*
28 * isheader(lp, ctf) - check if lp is header line and return type
29 *	lp	->	pointer to line
30 *	ctfp	->	continuation flag (should be FALSE the first time
31 *			isheader() is called on a message.  isheader() sets
32 *			it for the remaining calls to that message)
33 * returns
34 *	FALSE	->	not header line
35 *	H_*     ->	type of header line found.
36 */
37int
38isheader(char *lp, int *ctfp)
39{
40	char	*p, *q;
41	int	i;
42
43	p = lp;
44	while ((*p) && (*p != '\n') && (isspace(*p))) {
45		p++;
46	}
47	if ((*p == '\0') || (*p == '\n')) {
48		/* blank line */
49		return (FALSE);
50	}
51
52	if ((*ctfp) && ((*lp == ' ') || (*lp == '\t'))) {
53		return (H_CONT);
54	}
55
56	*ctfp = FALSE;
57	for (i = 1; i < H_CONT; i++) {
58		if (!isit(lp, i)) {
59			continue;
60		}
61		if ((i == H_FROM) || (i == H_FROM1)) {
62			/*
63			 * Should NEVER get 'From ' or '>From ' line on stdin
64			 * if invoked as mail (rather than rmail) since
65			 * 'From ' and/or '>From ' lines are generated by
66			 * program itself. Therefore, if it DOES match and
67			 * ismail == TRUE, it must be part of the content.
68			 */
69			if (sending && ismail && !deliverflag) {
70				return (FALSE);
71			}
72		}
73		*ctfp = TRUE;
74		return (i);
75	}
76	/*
77	 * Check if name: value pair
78	 */
79	if ((p = strpbrk(lp, ":")) != NULL) {
80		for (q = lp; q < p; q++)  {
81			if ((*q == ' ') || (!isprint(*q)))  {
82				return (FALSE);
83			}
84		}
85		*ctfp = TRUE;
86		return (H_NAMEVALUE);
87	}
88	return (FALSE);
89}
90