/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


#include "mail.h"
/*
 * isheader(lp, ctf) - check if lp is header line and return type
 *      lp      ->      pointer to line
 *      ctfp    ->      continuation flag (should be FALSE the first time
 *                      isheader() is called on a message.  isheader() sets
 *                      it for the remaining calls to that message)
 * returns
 *      FALSE   ->      not header line
 *      H_*     ->      type of header line found.
 */
int
isheader(char *lp, int *ctfp)
{
        char    *p, *q;
        int     i;

        p = lp;
        while ((*p) && (*p != '\n') && (isspace(*p))) {
                p++;
        }
        if ((*p == '\0') || (*p == '\n')) {
                /* blank line */
                return (FALSE);
        }

        if ((*ctfp) && ((*lp == ' ') || (*lp == '\t'))) {
                return (H_CONT);
        }

        *ctfp = FALSE;
        for (i = 1; i < H_CONT; i++) {
                if (!isit(lp, i)) {
                        continue;
                }
                if ((i == H_FROM) || (i == H_FROM1)) {
                        /*
                         * Should NEVER get 'From ' or '>From ' line on stdin
                         * if invoked as mail (rather than rmail) since
                         * 'From ' and/or '>From ' lines are generated by
                         * program itself. Therefore, if it DOES match and
                         * ismail == TRUE, it must be part of the content.
                         */
                        if (sending && ismail && !deliverflag) {
                                return (FALSE);
                        }
                }
                *ctfp = TRUE;
                return (i);
        }
        /*
         * Check if name: value pair
         */
        if ((p = strpbrk(lp, ":")) != NULL) {
                for (q = lp; q < p; q++)  {
                        if ((*q == ' ') || (!isprint(*q)))  {
                                return (FALSE);
                        }
                }
                *ctfp = TRUE;
                return (H_NAMEVALUE);
        }
        return (FALSE);
}