usr/src/usr.sbin/sendmail/aux/matchhdr.c

/*
 * Copyright (c) 1983 Eric P. Allman
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)matchhdr.c  5.4 (Berkeley) 6/1/90";
#endif /* not lint */

# include <stdio.h>
# include <ctype.h>
# include <useful.h>

SCCSID(@(#)matchhdr.c   5.4             6/1/90);

/*
**  MATCHHDR -- Match header line
**
**      Matches a header line in arpanet format (case and white
**      space is ignored).
**
**      This routine is used by arpa-mailer and sendmail.
**
**      Parameters:
**              line -- the line to match against.
**              pat -- the pattern to match against; must be in
**                      lower case.
**
**      Returns:
**              address of the 'value' of the pattern (the beginning
**                      of the non-white string following the delim).
**              NULL if none found.
**
**      Side Effects:
**              none
**
**      Called By:
**              maketemp
**              sendmail [arpa.c]
**
**      Deficiencies:
**              It doesn't handle folded lines.
*/

char *
matchhdr(line, pat)
        char *line;
        char *pat;
{
        register char *p;
        register char *q;

        for (q = pat, p = line; *q != '\0'; p++, q++)
                if (lowercase(*p) != *q)
                        return (NULL);
        while (isspace(*p))
                p++;
        if (*p != ':')
                return (NULL);
        while (isspace(*++p))
                continue;
        return (*p == '\0' ? NULL : p);
}
\f/*
**  LOWERCASE -- Convert a character to lower case
**
**      If the argument is an upper case letter, it is converted
**      to a lower case letter, otherwise it is passed through
**      unchanged.
**
**      Parameters:
**              c -- the character to check.
**
**      Returns:
**              c converted to lower case.
**
**      Side Effects:
**              none
**
**      Called By:
**              matchhdr
*/

lowercase(c)
        register char c;
{
        if (isupper(c))
                c -= 'A' - 'a';
        return (c);
}