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- /*
- * 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
- static char sccsid[] = "@(#)macro.c 5.7 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- # include "sendmail.h"
-
- /*
- ** EXPAND -- macro expand a string using $x escapes.
- **
- ** Parameters:
- ** s -- the string to expand.
- ** buf -- the place to put the expansion.
- ** buflim -- the buffer limit, i.e., the address
- ** of the last usable position in buf.
- ** e -- envelope in which to work.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** none.
- */
-
- expand(s, buf, buflim, e)
- register char *s;
- register char *buf;
- char *buflim;
- register ENVELOPE *e;
- {
- register char *xp;
- register char *q;
- bool skipping; /* set if conditionally skipping output */
- bool recurse = FALSE; /* set if recursion required */
- int i;
- char xbuf[BUFSIZ];
- extern char *macvalue();
-
- if (tTd(35, 24))
- {
- printf("expand(");
- xputs(s);
- printf(")\n");
- }
-
- skipping = FALSE;
- if (s == NULL)
- s = "";
- for (xp = xbuf; *s != '\0'; s++)
- {
- char c;
-
- /*
- ** Check for non-ordinary (special?) character.
- ** 'q' will be the interpolated quantity.
- */
-
- q = NULL;
- c = *s;
- switch (c)
- {
- case CONDIF: /* see if var set */
- c = *++s;
- skipping = macvalue(c, e) == NULL;
- continue;
-
- case CONDELSE: /* change state of skipping */
- skipping = !skipping;
- continue;
-
- case CONDFI: /* stop skipping */
- skipping = FALSE;
- continue;
-
- case '\001': /* macro interpolation */
- c = *++s;
- q = macvalue(c & 0177, e);
- if (q == NULL)
- continue;
- break;
- }
-
- /*
- ** Interpolate q or output one character
- */
-
- if (skipping || xp >= &xbuf[sizeof xbuf])
- continue;
- if (q == NULL)
- *xp++ = c;
- else
- {
- /* copy to end of q or max space remaining in buf */
- while ((c = *q++) != '\0' && xp < &xbuf[sizeof xbuf - 1])
- {
- if (iscntrl(c) && !isspace(c))
- recurse = TRUE;
- *xp++ = c;
- }
- }
- }
- *xp = '\0';
-
- if (tTd(35, 24))
- {
- printf("expand ==> ");
- xputs(xbuf);
- printf("\n");
- }
-
- /* recurse as appropriate */
- if (recurse)
- {
- expand(xbuf, buf, buflim, e);
- return;
- }
-
- /* copy results out */
- i = buflim - buf - 1;
- if (i > xp - xbuf)
- i = xp - xbuf;
- bcopy(xbuf, buf, i);
- buf[i] = '\0';
- }
- /*
- ** DEFINE -- define a macro.
- **
- ** this would be better done using a #define macro.
- **
- ** Parameters:
- ** n -- the macro name.
- ** v -- the macro value.
- ** e -- the envelope to store the definition in.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** e->e_macro[n] is defined.
- **
- ** Notes:
- ** There is one macro for each ASCII character,
- ** although they are not all used. The currently
- ** defined macros are:
- **
- ** $a date in ARPANET format (preferring the Date: line
- ** of the message)
- ** $b the current date (as opposed to the date as found
- ** the message) in ARPANET format
- ** $c hop count
- ** $d (current) date in UNIX (ctime) format
- ** $e the SMTP entry message+
- ** $f raw from address
- ** $g translated from address
- ** $h to host
- ** $i queue id
- ** $j official SMTP hostname, used in messages+
- ** $l UNIX-style from line+
- ** $n name of sendmail ("MAILER-DAEMON" on local
- ** net typically)+
- ** $o delimiters ("operators") for address tokens+
- ** $p my process id in decimal
- ** $q the string that becomes an address -- this is
- ** normally used to combine $g & $x.
- ** $r protocol used to talk to sender
- ** $s sender's host name
- ** $t the current time in seconds since 1/1/1970
- ** $u to user
- ** $v version number of sendmail
- ** $w our host name (if it can be determined)
- ** $x signature (full name) of from person
- ** $y the tty id of our terminal
- ** $z home directory of to person
- **
- ** Macros marked with + must be defined in the
- ** configuration file and are used internally, but
- ** are not set.
- **
- ** There are also some macros that can be used
- ** arbitrarily to make the configuration file
- ** cleaner. In general all upper-case letters
- ** are available.
- */
-
- define(n, v, e)
- char n;
- char *v;
- register ENVELOPE *e;
- {
- if (tTd(35, 9))
- {
- printf("define(%c as ", n);
- xputs(v);
- printf(")\n");
- }
- e->e_macro[n & 0177] = v;
- }
- /*
- ** MACVALUE -- return uninterpreted value of a macro.
- **
- ** Parameters:
- ** n -- the name of the macro.
- **
- ** Returns:
- ** The value of n.
- **
- ** Side Effects:
- ** none.
- */
-
- char *
- macvalue(n, e)
- char n;
- register ENVELOPE *e;
- {
- n &= 0177;
- while (e != NULL)
- {
- register char *p = e->e_macro[n];
-
- if (p != NULL)
- return (p);
- e = e->e_parent;
- }
- return (NULL);
- }
-