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Annotation of 43BSDTahoe/usr.lib/sendmail/src/macro.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Eric P. Allman
        !             3:  * Copyright (c) 1988 Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms are permitted
        !             7:  * provided that the above copyright notice and this paragraph are
        !             8:  * duplicated in all such forms and that any documentation,
        !             9:  * advertising materials, and other materials related to such
        !            10:  * distribution and use acknowledge that the software was developed
        !            11:  * by the University of California, Berkeley.  The name of the
        !            12:  * University may not be used to endorse or promote products derived
        !            13:  * from this software without specific prior written permission.
        !            14:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            15:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            16:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17:  */
        !            18: 
        !            19: #ifndef lint
        !            20: static char sccsid[] = "@(#)macro.c    5.5 (Berkeley) 6/30/88";
        !            21: #endif /* not lint */
        !            22: 
        !            23: # include "sendmail.h"
        !            24: 
        !            25: /*
        !            26: **  EXPAND -- macro expand a string using $x escapes.
        !            27: **
        !            28: **     Parameters:
        !            29: **             s -- the string to expand.
        !            30: **             buf -- the place to put the expansion.
        !            31: **             buflim -- the buffer limit, i.e., the address
        !            32: **                     of the last usable position in buf.
        !            33: **             e -- envelope in which to work.
        !            34: **
        !            35: **     Returns:
        !            36: **             none.
        !            37: **
        !            38: **     Side Effects:
        !            39: **             none.
        !            40: */
        !            41: 
        !            42: expand(s, buf, buflim, e)
        !            43:        register char *s;
        !            44:        register char *buf;
        !            45:        char *buflim;
        !            46:        register ENVELOPE *e;
        !            47: {
        !            48:        register char *xp;
        !            49:        register char *q;
        !            50:        bool skipping;          /* set if conditionally skipping output */
        !            51:        bool recurse = FALSE;   /* set if recursion required */
        !            52:        int i;
        !            53:        char xbuf[BUFSIZ];
        !            54:        extern char *macvalue();
        !            55: 
        !            56: # ifdef DEBUG
        !            57:        if (tTd(35, 24))
        !            58:        {
        !            59:                printf("expand(");
        !            60:                xputs(s);
        !            61:                printf(")\n");
        !            62:        }
        !            63: # endif DEBUG
        !            64: 
        !            65:        skipping = FALSE;
        !            66:        if (s == NULL)
        !            67:                s = "";
        !            68:        for (xp = xbuf; *s != '\0'; s++)
        !            69:        {
        !            70:                char c;
        !            71: 
        !            72:                /*
        !            73:                **  Check for non-ordinary (special?) character.
        !            74:                **      'q' will be the interpolated quantity.
        !            75:                */
        !            76: 
        !            77:                q = NULL;
        !            78:                c = *s;
        !            79:                switch (c)
        !            80:                {
        !            81:                  case CONDIF:          /* see if var set */
        !            82:                        c = *++s;
        !            83:                        skipping = macvalue(c, e) == NULL;
        !            84:                        continue;
        !            85: 
        !            86:                  case CONDELSE:        /* change state of skipping */
        !            87:                        skipping = !skipping;
        !            88:                        continue;
        !            89: 
        !            90:                  case CONDFI:          /* stop skipping */
        !            91:                        skipping = FALSE;
        !            92:                        continue;
        !            93: 
        !            94:                  case '\001':          /* macro interpolation */
        !            95:                        c = *++s;
        !            96:                        q = macvalue(c & 0177, e);
        !            97:                        if (q == NULL)
        !            98:                                continue;
        !            99:                        break;
        !           100:                }
        !           101: 
        !           102:                /*
        !           103:                **  Interpolate q or output one character
        !           104:                */
        !           105: 
        !           106:                if (skipping || xp >= &xbuf[sizeof xbuf])
        !           107:                        continue;
        !           108:                if (q == NULL)
        !           109:                        *xp++ = c;
        !           110:                else
        !           111:                {
        !           112:                        /* copy to end of q or max space remaining in buf */
        !           113:                        while ((c = *q++) != '\0' && xp < &xbuf[sizeof xbuf - 1])
        !           114:                        {
        !           115:                                if (iscntrl(c) && !isspace(c))
        !           116:                                        recurse = TRUE;
        !           117:                                *xp++ = c;
        !           118:                        }
        !           119:                }
        !           120:        }
        !           121:        *xp = '\0';
        !           122: 
        !           123: # ifdef DEBUG
        !           124:        if (tTd(35, 24))
        !           125:        {
        !           126:                printf("expand ==> ");
        !           127:                xputs(xbuf);
        !           128:                printf("\n");
        !           129:        }
        !           130: # endif DEBUG
        !           131: 
        !           132:        /* recurse as appropriate */
        !           133:        if (recurse)
        !           134:        {
        !           135:                expand(xbuf, buf, buflim, e);
        !           136:                return;
        !           137:        }
        !           138: 
        !           139:        /* copy results out */
        !           140:        i = buflim - buf - 1;
        !           141:        if (i > xp - xbuf)
        !           142:                i = xp - xbuf;
        !           143:        bcopy(xbuf, buf, i);
        !           144:        buf[i] = '\0';
        !           145: }
        !           146: /*
        !           147: **  DEFINE -- define a macro.
        !           148: **
        !           149: **     this would be better done using a #define macro.
        !           150: **
        !           151: **     Parameters:
        !           152: **             n -- the macro name.
        !           153: **             v -- the macro value.
        !           154: **             e -- the envelope to store the definition in.
        !           155: **
        !           156: **     Returns:
        !           157: **             none.
        !           158: **
        !           159: **     Side Effects:
        !           160: **             e->e_macro[n] is defined.
        !           161: **
        !           162: **     Notes:
        !           163: **             There is one macro for each ASCII character,
        !           164: **             although they are not all used.  The currently
        !           165: **             defined macros are:
        !           166: **
        !           167: **             $a   date in ARPANET format (preferring the Date: line
        !           168: **                  of the message)
        !           169: **             $b   the current date (as opposed to the date as found
        !           170: **                  the message) in ARPANET format
        !           171: **             $c   hop count
        !           172: **             $d   (current) date in UNIX (ctime) format
        !           173: **             $e   the SMTP entry message+
        !           174: **             $f   raw from address
        !           175: **             $g   translated from address
        !           176: **             $h   to host
        !           177: **             $i   queue id
        !           178: **             $j   official SMTP hostname, used in messages+
        !           179: **             $l   UNIX-style from line+
        !           180: **             $n   name of sendmail ("MAILER-DAEMON" on local
        !           181: **                  net typically)+
        !           182: **             $o   delimiters ("operators") for address tokens+
        !           183: **             $p   my process id in decimal
        !           184: **             $q   the string that becomes an address -- this is
        !           185: **                  normally used to combine $g & $x.
        !           186: **             $r   protocol used to talk to sender
        !           187: **             $s   sender's host name
        !           188: **             $t   the current time in seconds since 1/1/1970
        !           189: **             $u   to user
        !           190: **             $v   version number of sendmail
        !           191: **             $w   our host name (if it can be determined)
        !           192: **             $x   signature (full name) of from person
        !           193: **             $y   the tty id of our terminal
        !           194: **             $z   home directory of to person
        !           195: **
        !           196: **             Macros marked with + must be defined in the
        !           197: **             configuration file and are used internally, but
        !           198: **             are not set.
        !           199: **
        !           200: **             There are also some macros that can be used
        !           201: **             arbitrarily to make the configuration file
        !           202: **             cleaner.  In general all upper-case letters
        !           203: **             are available.
        !           204: */
        !           205: 
        !           206: define(n, v, e)
        !           207:        char n;
        !           208:        char *v;
        !           209:        register ENVELOPE *e;
        !           210: {
        !           211: # ifdef DEBUG
        !           212:        if (tTd(35, 9))
        !           213:        {
        !           214:                printf("define(%c as ", n);
        !           215:                xputs(v);
        !           216:                printf(")\n");
        !           217:        }
        !           218: # endif DEBUG
        !           219:        e->e_macro[n & 0177] = v;
        !           220: }
        !           221: /*
        !           222: **  MACVALUE -- return uninterpreted value of a macro.
        !           223: **
        !           224: **     Parameters:
        !           225: **             n -- the name of the macro.
        !           226: **
        !           227: **     Returns:
        !           228: **             The value of n.
        !           229: **
        !           230: **     Side Effects:
        !           231: **             none.
        !           232: */
        !           233: 
        !           234: char *
        !           235: macvalue(n, e)
        !           236:        char n;
        !           237:        register ENVELOPE *e;
        !           238: {
        !           239:        n &= 0177;
        !           240:        while (e != NULL)
        !           241:        {
        !           242:                register char *p = e->e_macro[n];
        !           243: 
        !           244:                if (p != NULL)
        !           245:                        return (p);
        !           246:                e = e->e_parent;
        !           247:        }
        !           248:        return (NULL);
        !           249: }

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