1: /*
   2:  * Copyright (c) 1988 Regents of the University of California.
   3:  * All rights reserved.
   4:  *
   5:  * Redistribution and use in source and binary forms are permitted
   6:  * provided that this notice is preserved and that due credit is given
   7:  * to the University of California at Berkeley. The name of the University
   8:  * may not be used to endorse or promote products derived from this
   9:  * software without specific prior written permission. This software
  10:  * is provided ``as is'' without express or implied warranty.
  11:  *
  12:  *  Sendmail
  13:  *  Copyright (c) 1983  Eric P. Allman
  14:  *  Berkeley, California
  15:  */
  16: 
  17: #if !defined(lint) && !defined(NOSCCS)
  18: static char sccsid[] = "@(#)macro.c	5.4 (Berkeley) 3/13/88";
  19: #endif /* not lint */
  20: 
  21: # include "sendmail.h"
  22: 
  23: /*
  24: **  EXPAND -- macro expand a string using $x escapes.
  25: **
  26: **	Parameters:
  27: **		s -- the string to expand.
  28: **		buf -- the place to put the expansion.
  29: **		buflim -- the buffer limit, i.e., the address
  30: **			of the last usable position in buf.
  31: **		e -- envelope in which to work.
  32: **
  33: **	Returns:
  34: **		none.
  35: **
  36: **	Side Effects:
  37: **		none.
  38: */
  39: 
  40: expand(s, buf, buflim, e)
  41:     register char *s;
  42:     register char *buf;
  43:     char *buflim;
  44:     register ENVELOPE *e;
  45: {
  46:     register char *xp;
  47:     register char *q;
  48:     bool skipping;      /* set if conditionally skipping output */
  49:     bool recurse = FALSE;   /* set if recursion required */
  50:     int i;
  51:     char xbuf[MAXLINE];
  52:     extern char *macvalue();
  53: 
  54: # ifdef DEBUG
  55:     if (tTd(35, 24))
  56:     {
  57:         printf("expand(");
  58:         xputs(s);
  59:         printf(")\n");
  60:     }
  61: # endif DEBUG
  62: 
  63:     skipping = FALSE;
  64:     if (s == NULL)
  65:         s = "";
  66:     for (xp = xbuf; *s != '\0'; s++)
  67:     {
  68:         char c;
  69: 
  70:         /*
  71: 		**  Check for non-ordinary (special?) character.
  72: 		**	'q' will be the interpolated quantity.
  73: 		*/
  74: 
  75:         q = NULL;
  76:         c = *s;
  77:         switch (c)
  78:         {
  79:           case CONDIF:      /* see if var set */
  80:             c = *++s;
  81:             skipping = macvalue(c, e) == NULL;
  82:             continue;
  83: 
  84:           case CONDELSE:    /* change state of skipping */
  85:             skipping = !skipping;
  86:             continue;
  87: 
  88:           case CONDFI:      /* stop skipping */
  89:             skipping = FALSE;
  90:             continue;
  91: 
  92:           case '\001':      /* macro interpolation */
  93:             c = *++s;
  94:             q = macvalue(c & 0177, e);
  95:             if (q == NULL)
  96:                 continue;
  97:             break;
  98:         }
  99: 
 100:         /*
 101: 		**  Interpolate q or output one character
 102: 		*/
 103: 
 104:         if (skipping || xp >= &xbuf[sizeof xbuf])
 105:             continue;
 106:         if (q == NULL)
 107:             *xp++ = c;
 108:         else
 109:         {
 110:             /* copy to end of q or max space remaining in buf */
 111:             while ((c = *q++) != '\0' && xp < &xbuf[sizeof xbuf - 1])
 112:             {
 113:                 if (iscntrl(c) && !isspace(c))
 114:                     recurse = TRUE;
 115:                 *xp++ = c;
 116:             }
 117:         }
 118:     }
 119:     *xp = '\0';
 120: 
 121: # ifdef DEBUG
 122:     if (tTd(35, 24))
 123:     {
 124:         printf("expand ==> ");
 125:         xputs(xbuf);
 126:         printf("\n");
 127:     }
 128: # endif DEBUG
 129: 
 130:     /* recurse as appropriate */
 131:     if (recurse)
 132:     {
 133:         expand(xbuf, buf, buflim, e);
 134:         return;
 135:     }
 136: 
 137:     /* copy results out */
 138:     i = buflim - buf - 1;
 139:     if (i > xp - xbuf)
 140:         i = xp - xbuf;
 141:     bcopy(xbuf, buf, i);
 142:     buf[i] = '\0';
 143: }
 144: /*
 145: **  DEFINE -- define a macro.
 146: **
 147: **	this would be better done using a #define macro.
 148: **
 149: **	Parameters:
 150: **		n -- the macro name.
 151: **		v -- the macro value.
 152: **		e -- the envelope to store the definition in.
 153: **
 154: **	Returns:
 155: **		none.
 156: **
 157: **	Side Effects:
 158: **		e->e_macro[n] is defined.
 159: **
 160: **	Notes:
 161: **		There is one macro for each ASCII character,
 162: **		although they are not all used.  The currently
 163: **		defined macros are:
 164: **
 165: **		$a   date in ARPANET format (preferring the Date: line
 166: **		     of the message)
 167: **		$b   the current date (as opposed to the date as found
 168: **		     the message) in ARPANET format
 169: **		$c   hop count
 170: **		$d   (current) date in UNIX (ctime) format
 171: **		$e   the SMTP entry message+
 172: **		$f   raw from address
 173: **		$g   translated from address
 174: **		$h   to host
 175: **		$i   queue id
 176: **		$j   official SMTP hostname, used in messages+
 177: **		$l   UNIX-style from line+
 178: **		$n   name of sendmail ("MAILER-DAEMON" on local
 179: **		     net typically)+
 180: **		$o   delimiters ("operators") for address tokens+
 181: **		$p   my process id in decimal
 182: **		$q   the string that becomes an address -- this is
 183: **		     normally used to combine $g & $x.
 184: **		$r   protocol used to talk to sender
 185: **		$s   sender's host name
 186: **		$t   the current time in seconds since 1/1/1970
 187: **		$u   to user
 188: **		$v   version number of sendmail
 189: **		$w   our host name (if it can be determined)
 190: **		$x   signature (full name) of from person
 191: **		$y   the tty id of our terminal
 192: **		$z   home directory of to person
 193: **
 194: **		Macros marked with + must be defined in the
 195: **		configuration file and are used internally, but
 196: **		are not set.
 197: **
 198: **		There are also some macros that can be used
 199: **		arbitrarily to make the configuration file
 200: **		cleaner.  In general all upper-case letters
 201: **		are available.
 202: */
 203: 
 204: define(n, v, e)
 205:     char n;
 206:     char *v;
 207:     register ENVELOPE *e;
 208: {
 209: # ifdef DEBUG
 210:     if (tTd(35, 9))
 211:     {
 212:         printf("define(%c as ", n);
 213:         xputs(v);
 214:         printf(")\n");
 215:     }
 216: # endif DEBUG
 217:     e->e_macro[n & 0177] = v;
 218: }
 219: /*
 220: **  MACVALUE -- return uninterpreted value of a macro.
 221: **
 222: **	Parameters:
 223: **		n -- the name of the macro.
 224: **
 225: **	Returns:
 226: **		The value of n.
 227: **
 228: **	Side Effects:
 229: **		none.
 230: */
 231: 
 232: char *
 233: macvalue(n, e)
 234:     char n;
 235:     register ENVELOPE *e;
 236: {
 237:     n &= 0177;
 238:     while (e != NULL)
 239:     {
 240:         register char *p = e->e_macro[n];
 241: 
 242:         if (p != NULL)
 243:             return (p);
 244:         e = e->e_parent;
 245:     }
 246:     return (NULL);
 247: }

Defined functions

Defined variables

sccsid defined in line 18; never used
Last modified: 1988-09-14
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