1: /*
   2: **  Sendmail
   3: **  Copyright (c) 1983  Eric P. Allman
   4: **  Berkeley, California
   5: **
   6: **  Copyright (c) 1983 Regents of the University of California.
   7: **  All rights reserved.  The Berkeley software License Agreement
   8: **  specifies the terms and conditions for redistribution.
   9: */
  10: 
  11: #if !defined(lint) && !defined(NOSCCS)
  12: static char SccsId[] = "@(#)macro.c	5.3 (Berkeley) 9/19/85";
  13: #endif
  14: 
  15: # include "sendmail.h"
  16: 
  17: /*
  18: **  EXPAND -- macro expand a string using $x escapes.
  19: **
  20: **	Parameters:
  21: **		s -- the string to expand.
  22: **		buf -- the place to put the expansion.
  23: **		buflim -- the buffer limit, i.e., the address
  24: **			of the last usable position in buf.
  25: **		e -- envelope in which to work.
  26: **
  27: **	Returns:
  28: **		none.
  29: **
  30: **	Side Effects:
  31: **		none.
  32: */
  33: 
  34: expand(s, buf, buflim, e)
  35:     register char *s;
  36:     register char *buf;
  37:     char *buflim;
  38:     register ENVELOPE *e;
  39: {
  40:     register char *xp;
  41:     register char *q;
  42:     bool skipping;      /* set if conditionally skipping output */
  43:     bool recurse = FALSE;   /* set if recursion required */
  44:     int i;
  45:     char xbuf[BUFSIZ];
  46:     extern char *macvalue();
  47: 
  48: # ifdef DEBUG
  49:     if (tTd(35, 24))
  50:     {
  51:         printf("expand(");
  52:         xputs(s);
  53:         printf(")\n");
  54:     }
  55: # endif DEBUG
  56: 
  57:     skipping = FALSE;
  58:     if (s == NULL)
  59:         s = "";
  60:     for (xp = xbuf; *s != '\0'; s++)
  61:     {
  62:         char c;
  63: 
  64:         /*
  65: 		**  Check for non-ordinary (special?) character.
  66: 		**	'q' will be the interpolated quantity.
  67: 		*/
  68: 
  69:         q = NULL;
  70:         c = *s;
  71:         switch (c)
  72:         {
  73:           case CONDIF:      /* see if var set */
  74:             c = *++s;
  75:             skipping = macvalue(c, e) == NULL;
  76:             continue;
  77: 
  78:           case CONDELSE:    /* change state of skipping */
  79:             skipping = !skipping;
  80:             continue;
  81: 
  82:           case CONDFI:      /* stop skipping */
  83:             skipping = FALSE;
  84:             continue;
  85: 
  86:           case '\001':      /* macro interpolation */
  87:             c = *++s;
  88:             q = macvalue(c & 0177, e);
  89:             if (q == NULL)
  90:                 continue;
  91:             break;
  92:         }
  93: 
  94:         /*
  95: 		**  Interpolate q or output one character
  96: 		*/
  97: 
  98:         if (skipping || xp >= &xbuf[sizeof xbuf])
  99:             continue;
 100:         if (q == NULL)
 101:             *xp++ = c;
 102:         else
 103:         {
 104:             /* copy to end of q or max space remaining in buf */
 105:             while ((c = *q++) != '\0' && xp < &xbuf[sizeof xbuf - 1])
 106:             {
 107:                 if (iscntrl(c) && !isspace(c))
 108:                     recurse = TRUE;
 109:                 *xp++ = c;
 110:             }
 111:         }
 112:     }
 113:     *xp = '\0';
 114: 
 115: # ifdef DEBUG
 116:     if (tTd(35, 24))
 117:     {
 118:         printf("expand ==> ");
 119:         xputs(xbuf);
 120:         printf("\n");
 121:     }
 122: # endif DEBUG
 123: 
 124:     /* recurse as appropriate */
 125:     if (recurse)
 126:     {
 127:         expand(xbuf, buf, buflim, e);
 128:         return;
 129:     }
 130: 
 131:     /* copy results out */
 132:     i = buflim - buf - 1;
 133:     if (i > xp - xbuf)
 134:         i = xp - xbuf;
 135:     bcopy(xbuf, buf, i);
 136:     buf[i] = '\0';
 137: }
 138: /*
 139: **  DEFINE -- define a macro.
 140: **
 141: **	this would be better done using a #define macro.
 142: **
 143: **	Parameters:
 144: **		n -- the macro name.
 145: **		v -- the macro value.
 146: **		e -- the envelope to store the definition in.
 147: **
 148: **	Returns:
 149: **		none.
 150: **
 151: **	Side Effects:
 152: **		e->e_macro[n] is defined.
 153: **
 154: **	Notes:
 155: **		There is one macro for each ASCII character,
 156: **		although they are not all used.  The currently
 157: **		defined macros are:
 158: **
 159: **		$a   date in ARPANET format (preferring the Date: line
 160: **		     of the message)
 161: **		$b   the current date (as opposed to the date as found
 162: **		     the message) in ARPANET format
 163: **		$c   hop count
 164: **		$d   (current) date in UNIX (ctime) format
 165: **		$e   the SMTP entry message+
 166: **		$f   raw from address
 167: **		$g   translated from address
 168: **		$h   to host
 169: **		$i   queue id
 170: **		$j   official SMTP hostname, used in messages+
 171: **		$l   UNIX-style from line+
 172: **		$n   name of sendmail ("MAILER-DAEMON" on local
 173: **		     net typically)+
 174: **		$o   delimiters ("operators") for address tokens+
 175: **		$p   my process id in decimal
 176: **		$q   the string that becomes an address -- this is
 177: **		     normally used to combine $g & $x.
 178: **		$r   protocol used to talk to sender
 179: **		$s   sender's host name
 180: **		$t   the current time in seconds since 1/1/1970
 181: **		$u   to user
 182: **		$v   version number of sendmail
 183: **		$w   our host name (if it can be determined)
 184: **		$x   signature (full name) of from person
 185: **		$y   the tty id of our terminal
 186: **		$z   home directory of to person
 187: **
 188: **		Macros marked with + must be defined in the
 189: **		configuration file and are used internally, but
 190: **		are not set.
 191: **
 192: **		There are also some macros that can be used
 193: **		arbitrarily to make the configuration file
 194: **		cleaner.  In general all upper-case letters
 195: **		are available.
 196: */
 197: 
 198: define(n, v, e)
 199:     char n;
 200:     char *v;
 201:     register ENVELOPE *e;
 202: {
 203: # ifdef DEBUG
 204:     if (tTd(35, 9))
 205:     {
 206:         printf("define(%c as ", n);
 207:         xputs(v);
 208:         printf(")\n");
 209:     }
 210: # endif DEBUG
 211:     e->e_macro[n & 0177] = v;
 212: }
 213: /*
 214: **  MACVALUE -- return uninterpreted value of a macro.
 215: **
 216: **	Parameters:
 217: **		n -- the name of the macro.
 218: **
 219: **	Returns:
 220: **		The value of n.
 221: **
 222: **	Side Effects:
 223: **		none.
 224: */
 225: 
 226: char *
 227: macvalue(n, e)
 228:     char n;
 229:     register ENVELOPE *e;
 230: {
 231:     n &= 0177;
 232:     while (e != NULL)
 233:     {
 234:         register char *p = e->e_macro[n];
 235: 
 236:         if (p != NULL)
 237:             return (p);
 238:         e = e->e_parent;
 239:     }
 240:     return (NULL);
 241: }

Defined functions

Defined variables

SccsId defined in line 12; never used
Last modified: 1988-02-11
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