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1.1 root 1: # include "sendmail.h"
2:
3: SCCSID(@(#)macro.c 4.1 7/25/83);
4:
5: /*
6: ** EXPAND -- macro expand a string using $x escapes.
7: **
8: ** Parameters:
9: ** s -- the string to expand.
10: ** buf -- the place to put the expansion.
11: ** buflim -- the buffer limit, i.e., the address
12: ** of the last usable position in buf.
13: ** e -- envelope in which to work.
14: **
15: ** Returns:
16: ** none.
17: **
18: ** Side Effects:
19: ** none.
20: **
21: ** Bugs:
22: ** The handling of $$ (to get one dollar) is rather bizarre,
23: ** especially if there should be another macro
24: ** expansion in the same string.
25: */
26:
27: expand(s, buf, buflim, e)
28: register char *s;
29: register char *buf;
30: char *buflim;
31: register ENVELOPE *e;
32: {
33: register char *q;
34: bool skipping; /* set if conditionally skipping output */
35: bool gotone = FALSE; /* set if any expansion done */
36: char xbuf[BUFSIZ];
37: register char *xp = xbuf;
38: extern char *macvalue();
39:
40: # ifdef DEBUG
41: if (tTd(35, 4))
42: {
43: printf("expand(");
44: xputs(s);
45: printf(")\n");
46: }
47: # endif DEBUG
48:
49: skipping = FALSE;
50: if (s == NULL)
51: s = "";
52: for (; *s != '\0'; s++)
53: {
54: char c;
55:
56: /*
57: ** Check for non-ordinary (special?) character.
58: ** 'q' will be the interpolated quantity.
59: */
60:
61: q = NULL;
62: c = *s;
63: switch (c)
64: {
65: case CONDIF: /* see if var set */
66: c = *++s;
67: skipping = macvalue(c, e) == NULL;
68: continue;
69:
70: case CONDELSE: /* change state of skipping */
71: skipping = !skipping;
72: continue;
73:
74: case CONDFI: /* stop skipping */
75: skipping = FALSE;
76: continue;
77:
78: case '$': /* macro interpolation */
79: c = *++s;
80: if (c == '$')
81: break;
82: q = macvalue(c & 0177, e);
83: if (q == NULL)
84: continue;
85: gotone = TRUE;
86: break;
87: }
88:
89: /*
90: ** Interpolate q or output one character
91: */
92:
93: if (skipping)
94: continue;
95: while (xp < &xbuf[sizeof xbuf])
96: {
97: if (q == NULL)
98: {
99: *xp++ = c;
100: break;
101: }
102: if (*q == '\0')
103: break;
104: *xp++ = *q++;
105: }
106: }
107: *xp = '\0';
108:
109: # ifdef DEBUG
110: if (tTd(35, 4))
111: {
112: printf("expand ==> ");
113: xputs(xbuf);
114: printf("\n");
115: }
116: # endif DEBUG
117:
118: /* recurse as appropriate */
119: if (gotone)
120: {
121: expand(xbuf, buf, buflim, e);
122: return;
123: }
124:
125: /* copy results out */
126: for (q = buf, xp = xbuf; xp != '\0' && q < buflim-1; )
127: *q++ = *xp++;
128: *q = '\0';
129: }
130: /*
131: ** DEFINE -- define a macro.
132: **
133: ** this would be better done using a #define macro.
134: **
135: ** Parameters:
136: ** n -- the macro name.
137: ** v -- the macro value.
138: ** e -- the envelope to store the definition in.
139: **
140: ** Returns:
141: ** none.
142: **
143: ** Side Effects:
144: ** e->e_macro[n] is defined.
145: **
146: ** Notes:
147: ** There is one macro for each ASCII character,
148: ** although they are not all used. The currently
149: ** defined macros are:
150: **
151: ** $a date in ARPANET format (preferring the Date: line
152: ** of the message)
153: ** $b the current date (as opposed to the date as found
154: ** the message) in ARPANET format
155: ** $c hop count
156: ** $d (current) date in UNIX (ctime) format
157: ** $e the SMTP entry message+
158: ** $f raw from address
159: ** $g translated from address
160: ** $h to host
161: ** $i queue id
162: ** $j official SMTP hostname, used in messages+
163: ** $l UNIX-style from line+
164: ** $n name of sendmail ("MAILER-DAEMON" on local
165: ** net typically)+
166: ** $o delimiters ("operators") for address tokens+
167: ** $p my process id in decimal
168: ** $q the string that becomes an address -- this is
169: ** normally used to combine $g & $x.
170: ** $r protocol used to talk to sender
171: ** $s sender's host name
172: ** $t the current time in seconds since 1/1/1970
173: ** $u to user
174: ** $v version number of sendmail
175: ** $w our host name (if it can be determined)
176: ** $x signature (full name) of from person
177: ** $y the tty id of our terminal
178: ** $z home directory of to person
179: **
180: ** Macros marked with + must be defined in the
181: ** configuration file and are used internally, but
182: ** are not set.
183: **
184: ** There are also some macros that can be used
185: ** arbitrarily to make the configuration file
186: ** cleaner. In general all upper-case letters
187: ** are available.
188: */
189:
190: define(n, v, e)
191: char n;
192: char *v;
193: register ENVELOPE *e;
194: {
195: # ifdef DEBUG
196: if (tTd(35, 3))
197: {
198: printf("define(%c as ", n);
199: xputs(v);
200: printf(")\n");
201: }
202: # endif DEBUG
203: e->e_macro[n & 0177] = v;
204: }
205: /*
206: ** MACVALUE -- return uninterpreted value of a macro.
207: **
208: ** Parameters:
209: ** n -- the name of the macro.
210: **
211: ** Returns:
212: ** The value of n.
213: **
214: ** Side Effects:
215: ** none.
216: */
217:
218: char *
219: macvalue(n, e)
220: char n;
221: register ENVELOPE *e;
222: {
223: n &= 0177;
224: while (e != NULL)
225: {
226: register char *p = e->e_macro[n];
227:
228: if (p != NULL)
229: return (p);
230: e = e->e_parent;
231: }
232: return (NULL);
233: }
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