1 /* $KAME: advcap.c,v 1.5 2001/02/01 09:12:08 jinmei Exp $ */
4 * Copyright (c) 1983 The Regents of the University of California.
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17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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31 * $FreeBSD: src/usr.sbin/rtadvd/advcap.c,v 1.1.2.2 2001/07/03 11:02:13 ume Exp $
32 * $DragonFly: src/usr.sbin/rtadvd/advcap.c,v 1.5 2005/02/17 14:00:10 joerg Exp $
36 * remcap - routines for dealing with the remote host data base
38 * derived from termcap
40 #include <sys/types.h>
50 #include "pathnames.h"
55 #define MAXHOP 32 /* max number of tc= indirections */
57 #define tgetent agetent
58 #define tnchktc anchktc
59 #define tnamatch anamatch
60 #define tgetnum agetnum
61 #define tgetflag agetflag
62 #define tgetstr agetstr
65 #define V_TERMCAP "REMOTE"
72 * termcap - routines for dealing with the terminal capability data base
74 * BUG: Should use a "last" pointer in tbuf, so that searching
75 * for capabilities alphabetically would not be a n**2/2
76 * process when large numbers of capabilities are given.
77 * Note: If we add a last pointer now we will screw up the
78 * tc capability. We really should compile termcap.
80 * Essentially all the work here is scanning and decoding escapes
81 * in string capabilities. We don't use stdio because the editor
82 * doesn't, and because living w/o it is not hard.
86 static int hopcount
; /* detect infinite loops in termcap, init 0 */
88 static char *remotefile
;
90 extern char *conffile
;
92 int tgetent(char *, char *);
93 int getent(char *, char *, char *);
96 static char *tskip(char *);
97 long long tgetnum(char *);
99 char *tgetstr(char *, char **);
100 static char *tdecode(char *, char **);
103 * Get an entry for terminal name in buffer bp,
104 * from the termcap file. Parse is very rudimentary;
105 * we just notice escaped newlines.
108 tgetent(char *bp
, char *name
)
112 remotefile
= cp
= conffile
? conffile
: _PATH_RTADVDCONF
;
113 return (getent(bp
, name
, cp
));
117 getent(char *bp
, char *name
, char *cp
)
127 * TERMCAP can have one of two things in it. It can be the
128 * name of a file to use instead of /etc/termcap. In this
129 * case it better start with a "/". Or it can be an entry to
130 * use so we don't have to read the file. In this case it
131 * has to already have the newlines crunched out.
134 tf
= open(RM
= cp
, O_RDONLY
);
138 "<%s> open: %s", __func__
, strerror(errno
));
145 cnt
= read(tf
, ibuf
, BUFSIZ
);
154 if (cp
> bp
&& cp
[-1] == '\\') {
160 if (cp
>= bp
+BUFSIZ
) {
161 write(2,"Remcap entry too long\n", 23);
169 * The real work for the match.
171 if (tnamatch(name
)) {
179 * tnchktc: check the last entry, see if it's tc=xxx. If so,
180 * recursively find xxx and append that entry (minus the names)
181 * to take the place of the tc=xxx entry. This allows termcap
182 * entries to say "like an HP2621 but doesn't turn on the labels".
183 * Note that this works because of the left to right scan.
189 char tcname
[16]; /* name of similar terminal */
191 char *holdtbuf
= tbuf
;
194 p
= tbuf
+ strlen(tbuf
) - 2; /* before the last colon */
197 write(2, "Bad remcap entry\n", 18);
201 /* p now points to beginning of last field */
202 if (p
[0] != 't' || p
[1] != 'c')
206 while (*q
&& *q
!= ':')
209 if (++hopcount
> MAXHOP
) {
210 write(2, "Infinite tc= loop\n", 18);
213 if (getent(tcbuf
, tcname
, remotefile
) != 1) {
216 for (q
= tcbuf
; *q
++ != ':'; )
218 l
= p
- holdtbuf
+ strlen(q
);
220 write(2, "Remcap entry too long\n", 23);
221 q
[BUFSIZ
- (p
-holdtbuf
)] = 0;
229 * Tnamatch deals with name matching. The first field of the termcap
230 * entry is a sequence of names separated by |'s, so we compare
231 * against each such name. The normal : terminator after the last
232 * name (before the first field) stops us.
243 for (Np
= np
; *Np
&& *Bp
== *Np
; Bp
++, Np
++)
245 if (*Np
== 0 && (*Bp
== '|' || *Bp
== ':' || *Bp
== 0))
247 while (*Bp
&& *Bp
!= ':' && *Bp
!= '|')
249 if (*Bp
== 0 || *Bp
== ':')
256 * Skip to the next field. Notice that this is very dumb, not
257 * knowing about \: escapes or any such. If necessary, :'s can be put
258 * into the termcap file in octal.
277 while (isdigit(*bp
++))
282 dquote
= (dquote
? 1 : 0);
297 * Return the (numeric) option id.
298 * Numeric options look like
300 * i.e. the option string is separated from the numeric value by
301 * a # character. If the option is not found we return -1.
302 * Note that we handle octal numbers beginning with 0.
315 if (strncmp(bp
, id
, strlen(id
)) != 0)
328 i
*= base
, i
+= *bp
++ - '0';
334 * Handle a flag option.
335 * Flag options are given "naked", i.e. followed by a : or the end
336 * of the buffer. Return 1 if we find the option, or 0 if it is
348 if (strncmp(bp
, id
, strlen(id
)) == 0) {
350 if (!*bp
|| *bp
== ':')
359 * Get a string valued option.
362 * Much decoding is done on the strings, and the strings are
363 * placed in area, which is a ref parameter which is updated.
364 * No checking on area overflow.
367 tgetstr(char *id
, char **area
)
375 if (strncmp(bp
, id
, strlen(id
)) != 0)
383 return (tdecode(bp
, area
));
388 * Tdecode does the grunt work to decode the
389 * string capability escapes.
392 tdecode(char *str
, char **area
)
407 while ((c
= *str
++) && c
!= term
) {
415 dp
= "E\033^^\\\\::n\nr\rt\tb\bf\f\"\"";
428 c
<<= 3, c
|= *str
++ - '0';
429 while (--i
&& isdigit(*str
));
435 if (c
== term
&& term
!= ':') {