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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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 != ':') {