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33 * @(#)vgrindefs.c 8.1 (Berkeley) 6/6/93
35 * $DragonFly: src/usr.bin/vgrind/vgrindefs.c,v 1.3 2003/10/04 20:36:54 hmp Exp $
39 #define MAXHOP 32 /* max number of tc= indirections */
43 * grindcap - routines for dealing with the language definitions data base
44 * (code stolen almost totally from termcap)
46 * BUG: Should use a "last" pointer in tbuf, so that searching
47 * for capabilities alphabetically would not be a n**2/2
48 * process when large numbers of capabilities are given.
49 * Note: If we add a last pointer now we will screw up the
50 * tc capability. We really should compile termcap.
52 * Essentially all the work here is scanning and decoding escapes
53 * in string capabilities. We don't use stdio because the editor
54 * doesn't, and because living w/o it is not hard.
58 static char *filename;
59 static int hopcount; /* detect infinite loops in termcap, init 0 */
66 * Get an entry for terminal name in buffer bp,
67 * from the termcap file. Parse is very rudimentary;
68 * we just notice escaped newlines.
71 tgetent(char *bp, char *name, char *file)
75 register int i = 0, cnt = 0;
83 tf = open(filename, 0);
90 cnt = read(tf, ibuf, BUFSIZ);
99 if (cp > bp && cp[-1] == '\\'){
105 if (cp >= bp+BUFSIZ) {
106 write(2,"Vgrind entry too long\n", 23);
114 * The real work for the match.
116 if (tnamatch(name)) {
124 * tnchktc: check the last entry, see if it's tc=xxx. If so,
125 * recursively find xxx and append that entry (minus the names)
126 * to take the place of the tc=xxx entry. This allows termcap
127 * entries to say "like an HP2621 but doesn't turn on the labels".
128 * Note that this works because of the left to right scan.
133 register char *p, *q;
134 char tcname[16]; /* name of similar terminal */
136 char *holdtbuf = tbuf;
139 p = tbuf + strlen(tbuf) - 2; /* before the last colon */
142 write(2, "Bad vgrind entry\n", 18);
146 /* p now points to beginning of last field */
147 if (p[0] != 't' || p[1] != 'c')
151 while (q && *q != ':')
154 if (++hopcount > MAXHOP) {
155 write(2, "Infinite tc= loop\n", 18);
158 if (tgetent(tcbuf, tcname, filename) != 1)
160 for (q=tcbuf; *q != ':'; q++)
162 l = p - holdtbuf + strlen(q);
164 write(2, "Vgrind entry too long\n", 23);
165 q[BUFSIZ - (p-tbuf)] = 0;
173 * Tnamatch deals with name matching. The first field of the termcap
174 * entry is a sequence of names separated by |'s, so we compare
175 * against each such name. The normal : terminator after the last
176 * name (before the first field) stops us.
181 register char *Np, *Bp;
187 for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
189 if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
191 while (*Bp && *Bp != ':' && *Bp != '|')
193 if (*Bp == 0 || *Bp == ':')
200 * Skip to the next field. Notice that this is very dumb, not
201 * knowing about \: escapes or any such. If necessary, :'s can be put
202 * into the termcap file in octal.
205 tskip(register char *bp)
208 while (*bp && *bp != ':')
216 * Return the (numeric) option id.
217 * Numeric options look like
219 * i.e. the option string is separated from the numeric value by
220 * a # character. If the option is not found we return -1.
221 * Note that we handle octal numbers beginning with 0.
226 register int i, base;
227 register char *bp = tbuf;
233 if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
245 i *= base, i += *bp++ - '0';
251 * Handle a flag option.
252 * Flag options are given "naked", i.e. followed by a : or the end
253 * of the buffer. Return 1 if we find the option, or 0 if it is
259 register char *bp = tbuf;
265 if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
266 if (!*bp || *bp == ':')
275 * Get a string valued option.
278 * Much decoding is done on the strings, and the strings are
279 * placed in area, which is a ref parameter which is updated.
280 * No checking on area overflow.
283 tgetstr(char *id, char **area)
285 register char *bp = tbuf;
291 if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
298 return (tdecode(bp, area));
303 * Tdecode does the grung work to decode the
304 * string capability escapes.
307 tdecode(register char *str, char **area)
315 if (c == ':' && *(cp-1) != '\\')