323 lines
7.4 KiB
C
323 lines
7.4 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define BUFSIZ 1024
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#define MAXHOP 32 /* max number of tc= indirections */
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#include <ctype.h>
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#include <unistd.h>
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/*
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* grindcap - routines for dealing with the language definitions data base
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* (code stolen almost totally from termcap)
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*
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* BUG: Should use a "last" pointer in tbuf, so that searching
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* for capabilities alphabetically would not be a n**2/2
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* process when large numbers of capabilities are given.
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* Note: If we add a last pointer now we will screw up the
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* tc capability. We really should compile termcap.
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*
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* Essentially all the work here is scanning and decoding escapes
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* in string capabilities. We don't use stdio because the editor
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* doesn't, and because living w/o it is not hard.
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*/
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static char *tbuf;
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static char *filename;
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static int hopcount; /* detect infinite loops in termcap, init 0 */
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static int tnchktc(void);
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static int tnamatch(char *);
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static char *tskip(register char *);
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static char *tdecode(register char *, char **);
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/*
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* Get an entry for terminal name in buffer bp,
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* from the termcap file. Parse is very rudimentary;
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* we just notice escaped newlines.
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*/
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int
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tgetent(char *bp, char *name, char *file)
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{
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register char *cp;
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register int c;
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register int i = 0, cnt = 0;
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char ibuf[BUFSIZ];
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char *cp2;
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int tf;
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tbuf = bp;
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tf = 0;
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filename = file;
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tf = open(filename, 0);
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if (tf < 0)
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return (-1);
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for (;;) {
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cp = bp;
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for (;;) {
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if (i == cnt) {
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cnt = read(tf, ibuf, BUFSIZ);
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if (cnt <= 0) {
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close(tf);
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return (0);
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}
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i = 0;
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}
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c = ibuf[i++];
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if (c == '\n') {
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if (cp > bp && cp[-1] == '\\'){
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cp--;
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continue;
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}
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break;
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}
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if (cp >= bp+BUFSIZ) {
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write(STDERR_FILENO, "Vgrind entry too long\n", 23);
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break;
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} else
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*cp++ = c;
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}
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*cp = 0;
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/*
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* The real work for the match.
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*/
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if (tnamatch(name)) {
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close(tf);
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return(tnchktc());
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}
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}
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}
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/*
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* tnchktc: check the last entry, see if it's tc=xxx. If so,
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* recursively find xxx and append that entry (minus the names)
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* to take the place of the tc=xxx entry. This allows termcap
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* entries to say "like an HP2621 but doesn't turn on the labels".
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* Note that this works because of the left to right scan.
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*/
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static int
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tnchktc(void)
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{
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register char *p, *q;
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char tcname[16]; /* name of similar terminal */
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char tcbuf[BUFSIZ];
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char *holdtbuf = tbuf;
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int l;
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p = tbuf + strlen(tbuf) - 2; /* before the last colon */
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while (*--p != ':')
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if (p<tbuf) {
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write(STDERR_FILENO, "Bad vgrind entry\n", 18);
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return (0);
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}
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p++;
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/* p now points to beginning of last field */
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if (p[0] != 't' || p[1] != 'c')
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return(1);
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strcpy(tcname,p+3);
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q = tcname;
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while (q && *q != ':')
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q++;
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*q = 0;
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if (++hopcount > MAXHOP) {
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write(STDERR_FILENO, "Infinite tc= loop\n", 18);
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return (0);
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}
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if (tgetent(tcbuf, tcname, filename) != 1)
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return(0);
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for (q=tcbuf; *q != ':'; q++)
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;
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l = p - holdtbuf + strlen(q);
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if (l > BUFSIZ) {
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write(STDERR_FILENO, "Vgrind entry too long\n", 23);
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q[BUFSIZ - (p-tbuf)] = 0;
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}
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strcpy(p, q+1);
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tbuf = holdtbuf;
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return(1);
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}
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/*
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* Tnamatch deals with name matching. The first field of the termcap
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* entry is a sequence of names separated by |'s, so we compare
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* against each such name. The normal : terminator after the last
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* name (before the first field) stops us.
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*/
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static int
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tnamatch(char *np)
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{
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register char *Np, *Bp;
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Bp = tbuf;
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if (*Bp == '#')
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return(0);
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for (;;) {
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for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
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continue;
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if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
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return (1);
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while (*Bp && *Bp != ':' && *Bp != '|')
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Bp++;
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if (*Bp == 0 || *Bp == ':')
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return (0);
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Bp++;
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}
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}
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/*
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* Skip to the next field. Notice that this is very dumb, not
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* knowing about \: escapes or any such. If necessary, :'s can be put
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* into the termcap file in octal.
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*/
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static char *
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tskip(register char *bp)
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{
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while (*bp && *bp != ':')
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bp++;
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if (*bp == ':')
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bp++;
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return (bp);
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}
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/*
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* Return the (numeric) option id.
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* Numeric options look like
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* li#80
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* i.e. the option string is separated from the numeric value by
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* a # character. If the option is not found we return -1.
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* Note that we handle octal numbers beginning with 0.
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*/
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tgetnum(id)
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char *id;
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{
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register int i, base;
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register char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (*bp == 0)
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return (-1);
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if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
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continue;
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if (*bp == '@')
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return(-1);
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if (*bp != '#')
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continue;
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bp++;
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base = 10;
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if (*bp == '0')
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base = 8;
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i = 0;
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while (isdigit(*bp))
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i *= base, i += *bp++ - '0';
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return (i);
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}
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}
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/*
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* Handle a flag option.
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* Flag options are given "naked", i.e. followed by a : or the end
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* of the buffer. Return 1 if we find the option, or 0 if it is
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* not given.
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*/
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int
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tgetflag(char *id)
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{
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register char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (!*bp)
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return (0);
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if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
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if (!*bp || *bp == ':')
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return (1);
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else if (*bp == '@')
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return(0);
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}
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}
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}
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/*
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* Get a string valued option.
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* These are given as
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* cl=^Z
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* Much decoding is done on the strings, and the strings are
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* placed in area, which is a ref parameter which is updated.
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* No checking on area overflow.
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*/
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char *
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tgetstr(char *id, char **area)
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{
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register char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (!*bp)
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return (0);
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if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
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continue;
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if (*bp == '@')
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return(0);
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if (*bp != '=')
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continue;
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bp++;
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return (tdecode(bp, area));
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}
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}
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/*
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* Tdecode does the grung work to decode the
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* string capability escapes.
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*/
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static char *
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tdecode(register char *str, char **area)
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{
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register char *cp;
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register int c;
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int i;
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cp = *area;
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while (c = *str++) {
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if (c == ':' && *(cp-1) != '\\')
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break;
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*cp++ = c;
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}
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*cp++ = 0;
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str = *area;
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*area = cp;
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return (str);
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}
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