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Atari Mega Archive 1
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lgrind.zoo
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vgrindefs.c
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C/C++ Source or Header
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1992-09-28
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7KB
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319 lines
#ifndef lint
static char sccsid[] = "@(#)vgrindefs.c 4.3 (Berkeley) 12/11/84";
static char Version[] =
"$Id: vgrindefs.c,v 1.2 91/10/01 00:29:08 gvr Exp $";
#endif
/* Copyright (c) 1979 Regents of the University of California */
#define BUFFERSIZE 4096
#define MAXHOP 32 /* max number of %|tc=|% indirections */
#include <stdlib.h>
#include <ctype.h>
/*
* grindcap --- routines for dealing with the language definitions data base
* (code stolen almost totally from termcap)
*
* BUG: Should use a "last" pointer in @tbuf@, so that searching
* for capabilities alphabetically would not be a %$n^2/2$%
* process when large numbers of capabilities are given.
* Note: If we add a last pointer now we will screw up the
* %|tc|% capability. We really should compile termcap.
*
* Essentially all the work here is scanning and decoding escapes
* in string capabilities. We don't use stdio because the editor
* doesn't, and because living w/o it is not hard.
*/
static char *tbuf;
static char *filename;
static int hopcount = 0; /* detect infinite loops in termcap */
char *tskip();
char *tgetstr();
char *tdecode();
/*
* Get an entry for terminal name in buffer @bp@,
* from the termcap file. Parse is very rudimentary;
* we just notice escaped newlines.
*/
int
tgetent(bp, name, file)
char *bp, *name, *file;
{
register char *cp;
register int c;
register int i = 0, cnt = 0;
char ibuf[BUFFERSIZE];
char *cp2;
int tf;
tbuf = bp;
tf = 0;
filename = file;
tf = open(filename, 0);
if (tf < 0)
return -1;
for (;;) {
cp = bp;
for (;;) {
if (i == cnt) {
cnt = read(tf, ibuf, BUFFERSIZE);
if (cnt <= 0) {
close(tf);
return 0;
}
i = 0;
}
c = ibuf[i++];
if (c == '\n') {
if (cp > bp && cp[-1] == '\\'){
cp--;
continue;
}
break;
}
if (cp >= bp+BUFFERSIZE) {
write(2,"Vgrind entry too long\n", 23);
break;
} else
*cp++ = c;
}
*cp = '\0';
/*
* The real work for the match.
*/
if (tnamatch(name)) {
close(tf);
return tnchktc();
}
}
}
/*
* @tnchktc@: check the last entry, see if it's %|tc=xxx|%. If so,
* recursively find %|xxx|% and append that entry (minus the names)
* to take the place of the %|tc=xxx|% entry. This allows termcap
* entries to say "like an HP2621 but doesn't turn on the labels".
* Note that this works because of the left to right scan.
*/
static int
tnchktc()
{
register char *p, *q;
char tcname[16]; /* name of similar terminal */
char tcbuf[BUFFERSIZE];
char *holdtbuf = tbuf;
int l;
p = tbuf + strlen(tbuf) - 2; /* before the last colon */
while (*--p != ':')
if (p < tbuf) {
write(2, "Bad vgrind entry\n", 18);
return 0;
}
p++;
/* @p@ now points to beginning of last field */
if (p[0] != 't' || p[1] != 'c')
return 1;
strcpy(tcname,p+3);
q = tcname;
while (q && *q != ':')
q++;
*q = '\0';
if (++hopcount > MAXHOP) {
write(2, "Infinite tc= loop\n", 18);
return 0;
}
if (tgetent(tcbuf, tcname, filename) != 1)
return 0;
for (q = tcbuf; *q != ':'; q++)
;
l = p - holdtbuf + strlen(q);
if (l > BUFFERSIZE) {
write(2, "Vgrind entry too long\n", 23);
q[BUFFERSIZE - (p-tbuf)] = '\0';
}
strcpy(p, q+1);
tbuf = holdtbuf;
return 1;
}
/*
* @tnamatch@ deals with name matching. The first field of the termcap
* entry is a sequence of names separated by %|||%'s, so we compare
* against each such name. The normal %|:|% terminator after the last
* name (before the first field) stops us.
*/
static int
tnamatch(np)
char *np;
{
register char *Np, *Bp;
Bp = tbuf;
if (*Bp == '#')
return 0;
for (;;) {
for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
continue;
if (*Np == '\0' && (*Bp == '|' || *Bp == ':' || *Bp == '\0'))
return 1;
while (*Bp != '\0' && *Bp != ':' && *Bp != '|')
Bp++;
if (*Bp == '\0' || *Bp == ':')
return 0;
Bp++;
}
}
/*
* Skip to the next field. Notice that this is very dumb, not
* knowing about %|\:|% escapes or any such. If necessary, %|:|%'s can
* be put into the termcap file in octal.
*/
static char *
tskip(bp)
register char *bp;
{
while (*bp && *bp != ':')
bp++;
if (*bp == ':')
bp++;
return bp;
}
/*
* Return the (numeric) option id.
* Numeric options look like
* %|li#80|%
* i.e. the option string is separated from the numeric value by
* a %|#|% character. If the option is not found we return %$-1$%.
* Note that we handle octal numbers beginning with %$0$%.
*/
int
tgetnum(id)
char *id;
{
register int i, base;
register char *bp = tbuf;
for (;;) {
bp = tskip(bp);
if (*bp == '\0')
return -1;
if (*bp++ != id[0] || *bp == '\0' || *bp++ != id[1])
continue;
if (*bp == '@')
return -1;
if (*bp != '#')
continue;
bp++;
base = 10;
if (*bp == '0')
base = 8;
i = 0;
while (isdigit(*bp))
i *= base, i += *bp++ - '0';
return i;
}
}
/*
* Handle a flag option.
* Flag options are given "naked", i.e. followed by a %|:|% or the end
* of the buffer. Return 1 if we find the option, or 0 if it is
* not given.
*/
int
tgetflag(id)
char *id;
{
register char *bp = tbuf;
for (;;) {
bp = tskip(bp);
if (!*bp)
return 0;
if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
if (!*bp || *bp == ':')
return 1;
else if (*bp == '@')
return 0;
}
}
}
/*
* Get a string valued option.
* These are given as
* %|cl=^Z|%
* Much decoding is done on the strings, and the strings are
* placed in area, which is a ref parameter which is updated.
* No checking on area overflow.
*/
char *
tgetstr(id, area)
char *id, **area;
{
register char *bp = tbuf;
for (;;) {
bp = tskip(bp);
if (!*bp)
return 0;
if (*bp++ != id[0] || *bp == '\0' || *bp++ != id[1])
continue;
if (*bp == '@')
return 0;
if (*bp != '=')
continue;
bp++;
return tdecode(bp, area);
}
}
/*
* @tdecode@ does the grunge work to decode the
* string capability escapes.
*/
static char *
tdecode(str, area)
register char *str;
char **area;
{
register char *cp;
register int c;
int i;
cp = *area;
while (c = *str++) {
if (c == ':' && *(cp-1) != '\\')
break;
*cp++ = c;
}
*cp++ = '\0';
str = *area;
*area = cp;
return str;
}