minix/commands/yap/keys.c

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2005-04-21 16:53:53 +02:00
/* Copyright (c) 1985 Ceriel J.H. Jacobs */
# ifndef lint
static char rcsid[] = "$Header$";
# endif
# define _KEYS_
# include <ctype.h>
# include "in_all.h"
# include "machine.h"
# include "keys.h"
# include "commands.h"
# include "prompt.h"
# include "assert.h"
char defaultmap[] = "\
bf=P:bl=k:bl=^K:bl=^[[A:bot=l:bot=$:bot=^[[Y:bp=-:bp=^[[V:bs=^B:bse=?:bsl=S:\
bsp=F:chm=X:exg=x:ff=N:fl=^J:fl=^M:fl=j:fl=^[[B:fp= :fp=^[[U:fs=^D:fse=/:\
fsl=s:fsp=f:hlp=h:nse=n:nsr=r:red=^L:rep=.:bps=Z:bss=b:fps=z:fss=d:shl=!:\
tom=':top=\\^:top=^[[H:vis=e:wrf=w:qui=q:qui=Q:mar=m:pip=|";
char *strcpy();
char *strcat();
char *getenv();
/*
* Construct an error message and return it
*/
STATIC char *
kerror(key, emess) char *key, *emess; {
static char ebuf[80]; /* Room for the error message */
(VOID) strcpy(ebuf, key);
(VOID) strcat(ebuf, emess);
return ebuf;
}
/*
* Compile a keymap into commtable. Returns an error message if there
* is one
*/
STATIC char *
compile(map, commtable)
register char *map; register struct keymap *commtable; {
register char *mark; /* Indicates start of mnemonic */
register char *c; /* Runs through buf */
register int temp;
char *escapes = commtable->k_esc;
char buf[10]; /* Will hold key sequence */
(VOID) strcpy(commtable->k_help,"Illegal command");
while (*map) {
c = buf;
mark = map; /* Start of mnemonic */
while (*map && *map != '=') {
map++;
}
if (!*map) {
/*
* Mnemonic should end with '='
*/
return kerror(mark, ": Syntax error");
}
*map++ = 0;
while (*map) {
/*
* Get key sequence
*/
if (*map == ':') {
/*
* end of key sequence
*/
map++;
break;
}
*c = *map++ & 0177;
if (*c == '^' || *c == '\\') {
if (!(temp = *map++)) {
/*
* Escape not followed by a character
*/
return kerror(mark, ": Syntax error");
}
if (*c == '^') {
if (temp == '?') *c = 0177;
else *c = temp & 037;
}
else *c = temp & 0177;
}
setused(*c);
c++;
if (c >= &buf[9]) {
return kerror(mark,": Key sequence too long");
}
}
*c = 0;
if (!(temp = lookup(mark))) {
return kerror(mark,": Nonexistent function");
}
if (c == &buf[1] && (commands[temp].c_flags & ESC) &&
escapes < &(commtable->k_esc[sizeof(commtable->k_esc)-1])) {
*escapes++ = buf[0] & 0177;
}
temp = addstring(buf, temp, &(commtable->k_mach));
if (temp == FSM_ISPREFIX) {
return kerror(mark,": Prefix of other key sequence");
}
if (temp == FSM_HASPREFIX) {
return kerror(mark,": Other key sequence is prefix");
}
assert(temp == FSM_OKE);
if (!strcmp(mark, "hlp")) {
/*
* Create an error message to be given when the user
* types an illegal command
*/
(VOID) strcpy(commtable->k_help, "Type ");
(VOID) strcat(commtable->k_help, buf);
(VOID) strcat(commtable->k_help, " for help");
}
}
*escapes = 0;
return (char *) 0;
}
/*
* Initialize the keymaps
*/
VOID
initkeys() {
register char *p;
static struct keymap xx[2];
currmap = &xx[0];
othermap = &xx[1];
p = compile(defaultmap, currmap); /* Compile default map */
assert(p == (char *) 0);
p = getenv("YAPKEYS");
if (p) {
if (!(p = compile(p, othermap))) {
/*
* No errors in user defined keymap. So, use it
*/
do_chkm(0L);
return;
}
error(p);
}
othermap = 0; /* No other keymap */
}
int
is_escape(c)
{
register char *p = currmap->k_esc;
while (*p) {
if (c == *p++) return 1;
}
return 0;
}
static char keyset[16]; /* bitset indicating which keys are
* used
*/
/*
* Mark key "key" as used
*/
VOID
setused(key) int key; {
keyset[(key & 0177) >> 3] |= (1 << (key & 07));
}
/*
* return non-zero if key "key" is used in a keymap
*/
int
isused(key) int key; {
return keyset[(key & 0177) >> 3] & (1 << (key & 07));
}