termo/driver-ti.c

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#include "termkey.h"
#include "termkey-internal.h"
#include <term.h>
#include <curses.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/* To be efficient at lookups, we store the byte sequence => keyinfo mapping
* in a trie. This avoids a slow linear search through a flat list of
* sequences. Because it is likely most nodes will be very sparse, we optimise
* vector to store an extent map after the database is loaded.
*/
typedef enum {
TYPE_KEY,
TYPE_ARR
} trie_nodetype;
struct trie_node {
trie_nodetype type;
};
struct trie_node_key {
trie_nodetype type;
struct keyinfo key;
};
struct trie_node_arr {
trie_nodetype type;
unsigned char min, max; /* INCLUSIVE endpoints of the extent range */
struct trie_node *arr[0];
};
typedef struct {
termkey_t *tk;
struct trie_node *root;
} termkey_ti;
static int funcname2keysym(const char *funcname, termkey_type *typep, termkey_keysym *symp, int *modmask, int *modsetp);
static int register_seq(termkey_ti *ti, const char *seq, termkey_type type, termkey_keysym sym, int modmask, int modset);
static struct trie_node *new_node_key(termkey_type type, termkey_keysym sym, int modmask, int modset)
{
struct trie_node_key *n = malloc(sizeof(struct trie_node_key));
if(!n)
return NULL;
n->type = TYPE_KEY;
n->key.type = type;
n->key.sym = sym;
n->key.modifier_mask = modmask;
n->key.modifier_set = modset;
return (struct trie_node*)n;
}
static struct trie_node *new_node_arr(unsigned char min, unsigned char max)
{
struct trie_node_arr *n = malloc(sizeof(struct trie_node_arr) + ((int)max-min+1) * sizeof(void*));
if(!n)
return NULL;
n->type = TYPE_ARR;
n->min = min; n->max = max;
int i;
for(i = min; i <= max; i++)
n->arr[i-min] = NULL;
return (struct trie_node*)n;
}
static struct trie_node *lookup_next(struct trie_node *n, unsigned char b)
{
switch(n->type) {
case TYPE_KEY:
fprintf(stderr, "ABORT: lookup_next within a TYPE_KEY node\n");
abort();
case TYPE_ARR:
{
struct trie_node_arr *nar = (struct trie_node_arr*)n;
if(b < nar->min || b > nar->max)
return NULL;
return nar->arr[b - nar->min];
}
}
return NULL; // Never reached but keeps compiler happy
}
static void free_trie(struct trie_node *n)
{
switch(n->type) {
case TYPE_KEY:
break;
case TYPE_ARR:
{
struct trie_node_arr *nar = (struct trie_node_arr*)n;
int i;
for(i = nar->min; i <= nar->max; i++)
if(nar->arr[i - nar->min])
free_trie(nar->arr[i - nar->min]);
break;
}
}
free(n);
}
static struct trie_node *compress_trie(struct trie_node *n)
{
if(!n)
return NULL;
switch(n->type) {
case TYPE_KEY:
return n;
case TYPE_ARR:
{
struct trie_node_arr *nar = (struct trie_node_arr*)n;
unsigned char min, max;
// Find the real bounds
for(min = 0; !nar->arr[min]; min++)
;
for(max = 0xff; !nar->arr[max]; max--)
;
struct trie_node_arr *new = (struct trie_node_arr*)new_node_arr(min, max);
int i;
for(i = min; i <= max; i++)
new->arr[i - min] = compress_trie(nar->arr[i]);
free(nar);
return (struct trie_node*)new;
}
}
return n;
}
static void *new_driver(termkey_t *tk, const char *term)
{
int err;
if(setupterm(term, 1, &err) != OK)
return NULL;
termkey_ti *ti = malloc(sizeof *ti);
if(!ti)
return NULL;
ti->tk = tk;
ti->root = new_node_arr(0, 0xff);
if(!ti->root)
goto abort_free_ti;
int i;
for(i = 0; strfnames[i]; i++) {
// Only care about the key_* constants
const char *name = strfnames[i];
if(strncmp(name, "key_", 4) != 0)
continue;
const char *value = tigetstr(strnames[i]);
if(!value || value == (char*)-1)
continue;
termkey_type type;
termkey_keysym sym;
int mask = 0;
int set = 0;
if(!funcname2keysym(strfnames[i] + 4, &type, &sym, &mask, &set))
continue;
if(sym != TERMKEY_SYM_NONE)
if(!register_seq(ti, value, type, sym, mask, set))
goto abort_free_trie;
}
ti->root = compress_trie(ti->root);
return ti;
abort_free_trie:
free_trie(ti->root);
abort_free_ti:
free(ti);
return NULL;
}
static void start_driver(termkey_t *tk, void *info)
{
/* The terminfo database will contain keys in application cursor key mode.
* We may need to enable that mode
*/
if(keypad_xmit) {
// Can't call putp or tputs because they suck and don't give us fd control
write(tk->fd, keypad_xmit, strlen(keypad_xmit));
}
}
static void stop_driver(termkey_t *tk, void *info)
{
if(keypad_local) {
// Can't call putp or tputs because they suck and don't give us fd control
write(tk->fd, keypad_local, strlen(keypad_local));
}
}
static void free_driver(void *info)
{
termkey_ti *ti = info;
free_trie(ti->root);
free(ti);
}
#define CHARAT(i) (tk->buffer[tk->buffstart + (i)])
static termkey_result getkey(termkey_t *tk, void *info, termkey_key *key, int force)
{
termkey_ti *ti = info;
if(tk->buffcount == 0)
return tk->is_closed ? TERMKEY_RES_EOF : TERMKEY_RES_NONE;
struct trie_node *p = ti->root;
int pos = 0;
while(pos < tk->buffcount) {
p = lookup_next(p, CHARAT(pos));
if(!p)
break;
pos++;
if(p->type == TYPE_KEY) {
struct trie_node_key *nk = (struct trie_node_key*)p;
key->type = nk->key.type;
key->code.sym = nk->key.sym;
key->modifiers = nk->key.modifier_set;
(*tk->method.eat_bytes)(tk, pos);
return TERMKEY_RES_KEY;
}
}
// If p is not NULL then we hadn't walked off the end yet, so we have a
// partial match
if(p && !force)
return TERMKEY_RES_AGAIN;
return TERMKEY_RES_NONE;
}
static struct {
const char *funcname;
termkey_type type;
termkey_keysym sym;
int mods;
} funcs[] =
{
/* THIS LIST MUST REMAIN SORTED! */
{ "backspace", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_BACKSPACE, 0 },
{ "begin", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_BEGIN, 0 },
{ "beg", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_BEGIN, 0 },
{ "btab", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_TAB, TERMKEY_KEYMOD_SHIFT },
{ "cancel", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_CANCEL, 0 },
{ "clear", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_CLEAR, 0 },
{ "close", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_CLOSE, 0 },
{ "command", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_COMMAND, 0 },
{ "copy", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_COPY, 0 },
{ "dc", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_DELETE, 0 },
{ "down", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_DOWN, 0 },
{ "end", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_END, 0 },
{ "enter", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_ENTER, 0 },
{ "exit", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_EXIT, 0 },
{ "find", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_FIND, 0 },
{ "help", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_HELP, 0 },
{ "home", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_HOME, 0 },
{ "ic", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_INSERT, 0 },
{ "left", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_LEFT, 0 },
{ "mark", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_MARK, 0 },
{ "message", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_MESSAGE, 0 },
{ "mouse", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_NONE, 0 },
{ "move", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_MOVE, 0 },
{ "next", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PAGEDOWN, 0 }, // Not quite, but it's the best we can do
{ "npage", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PAGEDOWN, 0 },
{ "open", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_OPEN, 0 },
{ "options", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_OPTIONS, 0 },
{ "ppage", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PAGEUP, 0 },
{ "previous", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PAGEUP, 0 }, // Not quite, but it's the best we can do
{ "print", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PRINT, 0 },
{ "redo", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_REDO, 0 },
{ "reference", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_REFERENCE, 0 },
{ "refresh", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_REFRESH, 0 },
{ "replace", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_REPLACE, 0 },
{ "restart", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_RESTART, 0 },
{ "resume", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_RESUME, 0 },
{ "right", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_RIGHT, 0 },
{ "save", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_SAVE, 0 },
{ "select", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_SELECT, 0 },
{ "suspend", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_SUSPEND, 0 },
{ "undo", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_UNDO, 0 },
{ "up", TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_UP, 0 },
{ NULL },
};
static int funcname2keysym(const char *funcname, termkey_type *typep, termkey_keysym *symp, int *modmaskp, int *modsetp)
{
// Binary search
int start = 0;
int end = sizeof(funcs)/sizeof(funcs[0]); // is "one past" the end of the range
while(1) {
int i = (start+end) / 2;
int cmp = strcmp(funcname, funcs[i].funcname);
if(cmp == 0) {
*typep = funcs[i].type;
*symp = funcs[i].sym;
*modmaskp = funcs[i].mods;
*modsetp = funcs[i].mods;
return 1;
}
else if(end == start + 1)
// That was our last choice and it wasn't it - not found
break;
else if(cmp > 0)
start = i;
else
end = i;
}
if(funcname[0] == 'f' && isdigit(funcname[1])) {
*typep = TERMKEY_TYPE_FUNCTION;
*symp = atoi(funcname + 1);
return 1;
}
// Last-ditch attempt; maybe it's a shift key?
if(funcname[0] == 's' && funcname2keysym(funcname + 1, typep, symp, modmaskp, modsetp)) {
*modmaskp |= TERMKEY_KEYMOD_SHIFT;
*modsetp |= TERMKEY_KEYMOD_SHIFT;
return 1;
}
#ifdef DEBUG
fprintf(stderr, "TODO: Need to convert funcname %s to a type/sym\n", funcname);
#endif
return 0;
}
static int register_seq(termkey_ti *ti, const char *seq, termkey_type type, termkey_keysym sym, int modmask, int modset)
{
int pos = 0;
struct trie_node *p = ti->root;
// Unsigned because we'll be using it as an array subscript
unsigned char b;
while((b = seq[pos])) {
struct trie_node *next = lookup_next(p, b);
if(!next)
break;
p = next;
pos++;
}
while((b = seq[pos])) {
struct trie_node *next;
if(seq[pos+1])
// Intermediate node
next = new_node_arr(0, 0xff);
else
// Final key node
next = new_node_key(type, sym, modmask, modset);
if(!next)
return 0;
switch(p->type) {
case TYPE_ARR:
{
struct trie_node_arr *nar = (struct trie_node_arr*)p;
if(b < nar->min || b > nar->max) {
fprintf(stderr, "ASSERT FAIL: Trie insert at 0x%02x is outside of extent bounds (0x%02x..0x%02x)\n",
b, nar->min, nar->max);
abort();
}
nar->arr[b - nar->min] = next;
p = next;
break;
}
case TYPE_KEY:
fprintf(stderr, "ASSERT FAIL: Tried to insert child node in TYPE_KEY\n");
abort();
}
pos++;
}
return 1;
}
struct termkey_driver termkey_driver_ti = {
2008-11-08 18:56:44 +01:00
.name = "terminfo",
.new_driver = new_driver,
.free_driver = free_driver,
.start_driver = start_driver,
.stop_driver = stop_driver,
.getkey = getkey,
};