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/* $NetBSD: getch.c,v 1.29.4.3 2000/09/29 12:33:52 itojun Exp $ */

/*
* Copyright (c) 1981, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)getch.c 8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: getch.c,v 1.29.4.3 2000/09/29 12:33:52 itojun Exp $");
#endif
#endif /* not lint */

#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include "curses.h"
#include "curses_private.h"

/* defined in setterm.c */
extern struct tinfo *_cursesi_genbuf;

#define DEFAULT_DELAY 2 /* default delay for timeout() */

/*
* Keyboard input handler. Do this by snarfing
* all the info we can out of the termcap entry for TERM and putting it
* into a set of keymaps. A keymap is an array the size of all the possible
* single characters we can get, the contents of the array is a structure
* that contains the type of entry this character is (i.e. part/end of a
* multi-char sequence or a plain char) and either a pointer which will point
* to another keymap (in the case of a multi-char sequence) OR the data value
* that this key should return.
*
*/

/* private data structures for holding the key definitions */
typedef struct keymap keymap_t;
typedef struct key_entry key_entry_t;

struct key_entry {
short type; /* type of key this is */
union {
keymap_t *next; /* next keymap is key is multi-key sequence */
wchar_t symbol; /* key symbol if key is a leaf entry */
} value;
};
/* Types of key structures we can have */
#define KEYMAP_MULTI 1 /* part of a multi char sequence */
#define KEYMAP_LEAF 2 /* key has a symbol associated with it, either
* it is the end of a multi-char sequence or a
* single char key that generates a symbol */

/* allocate this many key_entry structs at once to speed start up must
* be a power of 2.
*/
#define KEYMAP_ALLOC_CHUNK 4

/* The max number of different chars we can receive */
#define MAX_CHAR 256

struct keymap {
int count; /* count of number of key structs allocated */
short mapping[MAX_CHAR]; /* mapping of key to allocated structs */
key_entry_t **key; /* dynamic array of keys */
};


/* Key buffer */
#define INBUF_SZ 16 /* size of key buffer - must be larger than
* longest multi-key sequence */
static wchar_t inbuf[INBUF_SZ];
static int start, end, working; /* pointers for manipulating inbuf data */

#define INC_POINTER(ptr) do { \
(ptr)++; \
ptr %= INBUF_SZ; \
} while(/*CONSTCOND*/0)

static short state; /* state of the inkey function */

#define INKEY_NORM 0 /* no key backlog to process */
#define INKEY_ASSEMBLING 1 /* assembling a multi-key sequence */
#define INKEY_BACKOUT 2 /* recovering from an unrecognised key */
#define INKEY_TIMEOUT 3 /* multi-key sequence timeout */

/* The termcap data we are interested in and the symbols they map to */
struct tcdata {
const char *name; /* name of termcap entry */
wchar_t symbol; /* the symbol associated with it */
};

static const struct tcdata tc[] = {
{"!1", KEY_SSAVE},
{"!2", KEY_SSUSPEND},
{"!3", KEY_SUNDO},
{"#1", KEY_SHELP},
{"#2", KEY_SHOME},
{"#3", KEY_SIC},
{"#4", KEY_SLEFT},
{"%0", KEY_REDO},
{"%1", KEY_HELP},
{"%2", KEY_MARK},
{"%3", KEY_MESSAGE},
{"%4", KEY_MOVE},
{"%5", KEY_NEXT},
{"%6", KEY_OPEN},
{"%7", KEY_OPTIONS},
{"%8", KEY_PREVIOUS},
{"%9", KEY_PRINT},
{"%a", KEY_SMESSAGE},
{"%b", KEY_SMOVE},
{"%c", KEY_SNEXT},
{"%d", KEY_SOPTIONS},
{"%e", KEY_SPREVIOUS},
{"%f", KEY_SPRINT},
{"%g", KEY_SREDO},
{"%h", KEY_SREPLACE},
{"%i", KEY_SRIGHT},
{"%j", KEY_SRSUME},
{"&0", KEY_SCANCEL},
{"&1", KEY_REFERENCE},
{"&2", KEY_REFRESH},
{"&3", KEY_REPLACE},
{"&4", KEY_RESTART},
{"&5", KEY_RESUME},
{"&6", KEY_SAVE},
{"&7", KEY_SUSPEND},
{"&8", KEY_UNDO},
{"&9", KEY_SBEG},
{"*0", KEY_SFIND},
{"*1", KEY_SCOMMAND},
{"*2", KEY_SCOPY},
{"*3", KEY_SCREATE},
{"*4", KEY_SDC},
{"*5", KEY_SDL},
{"*6", KEY_SELECT},
{"*7", KEY_SEND},
{"*8", KEY_SEOL},
{"*9", KEY_SEXIT},
{"@0", KEY_FIND},
{"@1", KEY_BEG},
{"@2", KEY_CANCEL},
{"@3", KEY_CLOSE},
{"@4", KEY_COMMAND},
{"@5", KEY_COPY},
{"@6", KEY_CREATE},
{"@7", KEY_END},
{"@8", KEY_ENTER},
{"@9", KEY_EXIT},
{"F1", KEY_F(11)},
{"F2", KEY_F(12)},
{"F3", KEY_F(13)},
{"F4", KEY_F(14)},
{"F5", KEY_F(15)},
{"F6", KEY_F(16)},
{"F7", KEY_F(17)},
{"F8", KEY_F(18)},
{"F9", KEY_F(19)},
{"FA", KEY_F(20)},
{"FB", KEY_F(21)},
{"FC", KEY_F(22)},
{"FD", KEY_F(23)},
{"FE", KEY_F(24)},
{"FF", KEY_F(25)},
{"FG", KEY_F(26)},
{"FH", KEY_F(27)},
{"FI", KEY_F(28)},
{"FJ", KEY_F(29)},
{"FK", KEY_F(30)},
{"FL", KEY_F(31)},
{"FM", KEY_F(32)},
{"FN", KEY_F(33)},
{"FO", KEY_F(34)},
{"FP", KEY_F(35)},
{"FQ", KEY_F(36)},
{"FR", KEY_F(37)},
{"FS", KEY_F(38)},
{"FT", KEY_F(39)},
{"FU", KEY_F(40)},
{"FV", KEY_F(41)},
{"FW", KEY_F(42)},
{"FX", KEY_F(43)},
{"FY", KEY_F(44)},
{"FZ", KEY_F(45)},
{"Fa", KEY_F(46)},
{"Fb", KEY_F(47)},
{"Fc", KEY_F(48)},
{"Fd", KEY_F(49)},
{"Fe", KEY_F(50)},
{"Ff", KEY_F(51)},
{"Fg", KEY_F(52)},
{"Fh", KEY_F(53)},
{"Fi", KEY_F(54)},
{"Fj", KEY_F(55)},
{"Fk", KEY_F(56)},
{"Fl", KEY_F(57)},
{"Fm", KEY_F(58)},
{"Fn", KEY_F(59)},
{"Fo", KEY_F(60)},
{"Fp", KEY_F(61)},
{"Fq", KEY_F(62)},
{"Fr", KEY_F(63)},
{"K1", KEY_A1},
{"K2", KEY_B2},
{"K3", KEY_A3},
{"K4", KEY_C1},
{"K5", KEY_C3},
{"Km", KEY_MOUSE},
{"k0", KEY_F0},
{"k1", KEY_F(1)},
{"k2", KEY_F(2)},
{"k3", KEY_F(3)},
{"k4", KEY_F(4)},
{"k5", KEY_F(5)},
{"k6", KEY_F(6)},
{"k7", KEY_F(7)},
{"k8", KEY_F(8)},
{"k9", KEY_F(9)},
{"k;", KEY_F(10)},
{"kA", KEY_IL},
{"ka", KEY_CATAB},
{"kB", KEY_BTAB},
{"kb", KEY_BACKSPACE},
{"kC", KEY_CLEAR},
{"kD", KEY_DC},
{"kd", KEY_DOWN},
{"kE", KEY_EOL},
{"kF", KEY_SF},
{"kH", KEY_LL},
{"kh", KEY_HOME},
{"kI", KEY_IC},
{"kL", KEY_DL},
{"kl", KEY_LEFT},
{"kM", KEY_EIC},
{"kN", KEY_NPAGE},
{"kP", KEY_PPAGE},
{"kR", KEY_SR},
{"kr", KEY_RIGHT},
{"kS", KEY_EOS},
{"kT", KEY_STAB},
{"kt", KEY_CTAB},
{"ku", KEY_UP}
};
/* Number of TC entries .... */
static const int num_tcs = (sizeof(tc) / sizeof(struct tcdata));

/* The root keymap */

static keymap_t *base_keymap;

/* prototypes for private functions */
static key_entry_t *add_new_key(keymap_t *current, char chr, int key_type,
int symbol);
static keymap_t *new_keymap(void); /* create a new keymap */
static key_entry_t *new_key(void); /* create a new key entry */
static wchar_t inkey(int to, int delay);

/*
* Add a new key entry to the keymap pointed to by current. Entry
* contains the character to add to the keymap, type is the type of
* entry to add (either multikey or leaf) and symbol is the symbolic
* value for a leaf type entry. The function returns a pointer to the
* new keymap entry.
*/
static key_entry_t *
add_new_key(keymap_t *current, char chr, int key_type, int symbol)
{
key_entry_t *the_key;
        int i;

#ifdef DEBUG
__CTRACE("Adding character %s of type %d, symbol 0x%x\n", unctrl(chr),
key_type, symbol);
#endif
if (current->mapping[(unsigned) chr] < 0) {
/* first time for this char */
current->mapping[(unsigned) chr] = current->count; /* map new entry */
/* make sure we have room in the key array first */
if ((current->count & (KEYMAP_ALLOC_CHUNK - 1)) == 0)
{
if ((current->key =
realloc(current->key,
(current->count) * sizeof(key_entry_t *)
+ KEYMAP_ALLOC_CHUNK * sizeof(key_entry_t *))) == NULL) {
fprintf(stderr,
"Could not malloc for key entry\n");
exit(1);
}

the_key = new_key();
                        for (i = 0; i < KEYMAP_ALLOC_CHUNK; i++) {
                                current->key[current->count + i]
= &the_key[i];
                        }
                }
                
                  /* point at the current key array element to use */
                the_key = current->key[current->count];
                                                
the_key->type = key_type;

switch (key_type) {
case KEYMAP_MULTI:
/* need for next key */
#ifdef DEBUG
__CTRACE("Creating new keymap\n");
#endif
the_key->value.next = new_keymap();
break;

case KEYMAP_LEAF:
/* the associated symbol for the key */
#ifdef DEBUG
__CTRACE("Adding leaf key\n");
#endif
the_key->value.symbol = symbol;
break;

default:
fprintf(stderr, "add_new_key: bad type passed\n");
exit(1);
}

current->count++;
} else {
/* the key is already known - just return the address. */
#ifdef DEBUG
__CTRACE("Keymap already known\n");
#endif
the_key = current->key[current->mapping[(unsigned) chr]];
}

        return the_key;
}

/*
* Init_getch - initialise all the pointers & structures needed to make
* getch work in keypad mode.
*
*/
void
__init_getch(void)
{
char entry[1024], *p;
int i, j, length, key_ent;
size_t limit;
key_entry_t *tmp_key;
keymap_t *current;
char *cp;
#ifdef DEBUG
int k;
#endif

/* init the inkey state variable */
state = INKEY_NORM;

/* init the base keymap */
base_keymap = new_keymap();

/* key input buffer pointers */
start = end = working = 0;

/* now do the termcap snarfing ... */
for (i = 0; i < num_tcs; i++) {
p = entry;
limit = 1023;
cp = t_getstr(_cursesi_genbuf, tc[i].name, &p, &limit);
if (cp != NULL) {
free(cp);
current = base_keymap; /* always start with
* base keymap. */
length = (int) strlen(entry);
#ifdef DEBUG
__CTRACE("Processing termcap entry %s, sequence ",
tc[i].name);
for (k = 0; k <= length -1; k++)
__CTRACE("%s", unctrl(entry[k]));
__CTRACE("\n");
#endif
for (j = 0; j < length - 1; j++) {
/* add the entry to the struct */
tmp_key = add_new_key(current,
entry[j],
KEYMAP_MULTI, 0);

/* index into the key array - it's
clearer if we stash this */
key_ent = current->mapping[
(unsigned) entry[j]];

current->key[key_ent] = tmp_key;

/* next key uses this map... */
current = current->key[key_ent]->value.next;
}

/* this is the last key in the sequence (it
* may have been the only one but that does
* not matter) this means it is a leaf key and
* should have a symbol associated with it.
*/
tmp_key = add_new_key(current,
entry[length - 1],
KEYMAP_LEAF,
tc[i].symbol);
current->key[
current->mapping[(int)entry[length - 1]]] =
tmp_key;
}
}
}


/*
* new_keymap - allocates & initialises a new keymap structure. This
* function returns a pointer to the new keymap.
*
*/
static keymap_t *
new_keymap(void)
{
int i;
keymap_t *new_map;

if ((new_map = malloc(sizeof(keymap_t))) == NULL) {
perror("Inkey: Cannot allocate new keymap");
exit(2);
}

/* Initialise the new map */
new_map->count = 0;
for (i = 0; i < MAX_CHAR; i++) {
new_map->mapping[i] = -1; /* no mapping for char */
}

/* key array will be allocated when first key is added */
new_map->key = NULL;

return new_map;
}

/*
* new_key - allocates & initialises a new key entry. This function returns
* a pointer to the newly allocated key entry.
*
*/
static key_entry_t *
new_key(void)
{
key_entry_t *new_one;
int i;

if ((new_one = malloc(KEYMAP_ALLOC_CHUNK * sizeof(key_entry_t)))
== NULL) {
perror("inkey: Cannot allocate new key entry chunk");
exit(2);
}

for (i = 0; i < KEYMAP_ALLOC_CHUNK; i++) {
new_one[i].type = 0;
new_one[i].value.next = NULL;
}

return new_one;
}

/*
* inkey - do the work to process keyboard input, check for multi-key
* sequences and return the appropriate symbol if we get a match.
*
*/

wchar_t
inkey(int to, int delay)
{
wchar_t k;
int c;
keymap_t *current = base_keymap;

k = 0; /* XXX gcc -Wuninitialized */

for (;;) { /* loop until we get a complete key sequence */
reread:
if (state == INKEY_NORM) {
if (delay && __timeout(delay) == ERR)
return ERR;
if ((c = getchar()) == EOF) {
clearerr(stdin);
return ERR;
}

if (delay && (__notimeout() == ERR))
return ERR;

k = (wchar_t) c;
#ifdef DEBUG
__CTRACE("inkey (state normal) got '%s'\n", unctrl(k));
#endif

working = start;
inbuf[working] = k;
INC_POINTER(working);
end = working;
state = INKEY_ASSEMBLING; /* go to the assembling
* state now */
} else if (state == INKEY_BACKOUT) {
k = inbuf[working];
INC_POINTER(working);
if (working == end) { /* see if we have run
* out of keys in the
* backlog */

/* if we have then switch to
assembling */
state = INKEY_ASSEMBLING;
}
} else if (state == INKEY_ASSEMBLING) {
/* assembling a key sequence */
if (delay) {
if (__timeout(to ? DEFAULT_DELAY : delay) == ERR)
return ERR;
} else {
if (to && (__timeout(DEFAULT_DELAY) == ERR))
return ERR;
}

c = getchar();
if (ferror(stdin)) {
clearerr(stdin);
return ERR;
}

if ((to || delay) && (__notimeout() == ERR))
return ERR;

k = (wchar_t) c;
#ifdef DEBUG
__CTRACE("inkey (state assembling) got '%s'\n", unctrl(k));
#endif
if (feof(stdin)) { /* inter-char timeout,
* start backing out */
clearerr(stdin);
if (start == end)
/* no chars in the buffer, restart */
goto reread;

k = inbuf[start];
state = INKEY_TIMEOUT;
} else {
inbuf[working] = k;
INC_POINTER(working);
end = working;
}
} else {
fprintf(stderr, "Inkey state screwed - exiting!!!");
exit(2);
}

/* Check key has no special meaning and we have not timed out */
if ((state == INKEY_TIMEOUT) || (current->mapping[k] < 0)) {
/* return the first key we know about */
k = inbuf[start];

INC_POINTER(start);
working = start;

if (start == end) { /* only one char processed */
state = INKEY_NORM;
} else {/* otherwise we must have more than one char
* to backout */
state = INKEY_BACKOUT;
}
return k;
} else { /* must be part of a multikey sequence */
/* check for completed key sequence */
if (current->key[current->mapping[k]]->type == KEYMAP_LEAF) {
start = working; /* eat the key sequence
* in inbuf */

/* check if inbuf empty now */
if (start == end) {
/* if it is go back to normal */
state = INKEY_NORM;
} else {
/* otherwise go to backout state */
state = INKEY_BACKOUT;
}

/* return the symbol */
return current->key[current->mapping[k]]->value.symbol;

} else {
/*
* Step on to next part of the multi-key
* sequence.
*/
current = current->key[current->mapping[k]]->value.next;
}
}
}
}

#ifndef _CURSES_USE_MACROS
/*
* getch --
* Read in a character from stdscr.
*/
int
getch(void)
{
return wgetch(stdscr);
}

/*
* mvgetch --
* Read in a character from stdscr at the given location.
*/
int
mvgetch(int y, int x)
{
return mvwgetch(stdscr, y, x);
}

/*
* mvwgetch --
* Read in a character from stdscr at the given location in the
* given window.
*/
int
mvwgetch(WINDOW *win, int y, int x)
{
if (wmove(win, y, x) == ERR)
return ERR;

return wgetch(win);
}

#endif

/*
* wgetch --
* Read in a character from the window.
*/
int
wgetch(WINDOW *win)
{
int inp, weset;
int c;

if (!(win->flags & __SCROLLOK) && (win->flags & __FULLWIN)
&& win->curx == win->maxx - 1 && win->cury == win->maxy - 1
&& __echoit)
return (ERR);

if (is_wintouched(win))
wrefresh(win);
#ifdef DEBUG
__CTRACE("wgetch: __echoit = %d, __rawmode = %d, flags = %0.2o\n",
__echoit, __rawmode, win->flags);
#endif
if (__echoit && !__rawmode) {
cbreak();
weset = 1;
} else
weset = 0;

__save_termios();

if (win->flags & __KEYPAD) {
switch (win->delay)
{
case -1:
inp = inkey (win->flags & __NOTIMEOUT ? 0 : 1, 0);
break;
case 0:
if (__nodelay() == ERR) {
__restore_termios();
return ERR;
}
inp = inkey(0, 0);
break;
default:
inp = inkey(win->flags & __NOTIMEOUT ? 0 : 1, win->delay);
break;
}
} else {
switch (win->delay)
{
case -1:
break;
case 0:
if (__nodelay() == ERR) {
__restore_termios();
return ERR;
}
break;
default:
if (__timeout(win->delay) == ERR) {
__restore_termios();
return ERR;
}
break;
}

c = getchar();
if (feof(stdin)) {
clearerr(stdin);
__restore_termios();
return ERR; /* we have timed out */
}

if (ferror(stdin)) {
clearerr(stdin);
inp = ERR;
} else {
inp = c;
}
}
#ifdef DEBUG
if (inp > 255)
/* we have a key symbol - treat it differently */
/* XXXX perhaps __unctrl should be expanded to include
* XXXX the keysyms in the table....
*/
__CTRACE("wgetch assembled keysym 0x%x\n", inp);
else
__CTRACE("wgetch got '%s'\n", unctrl(inp));
#endif
if (win->delay > -1) {
if (__delay() == ERR) {
__restore_termios();
return ERR;
}
}

__restore_termios();

if (__echoit)
waddch(win, (chtype) inp);

if (weset)
nocbreak();

return ((inp < 0) || (inp == ERR) ? ERR : inp);
}

/*
* ungetch --
* Put the character back into the input queue.
*/
int
ungetch(int c)
{
return ((ungetc(c, stdin) == EOF) ? ERR : OK);
}
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