// SPDX-License-Identifier: GPL-2.0+
/* speakup_keyhelp.c
* help module for speakup
*
*written by David Borowski.
*
* Copyright (C) 2003 David Borowski.
*/
#include <linux/keyboard.h>
#include "spk_priv.h"
#include "speakup.h"
#define MAXFUNCS 130
#define MAXKEYS 256
static const int num_key_names = MSG_KEYNAMES_END - MSG_KEYNAMES_START + 1;
static u_short key_offsets[MAXFUNCS], key_data[MAXKEYS];
static u_short masks[] = { 32, 16, 8, 4, 2, 1 };
static short letter_offsets[26] = {
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1 };
static u_char funcvals[] = {
ATTRIB_BLEEP_DEC, ATTRIB_BLEEP_INC, BLEEPS_DEC, BLEEPS_INC,
SAY_FIRST_CHAR, SAY_LAST_CHAR, SAY_CHAR, SAY_CHAR_NUM,
SAY_NEXT_CHAR, SAY_PHONETIC_CHAR, SAY_PREV_CHAR, SPEAKUP_PARKED,
SPEAKUP_CUT, EDIT_DELIM, EDIT_EXNUM, EDIT_MOST,
EDIT_REPEAT, EDIT_SOME, SPEAKUP_GOTO, BOTTOM_EDGE,
LEFT_EDGE, RIGHT_EDGE, TOP_EDGE, SPEAKUP_HELP,
SAY_LINE, SAY_NEXT_LINE, SAY_PREV_LINE, SAY_LINE_INDENT,
SPEAKUP_PASTE, PITCH_DEC, PITCH_INC, PUNCT_DEC,
PUNCT_INC, PUNC_LEVEL_DEC, PUNC_LEVEL_INC, SPEAKUP_QUIET,
RATE_DEC, RATE_INC, READING_PUNC_DEC, READING_PUNC_INC,
SAY_ATTRIBUTES, SAY_FROM_LEFT, SAY_FROM_TOP, SAY_POSITION,
SAY_SCREEN, SAY_TO_BOTTOM, SAY_TO_RIGHT, SPK_KEY,
SPK_LOCK, SPEAKUP_OFF, SPEECH_KILL, SPELL_DELAY_DEC,
SPELL_DELAY_INC, SPELL_WORD, SPELL_PHONETIC, TONE_DEC,
TONE_INC, VOICE_DEC, VOICE_INC, VOL_DEC,
VOL_INC, CLEAR_WIN, SAY_WIN, SET_WIN,
ENABLE_WIN, SAY_WORD, SAY_NEXT_WORD, SAY_PREV_WORD, 0
};
static u_char *state_tbl;
static int cur_item, nstates;
static void build_key_data(void)
{
u_char *kp, counters[MAXFUNCS], ch, ch1;
u_short *p_key, key;
int i, offset = 1;
nstates = (int)(state_tbl[-1]);
memset(counters, 0, sizeof(counters));
memset(key_offsets, 0, sizeof(key_offsets));
kp = state_tbl + nstates + 1;
while (*kp++) {
/* count occurrences of each function */
for (i = 0; i < nstates; i++, kp++) {
if (!*kp)
continue;
if ((state_tbl[i] & 16) != 0 && *kp == SPK_KEY)
continue;
counters[*kp]++;
}
}
for (i = 0; i < MAXFUNCS; i++) {
if (counters[i] == 0)
continue;
key_offsets[i] = offset;
offset += (counters[i] + 1);
if (offset >= MAXKEYS)
break;
}
/* leave counters set so high keycodes come first.
* this is done so num pad and other extended keys maps are spoken before
* the alpha with speakup type mapping.
*/
kp = state_tbl + nstates + 1;
while ((ch = *kp++)) {
for (i = 0; i < nstates; i++) {
ch1 = *kp++;
if (!ch1)
continue;
if ((state_tbl[i] & 16) != 0 && ch1 == SPK_KEY)
continue;
key = (state_tbl[i] << 8) + ch;
counters[ch1]--;
offset = key_offsets[ch1];
if (!offset)
continue;
p_key = key_data + offset + counters[ch1];
*p_key = key;
}
}
}
static void say_key(int key)
{
int i, state = key >> 8;
key &= 0xff;
for (i = 0; i < 6; i++) {
if (state & masks[i])
synth_printf(" %s", spk_msg_get(MSG_STATES_START + i));
}
if ((key > 0) && (key <= num_key_names))
synth_printf(" %s\n",
spk_msg_get(MSG_KEYNAMES_START + (key - 1)));
}
static int help_init(void)
{
char start = SPACE;
int i;
int num_funcs = MSG_FUNCNAMES_END - MSG_FUNCNAMES_START + 1;
state_tbl = spk_our_keys[0] + SHIFT_TBL_SIZE + 2;
for (i = 0; i < num_funcs; i++) {
char *cur_funcname = spk_msg_get(MSG_FUNCNAMES_START + i);
if (start == *cur_funcname)
continue;
start = *cur_funcname;
letter_offsets[(start & 31) - 1] = i;
}
return 0;
}
int spk_handle_help(struct vc_data *vc, u_char type, u_char ch, u_short key)
{
int i, n;
char *name;
u_char func, *kp;
u_short *p_keys, val;
if (letter_offsets[0] == -1)
help_init();
if (type == KT_LATIN) {
if (ch == SPACE) {
spk_special_handler = NULL;
synth_printf("%s\n", spk_msg_get(MSG_LEAVING_HELP));
return 1;
}
ch |= 32; /* lower case */
if (ch < 'a' || ch > 'z')
return -1;
if (letter_offsets[ch - 'a'] == -1) {
synth_printf(spk_msg_get(MSG_NO_COMMAND), ch);
synth_printf("\n");
return 1;
}
cur_item = letter_offsets[ch - 'a'];
} else if (type == KT_CUR) {
if (ch == 0 &&
(MSG_FUNCNAMES_START + cur_item + 1) <= MSG_FUNCNAMES_END)
cur_item++;
else if (ch == 3 && cur_item > 0)
cur_item--;
else
return -1;
} else if (type == KT_SPKUP && ch == SPEAKUP_HELP &&
!spk_special_handler) {
spk_special_handler = spk_handle_help;
synth_printf("%s\n", spk_msg_get(MSG_HELP_INFO));
build_key_data(); /* rebuild each time in case new mapping */
return 1;
} else {
name = NULL;
if ((type != KT_SPKUP) && (key > 0) && (key <= num_key_names)) {
synth_printf("%s\n",
spk_msg_get(MSG_KEYNAMES_START + key - 1));
return 1;
}
for (i = 0; funcvals[i] != 0 && !name; i++) {
if (ch == funcvals[i])
name = spk_msg_get(MSG_FUNCNAMES_START + i);
}
if (!name)
return -1;
kp = spk_our_keys[key] + 1;
for (i = 0; i < nstates; i++) {
if (ch == kp[i])
break;
}
key += (state_tbl[i] << 8);
say_key(key);
synth_printf(spk_msg_get(MSG_KEYDESC), name);
synth_printf("\n");
return 1;
}
name = spk_msg_get(MSG_FUNCNAMES_START + cur_item);
func = funcvals[cur_item];
synth_printf("%s", name);
if (key_offsets[func] == 0) {
synth_printf(" %s\n", spk_msg_get(MSG_IS_UNASSIGNED));
return 1;
}
p_keys = key_data + key_offsets[func];
for (n = 0; p_keys[n]; n++) {
val = p_keys[n];
if (n > 0)
synth_printf("%s ", spk_msg_get(MSG_DISJUNCTION));
say_key(val);
}
return 1;
}
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