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deb-goldedplus/goldlib/gall/gkbdunix.cpp

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// This may look like C code, but it is really -*- C++ -*-
// ------------------------------------------------------------------
// The Goldware Library
// Copyright (C) 1990-1999 Odinn Sorensen
// ------------------------------------------------------------------
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this program; if not, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA 02111-1307, USA
// ------------------------------------------------------------------
// $Id$
// ------------------------------------------------------------------
// Unix keyboard functions. Based on SLang source code.
// ------------------------------------------------------------------
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <termios.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <gutlunix.h>
#include <gsigunix.h>
#include <gkbdunix.h>
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#ifdef __BEOS__
//sz: some undocumented call that behaves in same manner as select ...
//used in BEOS_BONE builds ...
extern "C" int waiton( int, fd_set *, fd_set *, fd_set *, bigtime_t);
#endif
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// ------------------------------------------------------------------
int gkbd_stdin = -1;
// ------------------------------------------------------------------
static termios gkbd_oldtty;
// ------------------------------------------------------------------
static bool gkbd_tty_inited = false;
static bool gkbd_tty_open = false;
// ------------------------------------------------------------------
int gkbd_tty_init() {
gsig_block_signals();
gkbd_tty_open = false;
if((gkbd_stdin == -1) or (isatty(gkbd_stdin) != 1)) {
gkbd_stdin = open("/dev/tty", O_RDWR);
if(gkbd_stdin >= 0)
gkbd_tty_open = true;
if(not gkbd_tty_open) {
gkbd_stdin = fileno(stderr);
if(isatty(gkbd_stdin) != 1) {
gkbd_stdin = fileno (stdin);
if(isatty(gkbd_stdin) != 1)
return -1;
}
}
}
while(GET_TERMIOS(gkbd_stdin, &gkbd_oldtty) == -1) {
if(errno != EINTR) {
gsig_unblock_signals();
return -1;
}
}
termios newtty;
while(GET_TERMIOS(gkbd_stdin, &newtty) == -1) {
if(errno != EINTR) {
gsig_unblock_signals();
return -1;
}
}
newtty.c_oflag &= ~OPOST;
newtty.c_lflag = ISIG | NOFLSH;
newtty.c_iflag &= ~(ECHO | INLCR | ICRNL | IXON);
newtty.c_cc[VMIN] = 1;
newtty.c_cc[VEOF] = 1;
newtty.c_cc[VTIME] = 0;
newtty.c_cc[VINTR] = NULL_VALUE;
newtty.c_cc[VQUIT] = NULL_VALUE;
newtty.c_cc[VSUSP] = NULL_VALUE;
while(SET_TERMIOS(gkbd_stdin, &newtty) == -1) {
if(errno != EINTR) {
gsig_unblock_signals();
return -1;
}
}
gkbd_tty_inited = true;
gsig_unblock_signals();
return 0;
}
// ------------------------------------------------------------------
void gkbd_tty_reset() {
gsig_block_signals();
if(not gkbd_tty_inited) {
gsig_unblock_signals();
return;
}
while((SET_TERMIOS(gkbd_stdin, &gkbd_oldtty) == -1) and (errno == EINTR))
;
if(gkbd_tty_open) {
while((close(gkbd_stdin) == -1) and (errno == EINTR))
;
gkbd_tty_open = false;
gkbd_stdin = -1;
}
gkbd_tty_inited = false;
gsig_unblock_signals();
}
// ------------------------------------------------------------------
int gkbd_sys_input_pending(int tsecs) {
#if !defined(__BEOS__)
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static fd_set read_fd_set;
struct timeval wait;
long usecs, secs;
if(tsecs >= 0) {
secs = tsecs / 10;
usecs = (tsecs % 10) * 100000;
}
else {
tsecs = -tsecs;
secs = tsecs / 1000;
usecs = (tsecs % 1000) * 1000;
}
wait.tv_sec = secs;
wait.tv_usec = usecs;
FD_ZERO(&read_fd_set);
FD_SET(gkbd_stdin, &read_fd_set);
return select(gkbd_stdin+1, &read_fd_set, NULL, NULL, &wait);
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#else // BeOS input handling ...
#if defined(BEOS_BONE_BUILD)
static fd_set read_fd_set;
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FD_ZERO(&read_fd_set);
FD_SET(gkbd_stdin, &read_fd_set);
return waiton(gkbd_stdin+1, &read_fd_set, NULL, NULL, 0);
#else // not a BEOS_BONE_BUILD - use classical input check scheme ...
struct termios term, oterm;
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// get the terminal settings
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tcgetattr(gkbd_stdin, &oterm);
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// get a copy of the settings, which we modify
memcpy(&term, &oterm, sizeof(term));
// put the terminal in non-canonical mode, any
// reads timeout after 0.1 seconds or when a
// single character is read
term.c_lflag = term.c_lflag & (!ICANON);
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 1;
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tcsetattr(gkbd_stdin, TCSANOW, &term);
//check input
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int bytes = -1;
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ioctl(gkbd_stdin, TCWAITEVENT, &bytes);
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// reset the terminal to original state
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tcsetattr(gkbd_stdin, TCSANOW, &oterm);
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return bytes;
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#endif //defined(BEOS_BONE_BUILD)
#endif
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}
// ------------------------------------------------------------------
uint gkbd_sys_getkey() {
while(1) {
int ret = gkbd_sys_input_pending(100);
if(ret == 0)
continue;
if(ret != -1)
break;
if(errno == EINTR)
continue;
break;
}
char c;
while(read(gkbd_stdin, &c, 1) == -1) {
if(errno == EINTR)
continue;
if(errno == EAGAIN) {
sleep(1);
continue;
}
#ifndef __DJGPP__
if(errno == EWOULDBLOCK) {
sleep(1);
continue;
}
#endif
return (uint)-1;
}
return (uint)c;
}
// ------------------------------------------------------------------
uint gkbd_input_buffer_len = 0;
char gkbd_input_buffer[GKBD_MAX_INPUT_BUFFER_LEN];
// ------------------------------------------------------------------
uint gkbd_getkey() {
uint imax;
uint ch;
if(gkbd_input_buffer_len) {
ch = (uint)*gkbd_input_buffer;
gkbd_input_buffer_len--;
imax = gkbd_input_buffer_len;
memcpy(gkbd_input_buffer, gkbd_input_buffer+1, imax);
}
else {
ch = gkbd_sys_getkey();
}
return ch;
}
// ------------------------------------------------------------------
void gkbd_ungetkey_string(char *s, uint n) {
char* bmax;
char* b1;
char* b;
if(gkbd_input_buffer_len + n + 3 > GKBD_MAX_INPUT_BUFFER_LEN)
return;
b = gkbd_input_buffer;
bmax = (b - 1) + gkbd_input_buffer_len;
b1 = bmax + n;
while(bmax >= b)
*b1-- = *bmax--;
bmax = b + n;
while(b < bmax)
*b++ = *s++;
gkbd_input_buffer_len += n;
}
// ------------------------------------------------------------------
int gkbd_input_pending(int tsecs) {
if(gkbd_input_buffer_len)
return gkbd_input_buffer_len;
int n = gkbd_sys_input_pending(tsecs);
if(n <= 0)
return 0;
char c = (char)gkbd_getkey();
gkbd_ungetkey_string(&c, 1);
return n;
}
// ------------------------------------------------------------------
void gkbd_flush_input() {
gkbd_input_buffer_len = 0;
while(gkbd_sys_input_pending(0) > 0)
gkbd_sys_getkey();
}
// ------------------------------------------------------------------
struct gkbd_key_type {
char str[7];
bool active;
uint keysym;
gkbd_key_type* next;
};
// ------------------------------------------------------------------
#define UPPER_CASE_KEY(x) (((x) >= 'a') and ((x) <= 'z') ? (x) - 32 : (x))
#define LOWER_CASE_KEY(x) (((x) >= 'A') and ((x) <= 'Z') ? (x) + 32 : (x))
// ------------------------------------------------------------------
gkbd_key_type* gkbd_keymap = NULL;
// ------------------------------------------------------------------
void gkbd_keymap_init() {
gkbd_keymap = (gkbd_key_type*)calloc(256, sizeof(gkbd_key_type));
}
// ------------------------------------------------------------------
void gkbd_keymap_reset() {
if(gkbd_keymap) {
for(int n=0; n<256; n++) {
gkbd_key_type* next = gkbd_keymap[n].next;
while(next) {
gkbd_key_type* current = next;
next = current->next;
free(current);
}
}
free(gkbd_keymap);
gkbd_keymap = NULL;
}
}
// ------------------------------------------------------------------
static gkbd_key_type* malloc_key(char *str) {
gkbd_key_type* key = (gkbd_key_type*)malloc(sizeof(gkbd_key_type));
memset(key, 0, sizeof(gkbd_key_type));
memcpy(key->str, str, *str);
return key;
}
// ------------------------------------------------------------------
// Convert things like "^A" to 1 etc... The 0th char is the strlen
// INCLUDING the length character itself.
static char* gkbd_process_keystring(char* s) {
static char str[32];
char ch;
int i = 1;
while(*s != 0) {
ch = *s++;
if(ch == '^') {
ch = *s++;
if(ch == 0) {
if(i < 32)
str[i++] = '^';
break;
}
ch = UPPER_CASE_KEY(ch);
if(ch == '?')
ch = 127;
else
ch = ch - 'A' + 1;
}
if(i >= 32)
break;
str[i++] = ch;
}
str[0] = i;
return str;
}
// ------------------------------------------------------------------
static int key_string_compare(char* a, char* b, uint len) {
char* amax = a + len;
while(a < amax) {
int cha = *a++;
int chb = *b++;
if(cha == chb)
continue;
int cha_up = UPPER_CASE_KEY(cha);
int chb_up = UPPER_CASE_KEY(chb);
if(cha_up == chb_up) {
// Use case-sensitive result.
return cha - chb;
}
// Use case-insensitive result.
return cha_up - chb_up;
}
return 0;
}
// ------------------------------------------------------------------
// This function also performs an insertion in an ordered way.
static int find_the_key(char* s, gkbd_key_type** keyp) {
*keyp = NULL;
char* str = gkbd_process_keystring(s);
uint str_len = str[0];
if(str_len == 1)
return 0;
char ch = str[1];
gkbd_key_type* key = gkbd_keymap + ch;
if(str_len == 2) {
if(key->next)
return -2;
key->str[0] = str_len;
key->str[1] = ch;
*keyp = key;
return 0;
}
// insert the key definition
while(1) {
gkbd_key_type* last = key;
key = key->next;
if(key and key->str) {
uint key_len = key->str[0];
uint len = key_len;
if(len > str_len)
len = str_len;
int cmp = key_string_compare(str+1, key->str+1, len-1);
if(cmp > 0)
continue;
if(cmp == 0) {
if(key_len != str_len)
return -2;
*keyp = key;
return 0;
}
// Drop to cmp < 0 case
}
gkbd_key_type* neew = malloc_key(str);
neew->next = key;
last->next = neew;
*keyp = neew;
return 0;
}
}
// ------------------------------------------------------------------
int gkbd_define_keysym(char* s, uint keysym) {
gkbd_key_type* key;
int ret = find_the_key(s, &key);
if((ret != 0) or (key == NULL))
return ret;
key->active = true;
key->keysym = keysym;
return 0;
}
// ------------------------------------------------------------------
uint gkbd_last_key_char = 0;
static gkbd_key_type* gkbd_do_key() {
gkbd_last_key_char = gkbd_getkey();
if(gkbd_last_key_char == (uint)-1)
return NULL;
char input_ch = (char)gkbd_last_key_char;
gkbd_key_type* key = gkbd_keymap + input_ch;
// if the next one is null, then we know this MAY be it.
while(key->next == NULL) {
if(key->active)
return key;
// Try its opposite case counterpart
char chlow = LOWER_CASE_KEY(input_ch);
if(input_ch == chlow)
input_ch = UPPER_CASE_KEY(input_ch);
key = gkbd_keymap + input_ch;
if(not key->active)
return NULL;
}
if(gkbd_input_pending(1) == 0)
if(key->active)
return key;
// It appears to be a prefix character in a key sequence.
uint len = 1; // already read one character
key = key->next; // Now we are in the key list
gkbd_key_type* kmax = NULL; // set to end of list
gkbd_key_type* next;
while(1) {
gkbd_last_key_char = gkbd_getkey();
len++;
if(gkbd_last_key_char == (uint)-1)
break;
input_ch = (char)gkbd_last_key_char;
char key_ch = 0;
char chup = UPPER_CASE_KEY(input_ch);
while(key != kmax) {
if(key->str[0] > len) {
key_ch = key->str[len];
if(chup == UPPER_CASE_KEY(key_ch))
break;
}
key = key->next;
}
if(key == kmax)
break;
// If the input character is lowercase, check to see if there is
// a lowercase match. If so, set key to it. Note: the
// algorithm assumes the sorting performed by key_string_compare.
if(input_ch != key_ch) {
next = key->next;
while(next != kmax) {
if(next->str[0] > len) {
char next_ch = next->str[len];
if(next_ch == input_ch) {
key = next;
break;
}
if(next_ch != chup)
break;
}
next = next->next;
}
}
// Ok, we found the first position of a possible match. If it
// is exact, we are done.
if(key->str[0] == len + 1)
return key;
// Apparently, there are some ambiguities. Read next key to
// resolve the ambiguity. Adjust kmax to encompass ambiguities.
next = key->next;
while(next != kmax) {
if(next->str[0] > len) {
char key_ch = next->str[len];
if(chup != UPPER_CASE_KEY(key_ch))
break;
}
next = next->next;
}
kmax = next;
}
return NULL;
}
// ------------------------------------------------------------------
uint gkbd_getmappedkey() {
gkbd_key_type* key = gkbd_do_key();
if((key == NULL) or (not key->active)) {
gkbd_flush_input();
return (uint)-1;
}
return key->keysym;
}
// ------------------------------------------------------------------