void console_write_char(char ch) {
switch(ch) {
case '\n':
xpos = 0;
ypos++;
break;
case '\t':
xpos += 8 - (xpos % 8);
break;
case '\b':
if(xpos > 0) {
xpos -= 2;
} else {
if(ypos > 0) {
xpos = xlim - 2;
ypos--;
}
}
VRAM[POS + 0] = '\0';
VRAM[POS + 1] = color;
break;
default:
VRAM[POS + 0] = ch;
VRAM[POS + 1] = color;
xpos += 2;
break;
}
if(xpos >= xlim) {
xpos -= xlim;
ypos++;
}
console_scroll();
console_update();
}
void console_down() {
int i, j, o;
if (cur_row == 23) {
/* need to scroll down! */
console_scroll_down();
if (cur_row == 23) /* still no change */
return;
}
/* move forwards: */
o = cursor_off;
for (j = cur_col; j < 80; j++) {
if (screen_copy[cur_row][j])
o++;
}
for (j = 0; j < 80; j++) {
if (j >= seek_col) {
if (!screen_copy[cur_row+1][j])
o--;
break;
}
if (screen_copy[cur_row+1][j]) {
o++;
}
}
cursor_off = o;
console_update();
}
void console_init() {
int i, j = 0;
for (; j < 1; j++) {
for (i = 0; i < cols; i++) {
setCharAtOff(j, i, ' ');
setAttrAtOff(j, i, 0x2E);
}
}
for (; j < rows-1; j++) {
for (i = 0; i < cols; i++) {
setCharAtOff(j, i, ' ');
setAttrAtOff(j, i, 0x1F);
}
}
for (; j < rows; j++) {
for (i = 0; i < cols; i++) {
setCharAtOff(j, i, ' ');
setAttrAtOff(j, i, 0x70);
}
}
disable_echo();
disable_buf();
console_update();
}
void console_up() {
int i, j, o;
if (cur_row == 1) {
/* need to scroll up! */
console_scroll_up();
if (cur_row == 1) /* still no change */
return;
}
/* move backwards: */
o = cursor_off;
for (j = cur_col; j >= 0; j--) {
if (screen_copy[cur_row][j])
o--;
}
for (j = 79; j >= 0; j--) {
if (screen_copy[cur_row-1][j]) {
if (j <= seek_col) {
break;
}
o--;
}
}
cursor_off = o;
console_update();
}
void console_insert(char c) {
/* insert a character: */
file_insert(c, cursor_off);
console_update();
console_right();
}
void console_backspace() {
/* do backspace: */
if (!cursor_off)
return;
file_del(cursor_off-1);
console_update();
console_left();
}
void console_left() {
if (cursor_off == 0)
return;
cursor_off--;
/* need scroll? */
if (cursor_off < file_start) {
console_scroll_up();
} else {
/* just update: */
console_update();
}
seek_col = cur_col;
}
void console_right() {
if (cursor_off == fileSize)
return;
cursor_off++;
if (cursor_off > win_last) {
/* need to scroll. */
console_scroll_down();
} else {
/* just update: */
console_update();
}
seek_col = cur_col;
}
void console_scroll_down() {
int i, j, k = file_start, next_line = 0, f = 0;
if (win_last == fileSize)
return;
for (j = 0; j < 80; j++) {
char c = fileMem[k++];
if (c == '\n')
break;
if (c == '\t') {
j += 8-(j%8)-1;
continue;
}
}
file_start = k;
console_update();
}
void console_scroll_up() {
int i, last_line, count;
int prev_line = file_start;
if (!file_start)
return;
/* get the beginning of previous line: */
while(1) {
prev_line--;
if (!prev_line || fileMem[prev_line-1] == '\n') {
break;
}
}
/* how many columns needed for that line? */
i = prev_line;
last_line = 0;
count = 0;
do {
if (count % 80 == 0)
last_line = i;
if (fileMem[i] == '\t') {
count += 8 - (count%8);
} else {
count++;
}
} while (++i != file_start);
/* now we know from where to start: */
file_start = last_line;
/* update screen: */
console_update();
}