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/*
This file is part of ct.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with ct. If not, see <https://www.gnu.org/licenses/>.
*/
#include "lcdlib.h"
static char previous_lines[LCD_HEIGHT][LCD_WIDTH+1];
static const char* esc = "\x1B[L";
static FILE *lcd = NULL;
static int line_idx;
int
lcd_begin(void) {
lcd = fopen("/dev/lcd", "w");
if (lcd == NULL) return EXIT_FAILURE;
lcd_clear();
return EXIT_SUCCESS;
}
void
lcd_end(void) {
fclose(lcd);
}
void
lcd_set_blink(void) {
fprintf(lcd, "%sB", esc);
fflush(lcd);
}
void
lcd_stop_blink(void) {
fprintf(lcd, "%sb", esc);
fflush(lcd);
}
void
lcd_clear(void) {
line_idx = 0;
for (int y = 0; y + 1 < LCD_HEIGHT; y++) {
fprintf(lcd, "%sy%dx0;%sk", esc, y, esc);
previous_lines[y][0] = 0;
}
fflush(lcd);
}
void
lcd_put_line(const enum LCD_WRITE_MODE mode, const char *line) {
char last_line = 0;
if (line_idx == LCD_HEIGHT) {
if (mode == L_SCROLL) {
// If we're at the bottom, ``shift'' everything up
for (int y = 1; y < LCD_HEIGHT; y++) {
// Go to the start of row y, clear the line, and print the
// previous string there
fprintf(lcd, "%sy%dx0;%sk%s", esc, y-1, esc, previous_lines[y]);
// Overwrite the stored previous line with the next
strncpy(previous_lines[y-1], previous_lines[y], LCD_WIDTH+1);
}
}
last_line = 1;
}
// Go to the correct line, clear it, and write the input.
fprintf(lcd, "%sy%dx0;%sk%s", esc, line_idx, esc, line);
fflush(lcd);
// Store this line, null-terminate!
if (last_line) line_idx--;
strncpy(previous_lines[line_idx], line, LCD_WIDTH+1);
previous_lines[line_idx][LCD_WIDTH] = 0;
if (mode == L_SCROLL && line_idx < LCD_HEIGHT) line_idx++;
}
void
lcd_printf_line(const enum LCD_WRITE_MODE mode,
const char *format, ...) {
char buf[LCD_WIDTH+1];
va_list(args);
va_start(args, format);
vsnprintf(buf, LCD_WIDTH+1, format, args);
va_end(args);
lcd_put_line(mode, buf);
}
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