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#include <user/app/init/driver/driver.h>
#include <shared/syscalls.h>
#include <stdbool.h>
struct vga_cell {
unsigned char c;
unsigned char style;
} __attribute__((__packed__));
static struct vga_cell vga[80 * 25];
static handle_t vga_fd;
static struct {int x, y;} cursor = {0};
static bool dirty = false;
static bool pendingFlush = false;
static void flush(void) {
size_t off = 0;
/* we have to do multiple write() calls if we're behind a shitty passthrough fs
* i don't like this either */
while (off < sizeof(vga))
off += _syscall_write(vga_fd, (void*)vga + off, sizeof(vga) - off, off);
dirty = false;
pendingFlush = false;
}
static void scroll(void) {
for (size_t i = 0; i < 80 * 24; i++)
vga[i] = vga[i + 80];
for (size_t i = 80 * 24; i < 80 * 25; i++)
vga[i].c = ' ';
cursor.y--;
pendingFlush = true;
}
static void in_char(char c) {
switch (c) {
case '\n':
cursor.x = 0;
cursor.y++;
pendingFlush = true;
break;
case '\b':
if (--cursor.x < 0) cursor.x = 0;
break;
default:
vga[cursor.y * 80 + cursor.x++].c = c;
}
if (cursor.x >= 80) {
cursor.x = 0;
cursor.y++;
}
while (cursor.y >= 25) scroll();
dirty = true;
}
void ansiterm_drv(void) {
vga_fd = _syscall_open("/kdev/vga", 9, 0);
_syscall_read(vga_fd, vga, sizeof vga, 0);
// find first empty line
for (cursor.y = 0; cursor.y < 25; cursor.y++) {
for (cursor.x = 0; cursor.x < 80; cursor.x++) {
char c = vga[cursor.y * 80 + cursor.x].c;
if (c != ' ' && c != '\0') break;
}
if (cursor.x == 80) break;
}
cursor.x = 0;
for (int i = 0; i < 80 * 25; i++)
vga[i].style = 0x70;
flush();
static char buf[512];
struct fs_wait_response res;
while (!_syscall_fs_wait(buf, sizeof buf, &res)) {
switch (res.op) {
case VFSOP_OPEN:
// TODO check path
_syscall_fs_respond(NULL, 0, 0);
break;
case VFSOP_WRITE:
for (size_t i = 0; i < res.len; i++)
in_char(buf[i]);
/* if (pendingFlush) */ flush();
_syscall_fs_respond(NULL, res.len, 0);
break;
default:
_syscall_fs_respond(NULL, -1, 0);
break;
}
}
_syscall_exit(1);
}
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