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fix: backspace behavior

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This commit is contained in:
Pierre-Emmanuel Gob. 2026-09-18 20:38:45 +02:00
parent 06d63769ad
commit 5c93703cec
1 changed files with 15 additions and 0 deletions
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15
kernel/arch/x86_64/console.c
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@ -46,6 +46,21 @@ void console_putchar(char c)
if (c == '\n') { if (c == '\n') {
cursor_row++; cursor_row++;
cursor_col = 0; cursor_col = 0;
} else if (c == '\b') {
/* kmain echoes keyboard '\b' for editing. Without this the
* raw 0x08 glyph would print instead of erasing. Move back one
* cell and blank it (IRQ-safe: mainline only, IF=1 but the
* IRQ handlers never touch VGA). */
if (cursor_col > 0) {
cursor_col--;
} else if (cursor_row > 0) {
cursor_row--;
cursor_col = VGA_WIDTH - 1;
} else {
return;
}
vga[cursor_row * VGA_WIDTH + cursor_col] =
(uint16_t)((COLOR_DEFAULT << 8) | ' ');
} else { } else {
vga[cursor_row * VGA_WIDTH + cursor_col] = vga[cursor_row * VGA_WIDTH + cursor_col] =
(uint16_t)((COLOR_DEFAULT << 8) | c); (uint16_t)((COLOR_DEFAULT << 8) | c);