thank u gemini this is good too
This commit is contained in:
117
BUGS/kernel.c
117
BUGS/kernel.c
@@ -10,7 +10,8 @@ uint16_t* vga_buffer = (uint16_t*) 0xB8000;
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// System State
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size_t terminal_row = 0;
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size_t terminal_col = 0;
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uint8_t terminal_color = 7; // Light grey on black
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uint8_t terminal_color = 7;
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int is_shift_pressed = 0;
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// --- Low Level I/O ---
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@@ -24,30 +25,34 @@ static inline uint8_t inb(uint16_t port) {
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return ret;
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}
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// --- Hardware Cursor Logic ---
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void update_cursor(int x, int y) {
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uint16_t pos = y * VGA_WIDTH + x;
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outb(0x3D4, 0x0F);
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outb(0x3D5, (uint8_t) (pos & 0xFF));
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outb(0x3D4, 0x0E);
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outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
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}
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// --- String & Memory Utilities ---
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// --- Memory & Scrolling ---
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int strlen(const char* str) {
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int len = 0;
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while (str[len]) len++;
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return len;
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void scroll() {
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// Move every row up by one
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for (size_t y = 0; y < VGA_HEIGHT - 1; y++) {
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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vga_buffer[y * VGA_WIDTH + x] = vga_buffer[(y + 1) * VGA_WIDTH + x];
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}
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}
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// Clear the last row
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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vga_buffer[(VGA_HEIGHT - 1) * VGA_WIDTH + x] = (uint16_t)' ' | (uint16_t)terminal_color << 8;
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}
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terminal_row = VGA_HEIGHT - 1;
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}
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// --- String Utilities ---
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int strcmp(const char* s1, const char* s2) {
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while (*s1 && (*s1 == *s2)) {
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s1++;
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s2++;
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}
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while (*s1 && (*s1 == *s2)) { s1++; s2++; }
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return *(unsigned char*)s1 - *(unsigned char*)s2;
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}
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@@ -63,11 +68,7 @@ char* itoa(int value, char* str, int base) {
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v /= base;
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} while (v);
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*ptr-- = '\0';
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while (low < ptr) {
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char tmp = *low;
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*low++ = *ptr;
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*ptr-- = tmp;
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}
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while (low < ptr) { char tmp = *low; *low++ = *ptr; *ptr-- = tmp; }
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return rc;
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}
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@@ -77,13 +78,8 @@ void putchar(char c) {
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if (c == '\n') {
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terminal_col = 0;
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terminal_row++;
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} else if (c == '\b') {
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// Backspace logic is handled in scanf,
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// but putchar supports it for generic use
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if (terminal_col > 0) terminal_col--;
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} else {
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const size_t index = terminal_row * VGA_WIDTH + terminal_col;
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vga_buffer[index] = (uint16_t) c | (uint16_t) terminal_color << 8;
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vga_buffer[terminal_row * VGA_WIDTH + terminal_col] = (uint16_t) c | (uint16_t) terminal_color << 8;
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if (++terminal_col == VGA_WIDTH) {
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terminal_col = 0;
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terminal_row++;
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@@ -91,8 +87,7 @@ void putchar(char c) {
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}
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if (terminal_row >= VGA_HEIGHT) {
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// Simple scroll: just reset to top for now
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terminal_row = 0;
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scroll();
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}
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update_cursor(terminal_col, terminal_row);
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}
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@@ -107,11 +102,8 @@ void printf(const char* format, ...) {
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char* s = va_arg(args, char*);
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while (*s) putchar(*s++);
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} else if (format[i] == 'd') {
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char buf[32];
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itoa(va_arg(args, int), buf, 10);
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char buf[32]; itoa(va_arg(args, int), buf, 10);
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for (int j = 0; buf[j]; j++) putchar(buf[j]);
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} else if (format[i] == 'c') {
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putchar((char)va_arg(args, int));
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}
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} else {
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putchar(format[i]);
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@@ -120,22 +112,30 @@ void printf(const char* format, ...) {
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va_end(args);
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}
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// --- Keyboard Input ---
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// --- Keyboard Logic ---
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char getchar() {
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static unsigned char map[128] = {
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static unsigned char normal_map[128] = {
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0, 27, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '\b',
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'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
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0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0, '\\',
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'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0, '*', 0, ' '
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};
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static unsigned char shift_map[128] = {
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0, 27, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', '\b',
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'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
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0, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '\"', '~', 0, '|',
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'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 0, '*', 0, ' '
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};
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while (1) {
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if (inb(0x64) & 0x01) {
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uint8_t scancode = inb(0x60);
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// Ignore key-release events (scancode + 128) and non-mapped keys (Alt/Shift)
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if (scancode < 128 && map[scancode] != 0) {
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return map[scancode];
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if (scancode == 0x2A || scancode == 0x36) is_shift_pressed = 1;
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else if (scancode == 0xAA || scancode == 0xB6) is_shift_pressed = 0;
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else if (scancode < 128) {
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unsigned char c = is_shift_pressed ? shift_map[scancode] : normal_map[scancode];
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if (c != 0) return c;
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}
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}
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}
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@@ -149,54 +149,43 @@ void scanf(char* buffer) {
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buffer[i] = '\0';
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putchar('\n');
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break;
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} else if (c == '\b') {
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if (i > 0) {
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i--;
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if (terminal_col > 0) {
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terminal_col--;
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} else if (terminal_row > 0) {
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terminal_row--;
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terminal_col = VGA_WIDTH - 1;
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}
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// Clear the character visually
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vga_buffer[terminal_row * VGA_WIDTH + terminal_col] = (uint16_t)' ' | (uint16_t)terminal_color << 8;
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update_cursor(terminal_col, terminal_row);
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}
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} else {
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} else if (c == '\b' && i > 0) {
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i--;
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if (terminal_col > 0) terminal_col--;
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vga_buffer[terminal_row * VGA_WIDTH + terminal_col] = (uint16_t)' ' | (uint16_t)terminal_color << 8;
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update_cursor(terminal_col, terminal_row);
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} else if (c != '\b') {
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buffer[i++] = c;
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putchar(c);
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}
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}
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}
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// --- Kernel Entry ---
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// --- Main Loop ---
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void kernel_main(void) {
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// Clear Screen
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for (size_t i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) {
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vga_buffer[i] = (uint16_t)' ' | (uint16_t)7 << 8;
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}
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for (size_t i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) vga_buffer[i] = (uint16_t)' ' | (uint16_t)7 << 8;
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update_cursor(0, 0);
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printf("BUGS (Buggy Unverified Greatish Script) v1.1\n");
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printf("Hardware Cursor: ENABLED\n");
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printf("Filtering Alt/Tab symbols: ENABLED\n\n");
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printf("BUGS v1.2 (Scroll & Shift Enabled)\n");
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while (1) {
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printf("BUGS> ");
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char input[64];
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scanf(input);
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if (strcmp(input, "help") == 0) {
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printf("Available commands: help, clear, hello\n");
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} else if (strcmp(input, "clear") == 0) {
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if (strcmp(input, "clear") == 0) {
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for (size_t i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) vga_buffer[i] = (uint16_t)' ' | (uint16_t)7 << 8;
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terminal_row = 0; terminal_col = 0;
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update_cursor(0,0);
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} else if (strcmp(input, "hello") == 0) {
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printf("Greetings from the kernel!\n");
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} else if (strlen(input) > 0) {
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printf("Unknown command: %s\n", input);
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} else if (strcmp(input, "help") == 0) {
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printf("Commands: help, clear, color, test\n");
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} else if (strcmp(input, "color") == 0) {
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terminal_color = (terminal_color + 1) % 15;
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if (terminal_color == 0) terminal_color = 1;
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printf("Text color changed!\n");
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} else if (strcmp(input, "test") == 0) {
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printf("Symbols: !@#$%^&*()_+\n");
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}
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}
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}
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