Refactor implementation for terminal using states
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43bab5ff4f
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dea250ee13
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@ -5,8 +5,11 @@
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#include <stddef.h>
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#include <stdint.h>
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static const size_t VGA_WIDTH = 80;
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static const size_t VGA_HEIGHT = 25;
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#define VGA_WIDTH 80
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#define VGA_HEIGHT 25
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#define MAX_ENTRIES (VGA_HEIGHT*VGA_WIDTH)
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#define TERMINAL_BUFFER_START 0xB8000
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#define BLANK_CHAR ' '
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/* Hardware text mode color constants. */
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enum vga_color {
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@ -28,83 +31,127 @@ enum vga_color {
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VGA_COLOR_WHITE = 15,
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};
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size_t terminal_row;
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size_t terminal_column;
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uint8_t terminal_color;
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uint16_t* terminal_buffer;
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typedef struct terminal_entry{
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enum vga_color bg_color;
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enum vga_color fg_color;
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char value;
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} terminal_entry;
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uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) {
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return fg | bg << 4;
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typedef struct terminal_state{
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terminal_entry entries[MAX_ENTRIES];
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int position;
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enum vga_color bg_color, fg_color;
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} terminal_state;
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/* Clear the terminal with only blank spaces */
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void __terminal_clear(terminal_state* state){
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uint16_t* terminal_buffer = (uint16_t*) TERMINAL_BUFFER_START;
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uint16_t empty_color = VGA_COLOR_BLACK | VGA_COLOR_GREEN << 4;
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for(size_t y=0;y<VGA_HEIGHT;++y)
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for(size_t x=0;x<VGA_WIDTH;++x){
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size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = (uint16_t) ((unsigned char)BLANK_CHAR) | (uint16_t) empty_color << 8;
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}
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}
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uint16_t vga_entry(unsigned char uc, uint8_t color) {
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return (uint16_t) uc | (uint16_t) color << 8;
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/* Initialise a state, i.e. put every char on blank and the default color everywhere */
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void terminal_initialize_state(terminal_state* state){
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state->position=0;
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state->bg_color = VGA_COLOR_BLACK;
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state->fg_color = VGA_COLOR_WHITE;
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for(size_t y=0;y<VGA_HEIGHT;++y)
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for(size_t x=0;x<VGA_WIDTH;++x){
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size_t index = y * VGA_WIDTH + x;
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state->entries[index].value = BLANK_CHAR;
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}
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__terminal_clear(state);
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}
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size_t strlen(const char* str) {
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/* Copy the state from one to the other */
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void terminal_state_copy(terminal_state* from, terminal_state* to){
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to->position=from->position;
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to->bg_color = from->bg_color;
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to->fg_color = from->fg_color;
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for(size_t y=0;y<VGA_HEIGHT;++y)
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for(size_t x=0;x<VGA_WIDTH;++x){
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size_t index = y * VGA_WIDTH + x;
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to->entries[index].value = from->entries[index].value;
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}
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}
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/* This function will update the terminal buffer with the given state */
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void terminal_update(terminal_state *state){
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__terminal_clear(state);
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uint16_t* terminal_buffer = (uint16_t*) TERMINAL_BUFFER_START;
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for(size_t y=0;y<VGA_HEIGHT;++y)
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for(size_t x=0;x<VGA_WIDTH;++x){
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size_t index = y * VGA_WIDTH + x;
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terminal_entry entry = state->entries[index];
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uint8_t color = entry.fg_color | entry.bg_color << 4;
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terminal_buffer[index] = (uint16_t) ((unsigned char)entry.value) | (uint16_t) color << 8;
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}
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}
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/* Update the background color */
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void __terminal_set_bg_color(terminal_state* state, enum vga_color color){
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state->bg_color = color;
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}
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/* Update the foreground color */
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void __terminal_set_fg_color(terminal_state* state, enum vga_color color){
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state->fg_color = color;
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}
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/* Update the color */
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void terminal_set_color(terminal_state* state, enum vga_color bg_color, enum vga_color fg_color){
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__terminal_set_bg_color(state, bg_color);
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__terminal_set_fg_color(state, fg_color);
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}
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/* Write a char to the state */
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void __terminal_put_char(terminal_state *state, char c){
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size_t pos = state->position;
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terminal_entry entry;
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/* If there is a new line, keep going until the end of the line (with blank space in black) */
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if(c == '\n'){
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entry.bg_color = VGA_COLOR_BLACK;
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entry.fg_color = VGA_COLOR_BLACK;
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entry.value = BLANK_CHAR;
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while(pos % VGA_WIDTH){
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state->entries[pos] = entry;
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++pos;
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}
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state->position = (pos % MAX_ENTRIES);
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}
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else{
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entry.bg_color = state->bg_color;
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entry.fg_color = state->fg_color;
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entry.value = c;
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state->entries[pos] = entry;
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state->position = ((pos+1) % MAX_ENTRIES);
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}
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}
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/* Write a char to the state and run an update */
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void terminal_write_char(terminal_state *state, const char c){
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__terminal_put_char(state, c);
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terminal_update(state);
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}
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/* Write a string to the state and run an update */
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void terminal_write_str(terminal_state *state, const char* str){
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size_t len = 0;
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while (str[len])
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len++;
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return len;
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while (str[len]) {
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__terminal_put_char(state, str[len]);
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++len;
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}
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terminal_update(state);
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}
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void terminal_initialize(void) {
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terminal_row = 0;
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terminal_column = 0;
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terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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terminal_buffer = (uint16_t*) 0xB8000;
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for (size_t y = 0; y < VGA_HEIGHT; y++) {
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(' ', terminal_color);
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}
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}
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}
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void terminal_setcolor(uint8_t color) {
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terminal_color = color;
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}
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void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(c, color);
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}
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void terminal_putchar(char c) {
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if (c == '\n') {
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terminal_column = 0;
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terminal_row++;
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return;
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}
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if (c == 0x08) {
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terminal_putentryat(' ', terminal_color, terminal_column, terminal_row);
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if (terminal_column == 0) {
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if(terminal_row != 0) {
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terminal_row--;
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terminal_column = VGA_WIDTH - 1;
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}
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} else {
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terminal_column--;
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}
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terminal_putentryat(' ', terminal_color, terminal_column, terminal_row);
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return;
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}
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terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
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if (++terminal_column == VGA_WIDTH) {
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terminal_column = 0;
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if (++terminal_row == VGA_HEIGHT)
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terminal_row = 0;
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}
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}
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void terminal_write(const char* data, size_t size) {
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for (size_t i = 0; i < size; i++)
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terminal_putchar(data[i]);
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}
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void terminal_writestring(const char* data) {
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terminal_write(data, strlen(data));
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/* Clear the terminal en reset the state to the initial state */
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void terminal_clear_state(terminal_state* state){
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__terminal_clear(state);
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terminal_initialize_state(state);
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}
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char* itoa(unsigned int value, char* result, int base) {
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@ -129,10 +176,10 @@ char* itoa(unsigned int value, char* result, int base) {
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return result;
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}
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void terminal_writeint(int number, int base) {
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void terminal_write_int(terminal_state* state,int number, int base) {
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char* result = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
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itoa(number, result, base);
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terminal_writestring(result);
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terminal_write_str(state, result);
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}
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#endif //TERMINAL_C
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#endif //TERMINAL_C
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