103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
#include "../includes/screen.h"
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#include "../build_numbers.c"
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unsigned char row = 1;
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unsigned char column = 0;
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unsigned char screen_width = 80;
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void print_banner(){
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unsigned short *buffer = 0x000B8000;
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unsigned short attr = 0x1800;
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unsigned char* banner = "Project Code Name: kernel3";
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char* version = KERNEL_VERSION_NUMBER;
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unsigned char banner_length = (80 - strlen(banner)) / 2;
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// Add 14 for the string "Kernel Version: ".
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unsigned char version_length = (80 - (strlen(version) + 16)) / 2;
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for(unsigned char i = 0; i < screen_width; i++){
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*buffer++ = ' ';
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*buffer++ = attr;
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}
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for(unsigned char i = 0; i < screen_width; i++){
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if(i == banner_length){
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for(unsigned short j = 0; j < strlen(banner); j++){
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unsigned short *where = (unsigned short*) 0x000B8000 + j + i;
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*where = banner[j] | attr;
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}
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}
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if(i == version_length){
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unsigned short offset = 0;
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char* tmp = "Kernel Version: ";
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for(unsigned char j = 0; j < strlen(tmp); j++){
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unsigned short *where = (unsigned short*) 0x000B8000 + j + 80 + i;
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*where = tmp[j] | attr;
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offset++;
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}
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for(unsigned char j = 0; j < strlen(version); j++){
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unsigned short *where = (unsigned short*) 0x000B8000 + j + 80 + offset + i;
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*where = version[j] | attr;
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}
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}
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}
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}
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//index = (y_value * width_of_screen) + x_value;
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void draw_rect(int start_x, int start_y, int end_x, int end_y, unsigned char fg, unsigned char bg){
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unsigned char y = end_y - start_y;
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unsigned char x = end_x - start_x;
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int attr = ((bg << 4) | (fg & 0x0F));
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unsigned short *buffer = (unsigned short*) 0x000B8000 + (start_y * 80) + start_x;
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for(unsigned char i = 0; i < y; i++){
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for(unsigned char j = 0; j < x; j++){
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unsigned short *where = (unsigned short*) buffer + (i * 80) + j;
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*where = 0x23 | (attr << 8);
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}
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}
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}
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void draw_s(char* string, unsigned char fg, unsigned char bg)
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{
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char *video_buffer = 0x000B8000;
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for(int i = 0; i < strlen(string); i++)
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{
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char current_char = string[i];
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if(current_char == '\n'){
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//row++;
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column = row * column;
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row++;
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continue;
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}
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video_buffer[i*2 + (row * column)] = string[i];
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video_buffer[i * 2 + 1 + (row * column)] = ((fg & 0x0f) << 4) | (bg & 0x0F);
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//column++;
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}
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}
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void clear_screen(){
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char *video_buffer = 0x000B8000;
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for(unsigned char i = 0; i < 25; i++){
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for(unsigned char j = 0; j < 80; j++){
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*video_buffer++ = ' ';//0x20 | (0x0F << 8);
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*video_buffer++ = 0x82;
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}
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}
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}
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int strlen(char* string)
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{
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int len = 0;
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for(int i = 0; string[i] != '\0'; i++) len++;
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return len;
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}
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