83 lines
No EOL
1.2 KiB
C
83 lines
No EOL
1.2 KiB
C
#include "include/screen.h"
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#include "../os3_common/datatypes.h"
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#include "../os3_common/packing.h"
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int x = 0;
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int y = 0;
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void write_character(char c) {
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os_u16 color_byte = 0x0A;
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os_u16* vram = (os_u16*) 0xB8000;
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os_u16* cursor_pos = vram + ((y * 80) + x);
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*cursor_pos = c | (color_byte << 8);
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}
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void write_string(const char* str, int max_len) {
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int i = 0;
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do {
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char c = *str;
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if (c == 0) {
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return;
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}
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if (c == '\n') {
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if (y == 24) {
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clear_screen();
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}
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y = (y + 1) % 25;
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x = 0;
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str++;
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continue;
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}
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write_character(c);
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x++;
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if (x >= 80) {
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if (y == 24) {
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clear_screen();
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}
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y = (y + 1) % 25;
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x = 0;
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}
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str++;
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i++;
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} while(i < max_len || max_len == 0);
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}
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void clear_screen() {
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os_u16* ptr = (os_u16*) 0xB8000;
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for (int y = 0; y < 25; y++) {
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for (int x = 0; x < 80; x++) {
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*ptr = 0;
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ptr++;
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}
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}
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x = 0;
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y = 0;
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}
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void write_number(os_u32 number) {
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char buffer[32];
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char buffer_2[32];
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os_s32 i = 1;
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while(i < 32) {
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if (i > 1 && number == 0) {
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break;
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}
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buffer[i] = ((char)(number % 10)) + '0';
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i++;
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number /= 10;
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}
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i--;
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buffer[0] = '\0';
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char* buffer_2_ptr = buffer_2;
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while(i >= 0) {
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*buffer_2_ptr = buffer[i];
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buffer_2_ptr++;
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i--;
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}
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write_string(buffer_2, 0);
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} |