forked from PoliEcho-holding-org/kern
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
#include "screen.h"
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#include "stdint.h"
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uint16_t cursor = 0;
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void putc(char c, uint8_t attr) {
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if (c == '\n') {
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uint16_t line = cursor - (cursor % COLS);
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setCursorPos(line + COLS);
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return;
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}
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int mem = VIDMEM + cursor * 2;
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*(char*)(mem) = c;
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*(char*)(mem+1) = attr;
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cursor++;
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}
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void print(char* s, uint8_t attr) {
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char c = *s;
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while (c != '\0') {
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putc(c, attr);
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c = *(++s);
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}
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}
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void putcAt(char c, uint8_t attr, uint8_t col, uint8_t row) {
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uint16_t offset = calcOffset(col, row);
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*(char*)(VIDMEM + offset * 2) = c;
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*(char*)(VIDMEM + offset * 2 + 1) = attr;
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}
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void printAt(char* s, uint8_t attr, uint8_t col, uint8_t row) {
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uint16_t offset = calcOffset(col, row);
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char c = *s;
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while (c != '\0') {
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*(char*)(VIDMEM + offset * 2) = c;
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*(char*)(VIDMEM + offset * 2 + 1) = attr;
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c = *(++s);
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offset++;
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}
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}
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void clear(uint8_t attr) {
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for (int i = 0; i < CHARS*2; i += 2) {
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*(char*)(VIDMEM + i) = ' ';
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*(char*)(VIDMEM + i + 1) = attr;
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}
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}
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void setCursorPos(uint16_t offset) {
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cursor = offset;
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}
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uint16_t getCursorPos() {
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return cursor;
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}
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uint16_t calcOffset(uint8_t col, uint8_t row) {
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return row * COLS + col;
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}
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