107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/*
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* AsterOS Kernel
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* Autor: Pavel Kalaš
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* Rok: 2026
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*
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*/
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/*
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* Tento modul implementuje tiskovou vrstvu kernelu nad VGA vystupem.
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* Obsahuje podporu zakladnich formatovacich specifikatoru pro ladeni
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* a jednotne API, ktere pouzivaji ostatni casti jadra pri logovani.
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*/
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#include <stdarg.h>
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#include "display.h"
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#include "printk.h"
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static void print_u64(unsigned long long value, unsigned int base) {
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char buf[32];
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const char *digits = "0123456789abcdef";
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int i = 0;
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if (value == 0) {
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display_putc('0');
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return;
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}
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while (value > 0 && i < (int)sizeof(buf)) {
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buf[i++] = digits[value % base];
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value /= base;
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}
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while (i > 0) {
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display_putc(buf[--i]);
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}
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}
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void aster_print(const char *text) {
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display_write(text);
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}
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void printk(const char *fmt, ...) {
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va_list args;
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va_start(args, fmt);
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while (*fmt) {
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if (*fmt != '%') {
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display_putc(*fmt++);
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continue;
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}
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++fmt;
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switch (*fmt) {
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case '%':
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display_putc('%');
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break;
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case 'c': {
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int c = va_arg(args, int);
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display_putc((char)c);
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break;
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}
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case 's': {
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const char *s = va_arg(args, const char *);
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if (!s) {
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s = "(null)";
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}
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display_write(s);
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break;
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}
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case 'd': {
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long v = va_arg(args, int);
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if (v < 0) {
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display_putc('-');
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print_u64((unsigned long long)(-v), 10);
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} else {
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print_u64((unsigned long long)v, 10);
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}
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break;
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}
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case 'u': {
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unsigned int v = va_arg(args, unsigned int);
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print_u64(v, 10);
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break;
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}
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case 'x': {
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unsigned int v = va_arg(args, unsigned int);
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print_u64(v, 16);
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break;
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}
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case 'p': {
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unsigned long long v = (unsigned long long)va_arg(args, void *);
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display_write("0x");
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print_u64(v, 16);
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break;
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}
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default:
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display_putc('?');
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break;
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}
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++fmt;
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}
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va_end(args);
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}
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