My personal OS project
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brados/kernel/printk.c

76 lines
1.5 KiB

#include <stdarg.h>
#include <stddef.h>
#include <brados/printk.h>
#include <brados/string.h>
#include <video/vga.h>
const char *BASE16 = "0123456789ABCDEF";
static int printNum(struct vgastate *term, unsigned int num, unsigned int base)
{
int numPrinted = 0;
int digit = num % base;
if (num >= base)
numPrinted += printNum(term, num / base, base);
term_putChar(term, BASE16[digit]);
numPrinted++;
return numPrinted;
}
int printk(struct vgastate *term, const char *fmt, ...)
{
int numPrinted = 0;
va_list args;
va_start(args, fmt);
for (size_t i = 0; i < strlen(fmt); i++) {
if (fmt[i] == '%') {
int d;
unsigned int x;
char *s;
switch (fmt[i+1]) {
case '%':
term_putChar(term, '%');
numPrinted++;
break;
case 'c':
term_putChar(term, (char) va_arg(args, int));
numPrinted++;
break;
case 'i':
d = va_arg(args, int);
if (d < 0) {
term_putChar(term, '-');
numPrinted++;
d *= -1;
}
numPrinted += printNum(term, (unsigned int) d, 10);
break;
case 's':
s = va_arg(args, char *);
term_writeStr(term, s);
numPrinted += strlen(s);
break;
case 'x':
x = va_arg(args, unsigned int);
term_writeStr(term, "0x");
numPrinted += 2;
numPrinted += printNum(term, x, 16);
break;
default:
term_putChar(term, fmt[i+1]);
numPrinted++;
break;
}
i++;
} else {
term_putChar(term, fmt[i]);
numPrinted++;
}
}
va_end(args);
return numPrinted;
}