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