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#include <assert.h>
#include <drivers/serial.h>
#include <stdio.h>
#define TAB_SIZE 8
const char HEX_SET[0x10] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
inline void putc(const char c) {
write_serial(c);
}
int kprint_hex(u64 num) {
int c = 2;
if (num == 0) {
putc('0');
c++;
return c;
}
char str[16] = {0};
int i = 0;
for (; num != 0 && i < 16; i++, num /= 16) {
str[i] = HEX_SET[(num % 16)];
}
c += i;
for (i--; i >= 0; i--) {
putc(str[i]);
}
return c;
}
int kprint_int(int num) {
int c = 0;
if (0 == num) {
putc('0');
c++;
return c;
}
char str[10];
int i = 0;
for (; num != 0 && i < 10; i++, num /= 10) {
str[i] = (num % 10) + '0';
}
c += i;
for (i--; i >= 0; i--) {
putc(str[i]);
}
return c;
}
int vkprintf(const char *format, va_list list) {
int c = 0;
const char *s = format;
for (; *s; s++) {
if ('%' != *s) {
putc(*s);
c++;
continue;
}
char flag = *(s + 1);
if ('\0' == flag) {
break;
}
switch (flag) {
case 'c':
putc((char)va_arg(list, int));
c++;
break;
case 'd':
c += kprint_int(va_arg(list, int));
break;
case 's':
for (char *string = va_arg(list, char *); *string; putc(*string++), c++)
;
break;
case 'x':
c += kprint_hex(va_arg(list, const u32));
break;
case '%':
putc('%');
c++;
break;
default:
ASSERT_NOT_REACHED;
break;
}
s++;
}
return c;
}
int kprintf(const char *format, ...) {
va_list list;
va_start(list, format);
int rc = vkprintf(format, list);
va_end(list);
return rc;
}
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