106 lines
1.9 KiB
C
106 lines
1.9 KiB
C
#include <system.h>
|
|
|
|
#define args_list char *
|
|
#define _arg_stack_size(type) (((sizeof(type)-1)/sizeof(int)+1)*sizeof(int))
|
|
#define args_start(ap, fmt) do { \
|
|
ap = (char *)((unsigned int)&fmt + _arg_stack_size(&fmt));\
|
|
} while (0)
|
|
#define args_end(ap)
|
|
#define args_next(ap, type) (((type *)(ap+=_arg_stack_size(type)))[-1])
|
|
|
|
static char buf[1024] = {-1};
|
|
static int ptr = -1;
|
|
|
|
/*
|
|
* Parse integer
|
|
*/
|
|
static void
|
|
parse_num(
|
|
unsigned int value,
|
|
unsigned int base
|
|
) {
|
|
unsigned int n = value / base;
|
|
int r = value % base;
|
|
if (r < 0) {
|
|
r += base;
|
|
--n;
|
|
}
|
|
if (value >= base) {
|
|
parse_num(n, base);
|
|
}
|
|
buf[ptr++] = (r+'0');
|
|
}
|
|
|
|
/*
|
|
* Parse hexadecimal
|
|
*/
|
|
static void
|
|
parse_hex(
|
|
unsigned int value
|
|
) {
|
|
int i = 8;
|
|
while (i-- > 0) {
|
|
buf[ptr++] = "0123456789abcdef"[(value>>(i*4))&0xF];
|
|
}
|
|
}
|
|
|
|
/*
|
|
* kprintf
|
|
* %s, %c, %x, %d, %%
|
|
* (Kernel) Print a formatted string.
|
|
*/
|
|
void
|
|
kprintf(
|
|
const char *fmt,
|
|
...
|
|
) {
|
|
int i = 0;
|
|
char *s;
|
|
args_list args;
|
|
args_start(args, fmt);
|
|
ptr = 0;
|
|
for ( ; fmt[i]; ++i) {
|
|
if ((fmt[i] != '%') && (fmt[i] != '\\')) {
|
|
buf[ptr++] = fmt[i];
|
|
continue;
|
|
} else if (fmt[i] == '\\') {
|
|
switch (fmt[++i]) {
|
|
case 'a': buf[ptr++] = '\a'; break;
|
|
case 'b': buf[ptr++] = '\b'; break;
|
|
case 't': buf[ptr++] = '\t'; break;
|
|
case 'n': buf[ptr++] = '\n'; break;
|
|
case 'r': buf[ptr++] = '\r'; break;
|
|
case '\\':buf[ptr++] = '\\'; break;
|
|
}
|
|
continue;
|
|
}
|
|
/* fmt[i] == '%' */
|
|
switch (fmt[++i]) {
|
|
case 's':
|
|
s = (char *)args_next(args, char *);
|
|
while (*s) {
|
|
buf[ptr++] = *s++;
|
|
}
|
|
break;
|
|
case 'c':
|
|
buf[ptr++] = (char)args_next(args, int);
|
|
break;
|
|
case 'x':
|
|
parse_hex((unsigned long)args_next(args, unsigned long));
|
|
break;
|
|
case 'd':
|
|
parse_num((unsigned long)args_next(args, unsigned long), 10);
|
|
break;
|
|
case '%':
|
|
buf[ptr++] = '%';
|
|
break;
|
|
default:
|
|
buf[ptr++] = fmt[i];
|
|
break;
|
|
}
|
|
}
|
|
buf[ptr] = '\0';
|
|
args_end(args);
|
|
puts(buf);
|
|
}
|