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typedef unsigned long va_list;
#define ACC 4
#define __read(source) \
({ va_list __res; \
__asm__ __volatile__( \
"move\t%0, " #source "\n\t" \
: "=r" (__res)); \
__res; \
})
enum format_type {
FORMAT_TYPE_NONE,
FORMAT_TYPE_HEX,
FORMAT_TYPE_ULONG,
FORMAT_TYPE_FLOAT
};
struct printf_spec {
char type;
};
static int format_decode(char *fmt, struct printf_spec *spec)
{
char *start = fmt;
for (; *fmt ; ++fmt) {
if (*fmt == '%') {
break;
}
}
switch (*++fmt) {
case 'x':
spec->type = FORMAT_TYPE_HEX;
break;
case 'd':
spec->type = FORMAT_TYPE_ULONG;
break;
case 'f':
spec->type = FORMAT_TYPE_FLOAT;
break;
default:
spec->type = FORMAT_TYPE_NONE;
}
return ++fmt - start;
}
void *memcpy(void *dest, void *src, int n)
{
int i;
char *s = src;
char *d = dest;
for (i = 0; i < n; i++) {
d[i] = s[i];
}
return dest;
}
char *number(char *buf, va_list num)
{
int i;
char *str = buf;
static char digits[16] = "0123456789abcdef";
str = str + sizeof(num) * 2;
for (i = 0; i < sizeof(num) * 2; i++) {
*--str = digits[num & 15];
num >>= 4;
}
return buf + sizeof(num) * 2;
}
char *__number(char *buf, va_list num)
{
int i;
va_list mm = num;
char *str = buf;
if (!num) {
*str++ = '0';
return str;
}
for (i = 0; mm; mm = mm/10, i++) {
/* Do nothing. */
}
str = str + i;
while (num) {
*--str = num % 10 + 48;
num = num / 10;
}
return str + i;
}
va_list modf(va_list args, va_list *integer, va_list *num)
{
int i;
double dot_v = 0;
va_list E, DOT, DOT_V;
if (!args) {
return 0;
}
for (i = 0, args = args << 1 >> 1; i < 52; i++) {
if ((args >> i) & 0x1) {
break;
}
}
*integer = 0;
if ((args >> 56 != 0x3f) || (args >> 52 == 0x3ff)) {
E = (args >> 52) - 1023;
DOT = 52 - E - i;
DOT_V = args << (12 + E) >> (12 + E) >> i;
*integer = ((args << 12 >> 12) >> (i + DOT)) | (1 << E);
} else {
E = ~((args >> 52) - 1023) + 1;
DOT_V = args << 12 >> 12;
dot_v += 1.0 / (1 << E);
for (i = 1; i <= 16; i++) {
if ((DOT_V >> (52 - i)) & 0x1) {
dot_v += 1.0 / (1 << E + i);
}
}
for (i = 1, E = 0; i <= ACC; i++) {
dot_v *= 10;
if (!(va_list)dot_v) {
E++;
}
}
*num = E;
return dot_v;
}
if (args & 0xf) {
for (i = 1; i <= 16; i++) {
if ((DOT_V >> (DOT - i)) & 0x1) {
dot_v += 1.0 / (1 << i);
}
}
for (i = 1, E = 0; i <= ACC; i++) {
dot_v *= 10;
if (!(va_list)dot_v) {
E++;
}
}
*num = E;
return dot_v;
} else if (DOT) {
for (i = 1; i <= DOT; i++) {
if ((DOT_V >> (DOT - i)) & 0x1) {
dot_v += 1.0 / (1 << i);
}
}
for (i = 1; i <= ACC; i++) {
dot_v = dot_v * 10;
}
return dot_v;
}
return 0;
}
int vsnprintf(char *buf, int size, char *fmt, va_list args)
{
char *str, *mm;
struct printf_spec spec = {0};
str = mm = buf;
while (*fmt) {
char *old_fmt = fmt;
int read = format_decode(fmt, &spec);
fmt += read;
switch (spec.type) {
case FORMAT_TYPE_NONE: {
memcpy(str, old_fmt, read);
str += read;
break;
}
case FORMAT_TYPE_HEX: {
memcpy(str, old_fmt, read);
str = number(str + read, args);
for (; *mm ; ++mm) {
if (*mm == '%') {
*mm = '0';
break;
}
}
break;
}
case FORMAT_TYPE_ULONG: {
memcpy(str, old_fmt, read - 2);
str = __number(str + read - 2, args);
break;
}
case FORMAT_TYPE_FLOAT: {
va_list integer, dot_v, num;
dot_v = modf(args, &integer, &num);
memcpy(str, old_fmt, read - 2);
str += read - 2;
if ((args >> 63 & 0x1)) {
*str++ = '-';
}
str = __number(str, integer);
if (dot_v) {
*str++ = '.';
while (num--) {
*str++ = '0';
}
str = __number(str, dot_v);
}
break;
}
}
}
*str = '\0';
return str - buf;
}
static void serial_out(char *str)
{
while (*str) {
*(char *)0xffffffffb80003f8 = *str++;
}
}
int vprintf(char *fmt, va_list args)
{
int printed_len = 0;
static char printf_buf[512];
printed_len = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
serial_out(printf_buf);
return printed_len;
}
int printf(char *fmt, ...)
{
return vprintf(fmt, __read($5));
}
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