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#include "printf.h"
#include "string.h"
#include "init.h"
#include "hal/obj.h"
#include <stdint.h>
int kprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
int r = kvprintf(fmt, ap);
va_end(ap);
return r;
}
#define SPRINTF_PUTC(str, size, i, c) \
if(str && i < size) str[i] = (c); \
i++
static int
convert_as_int(
char *str,
size_t size,
int stri,
int field_width,
uintmax_t value,
int radix,
int unsign)
{
unsigned digits = 0;
int ostri = stri;
if((intmax_t)value < 0 && !unsign) {
SPRINTF_PUTC(str, size, stri, '-');
value = 0 - (intmax_t)value;
}
for(uintmax_t i = value; i != 0; i /= radix) digits++;
if(value == 0) digits++;
if(field_width < digits) field_width = digits;
for(uintmax_t i = value, digiti = 0; digiti < digits; i /= radix) {
char i_mod = (char)(i % radix);
int stri_digiti = stri + (field_width - digiti) - 1;
SPRINTF_PUTC(str, size, stri_digiti,
(i_mod > 9 ? (i_mod + 'a' - 10) : (i_mod + '0')));
digiti++;
}
return field_width + (stri - ostri) + 1;
}
int
vsnprintf(
char *str, size_t size,
const char *fmt, va_list ap)
{
int stri = 0;
for(const char *fmtc = fmt; *fmtc; fmtc++) {
if(*fmtc != '%') {
SPRINTF_PUTC(str, size, stri, *fmtc);
continue;
}
fmtc++;
//TODO: other format specifiers.
int field_width = 0;
char field_pad = ' ';
int lenspec = 4;
int radix = 10;
int unsign = 0;
int caps = 0;
switch(*fmtc) {
case 's':
goto string_conversion;
case 'b':
radix = 2;
goto int_conversion;
break;
case 'o':
radix = 8;
goto int_conversion;
break;
case 'p':
lenspec = sizeof(uintptr_t);
field_width = lenspec * 2;
field_pad = '0';
case 'X':
caps = 1;
case 'x':
unsign = 1;
radix = 16;
goto int_conversion;
break;
case 'u':
unsign = 1;
case 'd':
case 'i':
goto int_conversion;
break;
/*custom formatters for jove.*/
case 'P':
goto path_conversion;
break;
}
string_conversion:
{
const char *strarg = va_arg(ap, const char*);
for(const char *strargc = strarg; *strargc; strargc++) {
SPRINTF_PUTC(str, size, stri, *strargc);
}
} continue;
int_conversion:
{
uintmax_t value = 0;
switch(lenspec) {
case 1: value = (uintmax_t)(int8_t)va_arg(ap, int); break;
case 2: value = (uintmax_t)(int16_t)va_arg(ap, int); break;
default:
case 4: value = (uintmax_t)va_arg(ap, unsigned int); break;
case 8: value = (uintmax_t)va_arg(ap, uintmax_t); break;
}
size_t pad_stri = stri;
for(size_t i = 0; i < field_width; i++) {
SPRINTF_PUTC(str, size, pad_stri, field_pad);
}
int advance = convert_as_int(str, size, stri, field_width, value, radix, unsign);
if(caps && str) {
for(int i = 0; i < advance; i++) {
int stra = stri + i;
if(stra < size) str[stra] = c_toupper(str[stra]);
}
}
stri += advance;
} continue;
path_conversion:
{
uint16_t *obj_path = va_arg(ap, uint16_t*);
size_t obj_pathlen = va_arg(ap, size_t);
for(size_t i = 0; i < obj_pathlen; i++) {
uint16_t subdir = obj_path[i];
int advance = convert_as_int(str, size, stri, 3, subdir, 10, 1);
stri += advance;
SPRINTF_PUTC(str, size, stri, '/');
}
} continue;
}
if(str && stri < size) str[stri] = 0;
return stri;
}
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