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#include "printf.h"
#include "string.h"
#include "proc/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++
struct print_flags
{
char flg_alt, flg_zeropad, flg_ladjust, flg_showsign, flg_signspace;
int fieldw, precision;
int lenmod, lenspec, radix, unsign;
};
static int
convert_as_int(
char *str,
size_t size,
int stri,
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++;
for(uintmax_t i = value, digiti = 0; digiti < digits; i /= radix) {
char i_mod = (char)(i % radix);
int stri_digiti = stri + (digits - digiti) - 1;
SPRINTF_PUTC(str, size, stri_digiti,
(i_mod > 9 ? (i_mod + 'a' - 10) : (i_mod + '0')));
digiti++;
}
return digits;
}
enum printf_state
{
FSTATE_DIRECT = 0,
FSTATE_FLAG,
FSTATE_FIELDWIDTH,
FSTATE_PRECISION,
FSTATE_LENMOD,
FSTATE_CONVERT
};
static int
s_convert_string(char *str, size_t size, va_list ap, size_t stri, struct print_flags flags)
{
const char *strarg = va_arg(ap, const char*);
if((uintptr_t)strarg < 0xFFFF800000000000ULL) return stri;
int arglen = flags.precision == 0 ? strlen(strarg) : flags.precision;
int minlen = flags.fieldw;
char padc = flags.flg_zeropad ? '0' : ' ';
for(int i = 0; i < minlen - arglen; i++) {
SPRINTF_PUTC(str, size, stri, padc);
}
for(int i = 0; i < arglen; i++) {
SPRINTF_PUTC(str, size, stri, strarg[i]);
}
return stri;
}
static int
s_convert_int(char *str, size_t size, va_list ap, size_t stri,
struct print_flags flags)
{
char num_buf[64];
uintmax_t value = 0;
switch(flags.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;
int advance = convert_as_int(num_buf, 64, 0, value, flags.radix, flags.unsign);
if(flags.flg_alt) {
for(int i = 0; i < advance; i++) {
num_buf[i] = c_toupper(num_buf[i]);
}
}
int pad_diff = flags.fieldw - advance;
char padchar = flags.flg_zeropad ? '0' : ' ';
for(int i = 0; i < pad_diff; i++) {
SPRINTF_PUTC(str, size, stri, padchar);
}
for(int i = 0; i < advance; i++) {
SPRINTF_PUTC(str, size, stri, num_buf[i]);
}
return stri;
}
int
s_convert_path(char *str, size_t size, va_list ap, size_t stri)
{
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, subdir, 10, 1);
stri += advance;
SPRINTF_PUTC(str, size, stri, '/');
}
return stri;
}
int
vsnprintf(
char *str, size_t size,
const char *fmt, va_list ap)
{
int stri = 0;
int state = FSTATE_DIRECT;
struct print_flags flags = { 0 };
flags.lenspec = 4;
for(const char *fmtc = fmt; *fmtc; fmtc++) {
if(state == FSTATE_DIRECT) {
if(*fmtc == '%') {
state++;
continue;
}
SPRINTF_PUTC(str, size, stri, *fmtc);
}else
if(state == FSTATE_FLAG) {
switch(*fmtc) {
case '#': flags.flg_alt = 1; break;
case '0': flags.flg_zeropad = 1; break;
case '-': flags.flg_ladjust = 1; break;
case ' ': flags.flg_signspace = 1; break;
case '+': flags.flg_showsign = 1; break;
default:
state++;
fmtc--;
break;
}
}else
if(state == FSTATE_FIELDWIDTH) {
if(*fmtc > '0' && *fmtc <= '9') {
do {
flags.fieldw *= 10;
flags.fieldw += *fmtc - '0';
fmtc++;
} while(*fmtc >= '0' && *fmtc <= '9');
}
fmtc--;
state++;
}else
if(state == FSTATE_PRECISION) {
if(*fmtc == '.') {
fmtc++;
while(*fmtc >= '0' && *fmtc <= '9') {
flags.precision *= 10;
flags.precision += *fmtc - '0';
fmtc++;
}
}
fmtc--;
state++;
}else
if(state == FSTATE_LENMOD) {
switch(*fmtc) {
case 'l':
flags.lenmod =
flags.lenmod == 'l' ? 'L' : 'l';
break;
default:
fmtc--;
state++;
break;
}
}else
if(state == FSTATE_CONVERT) {
switch(*fmtc) {
case 's':
stri = s_convert_string(str, size, ap, stri, flags);
break;
case 'b':
flags.radix = 2;
stri = s_convert_int(str, size, ap, stri, flags);
break;
case 'o':
flags.radix = 8;
stri = s_convert_int(str, size, ap, stri, flags);
break;
case 'p':
flags.lenspec = sizeof(uintptr_t);
flags.fieldw = flags.lenspec * 2;
flags.flg_zeropad = 1;
flags.flg_alt = 1;
case 'X':
flags.flg_alt = 1;
case 'x':
flags.unsign = 1;
flags.radix = 16;
stri = s_convert_int(str, size, ap, stri, flags);
break;
case 'u':
flags.unsign = 1;
case 'd':
case 'i':
flags.radix = 10;
stri = s_convert_int(str, size, ap, stri, flags);
break;
/*custom formatters for jove.*/
case 'P':
stri = s_convert_path(str, size, ap, stri);
break;
}
flags = (struct print_flags) { 0 };
state = FSTATE_DIRECT;
}
}
if(str && stri < size) str[stri] = 0;
return stri;
}
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