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#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include "pcr.h"
void exit(int code)
{
volatile uint64_t magic_mem[8] = {0};
magic_mem[0] = 93;
magic_mem[1] = code;
__sync_synchronize();
mtpcr(PCR_TOHOST, (long)magic_mem);
while(1);
}
void printstr(const char* s)
{
volatile uint64_t magic_mem[8] = {0};
magic_mem[0] = 64;
magic_mem[1] = 1;
magic_mem[2] = (unsigned long)s;
magic_mem[3] = strlen(s);
__sync_synchronize();
mtpcr(PCR_TOHOST, (long)magic_mem);
while(mtpcr(PCR_FROMHOST, 0) == 0);
}
int putchar(int ch)
{
#define buffered_putch_bufsize 64
static __thread char buf[buffered_putch_bufsize];
static __thread int buflen = 0;
if(ch != -1)
buf[buflen++] = ch;
if(ch == -1 || buflen == buffered_putch_bufsize)
{
volatile uint64_t magic_mem[8] = {0};
magic_mem[0] = 64;
magic_mem[1] = 1;
magic_mem[2] = (long)buf;
magic_mem[3] = buflen;
__sync_synchronize();
mtpcr(PCR_TOHOST, (long)magic_mem);
while(mtpcr(PCR_FROMHOST, 0) == 0);
buflen = 0;
}
return 0;
}
void printhex(uint64_t x)
{
char str[17];
int i;
for (i = 0; i < 16; i++)
{
str[15-i] = (x & 0xF) + ((x & 0xF) < 10 ? '0' : 'a'-10);
x >>= 4;
}
str[16] = 0;
printstr(str);
}
static void printnum(void (*putch)(int, void**), void **putdat,
unsigned long long num, unsigned base, int width, int padc)
{
if (num >= base)
printnum(putch, putdat, num / base, base, width - 1, padc);
else while (--width > 0)
putch(padc, putdat);
putch("0123456789abcdef"[num % base], putdat);
}
static unsigned long long getuint(va_list *ap, int lflag)
{
if (lflag >= 2)
return va_arg(*ap, unsigned long long);
else if (lflag)
return va_arg(*ap, unsigned long);
else
return va_arg(*ap, unsigned int);
}
static long long getint(va_list *ap, int lflag)
{
if (lflag >= 2)
return va_arg(*ap, long long);
else if (lflag)
return va_arg(*ap, long);
else
return va_arg(*ap, int);
}
void vprintfmt(void (*putch)(int, void**), void **putdat, const char *fmt, va_list ap)
{
register const char* p;
const char* last_fmt;
register int ch, err;
unsigned long long num;
int base, lflag, width, precision, altflag;
char padc;
while (1) {
while ((ch = *(unsigned char *) fmt) != '%') {
if (ch == '\0')
return;
fmt++;
putch(ch, putdat);
}
fmt++;
// Process a %-escape sequence
last_fmt = fmt;
padc = ' ';
width = -1;
precision = -1;
lflag = 0;
altflag = 0;
reswitch:
switch (ch = *(unsigned char *) fmt++) {
// flag to pad on the right
case '-':
padc = '-';
goto reswitch;
// flag to pad with 0's instead of spaces
case '0':
padc = '0';
goto reswitch;
// width field
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
for (precision = 0; ; ++fmt) {
precision = precision * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
goto process_precision;
case '*':
precision = va_arg(ap, int);
goto process_precision;
case '.':
if (width < 0)
width = 0;
goto reswitch;
case '#':
altflag = 1;
goto reswitch;
process_precision:
if (width < 0)
width = precision, precision = -1;
goto reswitch;
// long flag (doubled for long long)
case 'l':
lflag++;
goto reswitch;
// character
case 'c':
putch(va_arg(ap, int), putdat);
break;
// string
case 's':
if ((p = va_arg(ap, char *)) == NULL)
p = "(null)";
if (width > 0 && padc != '-')
for (width -= strnlen(p, precision); width > 0; width--)
putch(padc, putdat);
for (; (ch = *p) != '\0' && (precision < 0 || --precision >= 0); width--) {
if (altflag && (ch < ' ' || ch > '~'))
putch('?', putdat);
else
putch(ch, putdat);
p++;
}
for (; width > 0; width--)
putch(' ', putdat);
break;
// (signed) decimal
case 'd':
num = getint(&ap, lflag);
if ((long long) num < 0) {
putch('-', putdat);
num = -(long long) num;
}
base = 10;
goto number;
// unsigned decimal
case 'u':
num = getuint(&ap, lflag);
base = 10;
goto number;
// (unsigned) octal
case 'o':
// should do something with padding so it's always 3 octits
num = getuint(&ap, lflag);
base = 8;
goto number;
// pointer
case 'p':
putch('0', putdat);
putch('x', putdat);
num = (unsigned long long)
(uintptr_t) va_arg(ap, void *);
base = 16;
goto number;
// (unsigned) hexadecimal
case 'x':
num = getuint(&ap, lflag);
base = 16;
number:
printnum(putch, putdat, num, base, width, padc);
break;
// escaped '%' character
case '%':
putch(ch, putdat);
break;
// unrecognized escape sequence - just print it literally
default:
putch('%', putdat);
fmt = last_fmt;
break;
}
}
}
int printf(const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vprintfmt((void*)putchar, 0, fmt, ap);
putchar(-1);
va_end(ap);
return 0; // incorrect return value, but who cares, anyway?
}
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