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/* A reduced version of the printf function.
Copyright (C) 2011 Richard Henderson
This file is part of QEMU PALcode.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the text
of the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include "console.h"
static int print_buf_pad(char *buf, int buflen, char *p, int width, int pad)
{
int len = buf + buflen - p;
int r = 0;
if (width > len)
{
*--p = pad;
len++;
while (width > buflen)
{
crb_puts(0, p, 1);
width--;
r++;
}
while (width > len)
*--p = pad, len++;
}
crb_puts(0, p, len);
return r + len;
}
static int print_decimal(unsigned long val, int width, int pad)
{
char buf[32];
char *p = buf + sizeof(buf);
if (val == 0)
*--p = '0';
else
{
do
{
unsigned long d, r;
/* Compiling with -Os results in a call to the division routine.
Do what the compiler ought to have done. */
d = __builtin_alpha_umulh(val, 0xcccccccccccccccd);
d >>= 3;
r = val - (d * 10);
*--p = r + '0';
val = d;
}
while (val);
}
return print_buf_pad(buf, sizeof(buf), p, width, pad);
}
static int print_hex(unsigned long val, int width, char pad)
{
char buf[32];
char *p = buf + sizeof(buf);
if (val == 0)
*--p = '0';
else
{
do
{
int d = val % 16;
*--p = (d < 10 ? '0' : 'a' - 10) + d;
val /= 16;
}
while (val);
}
return print_buf_pad(buf, sizeof(buf), p, width, pad);
}
int printf(const char *fmt, ...)
{
va_list args;
unsigned long val;
int r = 0;
va_start(args, fmt);
for (; *fmt ; fmt++)
if (*fmt != '%')
{
crb_puts(0, fmt, 1);
r++;
}
else
{
const char *percent = fmt;
bool is_long = false;
char pad = ' ';
int width = 0;
restart:
switch (*++fmt)
{
case '%':
crb_puts(0, "%", 1);
r++;
break;
case 'l':
is_long = true;
goto restart;
case 'd':
if (is_long)
{
long d = va_arg (args, long);
if (d < 0)
{
crb_puts(0, "-", 1);
d = -d;
}
val = d;
}
else
{
int d = va_arg (args, int);
if (d < 0)
{
crb_puts(0, "-", 1);
d = -d;
r++;
}
val = d;
}
goto do_unsigned;
case 'u':
if (is_long)
val = va_arg (args, unsigned long);
else
val = va_arg (args, unsigned int);
do_unsigned:
r += print_decimal (val, width, pad);
break;
case 'x':
if (is_long)
val = va_arg (args, unsigned long);
else
val = va_arg (args, unsigned int);
r += print_hex (val, width, pad);
break;
case 's':
{
const char *s = va_arg (args, const char *);
int len = strlen(s);
crb_puts(0, s, len);
r += len;
}
break;
case '0':
pad = '0';
case '1' ... '9':
width = *fmt - '0';
while (fmt[1] >= '0' && fmt[1] <= '9')
width = width * 10 + *++fmt - '0';
goto restart;
default:
{
int len = fmt - percent;
crb_puts(0, percent, len);
r += len;
}
break;
}
}
va_end(args);
return r;
}
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