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/* output.c - Output routines.
Copyright (C) 2003 Free Software Foundation, Inc.
Written by Marcus Brinkmann.
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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 GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdarg.h>
#include "output.h"
/* True if debugging is enabled. */
int output_debug;
/* The active output driver. */
static struct output_driver *output;
/* Activate the output driver NAME or the default one if NAME is a
null pointer. Must be called once at startup, before calling
putchar or any other output routine. Returns 0 if NAME is not a
valid output driver name, otherwise 1 on success. */
int
output_init (char *name)
{
if (output)
{
output_deinit ();
output = 0;
}
if (name)
{
struct output_driver **out = &output_drivers[0];
while (*out)
{
if (!strcmp (name, (*out)->name))
{
output = *out;
break;
}
out++;
}
if (!output)
return 0;
}
else
output = output_drivers[0];
if (output->init)
(*output->init) ();
return 1;
}
/* Deactivate the output driver. Must be called after the last time
putchar or any other output routine is called, and before control
is passed on to the L4 kernel. */
void
output_deinit (void)
{
if (output && output->deinit)
(*output->deinit) ();
}
/* Print the single character CHR on the output device. */
int
putchar (int chr)
{
if (!output)
output_init (0);
if (output->putchar)
(*output->putchar) (chr);
return 0;
}
int
puts (const char *str)
{
while (*str != '\0')
putchar (*(str++));
putchar ('\n');
return 0;
}
static void
print_nr (unsigned long long nr, int base)
{
static char *digits = "0123456789abcdef";
char str[30];
int i = 0;
do
{
str[i++] = digits[nr % base];
nr = nr / base;
}
while (nr);
i--;
while (i >= 0)
putchar (str[i--]);
}
static void
print_signed_nr (long long nr, int base)
{
unsigned long long unr;
if (nr < 0)
{
putchar ('-');
unr = -nr;
}
else
unr = nr;
print_nr (unr, base);
}
int
printf (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
const char *p = fmt;
while (*p != '\0')
{
if (*p != '%')
{
putchar (*(p++));
continue;
}
p++;
switch (*p)
{
case '%':
putchar ('%');
p++;
break;
case 'l':
p++;
if (*p != 'l')
{
putchar ('%');
putchar ('l');
putchar (*(p++));
continue;
}
p++;
switch (*p)
{
case 'o':
print_nr (va_arg (ap, unsigned long long), 8);
p++;
break;
case 'd':
case 'i':
print_signed_nr (va_arg (ap, long long), 10);
p++;
break;
case 'x':
case 'X':
print_nr (va_arg (ap, unsigned long long), 16);
p++;
break;
case 'u':
print_nr (va_arg (ap, unsigned long long), 10);
p++;
break;
default:
putchar ('%');
putchar ('l');
putchar ('l');
putchar (*(p++));
break;
}
break;
case 'o':
print_nr (va_arg (ap, unsigned int), 8);
p++;
break;
case 'd':
case 'i':
print_signed_nr (va_arg (ap, int), 10);
p++;
break;
case 'x':
case 'X':
print_nr (va_arg (ap, unsigned int), 16);
p++;
break;
case 'u':
print_nr (va_arg (ap, unsigned int), 10);
p++;
break;
case 'c':
putchar (va_arg (ap, int));
p++;
break;
case 's':
{
char *str = va_arg (ap, char *);
while (*str)
putchar (*(str++));
}
p++;
break;
case 'p':
print_nr ((unsigned int) va_arg (ap, void *), 16);
p++;
break;
default:
putchar ('%');
putchar (*p);
p++;
break;
}
}
return 0;
}
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