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/* output.c - Output routines.
Copyright (C) 2003, 2007, 2008 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 <hurd/stddef.h>
#include <stdarg.h>
#include <string.h>
#include "output.h"
/* The active output driver. */
static struct output_driver *default_device;
/* 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. */
bool
output_init (struct output_driver *device, const char *conf,
bool make_default)
{
const char *driver_args = NULL;
struct output_driver **out = &output_drivers[0];
if (conf)
{
while (*out)
{
unsigned int name_len = strlen ((*out)->name);
if (!strncmp (conf, (*out)->name, name_len))
{
const char *cfg = conf + name_len;
if (!*cfg || *cfg == ',')
{
if (*cfg)
driver_args = cfg + 1;
break;
}
}
out++;
}
if (!*out)
return false;
}
if (make_default && default_device)
{
output_deinit (default_device);
default_device = 0;
}
*device = **out;
if (device->init)
(*device->init) (device, driver_args);
if (make_default)
default_device = device;
return true;
}
/* 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 (struct output_driver *device)
{
if (device && device->deinit)
(*device->deinit) (device);
}
/* Print the single character CHR on the output device. */
int
device_putchar (struct output_driver *device, int chr)
{
if (device && device->putchar)
device->putchar (device, chr);
return 0;
}
int
putchar (int chr)
{
return device_putchar (default_device, chr);
}
#ifndef _ENABLE_TESTS
int
puts (const char *str)
{
return s_puts (str);
}
int
vprintf (const char *fmt, va_list ap)
{
return s_vprintf (fmt, ap);
}
int
printf (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
int r = s_vprintf (fmt, ap);
va_end (ap);
return r;
}
#endif
int
device_getchar (struct output_driver *device)
{
if (! device)
panic ("Attempt to read but no device given!");
if (! device->getchar)
panic ("Attempt to read from device (%s) with no input stream",
device->name);
return device->getchar (device);
}
int
getchar (void)
{
if (! default_device)
panic ("Attempt to read but no default device configured");
return device_getchar (default_device);
}
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