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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* 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; version 2 of the License.
*
* 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 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 02111-1307 USA.
*/
#include "ao.h"
/*
* Basic I/O functions to support SDCC stdio package
*/
#define AO_NUM_STDIOS 2
static __xdata struct ao_stdio stdios[AO_NUM_STDIOS];
static __data int8_t ao_cur_stdio;
static __data int8_t ao_num_stdios;
void
putchar(char c)
{
if (c == '\n')
(*stdios[ao_cur_stdio].putchar)('\r');
(*stdios[ao_cur_stdio].putchar)(c);
}
void
flush(void)
{
if (stdios[ao_cur_stdio].flush)
stdios[ao_cur_stdio].flush();
}
__xdata uint8_t ao_stdin_ready;
char
getchar(void) __reentrant __critical
{
char c;
int8_t stdio = ao_cur_stdio;
for (;;) {
c = stdios[stdio].pollchar();
if (c != AO_READ_AGAIN)
break;
if (++stdio == ao_num_stdios)
stdio = 0;
if (stdio == ao_cur_stdio)
ao_sleep(&ao_stdin_ready);
}
ao_cur_stdio = stdio;
return c;
}
void
ao_add_stdio(char (*pollchar)(void),
void (*putchar)(char),
void (*flush)(void))
{
if (ao_num_stdios == AO_NUM_STDIOS)
ao_panic(AO_PANIC_STDIO);
stdios[ao_num_stdios].pollchar = pollchar;
stdios[ao_num_stdios].putchar = putchar;
stdios[ao_num_stdios].flush = flush;
ao_num_stdios++;
}
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