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/**
* @file stdio.c Standard Input/Output UI module
*
* Copyright (C) 2010 Creytiv.com
*/
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <re.h>
#include <baresip.h>
/**
* @defgroup stdio stdio
*
* User-Interface (UI) module for standard input/output
*
* This module sets up the terminal in raw mode, and reads characters from the
* input to the UI subsystem. The module is indented for Unix-based systems.
*/
/** Local constants */
enum {
RELEASE_VAL = 250 /**< Key release value in [ms] */
};
struct ui_st {
struct tmr tmr;
struct termios term;
bool term_set;
};
/* We only allow one instance */
static struct ui_st *ui_state;
static void ui_destructor(void *arg)
{
struct ui_st *st = arg;
fd_close(STDIN_FILENO);
if (st->term_set)
tcsetattr(STDIN_FILENO, TCSANOW, &st->term);
tmr_cancel(&st->tmr);
}
static int print_handler(const char *p, size_t size, void *arg)
{
(void)arg;
return 1 == fwrite(p, size, 1, stderr) ? 0 : ENOMEM;
}
static void report_key(struct ui_st *ui, char key)
{
static struct re_printf pf_stderr = {print_handler, NULL};
(void)ui;
ui_input_key(key, &pf_stderr);
}
static void timeout(void *arg)
{
struct ui_st *st = arg;
/* Emulate key-release */
report_key(st, 0x00);
}
static void ui_fd_handler(int flags, void *arg)
{
struct ui_st *st = arg;
char key;
(void)flags;
if (1 != read(STDIN_FILENO, &key, 1)) {
return;
}
tmr_start(&st->tmr, RELEASE_VAL, timeout, st);
report_key(st, key);
}
static int term_setup(struct ui_st *st)
{
struct termios now;
if (tcgetattr(STDIN_FILENO, &st->term) < 0)
return errno;
now = st->term;
now.c_lflag |= ISIG;
now.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
/* required on Solaris */
now.c_cc[VMIN] = 1;
now.c_cc[VTIME] = 0;
if (tcsetattr(STDIN_FILENO, TCSANOW, &now) < 0)
return errno;
st->term_set = true;
return 0;
}
static int ui_alloc(struct ui_st **stp)
{
struct ui_st *st;
int err;
if (!stp)
return EINVAL;
st = mem_zalloc(sizeof(*st), ui_destructor);
if (!st)
return ENOMEM;
tmr_init(&st->tmr);
err = fd_listen(STDIN_FILENO, FD_READ, ui_fd_handler, st);
if (err)
goto out;
err = term_setup(st);
if (err) {
info("stdio: could not setup terminal: %m\n", err);
err = 0;
}
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
static struct ui ui_stdio = {
.name = "stdio"
};
static int module_init(void)
{
int err;
err = ui_alloc(&ui_state);
if (err)
return err;
ui_register(&ui_stdio);
return 0;
}
static int module_close(void)
{
ui_unregister(&ui_stdio);
ui_state = mem_deref(ui_state);
return 0;
}
const struct mod_export DECL_EXPORTS(stdio) = {
"stdio",
"ui",
module_init,
module_close
};
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