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/* This file is part of the Project Athena Zephyr Notification System.
* It is one of the source files comprising zwgc, the Zephyr WindowGram
* client.
*
* Created by: Marc Horowitz <marc@athena.mit.edu>
*
* $Source$
* $Author$
*
* Copyright (c) 1989 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#if (!defined(lint) && !defined(SABER))
static char rcsid_standard_ports_c[] = "$Id$";
#endif
#include <zephyr/mit-copyright.h>
/****************************************************************************/
/* */
/* Code to setup standard ports: */
/* */
/****************************************************************************/
#include <stdio.h>
#include "new_memory.h"
#include "port.h"
#include "variables.h"
#include "error.h"
extern string tty_filter();
extern char *X_driver();
extern int X_driver_init();
extern int tty_filter_init();
/*
*
*/
char *plain_driver(input)
string input;
{
string processed_input = tty_filter(input, 0);
fputs(processed_input, stdout);
fflush(stdout);
free(processed_input);
return(NULL);
}
/*
*
*/
char *tty_driver(input)
string input;
{
string processed_input = tty_filter(input, 1);
fputs(processed_input, stdout);
fflush(stdout);
free(processed_input);
return(NULL);
}
/*
*
*/
string noop_filter(input)
string input;
{
return(input);
}
/*
*
*/
string plain_filter(input)
string input;
{
return(tty_filter(input, 0));
}
/*
*
*/
string fancy_filter(input)
string input;
{
return(tty_filter(input, 1));
}
/*
*
*/
static struct standard_port_info {
char *port_name;
/*
* 0 = ok to use as the default output port
* 1 = not ok to use as the default output port
* 2 = disabled
*/
#define DEFAULT_OK 0
#define DEFAULT_NOTOK 1
#define DISABLED 2
int port_setup_status;
int (*port_init)();
#define INPUT_DESC 0
#define OUTPUT_DESC 1
#define FILTER 2
#define OUTPUT_PROC 3
int type;
char *(*function)();
int setup_arg;
} standard_port_info_table[] = {
{ "X", DEFAULT_OK, X_driver_init, OUTPUT_PROC, X_driver, 0},
{ "tty", DEFAULT_NOTOK, tty_filter_init, OUTPUT_PROC, tty_driver, 0},
{ "plain", DEFAULT_NOTOK, tty_filter_init, OUTPUT_PROC, plain_driver, 0},
{ "stdout", DEFAULT_NOTOK, NULL, OUTPUT_DESC, NULL, 1},
{ "stderr", DEFAULT_NOTOK, NULL, OUTPUT_DESC, NULL, 2},
{ "stdin", DEFAULT_NOTOK, NULL, INPUT_DESC, NULL, 0},
{ "loopback", DEFAULT_NOTOK, NULL, FILTER, noop_filter, 0},
{ "plain_filter", DEFAULT_NOTOK, tty_filter_init, FILTER, plain_filter, 0},
{ "tty_filter", DEFAULT_NOTOK, tty_filter_init, FILTER, fancy_filter, 0},
{ NULL, DISABLED, NULL, FILTER, NULL, 0} };
/*
* <<<>>>
*/
static struct standard_port_info *get_standard_port_info(port_name)
string port_name;
{
struct standard_port_info *p;
for (p=standard_port_info_table; p->port_name; p++)
if (string_Eq(p->port_name, port_name) && p->port_setup_status!=DISABLED)
return(p);
return(NULL);
}
/*
* Internal Routine:
*
* int boolean_value_of(string text)
* Effects: If text represents yes/true/on, return 1. If text
* representes no/false/off, return 0. Otherwise,
* returns -1.
*/
static int boolean_value_of(text)
string text;
{
if (!text)
return(-1); /* not set */
if (!strcasecmp("yes", text) || !strcasecmp("y", text) ||
!strcasecmp("true", text) || !strcasecmp("t", text) ||
!strcasecmp("on", text))
return(1);
else if (!strcasecmp("no", text) || !strcasecmp("n", text) ||
!strcasecmp("false", text) || !strcasecmp("f", text) ||
!strcasecmp("off", text))
return(0);
else
return(-1);
}
/*
*
*/
void init_standard_ports(pargc, argv)
int *pargc;
char **argv;
{
struct standard_port_info *p;
string first_working_port = "";
string default_port = "";
char **new, **current;
int fallback;
/*
* Process argument list handling "-disable <port>" and
* "-default <output port>" arguments, as well as "-ttymode"
*/
for (new=current=argv+1; *current; current++) {
if (string_Eq((string) *current, "-disable")) {
current++; *pargc -= 2;
if (!*current)
usage();
if (p = get_standard_port_info((string) *current))
p->port_setup_status = DISABLED;
} else if (string_Eq((string) *current, "-default")) {
current++; *pargc -= 2;
if (!*current)
usage();
default_port = (string) *current;
if (p = get_standard_port_info((string) *current))
p->port_setup_status = DEFAULT_OK;
} else if (string_Eq((string) *current, "-ttymode")) {
default_port = (string) "tty";
(*pargc)--;
if (p = get_standard_port_info(default_port))
p->port_setup_status = DEFAULT_OK;
} else
*(new++) = *current;
}
*new = *current;
fallback = boolean_value_of(ZGetVariable("fallback"));
/*
* Initialize all non-disabled ports. If a port reports an error,
* disable that port. Set default_port if not already set
* by the -default argument to the first non-disabled port.
*/
for (p = standard_port_info_table; p->port_name; p++) {
if (p->port_setup_status == DISABLED)
continue;
if (p->port_init && (*(p->port_init))(p->port_name, pargc, argv)) {
p->port_setup_status = DISABLED;
continue;
}
if (fallback == 1) {
/* we are doing fallback, make DEFAULT_NOTOK ports OK */
p->port_setup_status = DEFAULT_OK;
}
if (!*first_working_port)
first_working_port = p->port_name;
switch (p->type) {
case INPUT_DESC:
create_port_from_files(p->port_name, fdopen(p->setup_arg, "r"),0);
break;
case OUTPUT_DESC:
create_port_from_files(p->port_name, 0, fdopen(p->setup_arg, "w"));
break;
case FILTER:
create_port_from_filter(p->port_name, p->function);
break;
case OUTPUT_PROC:
create_port_from_output_proc(p->port_name, p->function);
break;
}
}
if (!default_port[0]) {
/* no default port has been set */
for (p = get_standard_port_info(first_working_port); p->port_name; p++)
if ((p->port_setup_status == DEFAULT_OK))
break;
if (p->port_name)
var_set_variable("output_driver", p->port_name);
else { /* no suitable default has been found */
if (fallback == -1) /* complain, since indeterminate */
ERROR(
"\7\7\7There is no X display available, so zwgc cannot run.\n\
THIS MEANS THAT YOU WILL NOT RECEIVE ANY ZEPHYR MESSAGES.\n\
If you wish to receive Zephyr messages, you should start zwgc\n\
with the -ttymode option (type '/usr/etc/zwgc -ttymode').\n\
Read the zwgc(1) manual page for details on the fallback variable.\n\n");
exit(1);
}
} else
var_set_variable("output_driver", default_port);
}
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