freebsd-dev/sys/boot/common/console.c

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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stand.h>
#include <string.h>
#include "bootstrap.h"
/*
* Core console support
*/
static int cons_set(struct env_var *ev, int flags, const void *value);
static int cons_find(const char *name);
static int cons_check(const char *string);
static void cons_change(const char *string);
/*
* Detect possible console(s) to use. If preferred console(s) have been
* specified, mark them as active. Else, mark the first probed console
* as active. Also create the console variable.
*/
void
cons_probe(void)
{
int cons;
int active;
char *prefconsole;
/* Do all console probes */
for (cons = 0; consoles[cons] != NULL; cons++) {
consoles[cons]->c_flags = 0;
consoles[cons]->c_probe(consoles[cons]);
}
/* Now find the first working one */
active = -1;
for (cons = 0; consoles[cons] != NULL && active == -1; cons++) {
consoles[cons]->c_flags = 0;
consoles[cons]->c_probe(consoles[cons]);
if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))
active = cons;
}
/* Force a console even if all probes failed */
if (active == -1)
active = 0;
/* Check to see if a console preference has already been registered */
prefconsole = getenv("console");
if (prefconsole != NULL)
prefconsole = strdup(prefconsole);
if (prefconsole != NULL) {
unsetenv("console"); /* we want to replace this */
cons_change(prefconsole);
} else {
consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
consoles[active]->c_init(0);
prefconsole = strdup(consoles[active]->c_name);
}
printf("Consoles: ");
for (cons = 0; consoles[cons] != NULL; cons++)
if (consoles[cons]->c_flags & (C_ACTIVEIN | C_ACTIVEOUT))
printf("%s ", consoles[cons]->c_desc);
printf("\n");
if (prefconsole != NULL) {
env_setenv("console", EV_VOLATILE, prefconsole, cons_set,
env_nounset);
free(prefconsole);
}
}
int
getchar(void)
{
int cons;
int rv;
/* Loop forever polling all active consoles */
for(;;)
for (cons = 0; consoles[cons] != NULL; cons++)
if ((consoles[cons]->c_flags & C_ACTIVEIN) &&
((rv = consoles[cons]->c_in()) != -1))
return(rv);
}
int
ischar(void)
{
int cons;
for (cons = 0; consoles[cons] != NULL; cons++)
if ((consoles[cons]->c_flags & C_ACTIVEIN) &&
(consoles[cons]->c_ready() != 0))
return(1);
return(0);
}
void
putchar(int c)
{
int cons;
/* Expand newlines */
if (c == '\n')
putchar('\r');
for (cons = 0; consoles[cons] != NULL; cons++)
if (consoles[cons]->c_flags & C_ACTIVEOUT)
consoles[cons]->c_out(c);
}
/*
* Find the console with the specified name.
*/
static int
cons_find(const char *name)
{
int cons;
for (cons = 0; consoles[cons] != NULL; cons++)
if (!strcmp(consoles[cons]->c_name, name))
return (cons);
return (-1);
}
/*
* Select one or more consoles.
*/
static int
cons_set(struct env_var *ev, int flags, const void *value)
{
int cons;
if ((value == NULL) || (cons_check(value) == -1)) {
if (value != NULL)
printf("no such console!\n");
printf("Available consoles:\n");
for (cons = 0; consoles[cons] != NULL; cons++)
printf(" %s\n", consoles[cons]->c_name);
return(CMD_ERROR);
}
cons_change(value);
env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
return(CMD_OK);
}
/*
* Check that all of the consoles listed in *string are valid consoles
*/
static int
cons_check(const char *string)
{
int cons;
char *curpos, *dup, *next;
dup = next = strdup(string);
cons = -1;
while (next != NULL) {
curpos = strsep(&next, " ,");
if (*curpos != '\0') {
cons = cons_find(curpos);
if (cons == -1)
break;
}
}
free(dup);
return (cons);
}
/*
* Activate all of the consoles listed in *string and disable all the others.
*/
static void
cons_change(const char *string)
{
int cons;
char *curpos, *dup, *next;
/* Disable all consoles */
for (cons = 0; consoles[cons] != NULL; cons++) {
consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT);
}
/* Enable selected consoles */
dup = next = strdup(string);
while (next != NULL) {
curpos = strsep(&next, " ,");
if (*curpos == '\0')
continue;
cons = cons_find(curpos);
if (cons >= 0) {
consoles[cons]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
consoles[cons]->c_init(0);
}
}
free(dup);
}