freebsd-skq/sys/boot/common/commands.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"
char *command_errmsg;
char command_errbuf[256]; /* XXX should have procedural interface for setting, size limit? */
static int page_file(char *filename);
/*
* Help is read from a formatted text file.
*
* Entries in the file are formatted as
# Ttopic [Ssubtopic] Ddescription
help
text
here
#
*
* Note that for code simplicity's sake, the above format must be followed
* exactly.
*
* Subtopic entries must immediately follow the topic (this is used to
* produce the listing of subtopics).
*
* If no argument(s) are supplied by the user, the help for 'help' is displayed.
*/
COMMAND_SET(help, "help", "detailed help", command_help);
static int
help_getnext(int fd, char **topic, char **subtopic, char **desc)
{
char line[81], *cp, *ep;
for (;;) {
if (fgetstr(line, 80, fd) < 0)
return(0);
if ((strlen(line) < 3) || (line[0] != '#') || (line[1] != ' '))
continue;
*topic = *subtopic = *desc = NULL;
cp = line + 2;
while((cp != NULL) && (*cp != 0)) {
ep = strchr(cp, ' ');
if ((*cp == 'T') && (*topic == NULL)) {
if (ep != NULL)
*ep++ = 0;
*topic = strdup(cp + 1);
} else if ((*cp == 'S') && (*subtopic == NULL)) {
if (ep != NULL)
*ep++ = 0;
*subtopic = strdup(cp + 1);
} else if (*cp == 'D') {
*desc = strdup(cp + 1);
ep = NULL;
}
cp = ep;
}
if (*topic == NULL) {
if (*subtopic != NULL)
free(*subtopic);
if (*desc != NULL)
free(*desc);
continue;
}
return(1);
}
}
static void
help_emitsummary(char *topic, char *subtopic, char *desc)
{
int i;
pager_output(" ");
pager_output(topic);
i = strlen(topic);
if (subtopic != NULL) {
pager_output(" ");
pager_output(subtopic);
i += strlen(subtopic) + 1;
}
if (desc != NULL) {
do {
pager_output(" ");
} while (i++ < 30);
pager_output(desc);
}
pager_output("\n");
}
static int
command_help(int argc, char *argv[])
{
char buf[81]; /* XXX buffer size? */
int hfd, matched, doindex;
char *topic, *subtopic, *t, *s, *d;
/* page the help text from our load path */
sprintf(buf, "%s/boot/loader.help", getenv("loaddev"));
if ((hfd = open(buf, O_RDONLY)) < 0) {
printf("Verbose help not available, use '?' to list commands\n");
return(CMD_OK);
}
/* pick up request from arguments */
topic = subtopic = NULL;
switch(argc) {
case 3:
subtopic = strdup(argv[2]);
case 2:
topic = strdup(argv[1]);
break;
case 1:
topic = strdup("help");
break;
default:
command_errmsg = "usage is 'help <topic> [<subtopic>]";
return(CMD_ERROR);
}
/* magic "index" keyword */
doindex = !strcmp(topic, "index");
matched = doindex;
/* Scan the helpfile looking for help matching the request */
pager_open();
while(help_getnext(hfd, &t, &s, &d)) {
if (doindex) { /* dink around formatting */
help_emitsummary(t, s, d);
} else if (strcmp(topic, t)) {
/* topic mismatch */
if(matched) /* nothing more on this topic, stop scanning */
break;
} else {
/* topic matched */
matched = 1;
if (((subtopic == NULL) && (s == NULL)) ||
((subtopic != NULL) && (s != NULL) && !strcmp(subtopic, s))) {
/* exact match, print text */
while((fgetstr(buf, 80, hfd) >= 0) && (buf[0] != '#')) {
if (pager_output(buf))
break;
if (pager_output("\n"))
break;
}
} else if ((subtopic == NULL) && (s != NULL)) {
/* topic match, list subtopics */
help_emitsummary(t, s, d);
}
}
free(t);
free(s);
free(d);
}
pager_close();
close(hfd);
if (!matched) {
sprintf(command_errbuf, "no help available for '%s'", topic);
free(topic);
if (subtopic)
free(subtopic);
return(CMD_ERROR);
}
free(topic);
if (subtopic)
free(subtopic);
return(CMD_OK);
}
COMMAND_SET(commandlist, "?", "list commands", command_commandlist);
static int
command_commandlist(int argc, char *argv[])
{
struct bootblk_command **cmdp;
printf("Available commands:\n");
SET_FOREACH(cmdp, Xcommand_set) {
if (((*cmdp)->c_name != NULL) && ((*cmdp)->c_desc != NULL))
printf(" %-15s %s\n", (*cmdp)->c_name, (*cmdp)->c_desc);
}
return(CMD_OK);
}
/*
* XXX set/show should become set/echo if we have variable
* substitution happening.
*/
COMMAND_SET(show, "show", "show variable(s)", command_show);
static int
command_show(int argc, char *argv[])
{
struct env_var *ev;
char *cp;
if (argc < 2) {
/*
* With no arguments, print everything.
*/
pager_open();
for (ev = environ; ev != NULL; ev = ev->ev_next) {
pager_output(ev->ev_name);
cp = getenv(ev->ev_name);
if (cp != NULL) {
pager_output("=");
pager_output(cp);
}
if (pager_output("\n"))
break;
}
pager_close();
} else {
if ((cp = getenv(argv[1])) != NULL) {
printf("%s\n", cp);
} else {
sprintf(command_errbuf, "variable '%s' not found", argv[1]);
return(CMD_ERROR);
}
}
return(CMD_OK);
}
COMMAND_SET(set, "set", "set a variable", command_set);
static int
command_set(int argc, char *argv[])
{
int err;
if (argc != 2) {
command_errmsg = "wrong number of arguments";
return(CMD_ERROR);
} else {
if ((err = putenv(argv[1])) != 0) {
command_errmsg = strerror(err);
return(CMD_ERROR);
}
}
return(CMD_OK);
}
COMMAND_SET(unset, "unset", "unset a variable", command_unset);
static int
command_unset(int argc, char *argv[])
{
int err;
if (argc != 2) {
command_errmsg = "wrong number of arguments";
return(CMD_ERROR);
} else {
if ((err = unsetenv(argv[1])) != 0) {
command_errmsg = strerror(err);
return(CMD_ERROR);
}
}
return(CMD_OK);
}
Bootstrap updates. - Move some startup code from MD to MI sections - Add a 'copyout' and some copyout-related functions. These will be obsoleted when BTX is available for the 386 and the kernel load area becomes directly addressable. - Add the ability load an arbitrary file as a module, associating and arbitrary type string with it. This can be used eg. for loading splash-screen images etc. - Add KLD module dependancy infrastructure. We know how to look for dependancies inside KLD modules, how to resolve these dependancies and what to do if things go wrong. Only works for a.out at the moment, due to lack of an MI ELF loader. Attach KLD module information to loaded modules as metadata, but don't pass it to the kernel (it can find it itself). - Load a.out KLD modules on a page boundary. Only pad the a.out BSS for the kernel, as it may want to throw symbols away. (We might want to do this for KLD modules too.) - Allow commands to be hidden from the '?' display, to avoid cluttering it with things like 'echo'. Add 'echo'. - Bring the 'prompt' command into line with the parser syntax. - Fix the verbose 'ls'; it was using an uninitialised stack variable. - Add a '-v' flag to 'lsmod' to have it display module metadata as well (not terribly useful for the average user) - Support a 'module searchpath' for required modules. - The bootstrap file on i386 is now called 'loader' to permit the /boot directory to use that name. - Discard the old i386 pread() function, as it's replaced by arch_readin()
1998-09-03 02:10:09 +00:00
COMMAND_SET(echo, "echo", NULL, command_echo);
static int
command_echo(int argc, char *argv[])
{
char *s;
int nl, ch;
nl = 0;
optind = 1;
optreset = 1;
Bootstrap updates. - Move some startup code from MD to MI sections - Add a 'copyout' and some copyout-related functions. These will be obsoleted when BTX is available for the 386 and the kernel load area becomes directly addressable. - Add the ability load an arbitrary file as a module, associating and arbitrary type string with it. This can be used eg. for loading splash-screen images etc. - Add KLD module dependancy infrastructure. We know how to look for dependancies inside KLD modules, how to resolve these dependancies and what to do if things go wrong. Only works for a.out at the moment, due to lack of an MI ELF loader. Attach KLD module information to loaded modules as metadata, but don't pass it to the kernel (it can find it itself). - Load a.out KLD modules on a page boundary. Only pad the a.out BSS for the kernel, as it may want to throw symbols away. (We might want to do this for KLD modules too.) - Allow commands to be hidden from the '?' display, to avoid cluttering it with things like 'echo'. Add 'echo'. - Bring the 'prompt' command into line with the parser syntax. - Fix the verbose 'ls'; it was using an uninitialised stack variable. - Add a '-v' flag to 'lsmod' to have it display module metadata as well (not terribly useful for the average user) - Support a 'module searchpath' for required modules. - The bootstrap file on i386 is now called 'loader' to permit the /boot directory to use that name. - Discard the old i386 pread() function, as it's replaced by arch_readin()
1998-09-03 02:10:09 +00:00
while ((ch = getopt(argc, argv, "n")) != -1) {
switch(ch) {
case 'n':
nl = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind);
argc -= (optind);
s = unargv(argc, argv);
if (s != NULL) {
printf("%s", s);
Bootstrap updates. - Move some startup code from MD to MI sections - Add a 'copyout' and some copyout-related functions. These will be obsoleted when BTX is available for the 386 and the kernel load area becomes directly addressable. - Add the ability load an arbitrary file as a module, associating and arbitrary type string with it. This can be used eg. for loading splash-screen images etc. - Add KLD module dependancy infrastructure. We know how to look for dependancies inside KLD modules, how to resolve these dependancies and what to do if things go wrong. Only works for a.out at the moment, due to lack of an MI ELF loader. Attach KLD module information to loaded modules as metadata, but don't pass it to the kernel (it can find it itself). - Load a.out KLD modules on a page boundary. Only pad the a.out BSS for the kernel, as it may want to throw symbols away. (We might want to do this for KLD modules too.) - Allow commands to be hidden from the '?' display, to avoid cluttering it with things like 'echo'. Add 'echo'. - Bring the 'prompt' command into line with the parser syntax. - Fix the verbose 'ls'; it was using an uninitialised stack variable. - Add a '-v' flag to 'lsmod' to have it display module metadata as well (not terribly useful for the average user) - Support a 'module searchpath' for required modules. - The bootstrap file on i386 is now called 'loader' to permit the /boot directory to use that name. - Discard the old i386 pread() function, as it's replaced by arch_readin()
1998-09-03 02:10:09 +00:00
free(s);
}
if (!nl)
printf("\n");
return(CMD_OK);
}
/*
* A passable emulation of the sh(1) command of the same name.
*/
COMMAND_SET(read, "read", NULL, command_read);
static int
command_read(int argc, char *argv[])
{
char *prompt;
int timeout;
time_t when;
char *cp;
char *name;
char buf[256]; /* XXX size? */
int c;
timeout = -1;
prompt = NULL;
optind = 1;
optreset = 1;
while ((c = getopt(argc, argv, "p:t:")) != -1) {
switch(c) {
case 'p':
prompt = optarg;
break;
case 't':
timeout = strtol(optarg, &cp, 0);
if (cp == optarg) {
sprintf(command_errbuf, "bad timeout '%s'", optarg);
return(CMD_ERROR);
}
break;
default:
return(CMD_OK);
}
}
argv += (optind);
argc -= (optind);
name = (argc > 0) ? argv[0]: NULL;
if (prompt != NULL)
printf("%s", prompt);
if (timeout >= 0) {
when = time(NULL) + timeout;
while (!ischar())
if (time(NULL) >= when)
return(CMD_OK); /* is timeout an error? */
}
ngets(buf, sizeof(buf));
if (name != NULL)
setenv(name, buf, 1);
return(CMD_OK);
}
/*
* File pager
*/
COMMAND_SET(more, "more", "show contents of a file", command_more);
static int
command_more(int argc, char *argv[])
{
int i;
int res;
char line[80];
res=0;
pager_open();
for (i = 1; (i < argc) && (res == 0); i++) {
sprintf(line, "*** FILE %s BEGIN ***\n", argv[i]);
if (pager_output(line))
break;
res = page_file(argv[i]);
if (!res) {
sprintf(line, "*** FILE %s END ***\n", argv[i]);
res = pager_output(line);
}
}
pager_close();
if (res == 0)
return CMD_OK;
else
return CMD_ERROR;
}
static int
page_file(char *filename)
{
int result;
result = pager_file(filename);
if (result == -1)
sprintf(command_errbuf, "error showing %s", filename);
return result;
}
/*
* List all disk-like devices
*/
COMMAND_SET(lsdev, "lsdev", "list all devices", command_lsdev);
static int
command_lsdev(int argc, char *argv[])
{
int verbose, ch, i;
char line[80];
verbose = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "v")) != -1) {
switch(ch) {
case 'v':
verbose = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind);
argc -= (optind);
pager_open();
for (i = 0; devsw[i] != NULL; i++) {
if (devsw[i]->dv_print != NULL){
sprintf(line, "%s devices:\n", devsw[i]->dv_name);
if (pager_output(line))
break;
devsw[i]->dv_print(verbose);
} else {
sprintf(line, "%s: (unknown)\n", devsw[i]->dv_name);
if (pager_output(line))
break;
}
}
pager_close();
return(CMD_OK);
}