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- /*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * 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; either version 2 of the
- * License, or any later version.
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <stdint.h>
- #include <string.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <getopt.h>
- #include <errno.h>
- #include <assert.h>
- #include <gpxe/tables.h>
- #include <gpxe/command.h>
-
- /** @file
- *
- * Command execution
- *
- */
-
- static struct command commands[0]
- __table_start ( struct command, commands );
- static struct command commands_end[0]
- __table_end ( struct command, commands );
-
- /* Avoid dragging in getopt.o unless a command really uses it */
- int optind;
- int nextchar;
-
- /**
- * Execute command
- *
- * @v command Command name
- * @v argv Argument list
- * @ret rc Command exit status
- *
- * Execute the named command. Unlike a traditional POSIX execv(),
- * this function returns the exit status of the command.
- */
- int execv ( const char *command, char * const argv[] ) {
- struct command *cmd;
- int argc;
-
- /* Count number of arguments */
- for ( argc = 0 ; argv[argc] ; argc++ ) {}
-
- /* Sanity checks */
- if ( ! command ) {
- DBG ( "No command\n" );
- return -EINVAL;
- }
- if ( ! argc ) {
- DBG ( "%s: empty argument list\n", command );
- return -EINVAL;
- }
-
- /* Reset getopt() library ready for use by the command. This
- * is an artefact of the POSIX getopt() API within the context
- * of Etherboot; see the documentation for reset_getopt() for
- * details.
- */
- reset_getopt();
-
- /* Hand off to command implementation */
- for ( cmd = commands ; cmd < commands_end ; cmd++ ) {
- if ( strcmp ( command, cmd->name ) == 0 )
- return cmd->exec ( argc, ( char ** ) argv );
- }
-
- printf ( "%s: command not found\n", command );
- return -ENOEXEC;
- }
-
- /**
- * Split command line into argv array
- *
- * @v args Command line
- * @v argv Argument array to populate, or NULL
- * @ret argc Argument count
- *
- * Splits the command line into whitespace-delimited arguments. If @c
- * argv is non-NULL, any whitespace in the command line will be
- * replaced with NULs.
- */
- static int split_args ( char *args, char * argv[] ) {
- int argc = 0;
-
- while ( 1 ) {
- /* Skip over any whitespace / convert to NUL */
- while ( *args == ' ' ) {
- if ( argv )
- *args = '\0';
- args++;
- }
- /* Check for end of line */
- if ( ! *args )
- break;
- /* We have found the start of the next argument */
- if ( argv )
- argv[argc] = args;
- argc++;
- /* Skip to start of next whitespace, if any */
- while ( *args && ( *args != ' ' ) ) {
- args++;
- }
- }
- return argc;
- }
-
- /**
- * Execute command line
- *
- * @v command Command line
- * @ret rc Command exit status
- *
- * Execute the named command and arguments.
- */
- int system ( const char *command ) {
- char *args;
- int argc;
- int rc = 0;
-
- /* Obtain temporary modifiable copy of command line */
- args = strdup ( command );
- if ( ! args )
- return -ENOMEM;
-
- /* Count arguments */
- argc = split_args ( args, NULL );
-
- /* Create argv array and execute command */
- if ( argc ) {
- char * argv[argc + 1];
-
- split_args ( args, argv );
- argv[argc] = NULL;
-
- if ( argv[0][0] != '#' )
- rc = execv ( argv[0], argv );
- }
-
- free ( args );
- return rc;
- }
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