/* * Mini xargs implementation for busybox * * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org> * Remixed by Mark Whitley <markw@codepoet.org> * * 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 * (at your option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */#include <stdio.h>#include <stdlib.h>#include <string.h>#include "busybox.h"int xargs_main(int argc, char **argv){	char *cmd_to_be_executed;	char *file_to_act_on;	int i;	int len;	/*	 * No options are supported in this version of xargs; no getopt.	 *	 * Re: The missing -t flag: Most programs that produce output also print	 * the filename, so xargs doesn't really need to do it again. Supporting	 * the -t flag =greatly= bloats up the size of this app and the memory it	 * uses because you have to buffer all the input file strings in memory. If	 * you really want to see the filenames that xargs will act on, just run it	 * once with no args and xargs will echo the filename. Simple.	 */	argv++;	len = argc;     /* arg = count for ' ' + trailing '\0' */	/* Store the command to be executed (taken from the command line) */	if (argc == 1) {		/* default behavior is to echo all the filenames */		argv[0] = "/bin/echo";		len++;  /* space for trailing '\0' */	} else {		argc--;		}	/* concatenate all the arguments passed to xargs together */	for (i = 0; i < argc; i++)		len += strlen(argv[i]);	cmd_to_be_executed = xmalloc (len);	for (i = len = 0; i < argc; i++) {		len = sprintf(cmd_to_be_executed + len, "%s ", argv[i]);	}	/* Now, read in one line at a time from stdin, and store this 	 * line to be used later as an argument to the command */	while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) {		FILE *cmd_output;		char *output_line;		char *execstr;		/* eat the newline off the filename. */		chomp(file_to_act_on);		/* eat blank lines */		if (file_to_act_on[0] == 0)			continue;		/* assemble the command and execute it */		execstr = xcalloc(strlen(cmd_to_be_executed) +				strlen(file_to_act_on) + 1, sizeof(char));		strcat(execstr, cmd_to_be_executed);		strcat(execstr, file_to_act_on);				cmd_output = popen(execstr, "r");		if (cmd_output == NULL)			perror_msg_and_die("popen");		/* harvest the output */		while ((output_line = get_line_from_file(cmd_output)) != NULL) {			fputs(output_line, stdout);			free(output_line);		}		/* clean up */		pclose(cmd_output);		free(execstr);		free(file_to_act_on);	}#ifdef BB_FEATURE_CLEAN_UP	free(cmd_to_be_executed);#endif	return 0;}/* vi: set sw=4 ts=4: */