mirror of
https://github.com/topjohnwu/ndk-busybox.git
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109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*
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* Mini xargs implementation for busybox
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*
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* Copyright (C) 2000 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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* Remixed by Mark Whitley <markw@lineo.com>, <markw@enol.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "busybox.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int xargs_main(int argc, char **argv)
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{
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char *cmd_to_be_executed = NULL;
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char *file_to_act_on = NULL;
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/*
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* No options are supported in this version of xargs; no getopt.
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*
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* Re: The missing -t flag: Most programs that produce output also print
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* the filename, so xargs doesn't really need to do it again. Supporting
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* the -t flag =greatly= bloats up the size of this app and the memory it
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* uses because you have to buffer all the input file strings in memory. If
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* you really want to see the filenames that xargs will act on, just run it
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* once with no args and xargs will echo the filename. Simple.
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*/
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/* Store the command to be executed (taken from the command line) */
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if (argc == 1) {
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/* default behavior is to echo all the filenames */
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cmd_to_be_executed = strdup("/bin/echo ");
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} else {
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/* concatenate all the arguments passed to xargs together */
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int i;
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int len = 1; /* for the '\0' */
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for (i = 1; i < argc; i++) {
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len += strlen(argv[i]);
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len += 1; /* for the space between the args */
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cmd_to_be_executed = xrealloc(cmd_to_be_executed, len);
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strcat(cmd_to_be_executed, argv[i]);
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strcat(cmd_to_be_executed, " ");
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}
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}
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/* Now, read in one line at a time from stdin, and store this
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* line to be used later as an argument to the command */
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while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) {
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FILE *cmd_output = NULL;
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char *output_line = NULL;
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char *execstr = NULL;
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/* eat the newline off the filename. */
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if (file_to_act_on[strlen(file_to_act_on)-1] == '\n')
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file_to_act_on[strlen(file_to_act_on)-1] = '\0';
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/* eat blank lines */
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if (strlen(file_to_act_on) == 0)
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continue;
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/* assemble the command and execute it */
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execstr = xcalloc(strlen(cmd_to_be_executed) +
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strlen(file_to_act_on) + 1, sizeof(char));
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strcat(execstr, cmd_to_be_executed);
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strcat(execstr, file_to_act_on);
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cmd_output = popen(execstr, "r");
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if (cmd_output == NULL) {
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perror("popen");
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exit(1);
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}
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/* harvest the output */
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while ((output_line = get_line_from_file(cmd_output)) != NULL) {
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fputs(output_line, stdout);
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free(output_line);
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}
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/* clean up */
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pclose(cmd_output);
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free(execstr);
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free(file_to_act_on);
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}
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#ifdef BB_FEATURE_CLEAN_UP
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free(cmd_to_be_executed);
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#endif
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return 0;
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}
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/* vi: set sw=4 ts=4: */
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