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160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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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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*
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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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <getopt.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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int xargs_main(int argc, char **argv)
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{
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char *in_from_stdin = NULL;
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char *args = NULL;
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char *cmd_to_be_executed = NULL;
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char traceflag = 0;
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int len_args=0, len_cmd_to_be_executed, opt;
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pid_t pid;
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int wpid, status;
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/* Note that we do not use getopt here, since
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* we only want to interpret initial options,
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* not options passed to commands */
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while (--argc && **(++argv) == '-') {
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while (*++(*argv)) {
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switch (**argv) {
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case 't':
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traceflag=1;
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break;
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default:
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fatalError(xargs_usage);
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}
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}
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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 == 0) {
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len_cmd_to_be_executed=6;
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cmd_to_be_executed = xmalloc(len_cmd_to_be_executed);
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strcat(cmd_to_be_executed, "echo");
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} else {
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opt=strlen(*argv);
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len_cmd_to_be_executed = (opt > 10)? opt : 10;
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cmd_to_be_executed = xcalloc(len_cmd_to_be_executed, sizeof(char));
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strcat(cmd_to_be_executed, *argv);
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}
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//args=xrealloc(args, len_args);
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// strcpy(args, " ");
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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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in_from_stdin = get_line_from_file(stdin);
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for (;in_from_stdin!=NULL;) {
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char *tmp;
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opt = strlen(in_from_stdin);
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len_args += opt + 3;
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args=xrealloc(args, len_args);
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/* Strip out the final \n */
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in_from_stdin[opt-1]=' ';
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/* Replace any tabs with spaces */
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while( (tmp = strchr(in_from_stdin, '\t')) != NULL )
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*tmp=' ';
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/* Strip out any extra intra-word spaces */
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while( (tmp = strstr(in_from_stdin, " ")) != NULL ) {
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opt = strlen(in_from_stdin);
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memmove(tmp, tmp+1, opt-(tmp-in_from_stdin));
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}
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/* trim trailing whitespace */
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opt = strlen(in_from_stdin) - 1;
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while (isspace(in_from_stdin[opt]))
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opt--;
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in_from_stdin[++opt] = 0;
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/* Strip out any leading whitespace */
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tmp=in_from_stdin;
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while(isspace(*tmp))
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tmp++;
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strcat(args, tmp);
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strcat(args, " ");
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free(in_from_stdin);
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in_from_stdin = get_line_from_file(stdin);
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}
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if ((pid = fork()) == 0) {
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char *cmd[255];
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int i=1;
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if (traceflag==1) {
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fprintf(stderr, "%s ", cmd_to_be_executed);
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}
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cmd[0] = cmd_to_be_executed;
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while (--argc && ++argv && *argv ) {
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if (traceflag==1) {
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fprintf(stderr, "%s ", *argv);
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}
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cmd[i++]=*argv;
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}
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if (traceflag==1) {
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fprintf(stderr, "%s\n", args);
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}
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cmd[i++] = args;
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cmd[i] = NULL;
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execvp(cmd_to_be_executed, cmd);
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/* What? Still here? Exit with an error */
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fatalError("%s: %s\n", cmd_to_be_executed, strerror(errno));
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}
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/* Wait for a child process to exit */
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wpid = wait(&status);
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#ifdef BB_FEATURE_CLEAN_UP
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free(args);
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free(cmd_to_be_executed);
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#endif
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if (wpid > 0)
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return (WEXITSTATUS(status));
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else
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return EXIT_FAILURE;
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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