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/* vi: set sw=4 ts=4: */
/*
* Mini xargs implementation for busybox
*
* Copyright (C) 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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 "busybox.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/wait.h>
int xargs_main(int argc, char **argv)
{
char *in_from_stdin = NULL;
char *args = NULL;
char *cmd_to_be_executed = NULL;
char traceflag = 0;
int len_args=10, len_cmd_to_be_executed, opt;
pid_t pid;
int wpid, status;
/* Note that we do not use getopt here, since
* we only want to interpret initial options,
* not options passed to commands */
while (--argc && **(++argv) == '-') {
while (*++(*argv)) {
switch (**argv) {
case 't':
traceflag=1;
break;
default:
fatalError(xargs_usage);
}
}
}
/* Store the command to be executed (taken from the command line) */
if (argc == 0) {
len_cmd_to_be_executed=6;
cmd_to_be_executed = xmalloc(len_cmd_to_be_executed);
strcat(cmd_to_be_executed, "echo");
} else {
opt=strlen(*argv);
len_cmd_to_be_executed = (opt > 10)? opt : 10;
cmd_to_be_executed = xcalloc(len_cmd_to_be_executed, sizeof(char));
strcat(cmd_to_be_executed, *argv);
}
/* Now, read in one line at a time from stdin, and stroe this to be used later
* as an argument to the command we just stored */
in_from_stdin = get_line_from_file(stdin);
for (;in_from_stdin!=NULL;) {
char *tmp;
opt = strlen(in_from_stdin);
len_args += opt + 3;
args=xrealloc(args, len_args);
/* Strip out the final \n */
in_from_stdin[opt-1]=' ';
/* Replace any tabs with spaces */
while( (tmp = strchr(in_from_stdin, '\t')) != NULL )
*tmp=' ';
/* Strip out any extra intra-word spaces */
while( (tmp = strstr(in_from_stdin, " ")) != NULL ) {
opt = strlen(in_from_stdin);
memmove(tmp, tmp+1, opt-(tmp-in_from_stdin));
}
/* trim trailing whitespace */
opt = strlen(in_from_stdin) - 1;
while (isspace(in_from_stdin[opt]))
opt--;
in_from_stdin[++opt] = 0;
/* Strip out any leading whitespace */
tmp=in_from_stdin;
while(isspace(*tmp))
tmp++;
strcat(args, tmp);
strcat(args, " ");
free(in_from_stdin);
in_from_stdin = get_line_from_file(stdin);
}
if (traceflag==1) {
fputs(cmd_to_be_executed, stderr);
fputs(args, stderr);
}
if ((pid = fork()) == 0) {
char *cmd[255];
int i=1;
//printf("argv[0]='%s'\n", cmd_to_be_executed);
cmd[0] = cmd_to_be_executed;
while (--argc && ++argv && *argv ) {
//printf("argv[%d]='%s'\n", i, *argv);
cmd[i++]=*argv;
}
//printf("argv[%d]='%s'\n", i, args);
cmd[i++] = args;
cmd[i] = NULL;
execvp(cmd_to_be_executed, cmd);
/* What? Still here? Exit with an error */
fatalError("%s: %s\n", cmd_to_be_executed, strerror(errno));
}
/* Wait for a child process to exit */
wpid = wait(&status);
#ifdef BB_FEATURE_CLEAN_UP
free(args);
free(cmd_to_be_executed);
#endif
if (wpid > 0)
return (WEXITSTATUS(status));
else
return EXIT_FAILURE;
}
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
|
