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127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/*
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* Mini xargs implementation for busybox
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* Only "-prt" options are supported in this version of xargs.
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*
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* (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
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*
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* Special thanks Mark Whitley for stimul to rewrote :)
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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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "busybox.h"
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/*
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This function have special algorithm.
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Don`t use fork and include to main!
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*/
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static void xargs_exec(char * const * args)
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{
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int p;
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int common[4]; /* shared vfork stack */
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common[0] = 0;
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if ((p = vfork()) >= 0) {
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if (p == 0) {
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/* vfork -- child */
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execvp(args[0], args);
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common[0] = errno; /* set error to shared stack */
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_exit(1);
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} else {
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/* vfork -- parent */
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wait(NULL);
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if(common[0]) {
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errno = common[0];
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bb_perror_msg_and_die("%s", args[0]);
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}
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}
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} else {
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bb_perror_msg_and_die("vfork");
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}
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}
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int xargs_main(int argc, char **argv)
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{
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char *file_to_act_on;
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char **args;
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int i, a;
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char flg_vi = 0; /* verbose |& interactive */
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char flg_no_empty = 0;
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while ((a = getopt(argc, argv, "prt")) > 0) {
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switch(a) {
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case 'p':
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flg_vi |= 3;
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break;
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case 't':
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flg_vi |= 1;
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break;
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case 'r':
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flg_no_empty = 1;
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break;
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default:
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bb_show_usage();
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}
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}
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a = argc - optind;
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argv += optind;
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if(a==0) {
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/* default behavior is to echo all the filenames */
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*argv = "/bin/echo";
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a++;
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}
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/* allocating pointers for execvp: a*arg, arg from stdin, NULL */
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args = xcalloc(a + 3, sizeof(char *));
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/* Store the command to be executed (taken from the command line) */
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for (i = 0; i < a; i++)
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args[i] = *argv++;
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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 = bb_get_chomped_line_from_file(stdin)) != NULL) {
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if(file_to_act_on[0] != 0 || flg_no_empty == 0) {
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args[a] = file_to_act_on[0] ? file_to_act_on : NULL;
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if(flg_vi) {
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for(i=0; args[i]; i++) {
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if(i)
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fputc(' ', stderr);
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fputs(args[i], stderr);
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}
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fprintf(stderr, "%s", ((flg_vi & 2) ? " ?..." : "\n"));
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}
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if((flg_vi & 2) == 0 || bb_ask_confirmation() != 0 ) {
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xargs_exec(args);
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}
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}
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/* clean up */
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free(file_to_act_on);
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}
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#ifdef CONFIG_FEATURE_CLEAN_UP
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free(args);
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#endif
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return 0;
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}
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