-/* vi: set sw=4 ts=4: */
/*
* Mini xargs implementation for busybox
+ * Only "-prt" options are supported in this version of xargs.
*
- * Copyright (C) 2000 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
+ *
+ * Special thanks Mark Whitley for stimul to rewrote :)
*
* 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
*
*/
-#include "busybox.h"
-#include <stdlib.h>
#include <stdio.h>
-#include <string.h>
-#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
#include <getopt.h>
-#include <ctype.h>
+#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
+#include "busybox.h"
-int xargs_main(int argc, char **argv)
+/*
+ This function have special algorithm.
+ Don`t use fork and include to main!
+*/
+static void xargs_exec(char * const * args)
{
- char *in_from_stdin = NULL;
- char *args = NULL;
- char *cmd_to_be_executed = NULL;
- char traceflag = 0;
- int len_args=2, 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);
+ int p;
+ int common[4]; /* shared vfork stack */
+
+ common[0] = 0;
+ if ((p = vfork()) >= 0) {
+ if (p == 0) {
+ /* vfork -- child */
+ execvp(args[0], args);
+ common[0] = errno; /* set error to shared stack */
+ _exit(1);
+ } else {
+ /* vfork -- parent */
+ wait(NULL);
+ if(common[0]) {
+ errno = common[0];
+ bb_perror_msg_and_die("%s", args[0]);
}
}
+ } else {
+ bb_perror_msg_and_die("vfork");
}
+}
- /* 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);
+int xargs_main(int argc, char **argv)
+{
+ char *file_to_act_on;
+ char **args;
+ int i, a;
+ char flg_vi; /* verbose |& interactive */
+ char flg_no_empty;
+
+ bb_opt_complementaly = "pt";
+ a = bb_getopt_ulflags(argc, argv, "tpr");
+ flg_vi = a & 3;
+ flg_no_empty = a & 4;
+
+ a = argc - optind;
+ argv += optind;
+ if(a==0) {
+ /* default behavior is to echo all the filenames */
+ *argv = "/bin/echo";
+ a++;
}
+ /* allocating pointers for execvp: a*arg, arg from stdin, NULL */
+ args = xcalloc(a + 3, sizeof(char *));
- args=xrealloc(args, len_args);
- strcpy(args, " ");
+ /* Store the command to be executed (taken from the command line) */
+ for (i = 0; i < a; i++)
+ args[i] = *argv++;
/* Now, read in one line at a time from stdin, and store this
* line to be used later as an argument to the command */
- 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) {
- fprintf(stderr, "%s%s\n", cmd_to_be_executed, args);
- }
-
- 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;
+ while ((file_to_act_on = bb_get_chomped_line_from_file(stdin)) != NULL) {
+ if(file_to_act_on[0] != 0 || flg_no_empty == 0) {
+ args[a] = file_to_act_on[0] ? file_to_act_on : NULL;
+ if(flg_vi) {
+ for(i=0; args[i]; i++) {
+ if(i)
+ fputc(' ', stderr);
+ fputs(args[i], stderr);
+ }
+ fputs(((flg_vi & 2) ? " ?..." : "\n"), stderr);
+ }
+ if((flg_vi & 2) == 0 || bb_ask_confirmation() != 0 ) {
+ xargs_exec(args);
+ }
}
- //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));
+ /* clean up */
+ free(file_to_act_on);
}
- /* Wait for a child process to exit */
- wpid = wait(&status);
-
-
-#ifdef BB_FEATURE_CLEAN_UP
+#ifdef CONFIG_FEATURE_CLEAN_UP
free(args);
- free(cmd_to_be_executed);
#endif
-
- if (wpid > 0)
- return (WEXITSTATUS(status));
- else
- return EXIT_FAILURE;
+ return 0;
}
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff