/*
* Mini xargs implementation for busybox
+ * Only "-prt" options are supported in this version of xargs.
*
- * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
- * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
- * Remixed by Mark Whitley <markw@codepoet.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 <stdio.h>
#include <stdlib.h>
-#include <string.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
#include "busybox.h"
+
+/*
+ This function have special algorithm.
+ Don`t use fork and include to main!
+*/
+static void xargs_exec(char * const * args)
+{
+ 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");
+ }
+}
+
int xargs_main(int argc, char **argv)
{
- char *cmd_to_be_executed;
char *file_to_act_on;
- int i;
- int len;
+ char **args;
+ int i, a;
+ char flg_vi; /* verbose |& interactive */
+ char flg_no_empty;
- /*
- * No options are supported in this version of xargs; no getopt.
- *
- * Re: The missing -t flag: Most programs that produce output also print
- * the filename, so xargs doesn't really need to do it again. Supporting
- * the -t flag =greatly= bloats up the size of this app and the memory it
- * uses because you have to buffer all the input file strings in memory. If
- * you really want to see the filenames that xargs will act on, just run it
- * once with no args and xargs will echo the filename. Simple.
- */
+ bb_opt_complementaly = "pt";
+ a = bb_getopt_ulflags(argc, argv, "tpr");
+ flg_vi = a & 3;
+ flg_no_empty = a & 4;
- argv++;
- len = argc; /* arg = count for ' ' + trailing '\0' */
- /* Store the command to be executed (taken from the command line) */
- if (argc == 1) {
+ a = argc - optind;
+ argv += optind;
+ if(a==0) {
/* default behavior is to echo all the filenames */
- argv[0] = "/bin/echo";
- len++; /* space for trailing '\0' */
- } else {
- argc--;
- }
- /* concatenate all the arguments passed to xargs together */
- for (i = 0; i < argc; i++)
- len += strlen(argv[i]);
- cmd_to_be_executed = xmalloc (len);
- for (i = len = 0; i < argc; i++) {
- len = sprintf(cmd_to_be_executed + len, "%s ", argv[i]);
+ *argv = "/bin/echo";
+ a++;
}
+ /* allocating pointers for execvp: a*arg, arg from stdin, NULL */
+ args = xcalloc(a + 3, sizeof(char *));
+
+ /* 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 */
- while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) {
-
- FILE *cmd_output;
- char *output_line;
- char *execstr;
-
- /* eat the newline off the filename. */
- chomp(file_to_act_on);
-
- /* eat blank lines */
- if (file_to_act_on[0] == 0)
- continue;
-
- /* assemble the command and execute it */
- bb_asprintf(&execstr, "%s%s", cmd_to_be_executed, file_to_act_on);
-
- cmd_output = popen(execstr, "r");
- if (cmd_output == NULL)
- perror_msg_and_die("popen");
-
- /* harvest the output */
- while ((output_line = get_line_from_file(cmd_output)) != NULL) {
- fputs(output_line, stdout);
- free(output_line);
+ 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);
+ }
}
-
/* clean up */
- pclose(cmd_output);
- free(execstr);
free(file_to_act_on);
}
-
#ifdef CONFIG_FEATURE_CLEAN_UP
- free(cmd_to_be_executed);
+ free(args);
#endif
-
return 0;
}
-
-/* vi: set sw=4 ts=4: */
projects / oweals / busybox.git / blobdiff