-/* vi: set sw=4 ts=4: */
/*
* Mini xargs implementation for busybox
*
- * Copyright (C) 2000 by Lineo, inc.
+ * Copyright (C) 1999,2000,2001 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * Remixed by Mark Whitley <markw@lineo.com>, <markw@codepoet.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
*
*/
-#include "internal.h"
-#include <stdlib.h>
+#include "busybox.h"
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
-#include <errno.h>
-#include <getopt.h>
-#include <ctype.h>
-
int xargs_main(int argc, char **argv)
{
- char *in_from_stdin = NULL;
- char *args_from_cmdline = NULL;
char *cmd_to_be_executed = NULL;
- char traceflag = 0;
- int len_args_from_cmdline, len_cmd_to_be_executed, len, opt;
-
- /* 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 and arguments to be executed (from the command line) */
+ char *file_to_act_on = NULL;
+
+ /*
+ * 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.
+ */
+
+ /* Store the command to be executed (taken from the command line) */
if (argc == 1) {
- len_args_from_cmdline = 6;
- args_from_cmdline = xmalloc(len_args_from_cmdline);
- strcat(args_from_cmdline, "echo ");
+ /* default behavior is to echo all the filenames */
+ cmd_to_be_executed = strdup("/bin/echo ");
} else {
- opt=strlen(*argv);
- len_args_from_cmdline = (opt > 10)? opt : 10;
- args_from_cmdline = xcalloc(len_args_from_cmdline, sizeof(char));
- while (argc-- > 0) {
- if (strlen(*argv) + strlen(args_from_cmdline) >
- len_args_from_cmdline) {
- len_args_from_cmdline += strlen(*argv);
- args_from_cmdline =
- xrealloc(args_from_cmdline,
- len_args_from_cmdline+1);
- }
- strcat(args_from_cmdline, *argv);
- strcat(args_from_cmdline, " ");
+ /* concatenate all the arguments passed to xargs together */
+ int i;
+ int len = 1; /* for the '\0' */
+ for (i = 1; i < argc; i++) {
+ len += strlen(argv[i]);
+ len += 1; /* for the space between the args */
+ cmd_to_be_executed = xrealloc(cmd_to_be_executed, len);
+ strcat(cmd_to_be_executed, argv[i]);
+ strcat(cmd_to_be_executed, " ");
}
}
- /* Set up some space for the command to be executed to be held in */
- len_cmd_to_be_executed=10;
- cmd_to_be_executed = xcalloc(len_cmd_to_be_executed, sizeof(char));
- strcpy(cmd_to_be_executed, args_from_cmdline);
- strcat(cmd_to_be_executed, " \"");
-
- /* Now, read in one line at a time from stdin, and run command+args on it */
- in_from_stdin = get_line_from_file(stdin);
- for (;in_from_stdin!=NULL;) {
- char *tmp;
- opt = strlen(in_from_stdin);
- len = opt + len_args_from_cmdline;
- len_cmd_to_be_executed+=len+3;
- cmd_to_be_executed=xrealloc(cmd_to_be_executed, len_cmd_to_be_executed);
-
- /* 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));
+ /* 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 = NULL;
+ char *output_line = NULL;
+ char *execstr = NULL;
+
+ /* eat the newline off the filename. */
+ chomp(file_to_act_on);
+
+ /* eat blank lines */
+ if (strlen(file_to_act_on) == 0)
+ continue;
+
+ /* assemble the command and execute it */
+ execstr = xcalloc(strlen(cmd_to_be_executed) +
+ strlen(file_to_act_on) + 1, sizeof(char));
+ strcat(execstr, cmd_to_be_executed);
+ strcat(execstr, 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);
}
- /* 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(cmd_to_be_executed, tmp);
- strcat(cmd_to_be_executed, " ");
-
- free(in_from_stdin);
- in_from_stdin = get_line_from_file(stdin);
+ /* clean up */
+ pclose(cmd_output);
+ free(execstr);
+ free(file_to_act_on);
}
- strcat(cmd_to_be_executed, "\"");
- if (traceflag==1)
- fputs(cmd_to_be_executed, stderr);
-
- if ((system(cmd_to_be_executed) != 0) && (errno != 0))
- fatalError("%s", strerror(errno));
-
-
#ifdef BB_FEATURE_CLEAN_UP
- free(args_from_cmdline);
free(cmd_to_be_executed);
#endif
return 0;
}
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+/* vi: set sw=4 ts=4: */
projects / oweals / busybox.git / blobdiff