+/* vi: set sw=4 ts=4: */
/*
- * Mini Cat implementation for busybox
+ * cat implementation for busybox
*
- * Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
+ * Copyright (C) 2003 Manuel Novoa III <mjn3@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 <stdio.h>
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
+
+/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
+ *
+ * This is a new implementation of 'cat' which aims to be SUSv3 compliant.
+ *
+ * Changes from the previous implementation include:
+ * 1) Multiple '-' args are accepted as required by SUSv3. The previous
+ * implementation would close stdin and segfault on a subsequent '-'.
+ * 2) The '-u' options is required by SUSv3. Note that the specified
+ * behavior for '-u' is done by default, so all we need do is accept
+ * the option.
+ */
-const char cat_usage[] = "[file ...]";
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "busybox.h"
-extern int cat_more_main(int argc, char **argv)
+int cat_main(int argc, char **argv)
{
- int c;
- FILE *file = stdin;
-
- if ( (argc < 2) || (**(argv+1) == '-') ) {
- fprintf(stderr, "Usage: %s %s", *argv, cat_usage);
- exit(FALSE);
- }
- argc--;
- argv++;
-
- while (argc-- > 0) {
- file = fopen(*argv, "r");
- if (file == NULL) {
- perror(*argv);
- exit(FALSE);
+ FILE *f;
+ int retval = EXIT_SUCCESS;
+
+ bb_getopt_ulflags(argc, argv, "u");
+
+ argv += optind;
+ if (!*argv) {
+ *--argv = "-";
}
- while ((c = getc(file)) != EOF)
- putc(c, stdout);
- fclose(file);
- fflush(stdout);
-
- argc--;
- argv++;
- }
- exit(TRUE);
+
+ do {
+ if ((f = bb_wfopen_input(*argv)) != NULL) {
+ int r = bb_copyfd_eof(fileno(f), STDOUT_FILENO);
+ bb_fclose_nonstdin(f);
+ if (r >= 0) {
+ continue;
+ }
+ }
+ retval = EXIT_FAILURE;
+ } while (*++argv);
+
+ return retval;
}