1 files changed, 106 insertions, 0 deletions
diff --git a/release/src/router/busybox/coreutils/tac.c b/release/src/router/busybox/coreutils/tac.c
new file mode 100644
index 00000000..d70e23ad
--- /dev/null
+++ b/release/src/router/busybox/coreutils/tac.c
@@ -0,0 +1,106 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * tac implementation for busybox
+ *
+ * Copyright (C) 2003  Yang Xiaopeng  <yxp at hanwang.com.cn>
+ * Copyright (C) 2007  Natanael Copa  <natanael.copa@gmail.com>
+ * Copyright (C) 2007  Tito Ragusa    <farmatito@tiscali.it>
+ *
+ * Licensed under GPLv2, see file License in this tarball for details.
+ *
+ */
+
+/* tac - concatenate and print files in reverse */
+
+/* Based on Yang Xiaopeng's (yxp at hanwang.com.cn) patch
+ * http://www.uclibc.org/lists/busybox/2003-July/008813.html
+ */
+
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
+struct lstring {
+	int size;
+	char buf[1];
+};
+
+int tac_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int tac_main(int argc UNUSED_PARAM, char **argv)
+{
+	char **name;
+	FILE *f;
+	struct lstring *line = NULL;
+	llist_t *list = NULL;
+	int retval = EXIT_SUCCESS;
+
+#if ENABLE_DESKTOP
+/* tac from coreutils 6.9 supports:
+       -b, --before
+              attach the separator before instead of after
+       -r, --regex
+              interpret the separator as a regular expression
+       -s, --separator=STRING
+              use STRING as the separator instead of newline
+We support none, but at least we will complain or handle "--":
+*/
+	getopt32(argv, "");
+	argv += optind;
+#else
+	argv++;
+#endif
+	if (!*argv)
+		*--argv = (char *)"-";
+	/* We will read from last file to first */
+	name = argv;
+	while (*name)
+		name++;
+
+	do {
+		int ch, i;
+
+		name--;
+		f = fopen_or_warn_stdin(*name);
+		if (f == NULL) {
+			/* error message is printed by fopen_or_warn_stdin */
+			retval = EXIT_FAILURE;
+			continue;
+		}
+
+		errno = i = 0;
+		do {
+			ch = fgetc(f);
+			if (ch != EOF) {
+				if (!(i & 0x7f))
+					/* Grow on every 128th char */
+					line = xrealloc(line, i + 0x7f + sizeof(int) + 1);
+				line->buf[i++] = ch;
+			}
+			if (ch == '\n' || (ch == EOF && i != 0)) {
+				line = xrealloc(line, i + sizeof(int));
+				line->size = i;
+				llist_add_to(&list, line);
+				line = NULL;
+				i = 0;
+			}
+		} while (ch != EOF);
+		/* fgetc sets errno to ENOENT on EOF, we don't want
+		 * to warn on this non-error! */
+		if (errno && errno != ENOENT) {
+			bb_simple_perror_msg(*name);
+			retval = EXIT_FAILURE;
+		}
+	} while (name != argv);
+
+	while (list) {
+		line = (struct lstring *)list->data;
+		xwrite(STDOUT_FILENO, line->buf, line->size);
+		if (ENABLE_FEATURE_CLEAN_UP) {
+			free(llist_pop(&list));
+		} else {
+			list = list->link;
+		}
+	}
+
+	return retval;
+}