1 files changed, 77 insertions, 0 deletions
diff --git a/usr.bin/tail/extern.h b/usr.bin/tail/extern.h
new file mode 100644
index 000000000000..f1d1f8c37291
--- /dev/null
+++ b/usr.bin/tail/extern.h
@@ -0,0 +1,77 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#define	WR(p, size) do { \
+	ssize_t res; \
+	res = write(STDOUT_FILENO, p, size); \
+	if (res != (ssize_t)size) { \
+		if (res == -1) \
+			oerr(); \
+		else \
+			errx(1, "stdout"); \
+	} \
+} while (0)
+
+#define TAILMAPLEN (4<<20)
+
+struct mapinfo {
+	off_t	mapoff;
+	off_t	maxoff;
+	size_t	maplen;
+	char	*start;
+	int	fd;
+};
+
+struct file_info {
+	FILE *fp;
+	const char *file_name;
+	struct stat st;
+};
+
+typedef struct file_info file_info_t;
+
+enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE };
+
+void follow(file_info_t *, enum STYLE, off_t);
+void forward(FILE *, const char *, enum STYLE, off_t, struct stat *);
+void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *);
+
+int bytes(FILE *, const char *, off_t);
+int lines(FILE *, const char *, off_t);
+
+void ierr(const char *);
+void oerr(void);
+int mapprint(struct mapinfo *, off_t, off_t);
+int maparound(struct mapinfo *, off_t);
+void printfn(const char *, int);
+
+extern int Fflag, fflag, qflag, rflag, rval, no_files, vflag;
+extern fileargs_t *fa;