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-rw-r--r--Makefile1
-rw-r--r--gzoffset.336
2 files changed, 37 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index ffac1f1..14a3455 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,7 @@ MAN += gzfread.3
 MAN += gzfwrite.3
 MAN += gzgetc.3
 MAN += gzgets.3
+MAN += gzoffset.3
 MAN += gzopen.3
 MAN += gzprintf.3
 MAN += gzputc.3
diff --git a/gzoffset.3 b/gzoffset.3
new file mode 100644
index 0000000..35f0098
--- /dev/null
+++ b/gzoffset.3
@@ -0,0 +1,36 @@
+.Dd November 13, 2018
+.Dt GZOFFSET 3
+.Os
+.
+.Sh NAME
+.Nm gzoffset
+.Nd offset in compressed file
+.
+.Sh LIBRARY
+.Lb libz
+.
+.Sh SYNOPSIS
+.In zlib.h
+.Ft z_off_t
+.Fn gzoffset "gzFile file"
+.
+.Sh DESCRIPTION
+Returns the current offset
+in the file being read or written.
+This offset includes
+the count of bytes
+that precede the gzip stream,
+for example when appending
+or when using
+.Xr gzdopen 3
+for reading.
+When reading,
+the offset does not include
+as yet unused buffered input.
+This information can be used
+for a progress indicator.
+.
+.Sh RETURN VALUES
+On error,
+.Fn gzoffset
+returns -1.