--- Libc/Libc-763.13/stdio/FreeBSD/setbuf.3
+++ Libc/Libc-1353.41.1/stdio/FreeBSD/setbuf.3
@@ -46,40 +46,73 @@
 .Sh SYNOPSIS
 .In stdio.h
 .Ft void
-.Fn setbuf "FILE * restrict stream" "char * restrict buf"
+.Fo setbuf
+.Fa "FILE *restrict stream"
+.Fa "char *restrict buf"
+.Fc
 .Ft void
-.Fn setbuffer "FILE *stream" "char *buf" "int size"
+.Fo setbuffer
+.Fa "FILE *stream"
+.Fa "char *buf"
+.Fa "int size"
+.Fc
 .Ft int
-.Fn setlinebuf "FILE *stream"
+.Fo setlinebuf
+.Fa "FILE *stream"
+.Fc
 .Ft int
-.Fn setvbuf "FILE * restrict stream" "char * restrict buf" "int mode" "size_t size"
+.Fo setvbuf
+.Fa "FILE *restrict stream"
+.Fa "char *restrict buf"
+.Fa "int type"
+.Fa "size_t size"
+.Fc
 .Sh DESCRIPTION
-The three types of buffering available are unbuffered, block buffered,
-and line buffered.
+Three types of buffering are available:
+unbuffered, block buffered, and line buffered.
 When an output stream is unbuffered, information appears on the
 destination file or terminal as soon as written;
-when it is block buffered many characters are saved up and written as a block;
-when it is line buffered characters are saved up until a newline is
-output or input is read from any stream attached to a terminal device
+when it is block buffered,
+many characters are saved up and written as a block;
+when it is line buffered,
+characters are saved up until a newline is output
+or input is read from any stream attached to a terminal device
 (typically
 .Dv stdin ) .
+.Pp
+The default buffer settings can be overwritten for stdout
+.Dv ( STDBUF1 )
+or for all descriptors
+.Dv ( STDBUF ) .
+The environment variable value is a letter followed by an optional numeric
+value indicating the size of the buffer.
+Valid sizes range from 0B to 64KB.
+Valid letters are:
+.Bl -tag -width X -indent
+.It Dv Li U
+Unbuffered.
+.It Dv Li L
+Line-buffered.
+.It Dv Li F
+Fully-buffered.
+.El
+.Pp
 The function
 .Xr fflush 3
 may be used to force the block out early.
 (See
 .Xr fclose 3 . )
 .Pp
-Normally all files are block buffered.
+Normally, all files are block buffered.
 When the first
 .Tn I/O
 operation occurs on a file,
 .Xr malloc 3
-is called,
-and an optimally-sized buffer is obtained.
+is called and an optimally-sized buffer is obtained.
 If a stream refers to a terminal
 (as
 .Dv stdout
-normally does) it is line buffered.
+normally does), it is line buffered.
 The standard error stream
 .Dv stderr
 is always unbuffered.
@@ -89,7 +122,7 @@
 function
 may be used to alter the buffering behavior of a stream.
 The
-.Fa mode
+.Fa type
 argument must be one of the following three macros:
 .Bl -tag -width _IOFBF -offset indent
 .It Dv _IONBF