- Add the 'restrict' qualifier to the function definitions and

public prototypes of setbuf(3) and setvbuf(3) using the
   '__restrict' macro from <sys/cdefs.h> to be compliant with
   IEEE Std 1003.1-2001.
 - Replace the K&R with ANSI-C function definitions.
 - Bring the manual page up-to-date.

include/stdio.h

@@ -243,8 +243,8 @@ int	 remove(const char *);
 int	 rename(const char *, const char *);
 void	 rewind(FILE *);
 int	 scanf(const char *, ...);
-void	 setbuf(FILE *, char *);
-int	 setvbuf(FILE *, char *, int, size_t);
+void	 setbuf(FILE *__restrict, char *__restrict);
+int	 setvbuf(FILE *__restrict, char *__restrict, int, size_t);
 int	 sprintf(char *, const char *, ...);
 int	 sscanf(const char *, const char *, ...);
 FILE	*tmpfile(void);

lib/libc/stdio/setbuf.3

@@ -50,13 +50,13 @@
 .Sh SYNOPSIS
 .In stdio.h
 .Ft void
-.Fn setbuf "FILE *stream" "char *buf"
+.Fn setbuf "FILE *restrict stream" "char *restrict buf"
 .Ft void
 .Fn setbuffer "FILE *stream" "char *buf" "int size"
 .Ft int
 .Fn setlinebuf "FILE *stream"
 .Ft int
-.Fn setvbuf "FILE *stream" "char *buf" "int mode" "size_t size"
+.Fn setvbuf "FILE *restrict stream" "char *restrict buf" "int mode" "size_t size"
 .Sh DESCRIPTION
 The three types of buffering available are unbuffered, block buffered,
 and line buffered.

lib/libc/stdio/setbuf.c

@@ -44,9 +44,7 @@ __FBSDID("$FreeBSD$");
 #include "local.h"
 
 void
-setbuf(fp, buf)
-	FILE *fp;
-	char *buf;
+setbuf(FILE *__restrict fp, char *__restrict buf)
 {
 	(void) setvbuf(fp, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
 }

lib/libc/stdio/setvbuf.c

@@ -52,11 +52,7 @@ __FBSDID("$FreeBSD$");
  * a buffer.
  */
 int
-setvbuf(fp, buf, mode, size)
-	FILE *fp;
-	char *buf;
-	int mode;
-	size_t size;
+setvbuf(FILE *__restrict fp, char *__restrict buf, int mode, size_t size)
 {
 	int ret, flags;
 	size_t iosize;