- Add the 'restrict' qualifier to the function definition of

strftime(3) for IEEE Std 1003.1-2001 compliance and remove
   excessive usage of the 'const' qualifier that was neither
   present in the prototype in the publice header, nor in the
   local prototype just above the function definition.
 - Replace the K&R function definition with a ANSI-C one.
 - Update the prototype of strftime(3) in its manual page.

include/time.h

@@ -121,7 +121,8 @@ double difftime(time_t, time_t);
 struct tm *gmtime(const time_t *);
 struct tm *localtime(const time_t *);
 time_t mktime(struct tm *);
-size_t strftime(char *, size_t, const char *, const struct tm *);
+size_t strftime(char *__restrict, size_t, const char *__restrict,
+    const struct tm *__restrict);
 time_t time(time_t *);
 
 #if __POSIX_VISIBLE

lib/libc/stdtime/strftime.3

@@ -47,7 +47,7 @@
 .Sh SYNOPSIS
 .In time.h
 .Ft size_t
-.Fn strftime "char *buf" "size_t maxsize" "const char *format" "const struct tm *timeptr"
+.Fn strftime "char *restrict buf" "size_t maxsize" "const char *restrict format" "const struct tm *restrict timeptr"
 .Sh DESCRIPTION
 The
 .Fn strftime

lib/libc/stdtime/strftime.c

@@ -44,16 +44,14 @@ static char *	_add(const char *, char *, const char *);
 static char *	_conv(int, const char *, char *, const char *);
 static char *	_fmt(const char *, const struct tm *, char *, const char *);
 
-size_t strftime(char *, size_t, const char *, const struct tm *);
+size_t strftime(char *__restrict, size_t, const char *__restrict,
+    const struct tm *__restrict);
 
 extern char *	tzname[];
 
 size_t
-strftime(s, maxsize, format, t)
-	char *const s;
-	const size_t maxsize;
-	const char *const format;
-	const struct tm *const t;
+strftime(char *__restrict s, size_t maxsize, const char *__restrict format,
+    const struct tm *__restrict t)
 {
 	char *p;