Index: head/lib/libc/stdlib/reallocarray.3
===================================================================
--- head/lib/libc/stdlib/reallocarray.3	(revision 282471)
+++ head/lib/libc/stdlib/reallocarray.3	(revision 282472)
@@ -1,137 +1,142 @@
-.\"
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 .\" Processing Systems.
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 .Dd May 1, 2015
 .Dt REALLOCARRAY 3
 .Os
 .Sh NAME
 .Nm reallocarray
 .Nd memory reallocation function
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In stdlib.h
 .Ft void *
 .Fn reallocarray "void *ptr" "size_t nmemb" "size_t size"
 .Sh DESCRIPTION
 The
 .Fn reallocarray
+function is similar to the
+.Fn realloc
+function
 except it operates on
 .Fa nmemb
 members of size
 .Fa size
 and checks for integer overflow in the calculation
 .Fa nmemb
 *
 .Fa size .
 .Sh RETURN VALUES
+The
 .Fn reallocarray
-return a pointer to the allocated space; otherwise, a
+function returns a pointer to the allocated space; otherwise, a
 .Dv NULL
 pointer is returned and
 .Va errno
 is set to
 .Er ENOMEM .
 .Sh EXAMPLES
 Consider
 .Fn reallocarray
 when there is multiplication in the
 .Fa size
 argument of
 .Fn malloc
 or
 .Fn realloc .
 For example, avoid this common idiom as it may lead to integer overflow:
 .Bd -literal -offset indent
 if ((p = malloc(num * size)) == NULL)
 	err(1, "malloc");
 .Ed
 .Pp
 A drop-in replacement is the
 .Ox
 extension
 .Fn reallocarray :
 .Bd -literal -offset indent
 if ((p = reallocarray(NULL, num, size)) == NULL)
 	err(1, "reallocarray");
 .Ed
 .Pp
 When using
 .Fn realloc ,
 be careful to avoid the following idiom:
 .Bd -literal -offset indent
 size += 50;
 if ((p = realloc(p, size)) == NULL)
 	return (NULL);
 .Ed
 .Pp
 Do not adjust the variable describing how much memory has been allocated
 until the allocation has been successful.
 This can cause aberrant program behavior if the incorrect size value is used.
 In most cases, the above sample will also result in a leak of memory.
 As stated earlier, a return value of
 .Dv NULL
 indicates that the old object still remains allocated.
 Better code looks like this:
 .Bd -literal -offset indent
 newsize = size + 50;
 if ((newp = realloc(p, newsize)) == NULL) {
 	free(p);
 	p = NULL;
 	size = 0;
 	return (NULL);
 }
 p = newp;
 size = newsize;
 .Ed
 .Pp
 As with
 .Fn malloc ,
 it is important to ensure the new size value will not overflow;
 i.e. avoid allocations like the following:
 .Bd -literal -offset indent
 if ((newp = realloc(p, num * size)) == NULL) {
 	...
 .Ed
 .Pp
 Instead, use
 .Fn reallocarray :
 .Bd -literal -offset indent
 if ((newp = reallocarray(p, num, size)) == NULL) {
 	...
 .Ed
 .Sh SEE ALSO
 .Xr realloc 3
 .Sh HISTORY
 The
-.Fn reallocf
+.Fn reallocarray
 function first appeared in
-.Ox 5.6 .
+.Ox 5.6
+and
+.Fx 11.0 .