getopt.rs(3): makes optind part of the Opt struct

src/getopt.rs

@@ -32,30 +32,9 @@ extern "C" {
 	) -> c_int;
 }
 
-/* From getopt(3p):
- *
- * The variable optind is the index of the next element of the argv[]
- * vector to be processed. It shall be initialized to 1 by the system, and
- * getopt() shall update it when it finishes with each element of argv[].
- * If the application sets optind to zero before calling getopt(), the 
- * behavior is unspecified. When an element of argv[] contains multiple
- * option characters, it is unspecified how getopt() determines which
- * options have already been processed.
- *
- * This API can be utilized using unsafe blocks and dereferencing:
- *
- * use getopt::OPTIND;
- *
- * unsafe { while *OPTIND < 5 {
- *	println!("{}", *OPTIND); // 1..4
- *	*OPTIND += 1;
- * }}
- */
-pub static mut OPTIND: *mut i32 = unsafe { std::ptr::addr_of_mut!(optind) };
-
 pub struct Opt {
 	pub arg: Option<String>,
-	pub ind: i32,
+	pub ind: *mut i32,
 	pub opt: String,
 }
 
@@ -130,7 +109,22 @@ impl GetOpt for Vec<String> {
 
 					Some(Ok(Opt {
 						arg: Some(arg), /* opt argument */
-						ind: optind, /* opt index */
+						/* From getopt(3p):
+						 *
+						 * The variable optind is the index of the next element
+						 * of the argv[] vector to be processed. It shall be
+						 * initialized to 1 by the system, and getopt() shall
+						 * update it when it finishes with each element of
+						 * argv[]. If the application sets optind to zero 
+						 * before calling getopt(), the behavior is unspecified.
+						 * When an element of argv[] contains multiple option
+						 * characters, it is unspecified how getopt()
+						 * determines which options have already been processed.
+						 *
+						 * This API is unsafe and can be utilized by
+						 * dereferencing the ind field before reading to and
+						 * writing from the optind memory. */
+						ind: std::ptr::addr_of_mut!(optind),
 						opt: opt.to_string(), /* option itself */
 					}))
 				},