[parseopt] Add parse_timeout()

Parsing a timeout value (specified in milliseconds) into an internal
timeout value measured in timer ticks is a common operation.  Provide
a parse_timeout() value to carry out this conversion automatically.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/usr/pingmgmt.c

@@ -56,16 +56,15 @@ static void ping_callback ( struct sockaddr *peer, unsigned int sequence,
  * Ping a host
  *
  * @v hostname		Hostname
- * @v timeout_ms	Timeout between pings, in ms
+ * @v timeout		Timeout between pings, in ticks
  * @v len		Payload length
  * @ret rc		Return status code
  */
-int ping ( const char *hostname, unsigned long timeout_ms, size_t len ) {
+int ping ( const char *hostname, unsigned long timeout, size_t len ) {
 	int rc;
 
 	/* Create pinger */
-	if ( ( rc = create_pinger ( &monojob, hostname,
-				    ( ( timeout_ms * TICKS_PER_SEC ) / 1000 ),
+	if ( ( rc = create_pinger ( &monojob, hostname, timeout,
 				    len, ping_callback ) ) != 0 ) {
 		printf ( "Could not start ping: %s\n", strerror ( rc ) );
 		return rc;

src/usr/prompt.c

@@ -28,28 +28,27 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <errno.h>
 #include <stdio.h>
 #include <ipxe/console.h>
-#include <ipxe/timer.h>
 #include <usr/prompt.h>
 
 /**
  * Prompt for keypress
  *
  * @v text		Prompt string
- * @v wait_ms		Time to wait, in milliseconds (0=indefinite)
+ * @v timeout		Timeout period, in ticks (0=indefinite)
  * @v key		Key to wait for (0=any key)
  * @ret rc		Return status code
  *
  * Returns success if the specified key was pressed within the
  * specified timeout period.
  */
-int prompt ( const char *text, unsigned int wait_ms, int key ) {
+int prompt ( const char *text, unsigned long timeout, int key ) {
 	int key_pressed;
 
 	/* Display prompt */
 	printf ( "%s", text );
 
 	/* Wait for key */
-	key_pressed = getkey ( ( wait_ms * TICKS_PER_SEC ) / 1000 );
+	key_pressed = getkey ( timeout );
 
 	/* Clear the prompt line */
 	while ( *(text++) )