[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>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/core/parseopt.c b/src/core/parseopt.c
index 38b1f29f..51450835 100644
--- a/src/core/parseopt.c
+++ b/src/core/parseopt.c
@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <ipxe/menu.h>
 #include <ipxe/settings.h>
 #include <ipxe/params.h>
+#include <ipxe/timer.h>
 #include <ipxe/parseopt.h>
 
 /** @file
@@ -96,6 +97,27 @@ int parse_integer ( char *text, unsigned int *value ) {
 }
 
 /**
+ * Parse timeout value (in ms)
+ *
+ * @v text		Text
+ * @ret value		Integer value
+ * @ret rc		Return status code
+ */
+int parse_timeout ( char *text, unsigned long *value ) {
+	unsigned int value_ms;
+	int rc;
+
+	/* Parse raw integer value */
+	if ( ( rc = parse_integer ( text, &value_ms ) ) != 0 )
+		return rc;
+
+	/* Convert to a number of timer ticks */
+	*value = ( ( value_ms * TICKS_PER_SEC ) / 1000 );
+
+	return 0;
+}
+
+/**
  * Parse network device name
  *
  * @v text		Text