Diff: CmdLine.cpp

Revision:

4:700b71cd3bd2

Parent:

3:cf3de26aa444

Child:

5:1a14de1c4d7b

--- a/CmdLine.cpp	Thu Jun 20 22:25:39 2019 +0000
+++ b/CmdLine.cpp	Tue Jul 16 10:24:18 2019 +0000
@@ -403,6 +403,41 @@
     return false; // no match
 }
 
+/** CmdLine::parse_interval_usec matches "key"=digits
+ *
+ * @return true if keyword was found in buffer
+ * @param[in] key string value to match
+ * @param[out] interval_usec updated from value string if match "key"=value,
+ * optional suffix Hz kHz or MHz 1/x inverts and scales the value
+ * optional suffix s or ms or msec or us or usec scales the value
+ *
+ * @post on successful match, the key=value substring is deleted from cmdbuf
+ *
+ */
+bool CmdLine::parse_interval_usec(const char *key, us_timestamp_t& interval_usec)
+{
+    char valueBuf[32];
+    // bool parse_and_remove_key(const char *key, char *valueBuf, int valueBufLen);
+    if (parse_and_remove_key(key, valueBuf, sizeof(valueBuf)))
+    {
+        // ASSERT: buf[matched_index] contains '=' followed by value
+        interval_usec = strtoul(valueBuf, NULL, 10);
+        if (strstr(valueBuf, "ms")) {
+            interval_usec = interval_usec * 1000;
+        } else if (strstr(valueBuf, "s")) {
+            interval_usec = interval_usec * 1000000;
+        } else if (strstr(valueBuf, "MHz")) {
+            interval_usec = 1. / interval_usec;
+        } else if (strstr(valueBuf, "kHz")) {
+            interval_usec = 1000. / interval_usec;
+        } else if (strstr(valueBuf, "Hz")) {
+            interval_usec = 1000000. / interval_usec;
+        }
+        return true;
+    }
+    return false; // no match
+}
+
 /** CmdLine::parse_flag matches "key"=0 or 1
  *
  * @return true if keyword was found in buffer