Added bitstring-bits-used-set API to use in audit-log status bits (#879)

src/bacnet/bacstr.c

@@ -116,6 +116,24 @@ uint8_t bitstring_bits_used(const BACNET_BIT_STRING *bit_string)
     return (bit_string ? bit_string->bits_used : 0);
 }
 
+/**
+ * @brief Write the amount of bits used in the bit string structure.
+ * @param bit_string  Pointer to the bit string structure.
+ * @param bits_used Number of bits in this bitstring
+ * @return true on success or false on error.
+ */
+bool bitstring_bits_used_set(BACNET_BIT_STRING *bit_string, uint8_t bits_used)
+{
+    bool status = false;
+
+    if (bit_string) {
+        bit_string->bits_used = bits_used;
+        status = true;
+    }
+
+    return status;
+}
+
 /**
  * Returns the number of bytes that a bit string is using.
  *

src/bacnet/bacstr.h

@@ -45,6 +45,8 @@ BACNET_STACK_EXPORT
 bool bitstring_bit(const BACNET_BIT_STRING *bit_string, uint8_t bit_number);
 BACNET_STACK_EXPORT
 uint8_t bitstring_bits_used(const BACNET_BIT_STRING *bit_string);
+BACNET_STACK_EXPORT
+bool bitstring_bits_used_set(BACNET_BIT_STRING *bit_string, uint8_t bits_used);
 /* returns the number of bytes that a bit string is using */
 BACNET_STACK_EXPORT
 uint8_t bitstring_bytes_used(const BACNET_BIT_STRING *bit_string);