[ox/mc] Add writer fieldString function

(synced from 395e262e3e)

src/ox/mc/write.cpp

@@ -90,6 +90,10 @@ Error MetalClawWriter::field(const char*, SerStr val) noexcept {
 	return OxError(0);
 }
 
+Error MetalClawWriter::fieldCString(const char *name, char **val, int len) noexcept {
+	return field(name, SerStr(val, len));
+}
+
 std::size_t MetalClawWriter::size() const noexcept {
 	return m_buffIt;
 }

src/ox/mc/write.hpp

@@ -68,6 +68,8 @@ class MetalClawWriter {
 
 		Error field(const char*, SerStr val) noexcept;
 
+		Error fieldCString(const char *name, char **val, int len) noexcept;
+
 		template<typename T>
 		Error field(const char*, T *val) noexcept;
 

src/ox/oc/write.hpp

@@ -63,6 +63,8 @@ class OrganicClawWriter {
 
 		Error field(const char*, SerStr val) noexcept;
 
+		Error fieldCString(const char *name, char **val, int len) noexcept;
+
 		template<typename T>
 		Error field(const char*, T *val) noexcept;