add back string conversion functions. (#68)

strconvfuncs.go

@@ -0,0 +1,54 @@
+package gmsk
+
+// #include <mosek.h>
+import "C"
+
+import "unsafe"
+
+// MSKWchar is the char type of mosek's wide chars, or MSKwchart
+type MSKWchar C.MSKwchart
+
+// Utf8towchar is wrapping [MSK_utf8towchar]
+//
+// [MSK_utf8towchar]: https://docs.mosek.com/latest/capi/alphabetic-functionalities.html#mosek.env.utf8towchar
+func Utf8towchar(
+	outputlen uint64,
+	len []uint64,
+	conv []uint64,
+	output []MSKWchar,
+	input string,
+) error {
+	c_input := C.CString(input)
+	defer C.free(unsafe.Pointer(c_input))
+
+	return ResCode(
+		C.MSK_utf8towchar(
+			C.size_t(outputlen),
+			(*C.size_t)(getPtrToFirst(len)),
+			(*C.size_t)(getPtrToFirst(conv)),
+			(*C.MSKwchart)(getPtrToFirst(output)),
+			c_input,
+		),
+	).ToError()
+}
+
+// Wchartoutf8 is wrapping [MSK_wchartoutf8]
+//
+// [MSK_wchartoutf8]: https://docs.mosek.com/latest/capi/alphabetic-functionalities.html#mosek.env.wchartoutf8
+func Wchartoutf8(
+	outputlen uint64,
+	len []uint64,
+	conv []uint64,
+	output *byte,
+	input []MSKWchar,
+) error {
+	return ResCode(
+		C.MSK_wchartoutf8(
+			C.size_t(outputlen),
+			(*C.size_t)(getPtrToFirst(len)),
+			(*C.size_t)(getPtrToFirst(conv)),
+			(*C.char)(unsafe.Pointer(output)),
+			(*C.MSKwchart)(getPtrToFirst(input)),
+		),
+	).ToError()
+}