initial commit

archive/vendor/github.com/veandco/go-sdl2/sdl/error.go

@@ -0,0 +1,89 @@
+package sdl
+
+/*
+#include "sdl_wrapper.h"
+
+void GoSetError(const char *fmt) {
+  SDL_SetError("%s", fmt);
+}
+
+*/
+// #include "sdl_wrapper.h"
+import "C"
+import "errors"
+
+var emptyCString *C.char = C.CString("")
+var ErrInvalidParameters = errors.New("Invalid Parameters")
+
+// SDL error codes with their corresponding predefined strings.
+const (
+	ENOMEM      ErrorCode = C.SDL_ENOMEM      // out of memory
+	EFREAD                = C.SDL_EFREAD      // error reading from datastream
+	EFWRITE               = C.SDL_EFWRITE     // error writing to datastream
+	EFSEEK                = C.SDL_EFSEEK      // error seeking in datastream
+	UNSUPPORTED           = C.SDL_UNSUPPORTED // that operation is not supported
+	LASTERROR             = C.SDL_LASTERROR   // the highest numbered predefined error
+)
+
+// ErrorCode is an error code used in SDL error messages.
+type ErrorCode uint32
+type cErrorCode C.SDL_errorcode
+
+func (ec ErrorCode) c() C.SDL_errorcode {
+	return C.SDL_errorcode(ec)
+}
+
+// GetError returns the last error that occurred, or an empty string if there hasn't been an error message set since the last call to ClearError().
+// (https://wiki.libsdl.org/SDL_GetError)
+func GetError() error {
+	if err := C.SDL_GetError(); err != nil {
+		gostr := C.GoString(err)
+		// SDL_GetError returns "an empty string if there hasn't been an error message"
+		if len(gostr) > 0 {
+			return errors.New(gostr)
+		}
+	}
+	return nil
+}
+
+// SetError set the SDL error message.
+// (https://wiki.libsdl.org/SDL_SetError)
+func SetError(err error) {
+	if err != nil {
+		C.GoSetError(C.CString(err.Error()))
+		return
+	}
+	C.GoSetError(emptyCString)
+}
+
+// ClearError clears any previous error message.
+// (https://wiki.libsdl.org/SDL_ClearError)
+func ClearError() {
+	C.SDL_ClearError()
+}
+
+// Error sets the SDL error message to the specified error code.
+func Error(code ErrorCode) {
+	C.SDL_Error(code.c())
+}
+
+// OutOfMemory sets SDL error message to ENOMEM (out of memory).
+func OutOfMemory() {
+	Error(ENOMEM)
+}
+
+// Unsupported sets SDL error message to UNSUPPORTED (that operation is not supported).
+func Unsupported() {
+	Error(UNSUPPORTED)
+}
+
+// errorFromInt returns GetError() if passed negative value, otherwise it returns nil.
+func errorFromInt(code int) (err error) {
+	if code < 0 {
+		err = GetError()
+		if err == nil {
+			err = errors.New("Unknown error (probably using old version of SDL2 and the function called is not supported?)")
+		}
+	}
+	return
+}