add gu_string_buf_data and gu_string_buf_length in libgu

src/runtime/c/gu/string.c

@@ -82,6 +82,20 @@ gu_string_buf_freeze(GuStringBuf* sb, GuPool* pool)
 	return p;
 }
 
+char*
+gu_string_buf_data(GuStringBuf* sb)
+{
+	gu_out_flush(sb->out, NULL);
+	return gu_buf_data(sb->buf);
+}
+
+size_t
+gu_string_buf_length(GuStringBuf* sb)
+{
+	gu_out_flush(sb->out, NULL);
+	return gu_buf_length(sb->buf);
+}
+
 void
 gu_string_buf_flush(GuStringBuf* sb)
 {

src/runtime/c/gu/string.h

@@ -33,6 +33,12 @@ gu_string_buf_out(GuStringBuf* sb);
 GuString
 gu_string_buf_freeze(GuStringBuf* sb, GuPool* pool);
 
+char*
+gu_string_buf_data(GuStringBuf* sb);
+
+size_t
+gu_string_buf_length(GuStringBuf* sb);
+
 void
 gu_string_buf_flush(GuStringBuf* sb);