initial import of the C runtime

src/runtime/c/gu/ucs.h

@@ -0,0 +1,53 @@
+#ifndef GU_UCS_H_
+#define GU_UCS_H_
+
+#include <gu/defs.h>
+#include <gu/exn.h>
+#include <gu/assert.h>
+
+
+#if defined(__STDC_ISO_10646__) && WCHAR_MAX >= 0x10FFFF
+#include <wchar.h>
+#define GU_UCS_WCHAR
+typedef wchar_t GuUCS;
+#else
+typedef int32_t GuUCS;
+#endif
+
+#define GU_UCS_MAX ((GuUCS)(0x10FFFF))
+
+bool
+gu_char_is_valid(char c);
+
+inline bool
+gu_ucs_valid(GuUCS ucs)
+{
+	return ucs >= 0 && ucs <= GU_UCS_MAX;
+}
+
+inline GuUCS
+gu_char_ucs(char c)
+{
+	gu_require(gu_char_is_valid(c));
+#ifdef GU_CHAR_ASCII
+	GuUCS u = (GuUCS) c;
+#else
+	extern const uint8_t gu_ucs_ascii_reverse_[CHAR_MAX];
+	GuUCS u = gu_ucs_ascii_reverse_[(unsigned char) c];
+#endif
+	gu_ensure(u < 0x80);
+	return u;
+}
+
+char
+gu_ucs_char(GuUCS uc, GuExn* err);
+
+size_t
+gu_str_to_ucs(const char* cbuf, size_t len, GuUCS* ubuf, GuExn* err);
+
+size_t
+gu_ucs_to_str(const GuUCS* ubuf, size_t len, char* cbuf, GuExn* err);
+
+extern GU_DECLARE_TYPE(GuUCSExn, abstract);
+
+#endif // GU_ISO10646_H_