1 files changed, 57 insertions, 0 deletions
diff --git a/unicode/unicode_canonical.c b/unicode/unicode_canonical.c
new file mode 100644
index 0000000..3f6773f
--- /dev/null
+++ b/unicode/unicode_canonical.c
@@ -0,0 +1,57 @@
+/*
+** Copyright 2020 Double Precision, Inc.
+** See COPYING for distribution information.
+**
+*/
+
+#include	"unicode_config.h"
+#include	"courier-unicode.h"
+#include <string.h>
+
+struct canon_map_table {
+	char32_t lookup_char;
+	unsigned char fmt_flag_v;
+	unsigned char n_chars;
+	unsigned short offset;
+};
+
+#include "canonicalmappings.h"
+
+unicode_canonical_t unicode_canonical(char32_t c)
+{
+	size_t i=canon_map_hash[c % HASH_SIZE]
+		+
+		/* Compile-time sanity check */
+		sizeof(char[ sizeof(canon_map_hash)/
+			     sizeof(canon_map_hash[0]) == HASH_SIZE
+			     ? 1:-1])*0;
+
+	while (i < sizeof(canon_map_lookup)/sizeof(canon_map_lookup[0]))
+	{
+		if (canon_map_lookup[i].lookup_char == c)
+		{
+			unicode_canonical_t ret;
+
+			ret.canonical_chars=
+				canon_map_values+canon_map_lookup[i].offset;
+			ret.n_canonical_chars=
+				canon_map_lookup[i].n_chars;
+			ret.format=
+				(unicode_canonical_fmt_t)
+				canon_map_lookup[i].fmt_flag_v;
+
+			return ret;
+		}
+
+		if ((canon_map_lookup[i].lookup_char % HASH_SIZE) !=
+		    (c % HASH_SIZE))
+			break;
+		++i;
+	}
+
+	unicode_canonical_t ret;
+
+	memset(&ret, 0, sizeof(ret));
+
+	return ret;
+}