1 files changed, 85 insertions, 0 deletions
diff --git a/libcharconv_domino_tiles_horizontal.c b/libcharconv_domino_tiles_horizontal.c
new file mode 100644
index 0000000..5edf493
--- /dev/null
+++ b/libcharconv_domino_tiles_horizontal.c
@@ -0,0 +1,85 @@
+/* See LICENSE file for copyright and license details. */
+#include "lib-common.h"
+
+
+enum libcharconv_result
+libcharconv_domino_tiles_horizontal(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
+{
+	uint_least32_t c;
+	int vertical;
+	*n = 0;
+	for (; slen--; s++) {
+		if ('0' <= s[0] && s[0] <= '6') {
+			if (!slen--)
+				return LIBCHARCONV_INDETERMINATE;
+			vertical = 0;
+			if (s[1] == '|')
+				vertical = 0;
+			else if (s[1] == '-')
+				vertical = 1;
+			else if ('0' <= s[1] && s[1] <= '6')
+				goto conv2;
+			else
+				goto no_match;
+			if (!slen--)
+				return LIBCHARCONV_INDETERMINATE;
+			if ('0' <= s[2] && s[2] <= '6')
+				goto conv3;
+			goto no_match;
+		} else if (s[0] == '#') {
+			if (!slen--)
+				return LIBCHARCONV_INDETERMINATE;
+			vertical = 0;
+			if (s[1] == '|')
+				vertical = 0;
+			else if (s[1] == '-')
+				vertical = 1;
+			else if (s[1] == '#')
+				goto conv2;
+			else
+				goto no_match;
+			if (!slen--)
+				return LIBCHARCONV_INDETERMINATE;
+			if (s[2] == '#')
+				goto conv3;
+			goto no_match;
+		} else {
+		no_match:
+			*n += 1u;
+		}
+	}
+no_conv:
+	return LIBCHARCONV_NO_CONVERT;
+
+conv2:
+	if (*n)
+		goto no_conv;
+	if (*ncp) {
+		if (s[0] == '#')
+			c = UINT32_C(0x1F030);
+		else
+			c = UINT32_C(0x1F031) + (unsigned)(s[0] - '0') * 7u + (unsigned)(s[1] - '0');
+		if (vertical)
+			c += UINT32_C(0x1F062) - UINT32_C(0x1F030);
+		*cp = c;
+	}
+	*n += 2u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+
+conv3:
+	if (*n)
+		goto no_conv;
+	if (*ncp) {
+		if (s[0] == '#')
+			c = UINT32_C(0x1F030);
+		else
+			c = UINT32_C(0x1F031) + (unsigned)(s[0] - '0') * 7u + (unsigned)(s[2] - '0');
+		if (vertical)
+			c += UINT32_C(0x1F062) - UINT32_C(0x1F030);
+		*cp = c;
+	}
+	*n += 3u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+}