1 files changed, 78 insertions, 0 deletions
diff --git a/libcharconv_rotated_45deg_cw.c b/libcharconv_rotated_45deg_cw.c
new file mode 100644
index 0000000..06a4b51
--- /dev/null
+++ b/libcharconv_rotated_45deg_cw.c
@@ -0,0 +1,78 @@
+/* See LICENSE file for copyright and license details. */
+#include "lib-common.h"
+
+
+static struct {
+	uint_least32_t from;
+	uint_least32_t to;
+} pairs[] = {
+	{UINT32_C(0x1FA04), UINT32_C(0x1FA08)},
+	{UINT32_C(0x1FA08), UINT32_C(0x1FA19)},
+	{UINT32_C(0x1FA19), UINT32_C(0x1FA1D)},
+	{UINT32_C(0x1FA1D), UINT32_C(0x1FA2E)},
+	{UINT32_C(0x1FA2E), UINT32_C(0x1FA32)},
+	{UINT32_C(0x1FA32), UINT32_C(0x1FA43)},
+	{UINT32_C(0x1FA43), UINT32_C(0x1FA47)},
+	{UINT32_C(0x1FA47), UINT32_C(0x1FA04)},
+	{UINT32_C(0x2658),  UINT32_C(0x1FA06)},
+	{UINT32_C(0x1FA06), UINT32_C(0x1FA0D)},
+	{UINT32_C(0x1FA0D), UINT32_C(0x1FA1B)},
+	{UINT32_C(0x1FA1B), UINT32_C(0x1FA22)},
+	{UINT32_C(0x1FA22), UINT32_C(0x1FA30)},
+	{UINT32_C(0x1FA30), UINT32_C(0x1FA37)},
+	{UINT32_C(0x1FA37), UINT32_C(0x1FA45)},
+	{UINT32_C(0x1FA45), UINT32_C(0x2658)},
+	{UINT32_C(0x265E),  UINT32_C(0x1FA07)},
+	{UINT32_C(0x1FA07), UINT32_C(0x1FA13)},
+	{UINT32_C(0x1FA13), UINT32_C(0x1FA1C)},
+	{UINT32_C(0x1FA1C), UINT32_C(0x1FA28)},
+	{UINT32_C(0x1FA28), UINT32_C(0x1FA31)},
+	{UINT32_C(0x1FA31), UINT32_C(0x1FA3D)},
+	{UINT32_C(0x1FA3D), UINT32_C(0x1FA46)},
+	{UINT32_C(0x1FA46), UINT32_C(0x265E)}
+};
+
+
+enum libcharconv_result
+libcharconv_rotated_45deg_cw(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
+{
+	uint_least32_t c;
+	size_t i, clen;
+	*n = 0;
+	while (slen) {
+		clen = libcharconv_decode_utf8_(s, slen, &c);
+		if (clen > slen) {
+			if (*n)
+				goto no_conv;
+			return LIBCHARCONV_INDETERMINATE;
+		}
+		if (!clen) {
+			*n += 1u;
+			slen -= 1u;
+			s = &s[1];
+			continue;
+		}
+
+		for (i = 0u; i < sizeof(pairs) / sizeof(*pairs); i++) {
+			if (c == pairs[i].from) {
+				c = pairs[i].to;
+				goto conv;
+			}
+		}
+
+		*n += clen;
+		s = &s[clen];
+		slen -= clen;
+	}
+no_conv:
+	return LIBCHARCONV_NO_CONVERT;
+
+conv:
+	if (*n)
+		goto no_conv;
+	if (*ncp)
+		*cp = c;
+	*n += clen;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+}