Add yijing n-grams

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 31 insertions, 0 deletions

diff --git a/libcharconv_yijing_monograms.c b/libcharconv_yijing_monograms.c
new file mode 100644
index 0000000..12177ec
--- /dev/null
+++ b/libcharconv_yijing_monograms.c
@@ -0,0 +1,31 @@
+/* See LICENSE file for copyright and license details. */
+#include "lib-common.h"
+
+
+enum libcharconv_result
+libcharconv_yijing_monograms(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
+{
+	uint_least32_t c;
+	*n = 0;
+	for (; slen--; s++) {
+		switch (*s) {
+		case '1': c = UINT32_C(0x268A); goto conv;
+		case '2': c = UINT32_C(0x268B); goto conv;
+		case '3': c = UINT32_C(0x1D300); goto conv;
+		default:
+			*n += 1u;
+			break;
+		}
+	}
+no_conv:
+	return LIBCHARCONV_NO_CONVERT;
+
+conv:
+	if (*n)
+		goto no_conv;
+	if (*ncp)
+		*cp = c;
+	*n += 1u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+}