1 files changed, 52 insertions, 0 deletions
diff --git a/libcharconv_counting_rods.c b/libcharconv_counting_rods.c
new file mode 100644
index 0000000..f50433c
--- /dev/null
+++ b/libcharconv_counting_rods.c
@@ -0,0 +1,52 @@
+/* See LICENSE file for copyright and license details. */
+#include "lib-common.h"
+
+
+enum libcharconv_result
+libcharconv_counting_rods(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++) {
+		if ('1' <= *s && *s <= '9') {
+			c = UINT32_C(0x13D60) + (unsigned)(*s - '1');
+			if (!slen)
+				goto conv_if_end;
+			if (s[1] != '0')
+				goto conv1;
+			c += 9u;
+			goto conv2;
+		} else {
+			*n += 1u;
+		}
+	}
+no_conv:
+	return LIBCHARCONV_NO_CONVERT;
+
+conv_if_end:
+	if (*n)
+		goto no_conv;
+	if (*ncp)
+		*cp = c;
+	*n += 1u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERT_IF_END;
+
+conv1:
+	if (*n)
+		goto no_conv;
+	if (*ncp)
+		*cp = c;
+	*n += 1u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+
+conv2:
+	if (*n)
+		goto no_conv;
+	if (*ncp)
+		*cp = c;
+	*n += 2u;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+}