1 files changed, 89 insertions, 0 deletions
diff --git a/vendor/nunicode/src/libnu/strings.c b/vendor/nunicode/src/libnu/strings.c
new file mode 100644
index 0000000000..0eda8cf08f
--- /dev/null
+++ b/vendor/nunicode/src/libnu/strings.c
@@ -0,0 +1,89 @@
+#include <libnu/defines.h>
+#include <libnu/strings.h>
+
+#if defined (NU_WITH_Z_STRINGS) || defined(NU_WITH_N_STRINGS)
+
+static ssize_t _nu_strlen(const char *encoded, const char *limit, nu_read_iterator_t it) {
+	ssize_t len = 0;
+
+	const char *p = encoded;
+	while (p < limit) {
+		uint32_t u = 0;
+		p = it(p, &u);
+
+		if (u == 0) {
+			break;
+		}
+
+		++len;
+	}
+
+	return len;
+}
+
+static ssize_t _nu_bytelen(const uint32_t *unicode, const uint32_t *limit, nu_write_iterator_t it) {
+	ssize_t len = 0;
+
+	const uint32_t *p = unicode;
+	while (p < limit) {
+		if (*p == 0) {
+			break;
+		}
+
+		/* nu_write_iterator_t will return offset relative to 0
+		 * which is effectively bytes length of codepoint */
+		size_t byte_len = (size_t)it(*p, 0);
+		len += byte_len;
+
+		++p;
+	}
+
+	return len;
+}
+
+static ssize_t _nu_strbytelen(const char *encoded, const char *limit, nu_read_iterator_t it) {
+	uint32_t u = 0;
+	const char *p = encoded;
+
+	while (p < limit) {
+		const char *np = it(p, &u);
+
+		if (u == 0) {
+			return (p - encoded);
+		}
+
+		p = np;
+	}
+
+	return 0;
+}
+
+#endif /* NU_WITH_N_STRINGS || NU_WITH_Z_STRINGS */
+
+#ifdef NU_WITH_Z_STRINGS
+
+ssize_t nu_strlen(const char *encoded, nu_read_iterator_t it) {
+	return _nu_strlen(encoded, NU_UNLIMITED, it);
+}
+
+ssize_t nu_bytelen(const uint32_t *unicode, nu_write_iterator_t it) {
+	return _nu_bytelen(unicode, NU_UNLIMITED, it);
+}
+
+ssize_t nu_strbytelen(const char *encoded, nu_read_iterator_t it) {
+	return _nu_strbytelen(encoded, NU_UNLIMITED, it);
+}
+
+#endif /* NU_WITH_Z_STRINGS */
+
+#ifdef NU_WITH_N_STRINGS
+
+ssize_t nu_strnlen(const char *encoded, size_t max_len, nu_read_iterator_t it) {
+	return _nu_strlen(encoded, encoded + max_len, it);
+}
+
+ssize_t nu_bytenlen(const uint32_t *unicode, size_t max_len, nu_write_iterator_t it) {
+	return _nu_bytelen(unicode, unicode + max_len, it);
+}
+
+#endif /* NU_WITH_N_STRINGS */