From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/multibyte/wcsnrtombs.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 src/multibyte/wcsnrtombs.c

(limited to 'src/multibyte/wcsnrtombs.c')

diff --git a/src/multibyte/wcsnrtombs.c b/src/multibyte/wcsnrtombs.c
new file mode 100644
index 0000000..95e25e7
--- /dev/null
+++ b/src/multibyte/wcsnrtombs.c
@@ -0,0 +1,35 @@
+#include <wchar.h>
+#include <limits.h>
+#include <string.h>
+
+size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
+{
+	const wchar_t *ws = *wcs;
+	size_t cnt = 0;
+	if (!dst) n=0;
+	while (ws && wn) {
+		char tmp[MB_LEN_MAX];
+		size_t l = wcrtomb(n<MB_LEN_MAX ? tmp : dst, *ws, 0);
+		if (l==-1) {
+			cnt = -1;
+			break;
+		}
+		if (dst) {
+			if (n<MB_LEN_MAX) {
+				if (l>n) break;
+				memcpy(dst, tmp, l);
+			}
+			dst += l;
+			n -= l;
+		}
+		if (!*ws) {
+			ws = 0;
+			break;
+		}
+		ws++;
+		wn--;
+		cnt += l;
+	}
+	if (dst) *wcs = ws;
+	return cnt;
+}
-- 
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