LibC: Implement wcslcpy

2 files changed, 13 insertions, 0 deletions

diff --git a/Userland/Libraries/LibC/wchar.cpp b/Userland/Libraries/LibC/wchar.cpp
index 794fef19fe..9462f87c04 100644
--- a/Userland/Libraries/LibC/wchar.cpp
+++ b/Userland/Libraries/LibC/wchar.cpp
@@ -69,6 +69,18 @@ wchar_t* wcsncpy(wchar_t* dest, const wchar_t* src, size_t num)
     return original_dest;
 }
 
+size_t wcslcpy(wchar_t* dest, const wchar_t* src, size_t n)
+{
+    size_t i;
+    for (i = 0; i + 1 < n && src[i] != L'\0'; ++i)
+        dest[i] = src[i];
+    if (n)
+        dest[i] = L'\0';
+    for (; src[i] != L'\0'; ++i)
+        ; // Determine the length of src, don't copy.
+    return i;
+}
+
 int wcscmp(const wchar_t* s1, const wchar_t* s2)
 {
     while (*s1 == *s2++)
diff --git a/Userland/Libraries/LibC/wchar.h b/Userland/Libraries/LibC/wchar.h
index b47b412cc3..12ef0f530c 100644
--- a/Userland/Libraries/LibC/wchar.h
+++ b/Userland/Libraries/LibC/wchar.h
@@ -29,6 +29,7 @@ struct tm;
 size_t wcslen(const wchar_t*);
 wchar_t* wcscpy(wchar_t*, const wchar_t*);
 wchar_t* wcsncpy(wchar_t*, const wchar_t*, size_t);
+__attribute__((warn_unused_result)) size_t wcslcpy(wchar_t*, const wchar_t*, size_t);
 int wcscmp(const wchar_t*, const wchar_t*);
 int wcsncmp(const wchar_t*, const wchar_t*, size_t);
 wchar_t* wcschr(const wchar_t*, int);