3 files changed, 63 insertions, 7 deletions
diff --git a/Userland/Libraries/LibC/wchar.cpp b/Userland/Libraries/LibC/wchar.cpp
index 13c5081317..801b7d6d72 100644
--- a/Userland/Libraries/LibC/wchar.cpp
+++ b/Userland/Libraries/LibC/wchar.cpp
@@ -479,12 +479,6 @@ long double wcstold(wchar_t const*, wchar_t**)
     TODO();
 }
 
-int swprintf(wchar_t*, size_t, wchar_t const*, ...)
-{
-    dbgln("TODO: Implement swprintf()");
-    TODO();
-}
-
 int wcwidth(wchar_t wc)
 {
     if (wc == L'\0')
diff --git a/Userland/Libraries/LibC/wchar.h b/Userland/Libraries/LibC/wchar.h
index d17b432180..034009e3ba 100644
--- a/Userland/Libraries/LibC/wchar.h
+++ b/Userland/Libraries/LibC/wchar.h
@@ -61,7 +61,6 @@ unsigned long long wcstoull(const wchar_t*, wchar_t**, int);
 float wcstof(const wchar_t*, wchar_t**);
 double wcstod(const wchar_t*, wchar_t**);
 long double wcstold(const wchar_t*, wchar_t**);
-int swprintf(wchar_t*, size_t, const wchar_t*, ...);
 int wcwidth(wchar_t);
 size_t wcsrtombs(char*, const wchar_t**, size_t, mbstate_t*);
 size_t mbsrtowcs(wchar_t*, const char**, size_t, mbstate_t*);
@@ -81,4 +80,11 @@ wchar_t* fgetws(wchar_t* __restrict ws, int n, FILE* __restrict stream);
 int fputws(const wchar_t* __restrict ws, FILE* __restrict stream);
 int fwide(FILE* stream, int mode);
 
+int wprintf(const wchar_t* __restrict format, ...);
+int fwprintf(FILE* __restrict stream, const wchar_t* __restrict format, ...);
+int swprintf(wchar_t* __restrict wcs, size_t maxlen, const wchar_t* __restrict format, ...);
+int vwprintf(const wchar_t* __restrict format, va_list args);
+int vfwprintf(FILE* __restrict stream, const wchar_t* __restrict format, va_list args);
+int vswprintf(wchar_t* __restrict wcs, size_t maxlen, const wchar_t* __restrict format, va_list args);
+
 __END_DECLS
diff --git a/Userland/Libraries/LibC/wstdio.cpp b/Userland/Libraries/LibC/wstdio.cpp
index 521551a208..d98fb71925 100644
--- a/Userland/Libraries/LibC/wstdio.cpp
+++ b/Userland/Libraries/LibC/wstdio.cpp
@@ -6,6 +6,7 @@
 
 #include <AK/Assertions.h>
 #include <AK/BitCast.h>
+#include <AK/PrintfImplementation.h>
 #include <AK/StringBuilder.h>
 #include <AK/Types.h>
 #include <bits/stdio_file_implementation.h>
@@ -118,4 +119,59 @@ int fputws(wchar_t const* __restrict ws, FILE* __restrict stream)
     }
     return size;
 }
+
+int wprintf(wchar_t const* __restrict format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    auto rc = vfwprintf(stdout, format, ap);
+    va_end(ap);
+    return rc;
+}
+
+int fwprintf(FILE* __restrict stream, wchar_t const* __restrict format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    auto rc = vfwprintf(stream, format, ap);
+    va_end(ap);
+    return rc;
+}
+
+int swprintf(wchar_t* __restrict wcs, size_t max_length, wchar_t const* __restrict format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    auto rc = vswprintf(wcs, max_length, format, ap);
+    va_end(ap);
+    return rc;
+}
+
+int vwprintf(wchar_t const* __restrict format, va_list args)
+{
+    return vfwprintf(stdout, format, args);
+}
+
+int vfwprintf(FILE* __restrict stream, wchar_t const* __restrict format, va_list args)
+{
+    auto const* fmt = bit_cast<wchar_t const*>(format);
+    return printf_internal([stream](wchar_t*&, wchar_t wc) {
+        putwc(wc, stream);
+    },
+        nullptr, fmt, args);
+}
+
+int vswprintf(wchar_t* __restrict wcs, size_t max_length, wchar_t const* __restrict format, va_list args)
+{
+    auto const* fmt = bit_cast<wchar_t const*>(format);
+    size_t length_so_far = 0;
+    printf_internal([max_length, &length_so_far](wchar_t*& buffer, wchar_t wc) {
+        if (length_so_far > max_length)
+            return;
+        *buffer++ = wc;
+        ++length_so_far;
+    },
+        wcs, fmt, args);
+    return static_cast<int>(length_so_far);
+}
 }