From c7a4ea9d489b99787a22106ae53387f138002dcf Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Sat, 11 Apr 2026 10:10:13 +0300
Subject: [PATCH] [CRT] Remove _mbstrlen

---
 sdk/lib/crt/CMakeLists.txt          |  1 -
 sdk/lib/crt/libcntpr.cmake          |  1 -
 sdk/lib/crt/mbstring/mbstring.cmake |  4 ----
 sdk/lib/crt/mbstring/mbstrlen.c     | 37 -----------------------------
 4 files changed, 43 deletions(-)
 delete mode 100644 sdk/lib/crt/mbstring/mbstring.cmake
 delete mode 100644 sdk/lib/crt/mbstring/mbstrlen.c

diff --git a/sdk/lib/crt/CMakeLists.txt b/sdk/lib/crt/CMakeLists.txt
index 3b41fb6663a..eed421d9055 100644
--- a/sdk/lib/crt/CMakeLists.txt
+++ b/sdk/lib/crt/CMakeLists.txt
@@ -6,7 +6,6 @@ add_definitions(-D_CRTBLD)
 include(except/except.cmake)
 include(float/float.cmake)
 include(math/math.cmake)
-include(mbstring/mbstring.cmake)
 include(mem/mem.cmake)
 include(misc/misc.cmake)
 include(printf/printf.cmake)
diff --git a/sdk/lib/crt/libcntpr.cmake b/sdk/lib/crt/libcntpr.cmake
index 470cc5854a6..9457145fd52 100644
--- a/sdk/lib/crt/libcntpr.cmake
+++ b/sdk/lib/crt/libcntpr.cmake
@@ -3,7 +3,6 @@ list(APPEND LIBCNTPR_SOURCE
     ${LIBCNTPR_EXCEPT_SOURCE}
     ${LIBCNTPR_FLOAT_SOURCE}
     ${LIBCNTPR_MATH_SOURCE}
-    ${LIBCNTPR_MBSTRING_SOURCE}
     ${LIBCNTPR_MEM_SOURCE}
     ${LIBCNTPT_MISC_SOURCE}
     ${LIBCNTPR_PRINTF_SOURCE}
diff --git a/sdk/lib/crt/mbstring/mbstring.cmake b/sdk/lib/crt/mbstring/mbstring.cmake
deleted file mode 100644
index 46427c9aad3..00000000000
--- a/sdk/lib/crt/mbstring/mbstring.cmake
+++ /dev/null
@@ -1,4 +0,0 @@
-
-list(APPEND LIBCNTPR_MBSTRING_SOURCE
-    mbstring/mbstrlen.c
-)
diff --git a/sdk/lib/crt/mbstring/mbstrlen.c b/sdk/lib/crt/mbstring/mbstrlen.c
deleted file mode 100644
index ace65ed8f20..00000000000
--- a/sdk/lib/crt/mbstring/mbstrlen.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * COPYRIGHT:   See COPYING in the top level directory
- * PROJECT:     ReactOS system libraries
- * FILE:        lib/sdk/crt/mbstring/mbstrlen.c
- * PURPOSE:      Determines the length of a multi byte string, current locale
- * PROGRAMERS:
- *              Copyright 1999 Alexandre Julliard
- *              Copyright 2000 Jon Griffths
- *
- */
-
-#include <mbstring.h>
-#include <stdlib.h>
-
-#ifdef _LIBCNT_
-unsigned short *NlsLeadByteInfo;
-#define isleadbyte(c) NlsLeadByteInfo[c]
-#else
-int isleadbyte(int byte);
-#endif
-
-/*
- * @implemented
- */
-size_t __cdecl _mbstrlen( const char *str )
-{
-  size_t len = 0;
-  while(*str)
-  {
-    /* FIXME: According to the documentation we are supposed to test for
-     * multi-byte character validity. Whatever that means
-     */
-    str += isleadbyte((unsigned char)*str) ? 2 : 1;
-    len++;
-  }
-  return len;
-}