Alexandre Julliard : ntdll: Add strlwr_s and wcslwr_s.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: a15c55e658a0065709ae1b327e0f238cded4d51a
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=a15c55e658a0065709ae1b327e0f238cded4d51a

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Wed Jun 29 11:51:07 2022 +0200

ntdll: Add strlwr_s and wcslwr_s.

Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/ntdll/ntdll.spec |  2 ++
 dlls/ntdll/string.c   | 21 +++++++++++++++++++--
 dlls/ntdll/wcstring.c | 24 ++++++++++++++++++------
 3 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 18055fe3b9c..91c56d4d92c 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -1521,6 +1521,7 @@
 @ cdecl _strcmpi(str str) _stricmp
 @ cdecl _stricmp(str str)
 @ cdecl _strlwr(str)
+@ cdecl _strlwr_s(str long)
 @ cdecl _strnicmp(str str long)
 @ cdecl _strupr(str)
 @ cdecl _tolower(long)
@@ -1536,6 +1537,7 @@
 @ cdecl _vswprintf(ptr wstr ptr)
 @ cdecl _wcsicmp(wstr wstr)
 @ cdecl _wcslwr(wstr)
+@ cdecl _wcslwr_s(wstr long)
 @ cdecl _wcsnicmp(wstr wstr long)
 @ cdecl _wcsupr(wstr)
 @ cdecl _wtoi(wstr)
diff --git a/dlls/ntdll/string.c b/dlls/ntdll/string.c
index d0330f48926..8fbce780eb2 100644
--- a/dlls/ntdll/string.c
+++ b/dlls/ntdll/string.c
@@ -444,7 +444,7 @@ errno_t __cdecl strncpy_s( char *dst, size_t len, const char *src, size_t count
  */
 size_t __cdecl strnlen( const char *str, size_t len )
 {
-    const char *s = str;
+    const char *s;
     for (s = str; len && *s; s++, len--) ;
     return s - str;
 }
@@ -620,11 +620,28 @@ LPSTR __cdecl _strupr( LPSTR str )
 LPSTR __cdecl _strlwr( LPSTR str )
 {
     LPSTR ret = str;
-    for ( ; *str; str++) *str = tolower(*str);
+    for ( ; *str; str++) if (*str >= 'A' && *str <= 'Z') *str += 'a' - 'A';
     return ret;
 }
 
 
+/*********************************************************************
+ *                  _strlwr_s   (NTDLL.@)
+ */
+errno_t __cdecl _strlwr_s( char *str, size_t len )
+{
+    if (!str) return EINVAL;
+
+    if (strnlen( str, len ) == len)
+    {
+        *str = 0;
+        return EINVAL;
+    }
+    _strlwr( str );
+    return 0;
+}
+
+
 /*********************************************************************
  *                  toupper   (NTDLL.@)
  */
diff --git a/dlls/ntdll/wcstring.c b/dlls/ntdll/wcstring.c
index ed9e1612918..b2662cb9cf1 100644
--- a/dlls/ntdll/wcstring.c
+++ b/dlls/ntdll/wcstring.c
@@ -108,14 +108,26 @@ int __cdecl _wcsicmp( LPCWSTR str1, LPCWSTR str2 )
 LPWSTR __cdecl _wcslwr( LPWSTR str )
 {
     WCHAR *ret = str;
+    for ( ; *str; str++) if (*str >= 'A' && *str <= 'Z') *str += 'a' - 'A';
+    return ret;
+}
 
-    while (*str)
+
+/*********************************************************************
+ *           _wcslwr_s    (NTDLL.@)
+ */
+errno_t __cdecl _wcslwr_s( wchar_t *str, size_t len )
+{
+    if (!str) return EINVAL;
+
+    if (wcsnlen( str, len ) == len)
     {
-        WCHAR ch = *str;
-        if (ch >= 'A' && ch <= 'Z') ch += 32;
-        *str++ = ch;
+        *str = 0;
+        return EINVAL;
     }
-    return ret;
+
+    _wcslwr( str );
+    return 0;
 }
 
 
@@ -380,7 +392,7 @@ errno_t __cdecl wcsncpy_s( wchar_t *dst, size_t len, const wchar_t *src, size_t
  */
 size_t __cdecl wcsnlen( const WCHAR *str, size_t len )
 {
-    const WCHAR *s = str;
+    const WCHAR *s;
     for (s = str; len && *s; s++, len--) ;
     return s - str;
 }