Piotr Caban : msvcrt: Optimize _strupr implementation in C locale.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 52415cabb078bac172d21c1a41dc81520eeca1f1
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=52415cabb078bac172d21c1a41dc81520eeca1f1

Author: Piotr Caban <piotr at codeweavers.com>
Date:   Thu Mar 22 18:51:50 2018 +0100

msvcrt: Optimize _strupr implementation in C locale.

Don't write to input buffer when there's nothing to change.

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msvcrt/string.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/dlls/msvcrt/string.c b/dlls/msvcrt/string.c
index 2c05e37..d70f235 100644
--- a/dlls/msvcrt/string.c
+++ b/dlls/msvcrt/string.c
@@ -117,6 +117,7 @@ char* CDECL MSVCRT__strlwr(char *str)
  */
 int CDECL MSVCRT__strupr_s_l(char *str, MSVCRT_size_t len, MSVCRT__locale_t locale)
 {
+    MSVCRT_pthreadlocinfo locinfo;
     char *ptr = str;
 
     if (!str || !len)
@@ -138,10 +139,27 @@ int CDECL MSVCRT__strupr_s_l(char *str, MSVCRT_size_t len, MSVCRT__locale_t loca
         return MSVCRT_EINVAL;
     }
 
-    while (*str)
+    if(!locale)
+        locinfo = get_locinfo();
+    else
+        locinfo = locale->locinfo;
+
+    if(!locinfo->lc_handle[MSVCRT_LC_CTYPE])
     {
-        *str = MSVCRT__toupper_l((unsigned char)*str, locale);
-        str++;
+        while (*str)
+        {
+            if (*str >= 'a' && *str <= 'z')
+                *str -= 'a' - 'A';
+            str++;
+        }
+    }
+    else
+    {
+        while (*str)
+        {
+            *str = MSVCRT__toupper_l((unsigned char)*str, locale);
+            str++;
+        }
     }
 
     return 0;