Piotr Caban : msvcrt: Optimize tolower function when locale was never changed.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: a6debb6796853e557a980ba0a293e6a8a6bbfc74
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=a6debb6796853e557a980ba0a293e6a8a6bbfc74

Author: Piotr Caban <piotr at codeweavers.com>
Date:   Wed Jan 23 11:59:05 2019 +0100

msvcrt: Optimize tolower function when locale was never changed.

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
(cherry picked from commit e867af3bfeb5fc50d76cf26816d294d5342fe48c)
Signed-off-by: Michael Stefaniuc <mstefani at winehq.org>

---

 dlls/msvcrt/ctype.c        |  4 +++-
 dlls/msvcrt/locale.c       |  4 ++++
 dlls/msvcrt/msvcrt.h       |  1 +
 dlls/msvcrt/tests/string.c | 14 ++++++++++----
 4 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/dlls/msvcrt/ctype.c b/dlls/msvcrt/ctype.c
index 758411a..17b12e2 100644
--- a/dlls/msvcrt/ctype.c
+++ b/dlls/msvcrt/ctype.c
@@ -458,7 +458,9 @@ int CDECL MSVCRT__tolower_l(int c, MSVCRT__locale_t locale)
  */
 int CDECL MSVCRT_tolower(int c)
 {
-        return MSVCRT__tolower_l(c, NULL);
+    if(initial_locale)
+        return c>='A' && c<='Z' ? c-'A'+'a' : c;
+    return MSVCRT__tolower_l(c, NULL);
 }
 
 /*********************************************************************
diff --git a/dlls/msvcrt/locale.c b/dlls/msvcrt/locale.c
index 1e56395..a1e827d 100644
--- a/dlls/msvcrt/locale.c
+++ b/dlls/msvcrt/locale.c
@@ -48,6 +48,7 @@ int MSVCRT___lc_collate_cp = 0;
 LCID MSVCRT___lc_handle[MSVCRT_LC_MAX - MSVCRT_LC_MIN + 1] = { 0 };
 int MSVCRT___mb_cur_max = 1;
 static unsigned char charmax = CHAR_MAX;
+BOOL initial_locale = TRUE;
 
 #define MSVCRT_LEADBYTE  0x8000
 #define MSVCRT_C1_DEFINED 0x200
@@ -1780,6 +1781,9 @@ char* CDECL MSVCRT_setlocale(int category, const char* locale)
 
     _lock_locales();
 
+    if(locale[0] != 'C' || locale[1] != '\0')
+        initial_locale = FALSE;
+
     if(locinfo->lc_handle[MSVCRT_LC_COLLATE]!=newlocinfo->lc_handle[MSVCRT_LC_COLLATE]
             || locinfo->lc_id[MSVCRT_LC_COLLATE].wCodePage!=newlocinfo->lc_id[MSVCRT_LC_COLLATE].wCodePage) {
         locinfo->lc_collate_cp = newlocinfo->lc_collate_cp;
diff --git a/dlls/msvcrt/msvcrt.h b/dlls/msvcrt/msvcrt.h
index fc91066..02b8628 100644
--- a/dlls/msvcrt/msvcrt.h
+++ b/dlls/msvcrt/msvcrt.h
@@ -283,6 +283,7 @@ extern MSVCRT__locale_t MSVCRT_locale DECLSPEC_HIDDEN;
 extern unsigned int MSVCRT___lc_codepage;
 extern int MSVCRT___lc_collate_cp;
 extern WORD MSVCRT__ctype [257];
+extern BOOL initial_locale DECLSPEC_HIDDEN;
 
 void msvcrt_set_errno(int) DECLSPEC_HIDDEN;
 #if _MSVCR_VER >= 80
diff --git a/dlls/msvcrt/tests/string.c b/dlls/msvcrt/tests/string.c
index e80a518..a159132 100644
--- a/dlls/msvcrt/tests/string.c
+++ b/dlls/msvcrt/tests/string.c
@@ -2788,13 +2788,19 @@ static void test_tolower(void)
 
     errno = 0xdeadbeef;
     ret = p_tolower((char)0xF4);
-    todo_wine ok(ret == (char)0xF4, "ret = %x\n", ret);
-    todo_wine ok(errno == 0xdeadbeef, "errno = %d\n", errno);
+    ok(ret == (char)0xF4, "ret = %x\n", ret);
+    ok(errno == 0xdeadbeef, "errno = %d\n", errno);
 
     errno = 0xdeadbeef;
     ret = p_tolower((char)0xD0);
-    todo_wine ok(ret == (char)0xD0, "ret = %x\n", ret);
-    todo_wine ok(errno == 0xdeadbeef, "errno = %d\n", errno);
+    ok(ret == (char)0xD0, "ret = %x\n", ret);
+    ok(errno == 0xdeadbeef, "errno = %d\n", errno);
+
+    setlocale(LC_ALL, "C");
+    errno = 0xdeadbeef;
+    ret = p_tolower((char)0xF4);
+    ok(ret == (char)0xF4, "ret = %x\n", ret);
+    ok(errno == 0xdeadbeef, "errno = %d\n", errno);
 
     /* test C locale after setting locale */
     if(!setlocale(LC_ALL, "us")) {