gdi32: Avoid using CRT wide char functions in ntgdi functions.

dlls/gdi32/win32u_private.h

@@ -38,4 +38,94 @@ struct user_callbacks
     HWND (WINAPI *pWindowFromDC)( HDC );
 };
 
+static inline WCHAR *win32u_wcsrchr( const WCHAR *str, WCHAR ch )
+{
+    WCHAR *ret = NULL;
+    do { if (*str == ch) ret = (WCHAR *)(ULONG_PTR)str; } while (*str++);
+    return ret;
+}
+
+static inline WCHAR win32u_towupper( WCHAR ch )
+{
+    return RtlUpcaseUnicodeChar( ch );
+}
+
+static inline WCHAR *win32u_wcschr( const WCHAR *str, WCHAR ch )
+{
+    do { if (*str == ch) return (WCHAR *)(ULONG_PTR)str; } while (*str++);
+    return NULL;
+}
+
+static inline int win32u_wcsicmp( const WCHAR *str1, const WCHAR *str2 )
+{
+    int ret;
+    for (;;)
+    {
+        if ((ret = win32u_towupper( *str1 ) - win32u_towupper( *str2 )) || !*str1) return ret;
+        str1++;
+        str2++;
+    }
+}
+
+static inline int win32u_wcscmp( const WCHAR *str1, const WCHAR *str2 )
+{
+    while (*str1 && (*str1 == *str2)) { str1++; str2++; }
+    return *str1 - *str2;
+}
+
+static inline LONG win32u_wcstol( LPCWSTR s, LPWSTR *end, INT base )
+{
+    BOOL negative = FALSE, empty = TRUE;
+    LONG ret = 0;
+
+    if (base < 0 || base == 1 || base > 36) return 0;
+    if (end) *end = (WCHAR *)s;
+    while (*s == ' ' || *s == '\t') s++;
+
+    if (*s == '-')
+    {
+        negative = TRUE;
+        s++;
+    }
+    else if (*s == '+') s++;
+
+    if ((base == 0 || base == 16) && s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
+    {
+        base = 16;
+        s += 2;
+    }
+    if (base == 0) base = s[0] != '0' ? 10 : 8;
+
+    while (*s)
+    {
+        int v;
+
+        if ('0' <= *s && *s <= '9') v = *s - '0';
+        else if ('A' <= *s && *s <= 'Z') v = *s - 'A' + 10;
+        else if ('a' <= *s && *s <= 'z') v = *s - 'a' + 10;
+        else break;
+        if (v >= base) break;
+        if (negative) v = -v;
+        s++;
+        empty = FALSE;
+
+        if (!negative && (ret > MAXLONG / base || ret * base > MAXLONG - v))
+            ret = MAXLONG;
+        else if (negative && (ret < (LONG)MINLONG / base || ret * base < (LONG)(MINLONG - v)))
+            ret = MINLONG;
+        else
+            ret = ret * base + v;
+    }
+
+    if (end && !empty) *end = (WCHAR *)s;
+    return ret;
+}
+
+#define towupper(c)     win32u_towupper(c)
+#define wcschr(s,c)     win32u_wcschr(s,c)
+#define wcscmp(s1,s2)   win32u_wcscmp(s1,s2)
+#define wcsicmp(s1,s2)  win32u_wcsicmp(s1,s2)
+#define wcsrchr(s,c)    win32u_wcsrchr(s,c)
+#define wcstol(s,e,b)   win32u_wcstol(s,e,b)
+
 #endif /* __WINE_WIN32U_PRIVATE */