Untested raw implementation of MultiByteToWideChar().

[reactos.git] / reactos / lib / kernel32 / misc / stubs.c

diff --git a/reactos/lib/kernel32/misc/stubs.c b/reactos/lib/kernel32/misc/stubs.c
index 3e42ca4..598f6ee 100644 (file)
--- a/reactos/lib/kernel32/misc/stubs.c
+++ b/reactos/lib/kernel32/misc/stubs.c
@@ -1,4 +1,4 @@
-/* $Id: stubs.c,v 1.11 1999/12/26 15:50:44 dwelch Exp $
+/* $Id: stubs.c,v 1.12 2000/02/14 22:10:46 ea Exp $
  *
  * KERNEL32.DLL stubs (unimplemented functions)
  * Remove from this file, if you implement them.
@@ -2878,7 +2878,69 @@ MulDiv (
 }
 
 
-int
+/**********************************************************************
+ * NAME                                                        PRIVATE
+ *     IsInstalledCP@4
+ *
+ * RETURN VALUE
+ *     TRUE if CodePage is installed in the system.
+ */
+static
+BOOL
+STDCALL
+IsInstalledCP (
+       UINT    CodePage
+       )
+{
+       /* FIXME */
+       return TRUE;
+}
+
+
+/**********************************************************************
+ * NAME                                                        EXPORTED
+ *     MultiByteToWideChar@24
+ *
+ * ARGUMENTS
+ *     CodePage
+ *             CP_ACP          ANSI code page
+ *             CP_MACCP        Macintosh code page
+ *             CP_OEMCP        OEM code page
+ *             (UINT)          Any installed code page
+ *
+ *     dwFlags
+ *             MB_PRECOMPOSED
+ *             MB_COMPOSITE
+ *             MB_ERR_INVALID_CHARS
+ *             MB_USEGLYPHCHARS
+ *             
+ *     lpMultiByteStr
+ *             Input buffer;
+ *             
+ *     cchMultiByte
+ *             Size of MultiByteStr, or -1 if MultiByteStr is
+ *             NULL terminated;
+ *             
+ *     lpWideCharStr
+ *             Output buffer;
+ *             
+ *     cchWideChar
+ *             Size (in WCHAR unit) of WideCharStr, or 0
+ *             if the caller just wants to know how large
+ *             WideCharStr should be for a successful
+ *             conversion.
+ *
+ * RETURN VALUE
+ *     0 on error; otherwise the number of WCHAR written
+ *     in the WideCharStr buffer.
+ *
+ * NOTE
+ *     A raw converter for now. It assumes lpMultiByteStr is
+ *     NEVER multi-byte (that is each input character is 
+ *     8-bit ASCII) and is ALWAYS NULL terminated.
+ *     FIXME-FIXME-FIXME-FIXME
+ */
+INT
 STDCALL
 MultiByteToWideChar (
        UINT    CodePage,
@@ -2889,8 +2951,94 @@ MultiByteToWideChar (
        int     cchWideChar
        )
 {
-       SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-       return 0;
+       int     InStringLength = 0;
+       BOOL    InIsNullTerminated = TRUE;
+       PCHAR   r;
+       PWCHAR  w;
+       int     cchConverted;
+
+       /*
+        * Check the parameters.
+        */
+       if (    /* --- CODE PAGE --- */
+               (       (CP_ACP != CodePage)
+                       && (CP_MACCP != CodePage)
+                       && (CP_OEMCP != CodePage)
+                       && (FALSE == IsInstalledCP (CodePage))
+                       )
+               /* --- FLAGS --- */
+               || (dwFlags ^ ( MB_PRECOMPOSED
+                               | MB_COMPOSITE
+                               | MB_ERR_INVALID_CHARS
+                               | MB_USEGLYPHCHARS
+                               )
+                       )
+               /* --- INPUT BUFFER --- */
+               || (NULL == lpMultiByteStr)
+               )
+       {
+               SetLastError (ERROR_INVALID_PARAMETER);
+               return 0;
+       }
+       /*
+        * Compute the input buffer length.
+        */
+       if (-1 == cchMultiByte)
+       {
+               InStringLength = lstrlen (lpMultiByteStr);
+       }
+       else
+       {
+               InIsNullTerminated = FALSE;
+               InStringLength = cchMultiByte;
+       }
+       /*
+        * Does caller query for output
+        * buffer size?
+        */
+       if (0 == cchWideChar)
+       {
+               SetLastError (ERROR_SUCCESS);
+               return InStringLength;
+       }
+       /*
+        * Is space provided for the translated
+        * string enough?
+        */
+       if (cchWideChar < InStringLength)
+       {
+               SetLastError (ERROR_INSUFFICIENT_BUFFER);
+               return 0;
+       }
+       /*
+        * Raw 8- to 16-bit conversion.
+        */
+       for (   cchConverted = 0,
+               r = (PCHAR) lpMultiByteStr,
+               w = (PWCHAR) lpWideCharStr;
+               
+               ((*r) && (cchConverted < cchWideChar));
+
+               r++,
+               cchConverted++
+               )
+       {
+               *w = (WCHAR) *r;
+       }
+       /*
+        * Is the input string NULL terminated?
+        */
+       if (TRUE == InIsNullTerminated)
+       {
+               *w = L'\0';
+               ++cchConverted;
+       }
+       /*
+        * Return how many characters we
+        * wrote in the output buffer.
+        */
+       SetLastError (ERROR_SUCCESS);
+       return cchConverted;
 }