Greeting,
UnicodeVSPrint is not returning the correct (expected) string length. The
simple program below demonstrates
the problem. The build environment is UDK2010.SR1.UP1. This demo was built
as a module in MdeModulePkg.
When the demo program is run the output is:
fooprint:Count: 6
Count = 6
fooprint:Count: 127
Count = 127
fooprint:Count: 127
Count = 127
Any recommendations? I am not seeing any problem with the code so I have no
idea what is going on.
(This has led to a mind-bend debug exercise in live code due to pointer
arithmetic not being as intended...pfew!)
TIA!
-------- Vprint.c --------
#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/UefiApplicationEntryPoint.h>
#include <Library/PrintLib.h>
CHAR16 Buffer[128];
CHAR16 String1[] = L"a string";
CHAR16 String2[] = L"a longer string";
CHAR16 String3[] = L"an even longer string";
UINTN
fooprint (
IN CONST CHAR16 *Format,
...
)
{
UINTN Count;
VA_LIST Marker;
VA_START (Marker, Format);
Count = UnicodeVSPrint (Buffer, sizeof Buffer, Format, Marker);
VA_END (Marker);
Print (L"fooprint:Count: %d\n", Count);
return Count;
}
EFI_STATUS
EFIAPI
UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
UINTN Count;
Count = fooprint (L"%s", String1);
Print (L"Count = %d\n", Count);
Count = fooprint (L"%s", String2);
Print (L"Count = %d\n", Count);
Count = fooprint (L"%s", String3);
Print (L"Count = %d\n", Count);
return EFI_SUCCESS;
}
-------- Vprint.inf --------
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = Vprint
FILE_GUID = f9bfca86-a0b5-41f8-ba8a-1f2e9428ec06
MODULE_TYPE = UEFI_APPLICATION
VERSION_STRING = 1.0
ENTRY_POINT = UefiMain
[Sources]
Vprint.c
[Packages]
MdePkg/MdePkg.dec
MdeModulePkg/MdeModulePkg.dec
[LibraryClasses]
UefiApplicationEntryPoint
UefiLib
PrintLib
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