140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
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#include "precomp.hxx"
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#include <wchar.h> // wcsncpy
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BOOL
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NetpCopyStringToBuffer (
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IN LPWSTR String OPTIONAL,
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IN DWORD CharacterCount,
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IN LPWSTR FixedDataEnd,
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IN OUT LPWSTR *EndOfVariableData,
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OUT LPWSTR *VariableDataPointer
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)
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/*++
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Routine Description:
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This routine puts a single variable-length string into an output buffer.
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The string is not written if it would overwrite the last fixed structure
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in the buffer.
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The code is swiped from svcsupp.c written by DavidTr.
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Sample usage:
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LPBYTE FixedDataEnd = OutputBuffer + sizeof(WKSTA_INFO_202);
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LPTSTR EndOfVariableData = OutputBuffer + OutputBufferSize;
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//
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// Copy user name
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//
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NetpCopyStringToBuffer(
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UserInfo->UserName.Buffer;
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UserInfo->UserName.Length;
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FixedDataEnd,
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&EndOfVariableData,
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&WkstaInfo->wki202_username
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);
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Arguments:
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String - Supplies a pointer to the source string to copy into the
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output buffer. If String is null then a pointer to a zero terminator
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is inserted into output buffer.
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CharacterCount - Supplies the length of String, not including zero
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terminator. (This in units of characters - not bytes).
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FixedDataEnd - Supplies a pointer to just after the end of the last
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fixed structure in the buffer.
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EndOfVariableData - Supplies an address to a pointer to just after the
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last position in the output buffer that variable data can occupy.
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Returns a pointer to the string written in the output buffer.
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VariableDataPointer - Supplies a pointer to the place in the fixed
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portion of the output buffer where a pointer to the variable data
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should be written.
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Return Value:
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Returns TRUE if string fits into output buffer, FALSE otherwise.
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--*/
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{
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// The following line has been removed. Since we are manipulating
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// either LPSTR or LPWSTR, the pointer arithmetic automatically deals with
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// either bytes or words. It is therefore only proper to deal in terms
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// of characters needed. Not Bytes needed. Therefore, the symbol has
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// been changed from BytesNeeded to CharsNeeded.
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//
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// DWORD BytesNeeded = (CharacterCount + 1) * sizeof(WCHAR);
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//
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//
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DWORD CharsNeeded = (CharacterCount + 1);
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#ifdef remove
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DbgPrint("NetpStringToBuffer: String at " FORMAT_POINTER
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", CharacterCount=" FORMAT_DWORD
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",\n FixedDataEnd at " FORMAT_POINTER
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", *EndOfVariableData at " FORMAT_POINTER
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",\n VariableDataPointer at " FORMAT_POINTER
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", CharsNeeded=" FORMAT_DWORD ".\n",
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String, CharacterCount, FixedDataEnd, *EndOfVariableData,
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VariableDataPointer, CharsNeeded);
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#endif
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//
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// Determine if string will fit, allowing for a zero terminator. If no,
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// just set the pointer to NULL.
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//
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if ((*EndOfVariableData - CharsNeeded) >= FixedDataEnd) {
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//
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// It fits. Move EndOfVariableData pointer up to the location where
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// we will write the string.
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//
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*EndOfVariableData -= CharsNeeded;
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//
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// Copy the string to the buffer if it is not null.
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//
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if (CharacterCount > 0 && String != NULL) {
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wcsncpy(*EndOfVariableData, String, CharacterCount);
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}
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//
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// Set the zero terminator.
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//
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*(*EndOfVariableData + CharacterCount) = (WCHAR) '\0';
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//
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// Set up the pointer in the fixed data portion to point to where the
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// string is written.
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//
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*VariableDataPointer = *EndOfVariableData;
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return TRUE;
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}
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else {
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//
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// It doesn't fit. Set the offset to NULL.
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//
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*VariableDataPointer = NULL;
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return FALSE;
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}
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} // NetpCopyStringToBuffer
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