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/*++
Copyright (c) 1992, 1993 Microsoft Corporation
Module Name:
packstr.c
Abstract:
Contains functions for packing strings into buffers that also contain
structures.
Author:
From LAN Manager netlib.
Rita Wong (ritaw) 2-Mar-1993
Environment:
User Mode - Win32
Revision History:
--*/
#include <procs.h>
BOOL
NwlibCopyStringToBuffer(
IN LPCWSTR SourceString OPTIONAL,
IN DWORD CharacterCount,
IN LPCWSTR FixedDataEnd,
IN OUT LPWSTR *EndOfVariableData,
OUT LPWSTR *VariableDataPointer
)
/*++
Routine Description:
This routine puts a single variable-length string into an output buffer.
The string is not written if it would overwrite the last fixed structure
in the buffer.
Arguments:
SourceString - Supplies a pointer to the source string to copy into the
output buffer. If SourceString is null then a pointer to a zero terminator
is inserted into output buffer.
CharacterCount - Supplies the length of SourceString, not including zero
terminator. (This in units of characters - not bytes).
FixedDataEnd - Supplies a pointer to just after the end of the last
fixed structure in the buffer.
EndOfVariableData - Supplies an address to a pointer to just after the
last position in the output buffer that variable data can occupy.
Returns a pointer to the string written in the output buffer.
VariableDataPointer - Supplies a pointer to the place in the fixed
portion of the output buffer where a pointer to the variable data
should be written.
Return Value:
Returns TRUE if string fits into output buffer, FALSE otherwise.
--*/
{
DWORD CharsNeeded = (CharacterCount + 1);
//
// Determine if source string will fit, allowing for a zero terminator.
// If not, just set the pointer to NULL.
//
if ((*EndOfVariableData - CharsNeeded) >= FixedDataEnd) {
//
// It fits. Move EndOfVariableData pointer up to the location where
// we will write the string.
//
*EndOfVariableData -= CharsNeeded;
//
// Copy the string to the buffer if it is not null.
//
if (CharacterCount > 0 && SourceString != NULL) {
(VOID) wcsncpy(*EndOfVariableData, SourceString, CharacterCount);
}
//
// Set the zero terminator.
//
*(*EndOfVariableData + CharacterCount) = L'\0';
//
// Set up the pointer in the fixed data portion to point to where the
// string is written.
//
*VariableDataPointer = *EndOfVariableData;
return TRUE;
}
else {
//
// It doesn't fit. Set the offset to NULL.
//
*VariableDataPointer = NULL;
return FALSE;
}
}
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