168 lines
5 KiB
C
168 lines
5 KiB
C
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/*++
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Copyright (c) 1989-91 Microsoft Corporation
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Module Name:
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mapsupp.c
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Abstract:
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Support routines used by the LanMan 16/32 mapping routines.
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Author:
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Dan Hinsley (danhi) 25-Mar-1991
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Environment:
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User mode only.
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Revision History:
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25-Mar-1991 DanHi
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Created.
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18-Aug-1991 JohnRo
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Implement downlevel NetWksta APIs. (Moved this routine to NetLib for
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use by RpcXlate as well as NetCmd/Map32 stuff.)
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Changed to allow UNICODE.
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Changed name to NetpMoveStrings.
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Got rid of tabs in source file.
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--*/
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// These must be included first:
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#include <windef.h> // BOOL, IN, LPTSTR, etc.
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// These may be included in any order:
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#include <mapsupp.h> // My prototype, LPMOVESTRING.
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#include <tstring.h> // STRCPY().
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BOOL
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NetpMoveStrings(
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IN OUT LPTSTR * Floor,
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IN LPTSTR pInputBuffer,
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OUT LPTSTR pOutputBuffer,
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IN LPMOVESTRING MoveStringArray,
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IN LPDWORD MoveStringLength
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)
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/*++
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Routine Description:
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This function is used to move a variable number of strings into a user's
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buffer, and to update pointers in a structure to point to the location
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where they are copied. According to the semantics of the LM 2.0 API,
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each buffer is filled with fixed length structures from the top, while
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variable length strings are copied in from the bottom.
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There are two companion arrays, MoveStringArray and MoveStringLength.
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MoveStringArray contains the offset to the source string in the input
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buffer, and the offset of the pointers in the fixed structure from the
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beginning of the output buffer.
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MoveStringLength contains an entry for each entry in MoveStringArray,
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and this entry is the length of the source string in MoveStringArray.
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This was broken into two arrays so that MoveStringArray could be built
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at compile time and not be modified at run time.
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Arguments:
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Floor - This is the bottom of the user's buffer, where the strings
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will be copied. This must be updated to reflect the strings
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that are copied into the buffer
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pInputBuffer - The buffer which contains the source strings.
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MoveStringArray contains offsets into this buffer.
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pOutputBuffer - The buffer which contains the fixed portion of the info
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structure, which contains fields that need to be set to point
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to the string locations in the output buffer. MoveStringArray
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contains offsets into this buffer.
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MoveStringArray - This is an array of MOVESTRING entries, terminated
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by an entry with a source offset of MOVESTRING_END_MARKER. Each
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entry describes a string, and the address of a variable which will
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hold the address where the string is copied.
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MoveStringLength - This is a companion array to MoveStringArray.
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Each entry contains the length of the matching source string
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from MoveStringArray.
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Side Effects:
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There are pointers in the MoveStringArray that point to pointers in the
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fixed length portion of the structure. These are updated with the
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location in the buffer where the string is copied.
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Return Value:
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TRUE if the strings were successfully copied,
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FALSE if the strings would not all fit in the buffer.
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--*/
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{
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//
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// Move them all in, and update Floor
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//
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while(MoveStringArray->Source != MOVESTRING_END_MARKER) {
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//
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// Since the following is a really gross piece of code, let me
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// explain:
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// pInputBuffer is a pointer to the start of a lanman struct and
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// MoveStringArray->Source is an offset from the start of that
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// structure to a PSZ.
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//
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// If this is a 0 length string, just place NULL in the pointer and
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// press on.
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if (*MoveStringLength == 0) {
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*((LPTSTR *) (((LPBYTE) pOutputBuffer)
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+ MoveStringArray->Destination)) = NULL;
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}
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else {
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//
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// Back the pointer up since we're filling the buffer from the
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// bottom up, then do the copy
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//
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*Floor -= *MoveStringLength;
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(void) STRCPY(*Floor,
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*((LPTSTR*)((LPBYTE)pInputBuffer + MoveStringArray->Source)));
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//
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// Update the field in the structure which points to the string
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//
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// pOutputBuffer is a pointer to the start of a lanman struct
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// and MoveStringArray->Destination is an offset from the start
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// of that structure to a PSZ that needs to have the address of
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// the just copied string put into it.
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//
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*((LPTSTR*) ((LPBYTE)pOutputBuffer + MoveStringArray->Destination)) =
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*Floor;
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}
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//
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// Now let's do the next one
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//
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MoveStringArray++;
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MoveStringLength++;
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}
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return(TRUE);
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}
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