From e611b132f9b8abe35b362e5870b74bce94a1e58e Mon Sep 17 00:00:00 2001
From: Adam <you@example.com>
Date: Sat, 16 May 2020 20:51:50 -0700
Subject: initial commit

---
 private/nw/nwlib/packstr.c | 125 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 private/nw/nwlib/packstr.c

(limited to 'private/nw/nwlib/packstr.c')

diff --git a/private/nw/nwlib/packstr.c b/private/nw/nwlib/packstr.c
new file mode 100644
index 000000000..d66cef0e3
--- /dev/null
+++ b/private/nw/nwlib/packstr.c
@@ -0,0 +1,125 @@
+/*++
+
+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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