mirror of
https://github.com/FirebirdSQL/firebird.git
synced 2025-02-01 04:43:03 +01:00
117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
/*
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* PROGRAM: Misc. Function for Server and Tools
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* MODULE: chop.c
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* DESCRIPTION: Function to nicely truncate a long path/file name
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* to a specified length.
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*
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* The contents of this file are subject to the Interbase Public
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* License Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy
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* of the License at http://www.Inprise.com/IPL.html
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*
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* Software distributed under the License is distributed on an
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* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
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* or implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code was created by Inprise Corporation
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* and its predecessors. Portions created by Inprise Corporation are
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* Copyright (C) Inprise Corporation.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#include "firebird.h"
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#include "../jrd/ibase.h"
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#include "../jrd/common.h"
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extern "C" {
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#define PATHSEP(c) ((c) == '\\' || (c) == '/')
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char *ChopFileName( char *szName, char *szShortName, ULONG dwLen)
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{
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/**************************************
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*
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* C h o p F i l e N a m e
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*
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**************************************
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*
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* Functional description
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* Try to shorten a given file name to a specified length. Put
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* in '...' where anything was taken out.
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*
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* Both szName and szShort name can be the same pointer.
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*
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* Inputs:
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* szName - Null terminated input path/filename.
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* szShortName - Output buffer for truncated path/filename.
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* dwLen - Length to truncate to.
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*
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* Outputs:
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* pointer to a buffer (szShortname).
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*
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**************************************/
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char *pchLeft, *pchRight, *pchLastRight, *pchLastLeft, *pchEnd, *pchTmp;
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BOOLEAN bLeft = TRUE, bLeftFull = FALSE, bRightFull = FALSE;
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/* Set pointers to the beginning and the end */
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pchLeft = pchEnd = szName;
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while (*pchEnd)
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pchEnd++;
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/* Check that the path is already short enough */
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if (((ULONG) (pchEnd - pchLeft)) <= dwLen) {
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pchTmp = szShortName;
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while (*pchTmp++ = *szName++);
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return szShortName;
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}
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/* Subtract the room needed for the three dots */
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dwLen -= 3;
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pchRight = pchEnd;
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pchLastLeft = pchLeft;
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pchLastRight = pchRight;
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while (!bLeftFull || !bRightFull) {
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if (bLeft) {
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while (!bLeftFull && pchLeft++ && !PATHSEP(*pchLeft)
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&& pchLeft < pchRight);
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if ((pchLeft - szName) + ((ULONG) (pchEnd - pchRight)) > dwLen) {
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bLeftFull = TRUE;
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pchLeft = pchLastLeft;
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}
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else
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pchLastLeft = pchLeft;
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}
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else {
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while (!bRightFull && pchRight-- && !PATHSEP(*pchRight)
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&& pchLeft < pchRight);
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if ((pchLeft - szName) + ((ULONG) (pchEnd - pchRight)) > dwLen) {
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bRightFull = TRUE;
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pchRight = pchLastRight;
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}
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else
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pchLastRight = pchRight;
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}
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bLeft = bLeft ? FALSE : TRUE;
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}
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for (pchTmp = szShortName, pchLeft = szName;
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pchLeft <= pchLastLeft; *pchTmp++ = *pchLeft++);
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*pchTmp++ = '.';
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*pchTmp++ = '.';
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*pchTmp++ = '.';
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for (; pchLastRight < pchEnd; *pchTmp++ = *pchLastRight++);
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*pchTmp++ = '\0';
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return szShortName;
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}
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} // extern "C"
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