mirror of https://github.com/cc65/cc65.git
146 lines
5.6 KiB
C
146 lines
5.6 KiB
C
/*****************************************************************************/
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/* */
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/* filestat.c */
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/* */
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/* Replacement for Windows code */
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/* */
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/* */
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/* */
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/* (C) 2012, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/* This module works around bugs in the time conversion code supplied by
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** Microsoft. See here for a description of the problem:
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** http://www.codeproject.com/KB/datetime/dstbugs.aspx
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** Please let me note that I find it absolutely unacceptable to just declare
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** buggy behaviour like this "works as designed" as Microsoft does. The
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** problems did even make it into .NET, where the DateTime builtin data type
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** has exactly the same problems as described in the article above.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#if defined(_WIN32)
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# include <errno.h>
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# include <windows.h>
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#endif
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/* common */
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#include "filestat.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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#if defined(_WIN32)
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static time_t FileTimeToUnixTime (const FILETIME* T)
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/* Calculate a unix time_t value from a FILETIME. FILETIME contains a 64 bit
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** value with point zero at 1600-01-01 00:00:00 and counting 100ns intervals.
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** time_t is in seconds since 1970-01-01 00:00:00.
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*/
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{
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/* Offset between 1600-01-01 and the Epoch in seconds. Watcom C has no
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** way to express a number > 32 bit (known to me) but is able to do
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** calculations with 64 bit integers, so we need to do it this way.
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*/
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static const ULARGE_INTEGER Offs = { { 0xB6109100UL, 0x00000020UL } };
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ULARGE_INTEGER V;
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V.LowPart = T->dwLowDateTime;
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V.HighPart = T->dwHighDateTime;
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return (V.QuadPart / 10000000U) - Offs.QuadPart;
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}
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int FileStat (const char* Path, struct stat* Buf)
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/* Replacement function for stat() */
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{
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HANDLE H;
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BY_HANDLE_FILE_INFORMATION Info;
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/* First call stat() */
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int Error = stat (Path, Buf);
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if (Error != 0) {
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return Error;
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}
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/* Open the file using backup semantics, so we won't change atime. Then
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** retrieve the correct times in UTC and replace the ones in Buf. Return
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** EACCES in case of errors to avoid the hassle of translating windows
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** error codes to standard ones.
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*/
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H = CreateFile (Path,
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GENERIC_READ,
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FILE_SHARE_READ,
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0, /* Security attributes */
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OPEN_EXISTING,
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FILE_FLAG_BACKUP_SEMANTICS,
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0); /* Template file */
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if (H != INVALID_HANDLE_VALUE) {
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if (GetFileInformationByHandle (H, &Info)) {
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Buf->st_ctime = FileTimeToUnixTime (&Info.ftCreationTime);
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Buf->st_atime = FileTimeToUnixTime (&Info.ftLastAccessTime);
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Buf->st_mtime = FileTimeToUnixTime (&Info.ftLastWriteTime);
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} else {
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Error = EACCES;
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}
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(void) CloseHandle (H);
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} else {
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Error = EACCES;
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}
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/* Done */
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return Error;
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}
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#else
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int FileStat (const char* Path, struct stat* Buf)
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/* Replacement function for stat() */
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{
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/* Just call the function which works without errors */
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return stat (Path, Buf);
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}
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#endif
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