mirror of https://github.com/cc65/cc65.git
147 lines
5.5 KiB
C
147 lines
5.5 KiB
C
/*****************************************************************************/
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/* */
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/* filetime.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. The problem described here:
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** http://www.codeproject.com/KB/datetime/dstbugs.aspx
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** is also true when setting file times via utime(), so we need a
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** replacement
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*/
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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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#else
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# include <sys/types.h> /* FreeBSD needs this */
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# include <utime.h>
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#endif
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/* common */
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#include "filetime.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 FILETIME* UnixTimeToFileTime (time_t T, FILETIME* FT)
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/* Calculate a FILETIME value from a time_t. 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.QuadPart = ((unsigned __int64) T + Offs.QuadPart) * 10000000U;
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FT->dwLowDateTime = V.LowPart;
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FT->dwHighDateTime = V.HighPart;
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return FT;
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}
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int SetFileTimes (const char* Path, time_t T)
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/* Set the time of last modification and the time of last access of a file to
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** the given time T. This calls utime() for system where it works, and applies
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** workarounds for all others (which in fact means "WINDOWS").
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*/
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{
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HANDLE H;
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FILETIME FileTime;
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int Error = EACCES; /* Assume an error */
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/* Open the file */
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H = CreateFile (Path,
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GENERIC_WRITE,
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FILE_SHARE_READ,
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0, /* Security attributes */
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OPEN_EXISTING,
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0, /* File flags */
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0); /* Template file */
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if (H != INVALID_HANDLE_VALUE) {
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/* Set access and modification time */
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UnixTimeToFileTime (T, &FileTime);
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if (SetFileTime (H, 0, &FileTime, &FileTime)) {
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/* Done */
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Error = 0;
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}
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/* Close the handle */
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(void) CloseHandle (H);
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}
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/* Return the error code */
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return Error;
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}
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#else
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int SetFileTimes (const char* Path, time_t T)
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/* Set the time of last modification and the time of last access of a file to
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** the given time T. This calls utime() for system where it works, and applies
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** workarounds for all others (which in fact means "WINDOWS").
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*/
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{
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struct utimbuf U;
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/* Set access and modification time */
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U.actime = T;
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U.modtime = T;
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return utime (Path, &U);
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}
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#endif
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