1 /*****************************************************************************/
5 /* Replacement for buggy Microsoft code */
9 /* (C) 2012, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
36 /* This module works around bugs in the time conversion code supplied by
37 * Microsoft. See here for a description of the problem:
38 * http://www.codeproject.com/KB/datetime/dstbugs.aspx
39 * Please let me note that I find it absolutely unacceptable to just declare
40 * buggy behaviour like this "works as designed" as Microsoft does. The
41 * problems did even make it into .NET, where the DateTime builtin data type
42 * has exactly the same problems as described in the article above.
47 #include <sys/types.h>
49 #if defined(__WATCOMC__) && defined(__NT__)
60 /*****************************************************************************/
62 /*****************************************************************************/
70 static time_t FileTimeToUnixTime (const FILETIME* T)
71 /* Calculate a unix time_t value from a FILETIME. FILETIME contains a 64 bit
72 * value with point zero at 1600-01-01 00:00:00 and counting 100ns intervals.
73 * time_t is in seconds since 1970-01-01 00:00:00.
76 /* Offset between 1600-01-01 and the Epoch in seconds. Watcom C has no
77 * way to express a number > 32 bit (known to me) but is able to do
78 * calculations with 64 bit integers, so we need to do it this way.
80 static const ULARGE_INTEGER Offs = { 0xB6109100UL, 0x00000020UL };
82 V.LowPart = T->dwLowDateTime;
83 V.HighPart = T->dwHighDateTime;
84 return (V.QuadPart / 10000000U) - Offs.QuadPart;
89 int FileStat (const char* Path, struct stat* Buf)
90 /* Replacement function for stat() */
94 BY_HANDLE_FILE_INFORMATION Info;
96 /* First call stat() */
97 int Error = stat (Path, Buf);
102 /* Open the file using backup semantics, so we won't change atime. Then
103 * retrieve the correct times in UTC and replace the ones in Buf. Return
104 * EACCES in case of errors to avoid the hassle of translating windows
105 * error codes to standard ones.
107 H = CreateFile (Path,
110 0, /* Security attributes */
112 FILE_FLAG_BACKUP_SEMANTICS,
113 0); /* Template file */
114 if (H != INVALID_HANDLE_VALUE) {
115 if (GetFileInformationByHandle (H, &Info)) {
116 Buf->st_ctime = FileTimeToUnixTime (&Info.ftCreationTime);
117 Buf->st_atime = FileTimeToUnixTime (&Info.ftLastAccessTime);
118 Buf->st_mtime = FileTimeToUnixTime (&Info.ftLastWriteTime);
122 (void) CloseHandle (H);
137 int FileStat (const char* Path, struct stat* Buf)
138 /* Replacement function for stat() */
140 /* Just call the function which works without errors */
141 return stat (Path, Buf);