1e9f105575
* mingwex/mingw-fseek.c: The anonymous union feature for LARGE_INTEGER is
not always available, go the long way and use the explicit named union
members, which are also declared in winnt.h.
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
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* Workaround for limitations on win9x where a file contents are
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* not zero'd out if you seek past the end and then write.
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* Copied from ming local-patch to binutils/bfd/libbfd.c written by
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* Mumit Khan <khan@xraylith.wisc.edu>
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*/
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#include <windows.h>
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#include <stdio.h>
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#include <io.h>
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#include <stdlib.h>
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#define ZEROBLOCKSIZE 512
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static int __mingw_fseek_called;
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/* The fseek in Win9x runtime does not zero out the file if seeking past
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the end; if you don't want random stuff from your disk included in your
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output DLL/executable, use this version instead. On WinNT/Win2k, it
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just calls runtime fseek().
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CHECK/FIXME: Does this work for both text and binary modes?? */
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int
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__mingw_fseek (FILE *fp, long offset, int whence)
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{
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# undef fseek
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__mingw_fseek_called = 1;
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return fseek (fp, offset, whence);
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}
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int
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__mingw_fseeko64 (FILE *fp, off64_t offset, int whence)
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{
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# undef fseeko64
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__mingw_fseek_called = 1;
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return fseeko64 (fp, offset, whence);
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}
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size_t
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__mingw_fwrite (const void *buffer, size_t size, size_t count, FILE *fp)
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{
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# undef fwrite
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if ((_osver & 0x8000) && __mingw_fseek_called)
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{
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ULARGE_INTEGER actual_length;
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LARGE_INTEGER current_position = {{0LL}};
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__mingw_fseek_called = 0;
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fflush (fp);
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actual_length.u.LowPart = GetFileSize ((HANDLE) _get_osfhandle (fileno (fp)),
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&actual_length.u.HighPart);
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if (actual_length.u.LowPart == 0xFFFFFFFF
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&& GetLastError() != NO_ERROR )
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return -1;
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current_position.u.LowPart = SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
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current_position.u.LowPart,
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¤t_position.u.HighPart,
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FILE_CURRENT);
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if (current_position.u.LowPart == 0xFFFFFFFF
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&& GetLastError() != NO_ERROR )
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return -1;
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#ifdef DEBUG
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printf ("__mingw_fwrite: current %I64u, actual %I64u\n",
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current_position.QuadPart, actual_length.QuadPart);
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#endif /* DEBUG */
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if (current_position.QuadPart > actual_length.QuadPart)
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{
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static char __mingw_zeros[ZEROBLOCKSIZE];
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long long numleft;
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SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
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0, 0, FILE_END);
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numleft = current_position.QuadPart - actual_length.QuadPart;
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#ifdef DEBUG
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printf ("__mingw_fwrite: Seeking %I64d bytes past end\n", numleft);
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#endif /* DEBUG */
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while (numleft > 0LL)
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{
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DWORD nzeros = (numleft > ZEROBLOCKSIZE)
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? ZEROBLOCKSIZE : numleft;
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DWORD written;
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if (! WriteFile ((HANDLE) _get_osfhandle (fileno (fp)),
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__mingw_zeros, nzeros, &written, NULL))
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{
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/* Best we can hope for, or at least DJ says so. */
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SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
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0, 0, FILE_BEGIN);
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return -1;
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}
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if (written < nzeros)
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{
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/* Likewise. */
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SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
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0, 0, FILE_BEGIN);
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return -1;
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}
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numleft -= written;
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}
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FlushFileBuffers ((HANDLE) _get_osfhandle (fileno (fp)));
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}
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}
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return (fwrite) (buffer, size, count, fp);
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}
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