89 lines
2.6 KiB
C
89 lines
2.6 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_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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DWORD actual_length, current_position;
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__mingw_fseek_called = 0;
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fflush (fp);
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actual_length = GetFileSize ((HANDLE) _get_osfhandle (fileno (fp)),
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NULL);
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current_position = SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
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0, 0, FILE_CURRENT);
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#ifdef DEBUG
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printf ("__mingw_fwrite: current %ld, actual %ld\n",
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current_position, actual_length);
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#endif /* DEBUG */
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if (current_position > actual_length)
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{
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static char __mingw_zeros[ZEROBLOCKSIZE];
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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 - actual_length;
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#ifdef DEBUG
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printf ("__mingw_fwrite: Seeking %ld bytes past end\n", numleft);
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#endif /* DEBUG */
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while (numleft > 0)
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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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