blob: 3ae7d8567418a16a3812edb78e3e0e22d20810f8 [file] [log] [blame]
/**
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <windows.h>
#include <stdio.h>
#include <io.h>
#include <stdlib.h>
#define ZEROBLOCKSIZE 512
static int __mingw_fseek_called;
int __mingw_fseek (FILE *fp, int offset, int whence);
int
__mingw_fseek (FILE *fp, int offset, int whence)
{
# undef fseek
__mingw_fseek_called = 1;
return fseek (fp, offset, whence);
}
int __mingw_fseeko64 (FILE *fp, long offset, int whence);
int
__mingw_fseeko64 (FILE *fp, long offset, int whence)
{
# undef fseeko64
__mingw_fseek_called = 1;
return fseeko64 (fp, offset, whence);
}
size_t __mingw_fwrite (const void *buffer, size_t size, size_t count, FILE *fp);
size_t
__mingw_fwrite (const void *buffer, size_t size, size_t count, FILE *fp)
{
# undef fwrite
if ((_osver & 0x8000) && __mingw_fseek_called)
{
ULARGE_INTEGER actual_length;
LARGE_INTEGER current_position;
memset (&current_position, 0, sizeof (LARGE_INTEGER));
__mingw_fseek_called = 0;
fflush (fp);
actual_length.LowPart = GetFileSize ((HANDLE) _get_osfhandle (fileno (fp)),
&actual_length.HighPart);
if (actual_length.LowPart == 0xFFFFFFFF
&& GetLastError() != NO_ERROR )
return -1;
current_position.LowPart = SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
current_position.LowPart,
&current_position.HighPart,
FILE_CURRENT);
if (current_position.LowPart == 0xFFFFFFFF
&& GetLastError() != NO_ERROR )
return -1;
#ifdef DEBUG
printf ("__mingw_fwrite: current %I64u, actual %I64u\n",
current_position.QuadPart, actual_length.QuadPart);
#endif /* DEBUG */
if ((size_t)current_position.QuadPart > (size_t)actual_length.QuadPart)
{
static char __mingw_zeros[ZEROBLOCKSIZE];
long long numleft;
SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
0, 0, FILE_END);
numleft = current_position.QuadPart - actual_length.QuadPart;
#ifdef DEBUG
printf ("__mingw_fwrite: Seeking %I64d bytes past end\n", numleft);
#endif /* DEBUG */
while (numleft > 0LL)
{
DWORD nzeros = (numleft > ZEROBLOCKSIZE)
? ZEROBLOCKSIZE : numleft;
DWORD written;
if (! WriteFile ((HANDLE) _get_osfhandle (fileno (fp)),
__mingw_zeros, nzeros, &written, NULL))
{
/* Best we can hope for, or at least DJ says so. */
SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
0, 0, FILE_BEGIN);
return -1;
}
if (written < nzeros)
{
/* Likewise. */
SetFilePointer ((HANDLE) _get_osfhandle (fileno (fp)),
0, 0, FILE_BEGIN);
return -1;
}
numleft -= written;
}
FlushFileBuffers ((HANDLE) _get_osfhandle (fileno (fp)));
}
}
return fwrite (buffer, size, count, fp);
}