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w32: Fix qemu_ftruncate64

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SetFilePointer returns INVALID_SET_FILE_POINTER when it fails.
In addition, GetLastError must be checked.

The first call of SetFilePointer did not use INVALID_SET_FILE_POINTER,
the second call used wrong error handling.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Stefan Weil 2011-08-20 12:10:05 +02:00 committed by Anthony Liguori
parent 1f22a6bc62
commit 2c993ec294
1 changed files with 6 additions and 2 deletions
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8
block/raw-win32.c
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@ -41,6 +41,7 @@ typedef struct BDRVRawState {
int qemu_ftruncate64(int fd, int64_t length)
{
LARGE_INTEGER li;
DWORD dw;
LONG high;
HANDLE h;
BOOL res;
@ -53,12 +54,15 @@ int qemu_ftruncate64(int fd, int64_t length)
/* get current position, ftruncate do not change position */
li.HighPart = 0;
li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
return -1;
}
high = length >> 32;
if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
return -1;
}
res = SetEndOfFile(h);
/* back to old position */