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Bugzilla bug #5518: map PRSeekWhence to FILE_XXX before passing to

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SetFilePointer.
Bugzilla bug #5520: correctly check for failure status of SetFilePointer
when invoked with a non-NULL third argument.
This commit is contained in:
wtc%netscape.com 1999-04-26 22:09:00 +00:00
parent d635959e46
commit 5ed7f4b11a
1 changed files with 50 additions and 24 deletions
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74
nsprpub/pr/src/md/windows/w95io.c
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@ -224,41 +224,67 @@ _PR_MD_WRITE(PRFileDesc *fd, void *buf, PRInt32 len)
PRInt32
_PR_MD_LSEEK(PRFileDesc *fd, PRInt32 offset, int whence)
{
DWORD moveMethod;
PRInt32 rv;
rv = SetFilePointer((HANDLE)fd->secret->md.osfd, offset, 0, whence);
switch (whence) {
case PR_SEEK_SET:
moveMethod = FILE_BEGIN;
break;
case PR_SEEK_CUR:
moveMethod = FILE_CURRENT;
break;
case PR_SEEK_END:
moveMethod = FILE_END;
break;
default:
PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
return -1;
}
/*
* If the lpDistanceToMoveHigh argument (third argument) is
* NULL, SetFilePointer returns 0xffffffff on failure.
*/
if (-1 == rv) {
_PR_MD_MAP_LSEEK_ERROR(GetLastError());
return -1;
} else
return rv;
rv = SetFilePointer((HANDLE)fd->secret->md.osfd, offset, NULL, moveMethod);
/*
* If the lpDistanceToMoveHigh argument (third argument) is
* NULL, SetFilePointer returns 0xffffffff on failure.
*/
if (-1 == rv) {
_PR_MD_MAP_LSEEK_ERROR(GetLastError());
}
return rv;
}
PRInt64
_PR_MD_LSEEK64(PRFileDesc *fd, PRInt64 offset, int whence)
{
PRInt64 result;
PRInt32 rv, low = (PRInt32)offset, hi = (PRInt32)(offset >> 32);
DWORD moveMethod;
LARGE_INTEGER li;
DWORD err;
rv = SetFilePointer((HANDLE)fd->secret->md.osfd, low, &hi, whence);
/*
* If the lpDistanceToMoveHigh argument (third argument) is
* NULL, SetFilePointer returns 0xffffffff on failure.
*/
if (-1 == rv)
{
_PR_MD_MAP_LSEEK_ERROR(GetLastError());
return -1;
switch (whence) {
case PR_SEEK_SET:
moveMethod = FILE_BEGIN;
break;
case PR_SEEK_CUR:
moveMethod = FILE_CURRENT;
break;
case PR_SEEK_END:
moveMethod = FILE_END;
break;
default:
PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
return -1;
}
result = (hi << 32) + rv;
return result;
li.QuadPart = offset;
li.LowPart = SetFilePointer((HANDLE)fd->secret->md.osfd,
li.LowPart, &li.HighPart, moveMethod);
if (0xffffffff == li.LowPart && (err = GetLastError()) != NO_ERROR) {
_PR_MD_MAP_LSEEK_ERROR(err);
li.QuadPart = -1;
}
return li.QuadPart;
}
/*