Commit 32f50452 by Edward Thomson

p_fallocate: add Windows emulation

Emulate `p_fallocate` on Windows by seeking beyond the end of the file
and setting the size to the current seek position.
parent 4e3949b7
......@@ -518,8 +518,54 @@ int p_creat(const char *path, mode_t mode)
int p_fallocate(int fd, off_t offset, off_t len)
{
error = ENOSYS;
return -1;
HANDLE fh = (HANDLE)_get_osfhandle(fd);
LARGE_INTEGER zero, position, oldsize, newsize;
size_t size;
if (fh == INVALID_HANDLE_VALUE) {
errno = EBADF;
return -1;
}
if (offset < 0 || len <= 0) {
errno = EINVAL;
return -1;
}
if (git__add_sizet_overflow(&size, offset, len)) {
errno = EINVAL;
return -1;
}
zero.u.LowPart = 0;
zero.u.HighPart = 0;
newsize.u.LowPart = (size & 0xffffffff);
#if (SIZE_MAX > UINT32_MAX)
newsize.u.HighPart = size >> 32;
#else
newsize.u.HighPart = 0;
#endif
if (!GetFileSizeEx(fh, &oldsize)) {
set_errno();
return -1;
}
/* POSIX emulation: attempting to shrink the file is ignored */
if (oldsize.QuadPart >= newsize.QuadPart)
return 0;
if (!SetFilePointerEx(fh, zero, &position, FILE_CURRENT) ||
!SetFilePointerEx(fh, newsize, NULL, FILE_BEGIN) ||
!SetEndOfFile(fh) ||
!SetFilePointerEx(fh, position, 0, FILE_BEGIN)) {
set_errno();
return -1;
}
return 0;
}
int p_utimes(const char *path, const struct p_timeval times[2])
......
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