cosmopolitan/libc/calls/ftruncate-nt.c

38 lines
2.4 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/nt/enum/filemovemethod.h"
#include "libc/nt/files.h"
#include "libc/sysv/errfuns.h"
textwindows int ftruncate$nt(int fd, uint64_t length) {
bool32 ok;
int64_t tell;
if (!__isfdkind(fd, kFdFile)) return ebadf();
tell = -1;
if (SetFilePointerEx(g_fds.p[fd].handle, 0, &tell, kNtFileCurrent)) {
ok = SetFilePointerEx(g_fds.p[fd].handle, length, NULL, kNtFileBegin) &&
SetEndOfFile(g_fds.p[fd].handle);
SetFilePointerEx(g_fds.p[fd].handle, tell, NULL, kNtFileBegin);
return ok ? 0 : __winerr();
} else {
return __winerr();
}
}