mirror of
https://github.com/jart/cosmopolitan.git
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111 lines
4.8 KiB
C
111 lines
4.8 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/nt/createfile.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/creationdisposition.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filesharemode.h"
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#include "libc/sysv/consts/o.h"
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// code size optimization
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// <sync libc/sysv/consts.sh>
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#define _O_APPEND 0x00000400 // kNtFileAppendData
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#define _O_CREAT 0x00000040 // kNtOpenAlways
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#define _O_EXCL 0x00000080 // kNtCreateNew
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#define _O_TRUNC 0x00000200 // kNtCreateAlways
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#define _O_DIRECTORY 0x00010000 // kNtFileFlagBackupSemantics
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#define _O_TMPFILE 0x00410000 // AttributeTemporary|FlagDeleteOnClose
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#define _O_DIRECT 0x00004000 // kNtFileFlagNoBuffering
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#define _O_NDELAY 0x00000800 // kNtFileFlagWriteThrough
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#define _O_RANDOM 0x80000000 // kNtFileFlagRandomAccess
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#define _O_SEQUENTIAL 0x40000000 // kNtFileFlagSequentialScan
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#define _O_COMPRESSED 0x20000000 // kNtFileAttributeCompressed
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#define _O_INDEXED 0x10000000 // !kNtFileAttributeNotContentIndexed
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#define _O_NONBLOCK 0x00000800
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#define _O_CLOEXEC 0x00080000
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// </sync libc/sysv/consts.sh>
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textwindows int GetNtOpenFlags(int flags, int mode, uint32_t *out_perm,
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uint32_t *out_share, uint32_t *out_disp,
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uint32_t *out_attr) {
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uint32_t perm, share, disp, attr;
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switch (flags & O_ACCMODE) {
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case O_RDONLY:
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perm = kNtFileGenericRead | kNtGenericExecute;
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break;
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case O_WRONLY:
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perm = kNtFileGenericWrite | kNtGenericExecute;
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break;
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case O_RDWR:
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perm = kNtFileGenericRead | kNtFileGenericWrite | kNtGenericExecute;
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break;
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default:
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return -1;
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}
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if (flags & _O_APPEND) {
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perm = kNtFileAppendData;
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}
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if (flags & _O_EXCL) {
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share = kNtFileShareExclusive;
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} else {
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share = kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete;
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}
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if ((flags & _O_CREAT) && (flags & _O_EXCL)) {
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disp = kNtCreateNew;
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} else if ((flags & _O_CREAT) && (flags & _O_TRUNC)) {
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disp = kNtCreateAlways;
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} else if (flags & _O_CREAT) {
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disp = kNtOpenAlways;
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} else if (flags & _O_TRUNC) {
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disp = kNtTruncateExisting;
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} else {
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disp = kNtOpenExisting;
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}
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if ((flags & _O_TMPFILE) == _O_TMPFILE) {
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attr = kNtFileAttributeTemporary | kNtFileFlagDeleteOnClose;
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} else {
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attr = kNtFileAttributeNormal;
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if (flags & _O_DIRECTORY) {
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attr |= kNtFileFlagBackupSemantics;
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}
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if (~mode & 0200) {
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attr |= kNtFileAttributeReadonly;
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}
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}
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if (~flags & _O_INDEXED) attr |= kNtFileAttributeNotContentIndexed;
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if (flags & _O_COMPRESSED) attr |= kNtFileAttributeCompressed;
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if (flags & _O_SEQUENTIAL) attr |= kNtFileFlagSequentialScan;
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if (flags & _O_RANDOM) attr |= kNtFileFlagRandomAccess;
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if (flags & _O_DIRECT) attr |= kNtFileFlagNoBuffering;
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if (flags & _O_NDELAY) attr |= kNtFileFlagWriteThrough;
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if (out_perm) *out_perm = perm;
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if (out_share) *out_share = share;
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if (out_disp) *out_disp = disp;
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if (out_attr) *out_attr = attr;
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return 0;
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}
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