mirror of
https://github.com/jart/cosmopolitan.git
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85 lines
4 KiB
C
85 lines
4 KiB
C
/*-*- 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/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/fsid.h"
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#include "libc/calls/struct/statfs.h"
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#include "libc/calls/struct/statfs.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/enum/fsinformationclass.h"
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#include "libc/nt/enum/status.h"
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#include "libc/nt/files.h"
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#include "libc/nt/ntdll.h"
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#include "libc/nt/struct/byhandlefileinformation.h"
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#include "libc/nt/struct/filefsfullsizeinformation.h"
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#include "libc/nt/struct/iostatusblock.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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textwindows int sys_fstatfs_nt(int64_t handle, struct statfs *f) {
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uint64_t w;
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NtStatus st;
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uint32_t type;
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uint32_t h, i, j;
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struct NtIoStatusBlock io;
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struct NtFileFsFullSizeInformation fs;
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char16_t VolumeNameBuffer[261];
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uint32_t VolumeSerialNumber;
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uint32_t MaximumComponentLength;
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uint32_t FileSystemFlags;
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char16_t FileSystemNameBuffer[261];
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if (!GetVolumeInformationByHandle(
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handle, VolumeNameBuffer, ARRAYLEN(VolumeNameBuffer),
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&VolumeSerialNumber, &MaximumComponentLength, &FileSystemFlags,
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FileSystemNameBuffer, ARRAYLEN(FileSystemNameBuffer))) {
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return __winerr();
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}
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st = NtQueryVolumeInformationFile(handle, &io, &fs, sizeof(fs),
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kNtFileFsFullSizeInformation);
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if (!NtSuccess(st)) {
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if (st == kNtStatusDllNotFound) return enosys();
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return eio();
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}
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for (h = j = i = 0; FileSystemNameBuffer[i]; i++) {
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w = _tpenc(FileSystemNameBuffer[i]);
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do {
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if (j + 1 < sizeof(f->f_fstypename)) {
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h = ((unsigned)(w & 255) + h) * 0x9e3779b1u;
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f->f_fstypename[j++] = w;
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}
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} while ((w >>= 8));
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}
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f->f_fstypename[j] = 0;
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f->f_type = h;
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f->f_fsid = (fsid_t){{VolumeSerialNumber}};
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f->f_flags = FileSystemFlags;
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f->f_bsize = fs.BytesPerSector;
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f->f_bsize *= fs.SectorsPerAllocationUnit;
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f->f_frsize = f->f_bsize;
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f->f_blocks = fs.TotalAllocationUnits;
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f->f_bfree = fs.ActualAvailableAllocationUnits;
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f->f_bavail = fs.CallerAvailableAllocationUnits;
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f->f_files = INT64_MAX;
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f->f_ffree = INT64_MAX;
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f->f_namelen = 255;
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f->f_owner = 0;
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return 0;
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}
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