/*-*- 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/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/stat.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/fmt/wintime.internal.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/bsr.h"
#include "libc/intrin/strace.internal.h"
#include "libc/macros.internal.h"
#include "libc/mem/alloca.h"
#include "libc/nt/enum/fileflagandattributes.h"
#include "libc/nt/enum/fileinfobyhandleclass.h"
#include "libc/nt/enum/filetype.h"
#include "libc/nt/enum/fsctl.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/byhandlefileinformation.h"
#include "libc/nt/struct/filecompressioninfo.h"
#include "libc/nt/struct/reparsedatabuffer.h"
#include "libc/str/str.h"
#include "libc/str/utf16.h"
#include "libc/sysv/consts/s.h"
#include "libc/sysv/errfuns.h"
static textwindows long GetSizeOfReparsePoint(int64_t fh) {
uint32_t mem =
sizeof(struct NtReparseDataBuffer) + PATH_MAX * sizeof(char16_t);
void *buf = alloca(mem);
uint32_t dwBytesReturned;
struct NtReparseDataBuffer *rdb = (struct NtReparseDataBuffer *)buf;
if (!DeviceIoControl(fh, kNtFsctlGetReparsePoint, 0, 0, rdb, mem,
&dwBytesReturned, 0)) {
return -1;
}
const char16_t *p =
(const char16_t *)((char *)rdb->SymbolicLinkReparseBuffer.PathBuffer +
rdb->SymbolicLinkReparseBuffer.PrintNameOffset);
uint32_t n =
rdb->SymbolicLinkReparseBuffer.PrintNameLength / sizeof(char16_t);
uint32_t i = 0;
uint32_t z = 0;
while (i < n) {
wint_t x = p[i++] & 0xffff;
if (!IsUcs2(x)) {
if (i < n) {
wint_t y = p[i++] & 0xffff;
x = MergeUtf16(x, y);
} else {
x = 0xfffd;
}
}
if (x >= 0200) {
z += _bsrl(tpenc(x)) >> 3;
}
++z;
}
return z;
}
static textwindows int sys_fstat_nt_socket(int kind, struct stat *st) {
bzero(st, sizeof(*st));
st->st_blksize = 512;
st->st_mode = S_IFSOCK | 0666;
st->st_dev = 0x44444444;
st->st_ino = kind;
return 0;
}
textwindows int sys_fstat_nt_special(int kind, struct stat *st) {
bzero(st, sizeof(*st));
st->st_blksize = 512;
st->st_mode = S_IFCHR | 0666;
st->st_dev = 0x77777777;
st->st_ino = kind;
return 0;
}
textwindows int sys_fstat_nt(int fd, struct stat *st) {
if (fd + 0u >= g_fds.n) return ebadf();
switch (g_fds.p[fd].kind) {
case kFdEmpty:
return ebadf();
case kFdConsole:
case kFdDevNull:
return sys_fstat_nt_special(g_fds.p[fd].kind, st);
case kFdSocket:
return sys_fstat_nt_socket(g_fds.p[fd].kind, st);
default:
return sys_fstat_nt_handle(g_fds.p[fd].handle, 0, st);
}
}
textwindows int sys_fstat_nt_handle(int64_t handle, const char16_t *path,
struct stat *out_st) {
struct stat st = {0};
// Always set st_blksize to avoid divide by zero issues.
// The Linux kernel sets this for /dev/tty and similar too.
// TODO(jart): GetVolumeInformationByHandle?
st.st_blksize = 4096;
st.st_gid = st.st_uid = sys_getuid_nt();
// We'll use the "umask" to fake out the mode bits.
uint32_t umask = atomic_load_explicit(&__umask, memory_order_acquire);
switch (GetFileType(handle)) {
case kNtFileTypeUnknown:
break;
case kNtFileTypeChar:
st.st_mode = S_IFCHR | (0666 & ~umask);
st.st_dev = 0x66666666;
st.st_ino = handle;
break;
case kNtFileTypePipe:
st.st_mode = S_IFIFO | (0666 & ~umask);
st.st_dev = 0x55555555;
st.st_ino = handle;
break;
case kNtFileTypeDisk: {
struct NtByHandleFileInformation wst;
if (!GetFileInformationByHandle(handle, &wst)) {
return __winerr();
}
st.st_mode = 0444 & ~umask;
if ((wst.dwFileAttributes & kNtFileAttributeDirectory) ||
IsWindowsExecutable(handle, path)) {
st.st_mode |= 0111 & ~umask;
}
st.st_flags = wst.dwFileAttributes;
if (!(wst.dwFileAttributes & kNtFileAttributeReadonly)) {
st.st_mode |= 0222 & ~umask;
}
if (wst.dwFileAttributes & kNtFileAttributeReparsePoint) {
st.st_mode |= S_IFLNK;
} else if (wst.dwFileAttributes & kNtFileAttributeDirectory) {
st.st_mode |= S_IFDIR;
} else {
st.st_mode |= S_IFREG;
}
st.st_atim = FileTimeToTimeSpec(wst.ftLastAccessFileTime);
st.st_mtim = FileTimeToTimeSpec(wst.ftLastWriteFileTime);
st.st_birthtim = FileTimeToTimeSpec(wst.ftCreationFileTime);
// compute time of last status change
if (timespec_cmp(st.st_atim, st.st_mtim) > 0) {
st.st_ctim = st.st_atim;
} else {
st.st_ctim = st.st_mtim;
}
st.st_size = (wst.nFileSizeHigh + 0ull) << 32 | wst.nFileSizeLow;
st.st_dev = wst.dwVolumeSerialNumber;
st.st_ino = (wst.nFileIndexHigh + 0ull) << 32 | wst.nFileIndexLow;
st.st_nlink = wst.nNumberOfLinks;
if (S_ISLNK(st.st_mode)) {
if (!st.st_size) {
long size = GetSizeOfReparsePoint(handle);
if (size == -1) return -1;
st.st_size = size;
}
} else {
// st_size = uncompressed size
// st_blocks*512 = physical size
uint64_t physicalsize;
struct NtFileCompressionInfo fci;
if (!(wst.dwFileAttributes &
(kNtFileAttributeDirectory | kNtFileAttributeReparsePoint)) &&
GetFileInformationByHandleEx(handle, kNtFileCompressionInfo, &fci,
sizeof(fci))) {
physicalsize = fci.CompressedFileSize;
} else {
physicalsize = st.st_size;
}
st.st_blocks = ROUNDUP(physicalsize, st.st_blksize) / 512;
}
break;
}
default:
__builtin_unreachable();
}
memcpy(out_st, &st, sizeof(st));
return 0;
}