mirror of
https://github.com/jart/cosmopolitan.git
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104 lines
4.3 KiB
C
104 lines
4.3 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 2021 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/syscall_support-nt.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/tpenc.h"
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#include "libc/mem/alloca.h"
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#include "libc/nt/createfile.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/fsctl.h"
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#include "libc/nt/enum/io.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/reparsedatabuffer.h"
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#include "libc/runtime/stack.h"
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#include "libc/str/str.h"
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#include "libc/str/utf16.h"
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#include "libc/sysv/errfuns.h"
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textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
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size_t bufsiz) {
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int64_t h;
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ssize_t rc;
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uint64_t w;
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wint_t x, y;
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volatile char *memory;
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uint32_t i, j, n, mem;
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char16_t path16[PATH_MAX], *p;
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struct NtReparseDataBuffer *rdb;
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if (__mkntpathat(dirfd, path, 0, path16) == -1) return -1;
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mem = 16384;
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memory = alloca(mem);
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CheckLargeStackAllocation(memory, mem);
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rdb = (struct NtReparseDataBuffer *)memory;
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if ((h = CreateFile(path16, 0, 0, 0, kNtOpenExisting,
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kNtFileFlagOpenReparsePoint | kNtFileFlagBackupSemantics,
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0)) != -1) {
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if (DeviceIoControl(h, kNtFsctlGetReparsePoint, 0, 0, rdb, mem, &n, 0)) {
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if (rdb->ReparseTag == kNtIoReparseTagSymlink) {
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i = 0;
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j = 0;
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n = rdb->SymbolicLinkReparseBuffer.PrintNameLength / sizeof(char16_t);
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p = (char16_t *)((char *)rdb->SymbolicLinkReparseBuffer.PathBuffer +
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rdb->SymbolicLinkReparseBuffer.PrintNameOffset);
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if (n >= 3 && isalpha(p[0]) && p[1] == ':' && p[2] == '\\') {
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p[1] = p[0];
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p[0] = '/';
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p[2] = '/';
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}
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while (i < n) {
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x = p[i++] & 0xffff;
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if (!IsUcs2(x)) {
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if (i < n) {
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y = p[i++] & 0xffff;
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x = MergeUtf16(x, y);
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} else {
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x = 0xfffd;
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}
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}
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if (x < 0200) {
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if (x == '\\') {
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x = '/';
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}
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w = x;
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} else {
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w = _tpenc(x);
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}
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do {
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if (j < bufsiz) {
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buf[j++] = w;
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}
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w >>= 8;
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} while (w);
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}
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rc = j;
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} else {
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NTTRACE("sys_readlinkat_nt() should have kNtIoReparseTagSymlink");
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rc = einval();
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}
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} else {
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rc = -1;
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}
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CloseHandle(h);
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} else {
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rc = __fix_enotdir(-1, path16);
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}
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return rc;
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}
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