85 lines
4.1 KiB
C
85 lines
4.1 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 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/calls/ntmagicpaths.internal.h"
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#include "libc/str/oldutf16.internal.h"
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#include "libc/str/str.h"
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#include "libc/str/tpdecode.internal.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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textwindows static const char *FixNtMagicPath(const char *path,
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unsigned flags) {
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const struct NtMagicPaths *mp = &kNtMagicPaths;
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asm("" : "+r"(mp));
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if (path[0] != '/') return path;
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if (strcmp(path, mp->devtty) == 0) {
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if ((flags & O_ACCMODE) == O_RDONLY) {
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return mp->conin;
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} else if ((flags & O_ACCMODE) == O_WRONLY) {
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return mp->conout;
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}
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}
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if (strcmp(path, mp->devnull) == 0) return mp->nul;
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if (strcmp(path, mp->devstdin) == 0) return mp->conin;
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if (strcmp(path, mp->devstdout) == 0) return mp->conout;
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return path;
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}
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textwindows int __mkntpath(const char *path,
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char16_t path16[hasatleast PATH_MAX - 16]) {
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return __mkntpath2(path, path16, -1);
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}
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/**
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* Copies path for Windows NT.
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*
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* This entails (1) UTF-8 to UTF-16 conversion; (2) replacing
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* forward-slashes with backslashes; and (3) remapping several
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* well-known paths (e.g. /dev/null → NUL) for convenience.
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*
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* @param flags is used by open()
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* @param path16 is shortened so caller can prefix, e.g. \\.\pipe\, and
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* due to a plethora of special-cases throughout the Win32 API
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* @return short count excluding NUL on success, or -1 w/ errno
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* @error ENAMETOOLONG
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*/
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textwindows int __mkntpath2(const char *path,
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char16_t path16[hasatleast PATH_MAX - 16],
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int flags) {
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/*
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* 1. Reserve +1 for NUL-terminator
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* 2. Reserve +1 for UTF-16 overflow
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* 3. Reserve ≥2 for SetCurrentDirectory trailing slash requirement
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* 4. Reserve ≥10 for CreateNamedPipe "\\.\pipe\" prefix requirement
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* 5. Reserve ≥13 for mkdir() i.e. 1+8+3+1, e.g. "\\ffffffff.xxx\0"
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*/
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size_t i, n;
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path = FixNtMagicPath(path, flags);
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n = tprecode8to16(path16, PATH_MAX - 16, path).ax;
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if (n == PATH_MAX - 16 - 1) return enametoolong();
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for (i = 0; i < n; ++i) {
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if (path16[i] == '/') {
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path16[i] = '\\';
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}
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}
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return n;
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}
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