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https://github.com/jart/cosmopolitan.git
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a5c0189bf6
It appears that GetFileAttributes(u"\\etc\\passwd") can take two seconds on Windows 10 at unpredictable times for reasons which are mysterious to me. Let's try avoiding that path entirely and pray to Microsoft it works
77 lines
3.8 KiB
C
77 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/errno.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/files.h"
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#include "libc/str/str.h"
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static int IsAlpha(int c) {
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return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
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}
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static textwindows bool SubpathExistsThatsNotDirectory(char16_t *path) {
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char16_t *p;
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uint32_t attrs;
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while ((p = strrchr16(path, '\\'))) {
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if (p == path)
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// don't bother checking GetFileAttributes(u"\\")
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break;
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if (p == path + 2 && IsAlpha(path[0]) && path[1] == ':')
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// don't bother checking GetFileAttributes(u"C:\\")
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break;
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*p = u'\0';
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if ((attrs = GetFileAttributes(path)) != -1u &&
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!(attrs & kNtFileAttributeDirectory)) {
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return true;
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}
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}
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return false;
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}
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textwindows dontinline int64_t __fix_enotdir3(int64_t rc, char16_t *path1,
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char16_t *path2) {
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if (rc == -1 && (errno == kNtErrorPathNotFound || // Windows returns ENOTDIR
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errno == kNtErrorInvalidName)) { // e.g. has trailing slash
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bool isdir = false;
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if ((!path1 || !(isdir |= SubpathExistsThatsNotDirectory(path1))) &&
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(!path2 || !(isdir |= SubpathExistsThatsNotDirectory(path2)))) {
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errno = kNtErrorFileNotFound; // ENOENT
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} else if (isdir) {
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errno = kNtErrorPathNotFound; // ENOTDIR
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}
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}
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return rc;
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}
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// WIN32 doesn't distinguish between ENOTDIR and ENOENT. UNIX strictly
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// requires that a directory component *exists* but is not a directory
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// whereas WIN32 will return ENOTDIR if a dir label simply isn't found
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//
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// - ENOTDIR: A component used as a directory in pathname is not, in
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// fact, a directory. -or- pathname is relative and dirfd is a file
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// descriptor referring to a file other than a directory.
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//
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// - ENOENT: A directory component in pathname does not exist or is a
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// dangling symbolic link.
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//
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textwindows int64_t __fix_enotdir(int64_t rc, char16_t *path) {
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return __fix_enotdir3(rc, path, 0);
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}
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