mirror of
https://github.com/jart/cosmopolitan.git
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2046c0d2ae
- Expand redbean UNIX module - Expand redbean documentation - Ensure Lua copyright is embedded in binary - Increase the PATH_MAX limit especially on NT - Use column major sorting for linenoise completions - Fix some suboptimalities in redbean's new UNIX API - Figured out right flags for Multics newline in raw mode
82 lines
3.5 KiB
C
82 lines
3.5 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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│ 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/bits/weaken.h"
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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/strace.internal.h"
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#include "libc/calls/struct/metastat.internal.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/nt/files.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Returns true if file exists at path.
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*
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* This function is equivalent to:
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*
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* struct stat st;
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* return stat(path, &st) != -1;
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*
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* Please note that things which aren't strictly files, e.g. directories
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* or sockets, could be considered files for the purposes of this
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* function. The stat() function may be used to differentiate them.
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*/
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bool fileexists(const char *path) {
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int e;
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bool res;
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union metastat st;
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struct ZiposUri zipname;
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uint16_t path16[PATH_MAX + 1];
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e = errno;
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if (IsAsan() && !__asan_is_valid(path, 1)) {
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efault();
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res = false;
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} else if (weaken(__zipos_open) &&
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weaken(__zipos_parseuri)(path, &zipname) != -1) {
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if (weaken(__zipos_stat)(&zipname, &st.cosmo) != -1) {
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res = true;
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} else {
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res = false;
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}
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} else if (IsMetal()) {
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res = false;
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} else if (!IsWindows()) {
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if (__sys_fstatat(AT_FDCWD, path, &st, 0) != -1) {
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res = true;
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} else {
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res = false;
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}
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} else if (__mkntpath(path, path16) != -1) {
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res = GetFileAttributes(path16) != -1u;
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} else {
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res = false;
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}
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STRACE("%s(%#s) → %hhhd% m", "fileexists", path, res);
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if (!res && (errno == ENOENT || errno == ENOTDIR)) {
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errno = e;
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}
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return res;
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}
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