cosmopolitan/libc/calls/open.c

56 lines
3.0 KiB
C

/*-*- 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 │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
#include "libc/zipos/zipos.internal.h"
/**
* Opens file.
*
* @param file is a UTF-8 string, preferably relative w/ forward slashes
* @param flags should be O_RDONLY, O_WRONLY, or O_RDWR, and can be or'd
* with O_CREAT, O_TRUNC, O_APPEND, O_EXCL, O_CLOEXEC, O_TMPFILE
* @param mode is an octal user/group/other permission signifier, that's
* ignored if O_CREAT or O_TMPFILE weren't passed
* @return number needing close(), or -1 w/ errno
* @note don't call open() from signal handlers
*/
nodiscard int open(const char *file, int flags, ...) {
va_list va;
unsigned mode;
struct ZiposUri zipname;
va_start(va, flags);
mode = va_arg(va, unsigned);
va_end(va);
if (!file) return efault();
if (weaken(__zipos_open) && weaken(__zipos_parseuri)(file, &zipname) != -1) {
return weaken(__zipos_open)(&zipname, flags, mode);
} else if (!IsWindows()) {
return openat$sysv(AT_FDCWD, file, flags, mode);
} else {
return open$nt(file, flags, mode);
}
}