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Implement getcwd() for XNU

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Justine Tunney 2021-01-30 08:54:12 -08:00
parent 417797d218
commit 95173645a1
17 changed files with 239 additions and 77 deletions
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57
libc/calls/getcwd-xnu.c Normal file
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/*-*- 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 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
#define XNU_F_GETPATH 50
#define XNU_MAXPATHLEN 1024
char *getcwd$xnu(char *res, size_t size) {
int fd;
struct stat st[2];
char buf[XNU_MAXPATHLEN], *ret = NULL;
if ((fd = openat$sysv(AT_FDCWD, ".", O_RDONLY | O_DIRECTORY)) != -1) {
if (fstat$sysv(fd, &st[0]) != -1) {
if (st[0].st_dev && st[0].st_ino) {
if (fcntl$sysv(fd, XNU_F_GETPATH, buf) != -1) {
if (fstatat$sysv(AT_FDCWD, buf, &st[1], 0) != -1) {
if (st[0].st_dev == st[1].st_dev && st[0].st_ino == st[1].st_ino) {
if (memccpy(res, buf, '\0', size)) {
ret = res;
} else {
erange();
}
} else {
einval();
}
}
}
} else {
einval();
}
}
close(fd);
}
return ret;
}