/*

* Copyright 2021 The Emscripten Authors. All rights reserved.

* Emscripten is available under two separate licenses, the MIT license and the

* University of Illinois/NCSA Open Source License. Both these licenses can be

* found in the LICENSE file.

*/

#include <assert.h>

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include <unistd.h>

#include <sys/stat.h>

void create_file(const char *path, const char *buffer, int mode) {

int fd = open(path, O_WRONLY | O_CREAT | O_EXCL, mode);

assert(fd >= 0);

int err = write(fd, buffer, sizeof(char) * strlen(buffer));

assert(err == (sizeof(char) * strlen(buffer)));

close(fd);

}

void setup() {

mkdir("folder", 0777);

create_file("folder/file", "abcdef", 0777);

symlink("file", "folder/file-link");

}

void test() {

int err;

struct stat s;

int fd = open(".", O_RDONLY);

assert(fd >= 0);

// missing file

err = fstatat(fd, "does_not_exist", &s, 0);

assert(err == -1);

printf("errno: %d\n", errno);

assert(errno == ENOENT);

// stat a folder

memset(&s, 0, sizeof(s));

err = fstatat(fd, "folder", &s, 0);

assert(!err);

assert(s.st_dev);

assert(s.st_ino);

assert(S_ISDIR(s.st_mode));

assert(s.st_nlink);

assert(s.st_rdev == 0);

assert(s.st_size);

assert(s.st_ctime);

#ifdef __EMSCRIPTEN__

assert(s.st_blksize == 4096);

assert(s.st_blocks == 1);

#endif

// stat a file

memset(&s, 0, sizeof(s));

err = fstatat(fd, "folder/file", &s, 0);

assert(!err);

assert(s.st_dev);

assert(s.st_ino);

assert(S_ISREG(s.st_mode));

assert(s.st_nlink);

assert(s.st_rdev == 0);

assert(s.st_size == 6);

assert(s.st_ctime);

#ifdef __EMSCRIPTEN__

assert(s.st_blksize == 4096);

assert(s.st_blocks == 1);

#endif

close(fd);

fd = open("folder", O_RDONLY);

assert(fd >= 0);

// missing file

err = fstatat(fd, "does_not_exist", &s, 0);

assert(err == -1);

assert(errno == ENOENT);

// stat a file

memset(&s, 0, sizeof(s));

err = fstatat(fd, "file", &s, 0);

assert(!err);

// empty path - not allowed

err = fstatat(fd, "", &s, 0);

assert(err == -1);

assert(errno == ENOENT);

// empty path - with AT_EMPTY_PATH (stat's the fd itself, a directory in this case)

memset(&s, 0, sizeof(s));

err = fstatat(fd, "", &s, AT_EMPTY_PATH);

assert(!err);

assert(s.st_dev);

assert(s.st_ino);

assert(S_ISDIR(s.st_mode));

assert(s.st_nlink);

assert(s.st_rdev == 0);

assert(s.st_size);

assert(s.st_ctime);

#ifdef __EMSCRIPTEN__

assert(s.st_blksize == 4096);

assert(s.st_blocks == 1);

#endif

close(fd);

fd = open("folder/file", O_RDONLY);

assert(fd >= 0);

// empty path - with AT_EMPTY_PATH (stat's the fd itself, a file)

memset(&s, 0, sizeof(s));

err = fstatat(fd, "", &s, AT_EMPTY_PATH);

assert(!err);

assert(s.st_dev);

assert(s.st_ino);

assert(S_ISREG(s.st_mode));

assert(s.st_nlink);

assert(s.st_rdev == 0);

assert(s.st_size == 6);

assert(s.st_ctime);

#ifdef __EMSCRIPTEN__

assert(s.st_blksize == 4096);

assert(s.st_blocks == 1);

#endif

close(fd);

puts("success");

}

int main() {

setup();

test();

return 0;

}