posix_errno_t efile_read_info(const efile_path_t *path, int follow_links, efile_fileinfo_t *result) {
BY_HANDLE_FILE_INFORMATION native_file_info;
DWORD attributes;
int is_link;
sys_memset(&native_file_info, 0, sizeof(native_file_info));
is_link = 0;
attributes = GetFileAttributesW((WCHAR*)path->data);
if(attributes == INVALID_FILE_ATTRIBUTES) {
DWORD last_error = GetLastError();
/* Querying a network share root fails with ERROR_BAD_NETPATH, so we'll
* fake it as a directory just like local roots. */
if(!is_path_root(path) || last_error != ERROR_BAD_NETPATH) {
return windows_to_posix_errno(last_error);
}
attributes = FILE_ATTRIBUTE_DIRECTORY;
} else if(is_path_root(path)) {
/* Local (or mounted) roots can be queried with GetFileAttributesW but
* lack support for GetFileInformationByHandle, so we'll skip that
* part. */
} else {
HANDLE handle;
if(attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
is_link = is_name_surrogate(path);
}
if(follow_links && is_link) {
posix_errno_t posix_errno;
efile_path_t resolved_path;
posix_errno = internal_read_link(path, &resolved_path);
if(posix_errno != 0) {
return posix_errno;
}
return efile_read_info(&resolved_path, 0, result);
}
handle = CreateFileW((const WCHAR*)path->data, GENERIC_READ,
FILE_SHARE_FLAGS, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS,
NULL);
/* The old driver never cared whether this succeeded. */
if(handle != INVALID_HANDLE_VALUE) {
GetFileInformationByHandle(handle, &native_file_info);
CloseHandle(handle);
}
FILETIME_TO_EPOCH(result->m_time, native_file_info.ftLastWriteTime);
FILETIME_TO_EPOCH(result->a_time, native_file_info.ftLastAccessTime);
FILETIME_TO_EPOCH(result->c_time, native_file_info.ftCreationTime);
if(result->m_time == -EPOCH_DIFFERENCE) {
/* Default to 1970 just like the old driver. */
result->m_time = 0;
}
if(result->a_time == -EPOCH_DIFFERENCE) {
result->a_time = result->m_time;
}
if(result->c_time == -EPOCH_DIFFERENCE) {
result->c_time = result->m_time;
}
}
if(is_link) {
result->type = EFILE_FILETYPE_SYMLINK;
/* This should be _S_IFLNK, but the old driver always set
* non-directories to _S_IFREG. */
result->mode |= _S_IFREG;
} else if(attributes & FILE_ATTRIBUTE_DIRECTORY) {
result->type = EFILE_FILETYPE_DIRECTORY;
result->mode |= _S_IFDIR | _S_IEXEC;
} else {
if(is_executable_file(path)) {
result->mode |= _S_IEXEC;
}
result->type = EFILE_FILETYPE_REGULAR;
result->mode |= _S_IFREG;
}
if(!(attributes & FILE_ATTRIBUTE_READONLY)) {
result->access = EFILE_ACCESS_READ | EFILE_ACCESS_WRITE;
result->mode |= _S_IREAD | _S_IWRITE;
} else {
result->access = EFILE_ACCESS_READ;
result->mode |= _S_IREAD;
}
/* Propagate user mode-bits to group/other fields */
result->mode |= (result->mode & 0700) >> 3;
result->mode |= (result->mode & 0700) >> 6;
result->size =
((Uint64)native_file_info.nFileSizeHigh << 32ull) |
(Uint64)native_file_info.nFileSizeLow;
result->links = MAX(1, native_file_info.nNumberOfLinks);
result->major_device = get_drive_number(path);
result->minor_device = 0;
result->inode = 0;
result->uid = 0;
result->gid = 0;
return 0;
}
int which_main(int argc, char **argv)
{
int status;
size_t i, count;
char *path_list;
if (argc <= 1 || **(argv + 1) == '-') {
bb_show_usage();
}
argc--;
path_list = getenv("PATH");
if (path_list != NULL) {
size_t path_len = strlen(path_list);
char *new_list = NULL;
count = 1;
for (i = 0; i <= path_len; i++) {
char *this_i = &path_list[i];
if (*this_i == ':') {
/* ^::[^:] == \.: */
if (!i && (*(this_i + 1) == ':')) {
*this_i = '.';
continue;
}
*this_i = 0;
count++;
/* ^:[^:] == \.0 and [^:]::[^:] == 0\.0 and [^:]:$ == 0\.0 */
if (!i || (*(this_i + 1) == ':') || (i == path_len-1)) {
new_list = xrealloc(new_list, path_len += 1);
if (i) {
memmove(&new_list[i+2], &path_list[i+1], path_len-i);
new_list[i+1] = '.';
memmove(new_list, path_list, i);
} else {
memmove(&new_list[i+1], &path_list[i], path_len-i);
new_list[i] = '.';
}
path_list = new_list;
}
}
}
} else {
path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
count = 5;
}
status = EXIT_SUCCESS;
while (argc-- > 0) {
struct stat stat_b;
char *buf;
char *path_n;
int found = 0;
argv++;
path_n = path_list;
buf = *argv;
/* if filename is either absolute or contains slashes,
* stat it */
if (strchr(buf, '/') != NULL && is_executable_file(buf, &stat_b)) {
found++;
} else {
/* Couldn't access file and file doesn't contain slashes */
for (i = 0; i < count; i++) {
buf = concat_path_file(path_n, *argv);
if (is_executable_file(buf, &stat_b)) {
found++;
break;
}
free(buf);
path_n += (strlen(path_n) + 1);
}
}
if (found) {
puts(buf);
} else {
status = EXIT_FAILURE;
}
}
bb_fflush_stdout_and_exit(status);
}
