#include "libbb.h"

unsigned int _CRT_fmode = _O_BINARY;

static int err_win_to_posix(DWORD winerr)
{
	int error = ENOSYS;
	switch(winerr) {
	case ERROR_ACCESS_DENIED: error = EACCES; break;
	case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
	case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
	case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
	case ERROR_ALREADY_EXISTS: error = EEXIST; break;
	case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
	case ERROR_BAD_COMMAND: error = EIO; break;
	case ERROR_BAD_DEVICE: error = ENODEV; break;
	case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
	case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
	case ERROR_BAD_FORMAT: error = ENOEXEC; break;
	case ERROR_BAD_LENGTH: error = EINVAL; break;
	case ERROR_BAD_PATHNAME: error = ENOENT; break;
	case ERROR_BAD_PIPE: error = EPIPE; break;
	case ERROR_BAD_UNIT: error = ENODEV; break;
	case ERROR_BAD_USERNAME: error = EINVAL; break;
	case ERROR_BROKEN_PIPE: error = EPIPE; break;
	case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
	case ERROR_BUSY: error = EBUSY; break;
	case ERROR_BUSY_DRIVE: error = EBUSY; break;
	case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
	case ERROR_CANNOT_MAKE: error = EACCES; break;
	case ERROR_CANTOPEN: error = EIO; break;
	case ERROR_CANTREAD: error = EIO; break;
	case ERROR_CANTWRITE: error = EIO; break;
	case ERROR_CRC: error = EIO; break;
	case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
	case ERROR_DEVICE_IN_USE: error = EBUSY; break;
	case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
	case ERROR_DIRECTORY: error = EINVAL; break;
	case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
	case ERROR_DISK_CHANGE: error = EIO; break;
	case ERROR_DISK_FULL: error = ENOSPC; break;
	case ERROR_DRIVE_LOCKED: error = EBUSY; break;
	case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
	case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
	case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
	case ERROR_FILE_EXISTS: error = EEXIST; break;
	case ERROR_FILE_INVALID: error = ENODEV; break;
	case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
	case ERROR_GEN_FAILURE: error = EIO; break;
	case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
	case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
	case ERROR_INVALID_ACCESS: error = EACCES; break;
	case ERROR_INVALID_ADDRESS: error = EFAULT; break;
	case ERROR_INVALID_BLOCK: error = EFAULT; break;
	case ERROR_INVALID_DATA: error = EINVAL; break;
	case ERROR_INVALID_DRIVE: error = ENODEV; break;
	case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
	case ERROR_INVALID_FLAGS: error = EINVAL; break;
	case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
	case ERROR_INVALID_HANDLE: error = EBADF; break;
	case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
	case ERROR_INVALID_NAME: error = EINVAL; break;
	case ERROR_INVALID_OWNER: error = EINVAL; break;
	case ERROR_INVALID_PARAMETER: error = EINVAL; break;
	case ERROR_INVALID_PASSWORD: error = EPERM; break;
	case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
	case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
	case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
	case ERROR_INVALID_WORKSTATION: error = EACCES; break;
	case ERROR_IO_DEVICE: error = EIO; break;
	case ERROR_IO_INCOMPLETE: error = EINTR; break;
	case ERROR_LOCKED: error = EBUSY; break;
	case ERROR_LOCK_VIOLATION: error = EACCES; break;
	case ERROR_LOGON_FAILURE: error = EACCES; break;
	case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
	case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
	case ERROR_MORE_DATA: error = EPIPE; break;
	case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
	case ERROR_NOACCESS: error = EFAULT; break;
	case ERROR_NONE_MAPPED: error = EINVAL; break;
	case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
	case ERROR_NOT_READY: error = EAGAIN; break;
	case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
	case ERROR_NO_DATA: error = EPIPE; break;
	case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
	case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
	case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
	case ERROR_OPEN_FAILED: error = EIO; break;
	case ERROR_OPEN_FILES: error = EBUSY; break;
	case ERROR_OPERATION_ABORTED: error = EINTR; break;
	case ERROR_OUTOFMEMORY: error = ENOMEM; break;
	case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
	case ERROR_PATH_BUSY: error = EBUSY; break;
	case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
	case ERROR_PIPE_BUSY: error = EBUSY; break;
	case ERROR_PIPE_CONNECTED: error = EPIPE; break;
	case ERROR_PIPE_LISTENING: error = EPIPE; break;
	case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
	case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
	case ERROR_READ_FAULT: error = EIO; break;
	case ERROR_SEEK: error = EIO; break;
	case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
	case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
	case ERROR_SHARING_VIOLATION: error = EACCES; break;
	case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
	case ERROR_SWAPERROR: error = ENOENT; break;
	case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
	case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
	case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
	case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
	case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
	case ERROR_WRITE_FAULT: error = EIO; break;
	case ERROR_WRITE_PROTECT: error = EROFS; break;
	}
	return error;
}

#undef open
int mingw_open (const char *filename, int oflags, ...)
{
	va_list args;
	unsigned mode;
	int fd;

	va_start(args, oflags);
	mode = va_arg(args, int);
	va_end(args);

	if (oflags & O_NONBLOCK) {
		errno = ENOSYS;
		return -1;
	}
	if (!strcmp(filename, "/dev/null"))
		filename = "nul";
	fd = open(filename, oflags, mode);
	if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
		DWORD attrs = GetFileAttributes(filename);
		if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
			errno = EISDIR;
	}
	return fd;
}

#undef fopen
FILE *mingw_fopen (const char *filename, const char *mode)
{
	if (!strcmp(filename, "/dev/null"))
		filename = "nul";
	return fopen(filename, mode);
}

#undef dup2
int mingw_dup2 (int fd, int fdto)
{
	int ret = dup2(fd, fdto);
	return ret != -1 ? fdto : -1;
}

static inline time_t filetime_to_time_t(const FILETIME *ft)
{
	long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
	winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
	winTime /= 10000000;		 /* Nano to seconds resolution */
	return (time_t)winTime;
}

static inline int file_attr_to_st_mode (DWORD attr)
{
	int fMode = S_IREAD;
	if (attr & FILE_ATTRIBUTE_DIRECTORY)
		fMode |= S_IFDIR;
	else
		fMode |= S_IFREG;
	if (!(attr & FILE_ATTRIBUTE_READONLY))
		fMode |= S_IWRITE;
	return fMode;
}

static inline int get_file_attr(const char *fname, WIN32_FILE_ATTRIBUTE_DATA *fdata)
{
	if (GetFileAttributesExA(fname, GetFileExInfoStandard, fdata))
		return 0;

	switch (GetLastError()) {
	case ERROR_ACCESS_DENIED:
	case ERROR_SHARING_VIOLATION:
	case ERROR_LOCK_VIOLATION:
	case ERROR_SHARING_BUFFER_EXCEEDED:
		return EACCES;
	case ERROR_BUFFER_OVERFLOW:
		return ENAMETOOLONG;
	case ERROR_NOT_ENOUGH_MEMORY:
		return ENOMEM;
	default:
		return ENOENT;
	}
}

/* We keep the do_lstat code in a separate function to avoid recursion.
 * When a path ends with a slash, the stat will fail with ENOENT. In
 * this case, we strip the trailing slashes and stat again.
 */
static int do_lstat(const char *file_name, struct stat *buf)
{
	WIN32_FILE_ATTRIBUTE_DATA fdata;

	if (!(errno = get_file_attr(file_name, &fdata))) {
		int len = strlen(file_name);

		buf->st_ino = 0;
		buf->st_gid = 0;
		buf->st_uid = 0;
		buf->st_nlink = 1;
		buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
		if (len > 4 && !strcmp(file_name+len-4, ".exe"))
			buf->st_mode |= S_IEXEC;
		buf->st_size = fdata.nFileSizeLow |
			(((off64_t)fdata.nFileSizeHigh)<<32);
		buf->st_dev = buf->st_rdev = 0; /* not used by Git */
		buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
		buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
		buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
		return 0;
	}
	return -1;
}

/* We provide our own lstat/fstat functions, since the provided
 * lstat/fstat functions are so slow. These stat functions are
 * tailored for Git's usage (read: fast), and are not meant to be
 * complete. Note that Git stat()s are redirected to mingw_lstat()
 * too, since Windows doesn't really handle symlinks that well.
 */
int mingw_lstat(const char *file_name, struct stat *buf)
{
	int namelen;
	static char alt_name[PATH_MAX];

	if (!do_lstat(file_name, buf))
		return 0;

	/* if file_name ended in a '/', Windows returned ENOENT;
	 * try again without trailing slashes
	 */
	if (errno != ENOENT)
		return -1;

	namelen = strlen(file_name);
	if (namelen && file_name[namelen-1] != '/')
		return -1;
	while (namelen && file_name[namelen-1] == '/')
		--namelen;
	if (!namelen || namelen >= PATH_MAX)
		return -1;

	memcpy(alt_name, file_name, namelen);
	alt_name[namelen] = 0;
	return do_lstat(alt_name, buf);
}

#undef fstat
int mingw_fstat(int fd, struct stat *buf)
{
	HANDLE fh = (HANDLE)_get_osfhandle(fd);
	BY_HANDLE_FILE_INFORMATION fdata;

	if (fh == INVALID_HANDLE_VALUE) {
		errno = EBADF;
		return -1;
	}
	/* direct non-file handles to MS's fstat() */
	if (GetFileType(fh) != FILE_TYPE_DISK)
		return _fstati64(fd, buf);

	if (GetFileInformationByHandle(fh, &fdata)) {
		buf->st_ino = 0;
		buf->st_gid = 0;
		buf->st_uid = 0;
		buf->st_nlink = 1;
		buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
		buf->st_size = fdata.nFileSizeLow |
			(((off64_t)fdata.nFileSizeHigh)<<32);
		buf->st_dev = buf->st_rdev = 0; /* not used by Git */
		buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
		buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
		buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
		return 0;
	}
	errno = EBADF;
	return -1;
}

static inline void time_t_to_filetime(time_t t, FILETIME *ft)
{
	long long winTime = t * 10000000LL + 116444736000000000LL;
	ft->dwLowDateTime = winTime;
	ft->dwHighDateTime = winTime >> 32;
}

int mingw_utime (const char *file_name, const struct utimbuf *times)
{
	FILETIME mft, aft;
	int fh, rc;

	/* must have write permission */
	if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
		return -1;

	if (times) {
		time_t_to_filetime(times->modtime, &mft);
		time_t_to_filetime(times->actime, &aft);
	}
	else {
		SYSTEMTIME st;
		GetSystemTime(&st);
		SystemTimeToFileTime(&st, &aft);
		mft = aft;
	}
	if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
		errno = EINVAL;
		rc = -1;
	} else
		rc = 0;
	close(fh);
	return rc;
}

static inline void timeval_to_filetime(const struct timeval tv, FILETIME *ft)
{
	long long winTime = ((tv.tv_sec * 1000000LL) + tv.tv_usec) * 10LL + 116444736000000000LL;
	ft->dwLowDateTime = winTime;
	ft->dwHighDateTime = winTime >> 32;
}

int utimes(const char *file_name, const struct timeval times[2])
{
	FILETIME mft, aft;
	int fh, rc;

	/* must have write permission */
	if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
		return -1;

	if (times) {
		timeval_to_filetime(times[0], &aft);
		timeval_to_filetime(times[1], &mft);
	}
	else {
		SYSTEMTIME st;
		GetSystemTime(&st);
		SystemTimeToFileTime(&st, &aft);
		mft = aft;
	}
	if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
		errno = EINVAL;
		rc = -1;
	} else
		rc = 0;
	close(fh);
	return rc;
}

unsigned int sleep (unsigned int seconds)
{
	Sleep(seconds*1000);
	return 0;
}

int mkstemp(char *template)
{
	char *filename = mktemp(template);
	if (filename == NULL)
		return -1;
	return open(filename, O_RDWR | O_CREAT, 0600);
}

/*
 * This is like mktime, but without normalization of tm_wday and tm_yday.
 */
static time_t tm_to_time_t(const struct tm *tm)
{
	static const int mdays[] = {
	    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
	};
	int year = tm->tm_year - 70;
	int month = tm->tm_mon;
	int day = tm->tm_mday;

	if (year < 0 || year > 129) /* algo only works for 1970-2099 */
		return -1;
	if (month < 0 || month > 11) /* array bounds */
		return -1;
	if (month < 2 || (year + 2) % 4)
		day--;
	return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
		tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
}

int gettimeofday(struct timeval *tv, void *tz)
{
	SYSTEMTIME st;
	struct tm tm;
	GetSystemTime(&st);
	tm.tm_year = st.wYear-1900;
	tm.tm_mon = st.wMonth-1;
	tm.tm_mday = st.wDay;
	tm.tm_hour = st.wHour;
	tm.tm_min = st.wMinute;
	tm.tm_sec = st.wSecond;
	tv->tv_sec = tm_to_time_t(&tm);
	if (tv->tv_sec < 0)
		return -1;
	tv->tv_usec = st.wMilliseconds*1000;
	return 0;
}

int pipe(int filedes[2])
{
	if (_pipe(filedes, PIPE_BUF, 0) < 0)
		return -1;
	return 0;
}

int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
{
	int i, pending;

	if (timeout >= 0) {
		if (nfds == 0) {
			Sleep(timeout);
			return 0;
		}
		errno = EINVAL;
		return -1;
	}

	/* When there is only one fd to wait for, then we pretend that
	 * input is available and let the actual wait happen when the
	 * caller invokes read().
	 */
	if (nfds == 1) {
		if (!(ufds[0].events & POLLIN)) {
			errno = EINVAL;
			return -1;
		}
		ufds[0].revents = POLLIN;
		return 0;
	}

repeat:
	pending = 0;
	for (i = 0; i < nfds; i++) {
		DWORD avail = 0;
		HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
		if (h == INVALID_HANDLE_VALUE)
			return -1;	/* errno was set */

		if (!(ufds[i].events & POLLIN)) {
			errno = EINVAL;
			return -1;
		}

		/* this emulation works only for pipes */
		if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
			int err = GetLastError();
			if (err == ERROR_BROKEN_PIPE) {
				ufds[i].revents = POLLHUP;
				pending++;
			} else {
				errno = EINVAL;
				return -1;
			}
		} else if (avail) {
			ufds[i].revents = POLLIN;
			pending++;
		} else
			ufds[i].revents = 0;
	}
	if (!pending) {
		/* The only times that we spin here is when the process
		 * that is connected through the pipes is waiting for
		 * its own input data to become available. But since
		 * the process (pack-objects) is itself CPU intensive,
		 * it will happily pick up the time slice that we are
		 * relinguishing here.
		 */
		Sleep(0);
		goto repeat;
	}
	return 0;
}

struct tm *gmtime_r(const time_t *timep, struct tm *result)
{
	/* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
	memcpy(result, gmtime(timep), sizeof(struct tm));
	return result;
}

struct tm *localtime_r(const time_t *timep, struct tm *result)
{
	/* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
	memcpy(result, localtime(timep), sizeof(struct tm));
	return result;
}

#undef getcwd
char *mingw_getcwd(char *pointer, int len)
{
	int i;
	char *ret = getcwd(pointer, len);
	if (!ret)
		return ret;
	for (i = 0; ret[i]; i++)
		if (ret[i] == '\\')
			ret[i] = '/';
	return ret;
}

#undef rename
int mingw_rename(const char *pold, const char *pnew)
{
	DWORD attrs;

	/*
	 * Try native rename() first to get errno right.
	 * It is based on MoveFile(), which cannot overwrite existing files.
	 */
	if (!rename(pold, pnew))
		return 0;
	if (errno != EEXIST)
		return -1;
	if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
		return 0;
	/* TODO: translate more errors */
	if (GetLastError() == ERROR_ACCESS_DENIED &&
	    (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
		if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
			errno = EISDIR;
			return -1;
		}
		if ((attrs & FILE_ATTRIBUTE_READONLY) &&
		    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
			if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
				return 0;
			/* revert file attributes on failure */
			SetFileAttributes(pnew, attrs);
		}
	}
	errno = EACCES;
	return -1;
}

struct passwd *getpwuid(int uid)
{
	static char user_name[100];
	static struct passwd p;

	DWORD len = sizeof(user_name);
	if (!GetUserName(user_name, &len))
		return NULL;
	p.pw_name = user_name;
	p.pw_gecos = "unknown";
	p.pw_dir = NULL;
	return &p;
}

static HANDLE timer_event;
static HANDLE timer_thread;
static int timer_interval;
static int one_shot;
static sighandler_t timer_fn = SIG_DFL;

/* The timer works like this:
 * The thread, ticktack(), is a trivial routine that most of the time
 * only waits to receive the signal to terminate. The main thread tells
 * the thread to terminate by setting the timer_event to the signalled
 * state.
 * But ticktack() interrupts the wait state after the timer's interval
 * length to call the signal handler.
 */

static __stdcall unsigned ticktack(void *dummy UNUSED_PARAM)
{
	while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
		if (timer_fn == SIG_DFL)
			bb_error_msg_and_die("Alarm");
		if (timer_fn != SIG_IGN)
			timer_fn(SIGALRM);
		if (one_shot)
			break;
	}
	return 0;
}

static int start_timer_thread(void)
{
	timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
	if (timer_event) {
		timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
		if (!timer_thread ) {
			errno = ENOMEM;
			return -1;
		}
	} else {
		errno = ENOMEM;
		return -1;
	}
	return 0;
}

static void stop_timer_thread(void)
{
	if (timer_event)
		SetEvent(timer_event);	/* tell thread to terminate */
	if (timer_thread) {
		int rc = WaitForSingleObject(timer_thread, 1000);
		if (rc == WAIT_TIMEOUT)
			fprintf(stderr, "timer thread did not terminate timely");
		else if (rc != WAIT_OBJECT_0)
			fprintf(stderr, "waiting for timer thread failed: %lu",
			      GetLastError());
		CloseHandle(timer_thread);
	}
	if (timer_event)
		CloseHandle(timer_event);
	timer_event = NULL;
	timer_thread = NULL;
}

static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
{
	return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
}

int setitimer(int type UNUSED_PARAM, struct itimerval *in, struct itimerval *out)
{
	static const struct timeval zero;
	static int atexit_done;

	if (out != NULL) {
		errno = EINVAL;
		return -1;
	}
	if (!is_timeval_eq(&in->it_interval, &zero) &&
	    !is_timeval_eq(&in->it_interval, &in->it_value)) {
		errno = EINVAL;
		return -1;
	}

	if (timer_thread)
		stop_timer_thread();

	if (is_timeval_eq(&in->it_value, &zero) &&
	    is_timeval_eq(&in->it_interval, &zero))
		return 0;

	timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
	one_shot = is_timeval_eq(&in->it_interval, &zero);
	if (!atexit_done) {
		atexit(stop_timer_thread);
		atexit_done = 1;
	}
	return start_timer_thread();
}

int sigaction(int sig, struct sigaction *in, struct sigaction *out)
{
	if (sig != SIGALRM) {
		errno = EINVAL;
		return -1;
	}
	if (out != NULL) {
		errno = EINVAL;
		return -1;
	}

	timer_fn = in->sa_handler;
	return 0;
}

#undef signal
sighandler_t mingw_signal(int sig, sighandler_t handler)
{
	sighandler_t old = timer_fn;
	if (sig != SIGALRM)
		return signal(sig, handler);
	timer_fn = handler;
	return old;
}

int link(const char *oldpath, const char *newpath)
{
	typedef BOOL WINAPI (*T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
	static T create_hard_link = NULL;
	if (!create_hard_link) {
		create_hard_link = (T) GetProcAddress(
			GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
		if (!create_hard_link)
			create_hard_link = (T)-1;
	}
	if (create_hard_link == (T)-1) {
		errno = ENOSYS;
		return -1;
	}
	if (!create_hard_link(newpath, oldpath, NULL)) {
		errno = err_win_to_posix(GetLastError());
		return -1;
	}
	return 0;
}

char *strsep(char **stringp, const char *delim)
{
	char *s, *old_stringp;
	if (!*stringp)
		return NULL;
	old_stringp = s = *stringp;
	while (*s) {
		if (strchr(delim, *s)) {
			*s = '\0';
			*stringp = s+1;
			return old_stringp;
		}
		s++;
	}
	*stringp = NULL;
	return old_stringp;
}

char *realpath(const char *path, char *resolved_path)
{
	/* FIXME: need normalization */
	return strcpy(resolved_path, path);
}

const char *get_busybox_exec_path(void)
{
	static char path[PATH_MAX] = "";

	if (!*path)
		GetModuleFileName(NULL, path, PATH_MAX);
	return path;
}

#undef mkdir
int mingw_mkdir(const char *path, int mode UNUSED_PARAM)
{
	return mkdir(path);
}

int fcntl(int fd UNUSED_PARAM, int cmd, ...)
{
	/*
	 * F_GETFL needs to be dealt at higher level
	 * Usually it does not matter if the call is
	 *   fcntl(fd, F_SETFL, fcntl(fd, F_GETFD) | something)
	 * because F_SETFL is not supported
	 */
	if (cmd == F_GETFD || cmd == F_SETFD || cmd == F_GETFL)
		return 0;
	errno = ENOSYS;
	return -1;
}

#undef unlink
int mingw_unlink(const char *pathname)
{
	/* read-only files cannot be removed */
	chmod(pathname, 0666);
	return unlink(pathname);
}

char *strptime(const char *s, const char *format, struct tm *tm)
{
	return NULL;
}