[GRASS5] winGRASS: mingw32 and execl (g.list)

Glynn Clements glynn at gclements.plus.com
Thu Jan 26 10:41:23 EST 2006

Markus Neteler wrote:

> > > Now a question: While 'g.list' compiled, it just does not display
> > > anything and exits. May execl() be the problem?
> > > general/manage/cmd/list.c
> > 
> OK, it's not execl().
> The problem is here:
> lib/gis/list.c
>         if (lister)
>             sprintf(buf,"ls '%s'", path);
>         else
>             sprintf(buf,"ls -C '%s'", path);
> which is unlikely to work in MS-Windows. No idea, how to
> solve that, though. Someone may implement a workaround
> for MS-Windows.

For Unix, the standard way to enumerate a directory's contents is
with opendir/readdir/closedir, e.g.:

	DIR *dir = opendir(path);

	for (;;)
		struct dirent *d = readdir(dir);

		if (!d)



Windows has FindFirstFile/FindNextFile/FindClose, e.g.:

	WIN32_FIND_DATA data;
	HANDLE handle;

	handle = FindFirstFile("*", &data);

	for (;;)
		if (!handle)


		if (!FindNextFile(handle, &data))


More generally, we should stop spawning external programs for simple
tasks, e.g. ls, rm, mv, cat. We need to examine all uses of system(),
G_system() and G_popen(). Many (most?) of those calls will introduce
portability issues.

Glynn Clements <glynn at gclements.plus.com>

More information about the grass-dev mailing list