From:	"Michael Stewart" <mike AT reggin DOT freeserve DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: getting all filename in sub-directory
Date:	Wed, 28 Jul 1999 09:18:38 +0100
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References:	<7nliit$uvc$1 AT nnrp1 DOT deja DOT com>
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chongkong AT my-deja DOT com wrote in message <7nliit$uvc$1 AT nnrp1 DOT deja DOT com>...
>is there any sample code to do a recursive process for file of a
>certain extension from a parent directory and its sub-directory?
>
>i thinking of using system("dir > tmpfilename")
>and then checking tmpfilename.

>or is there a much better way


There certainly is :-)

>but i really have no clue on how to go on and search all the sub-
>directory


From the libc reference:

#include <dir.h>

int __file_tree_walk(const char *dir, int (*func)(const char *path, const
struct ffblk *ff));

This function recursively descends the directory hierarchy which starts with
dir.  For each file in the hierarchy, `__file_tree_walk' calls the
user-defined function func which is passed a pointer to a `NULL'-terminated
character array in path holding the full pathname of the file, a pointer to
a `ffblk' structure (see findfirst) fff with a DOS filesystem information
about that file.

This function always visits a directory before any of its siblings.  The
argument dir must be a directory, or `__file_tree_walk' will fail and set
errno to `ENOTDIR'.  The directory dir itself is never passed to func.

The tree traversal continues until one of the following events:

(1)  The tree is exhausted (i.e., all descendants of dir are processed).  In
this case, `__file_tree_walk' returns 0, meaning a success.

(2)  An invocation of func returns a non-zero value.  In this case,
`__file_tree_walk' stops the tree traversal and returns whatever func
returned.

(3)  An error is detected within `__file_tree_walk'.  In that case, `ftw'
returns -1 and sets errno (see errno) to a suitable value.

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