/*

	sysutil: generic utilities to interact with the OS (signals, paths)

	copyright ?-2014 by the mpg123 project - free software under the terms of the LGPL 2.1

	see COPYING and AUTHORS files in distribution or http://mpg123.org

	initially written by Michael Hipp (dissected/renamed by Thomas Orgis)

*/

#include "mpg123app.h"

#include <sys/stat.h>

#include "sysutil.h"

#include "debug.h"

#if 0

/* removed the strndup for better portability */

/*

 *   Allocate space for a new string containing the first

 *   "num" characters of "src".  The resulting string is

 *   always zero-terminated.  Returns NULL if malloc fails.

 */

char *strndup (const char *src, int num)

{

	char *dst;

	if (!(dst = (char *) malloc(num+1)))

		return (NULL);

	dst[num] = '\0';

	return (strncpy(dst, src, num));

}

#endif

size_t dir_length(const char *path)

{

	char * slashpos = strrchr(path, '/');

	return (slashpos ? slashpos-path : 0);

}

/*

 *   Split "path" into directory and filename components.

 *

 *   Return value is 0 if no directory was specified (i.e.

 *   "path" does not contain a '/'), OR if the directory

 *   is the same as on the previous call to this function.

 *

 *   Return value is 1 if a directory was specified AND it

 *   is different from the previous one (if any).

 */

int split_dir_file (const char *path, char **dname, char **fname)

{

	static char *lastdir = NULL;

	char *slashpos;

	if ((slashpos = strrchr(path, '/'))) {

		*fname = slashpos + 1;

		*dname = compat_strdup(path); /* , 1 + slashpos - path); */

		if(!(*dname)) {

			perror("failed to allocate memory for dir name");

			return 0;

		}

		(*dname)[1 + slashpos - path] = 0;

		if (lastdir && !strcmp(lastdir, *dname)) {

			/***   same as previous directory   ***/

			free (*dname);

			*dname = lastdir;

			return 0;

		}

		else {

			/***   different directory   ***/

			if (lastdir)

				free (lastdir);

			lastdir = *dname;

			return 1;

		}

	}

	else {

		/***   no directory specified   ***/

		if (lastdir) {

			free (lastdir);

			lastdir = NULL;

		};

		*dname = NULL;

		*fname = (char *)path;

		return 0;

	}

}