/* by Mark A. Sheldon, February 2005 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <dirent.h>

/* Usage:  lsdir [dirname]
   Prints the files in the specified directory or "." if no dirname is given.
*/

void lsdir(char *path)
{
	DIR *dirp;
	struct dirent *entry;

	dirp = opendir(path);
	if (dirp == NULL) {
		fprintf(stderr, "lsdir:  Cannot open %s: %s\n",
			path, strerror(errno));
		exit(EINVAL);
	}

	/* Reset errno on each iteration to detect readdir() errors */
	while ( errno = 0, (entry = readdir(dirp)) != NULL ) 
		puts(entry->d_name);

	if (errno != 0) fprintf(stderr, "lsdir: Error reading %s: %s\n",
				path, strerror(errno));

	/* Since we're already done, is there really a reason to check
	   for failure on close? */
	if (closedir(dirp) == -1)
		fprintf(stderr, "lsdir: Error closing %s: %s\n",
			path, strerror(errno));

	return;
    
} /* lsdir */

int main(int argc, char* argv[])
{
	char *dirname;

	if (argc > 2) {
		fprintf(stderr, "Usage: %s [dirname]\n", argv[0]);
		exit(EINVAL);
	}
	if (argc == 2)
		dirname = argv[1];
	else
		dirname = ".";

	lsdir(dirname);
	return 0;

} /* main() */