Find the size of a directory

dirsize.c

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

int main(int argc, char** argv)
{
	char * paths[] = {argv[1], NULL};
	FTS *fts = fts_open(&paths[0], FTS_NOCHDIR, NULL);
	if (fts == NULL)
	{
		fprintf(stderr, "fts_open error: %s", strerror(errno));
		return EXIT_FAILURE;
	}

	long size = 0;

	for (;;)
	{
		FTSENT *ftsent = fts_read(fts);
		if (ftsent == NULL)
		{
			if (errno)
			{
				fprintf(stderr, "fts_read error: %s", strerror(errno));
				return EXIT_FAILURE;
			}
			break;
		}

		if (ftsent->fts_info & FTS_F)
		{
			size += ftsent->fts_statp->st_size;
		}
	}

	if (fts_close(fts))
	{
		fprintf(stderr, "fts_close error: %s", strerror(errno));
		return EXIT_FAILURE;
	}

	printf("%ld\n", size);

	return EXIT_SUCCESS;
}