totalsize

#include <stdio.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char* argv[])
{
    DIR *catalog = opendir(argv[1]);
    struct dirent* fp;
    struct stat *buf;
    long long int sum = 0;
    char name[PATH_MAX] = { 0 };

    while(1) {
        fp = readdir(catalog);
        if(fp == NULL) break;
	if(argv[1][strlen(argv[1]) - 1] != '/')
	    snprintf(name, PATH_MAX, "%s/%s", argv[1], fp -> d_name);
        else
	    snprintf(name, PATH_MAX, "%s%s", argv[1], fp -> d_name);
        if(lstat(name, buf) != -1)
            if(S_ISREG(buf -> st_mode) && !S_ISLNK(buf -> st_mode))
                sum += buf -> st_size;
    }
    closedir(catalog);
    printf("%lld\n", sum);
    return 0;    
}