belmo.c

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

void cls()
{
    system("clear");
}

struct f_info
{
    char *ext;
    size_t size;
};

struct f_info *f_file(const char *pname)
{
    char *name = malloc(32);
    struct f_info *info = malloc(sizeof(struct f_info));
    info->ext = malloc(8);
    strcpy(name, pname);
    int i=0; while (name[i] != '.' && name[i]) i++;
    i++;
    strncpy(info->ext, name+i, 4);
    struct stat st;
    if (lstat(name, &st) < 0) info->size = 0;
    else info->size = st.st_size;
    return info;
}


int main(int argc, char *argv[])
{
    if (argc != 2) return -1;
    cls();
    struct f_info *r = f_file(argv[1]);
    if (r)
        printf("extension : %s\tsize : %zu\n", r->ext, r->size);
    puts("/bin/sh");
    return 0;
}