// An example showing how to use stat and 
// extract information about the file type
// and access permissions

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

int main(int argc, char* argv[]){ 
    
    if( argc < 2){
        fprintf(stderr,"Usage...\n");
        return 1;
    } 
    //man 2 stat for system call
    //man 3 stat for struct
    struct stat s; 
    if(stat(argv[1],&s) < 0){
        perror("");
        return 1;
    }
    
    printf("size %ld\n", s.st_size);
    printf("modes %o\n", s.st_mode);

    //man 7 inode for macros and flags
    if (S_ISREG(s.st_mode)) {
        printf("This is a regular file\n");
    } else {
        printf("This is not a regular file\n");
    }

    if (S_IRUSR & s.st_mode) {
        printf("Owner can read\n");
    } else {
        printf("Owner can not read\n");
    }

    // Others can execute
    if (S_IXOTH & s.st_mode) {
        printf("Others can execute\n");
    } else {
        printf("Others can not execute\n");
    }
        
    return 0;
}