Mystat

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

#define ec_neg(s,m) \
if ( (s) < 0 ) {perror(m); enegflag = 0;}
#define ec_null(s,m) \
if ( (s) == NULL ) {perror(m); enulflag = 0;}

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

    int i, enegflag=1, enulflag = 1;
    struct stat fileStat;
    struct passwd * ppp;
    struct group * ggg;

    if(argc<2){
        printf("Syntax : mystat file1 ... file N\n");
        printf("Prints the attributes of the list of files on stdout\n");
        exit(-1);
    }

    for(i=1;i<argc;i++){
        printf("Information for %s\n",argv[i]);
        printf("---------------------------\n");
        ec_neg(stat(argv[i],&fileStat),"Couldn't read info for this file\n");
        if(enegflag){
            printf("File Size: \t\t%ld bytes\n",(long)fileStat.st_size);
            printf("Number of Links: \t%d\n",fileStat.st_nlink);
            printf("File inode: \t\t%ld\n",(long)fileStat.st_ino);
            ppp = getpwuid(fileStat.st_uid);
            ec_null(ppp,"Couldn't get the uid info");
            ggg = getgrgid(fileStat.st_gid);
            ec_null(ggg,"Couldn't get the gid info");
            if(enulflag){
                printf("User ID: \t\t%s\n",ppp->pw_name);
                printf("Group ID: \t\t%s\n",ggg->gr_name);
            }
            printf("Last modification: \t%s",(asctime(localtime(&fileStat.st_mtime))));
            printf("Host device: \t\t%ld\n",(long)fileStat.st_dev);
            printf("File Permissions: \t");
            printf( (S_ISDIR(fileStat.st_mode)) ? "d" : "-");
            printf( (fileStat.st_mode & S_IRUSR) ? "r" : "-");
            printf( (fileStat.st_mode & S_IWUSR) ? "w" : "-");
            printf( (fileStat.st_mode & S_IXUSR) ? "x" : "-");
            printf( (fileStat.st_mode & S_IRGRP) ? "r" : "-");
            printf( (fileStat.st_mode & S_IWGRP) ? "w" : "-");
            printf( (fileStat.st_mode & S_IXGRP) ? "x" : "-");
            printf( (fileStat.st_mode & S_IROTH) ? "r" : "-");
            printf( (fileStat.st_mode & S_IWOTH) ? "w" : "-");
            printf( (fileStat.st_mode & S_IXOTH) ? "x" : "-");
            printf("\n");
            printf("The file %s a symbolic link\n", (S_ISLNK(fileStat.st_mode)) ? "is" : "is not");
        }
        printf("\n\n");
        enegflag = 1;
        enulflag = 1;
    }

    return 0;
}