// // // // // // // // // // // // // // // // // // // // // // // // 
//
//   CS270 Class Example
//
//   Author: Robert Heckendorn
//           University of Idaho
//
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <sys/stat.h>  // modes are here
#include <fcntl.h>     // 
void fileprocessing(char *file)
{
    int fd;
    int len;
    char buf[] = "A fluffy dog is great.";
    struct stat statBuf;

    if (stat(file, &statBuf)==-1) {  
        fprintf(stderr, "ERROR: could not stat in file '%s'\n", file);
    }
    else {
	    if (S_ISCHR(statBuf.st_mode)) {
		    printf("character special device");
	    }
	    else if (S_ISBLK(statBuf.st_mode)) {
		    printf("block special device");
	    }
	    else {
		    printf("%s inode: %d", file, statBuf.st_ino);
	    }
	    printf("\n");
    }
}


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

    // // // // // // // // // // // // //
    // begin of arg processing
    extern char *optarg; // if takes a value that is returned here
    extern int optind;   // index into argv
    extern int optopt;   // invalid character on error
    extern int opterr;   // set to zero to force getopt to be silent on errors

    int c;
    bool aflg, nflg, fflg, zflg, errflg;
    char *file;
    int num;

    aflg = nflg = fflg = zflg = errflg = false;
    file = NULL;
    num = 0;
    opterr = 0;

    // hunt for a string of options
    while ((c = getopt(argc, argv, "n:f:")) != EOF)
        switch (c) {
        case  'n':
            char *endptr;
	    int tmpnum;

            nflg = true;
            tmpnum = strtol(optarg, &endptr, 10);
            if (*endptr!='\0') {
                fprintf(stderr, "number on -n option: %s is not legal.\n", optarg);
            }
	    else {
                num = tmpnum;
	    }
            break;
        case        'f':
            if (fflg) {
                fprintf(stderr, "-f option can be used only once.  First one is used.\n");
            }
            else {
                fflg = true;
                file = strdup(optarg);
            }
            break;
        case        ':':  // missing argument case
            fprintf(stderr, "%s: option -%c requires an option\n", argv[0], optopt);
            errflg = 1;
            break;

        case        '?':  // bad option case
        default:
            fprintf(stderr, "%s: option -%c is not an option\n", argv[0], optopt);
            errflg = 1;
        }

    // report any errors or usage request
    if (errflg) {
        fprintf(stderr, "usage: %s [-a] [-z] [-o <filename>] files...\n", argv[0]);
// do you want to continue?        exit(2);
    }

    // pick off a nonoptions as if they were files
    for (; optind < argc; optind++) {
	    fileprocessing(argv[optind]);
    }
    // end of arg processing
    // // // // // // // // // // // // //


    return 0;
}