/*
 * ncat <file_name>
 *
 *   - reads a file line-by-line, printing them out with line numbers
 */

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
    if (argc != 2) {
        fprintf(stderr, "%s\n", "usage: ncat <file_name>");
        exit(1);
    }

    char *filename = argv[1];
    FILE *fp = fopen(filename, "r");
    if (fp == NULL) {
        perror(filename);
        exit(1);
    }

    char buf[100];
    int lineno = 1;
    while (fgets(buf, sizeof(buf), fp) != NULL) {
        printf("[%4d]", lineno++);
        if (fputs(buf, stdout) == EOF) {
            perror("can't write to stdout");
            exit(1);
        }
    }

    if (ferror(fp)) {
        perror(filename);
        exit(1);
    }

    fclose(fp);
    return 0;
}