1#include <stdio.h> 2#include <stdlib.h> 3#include <getopt.h> 4 5main(int argc, char *argv[]) 6{ 7    int i=33, hex=0, extended=0; 8 9    while (optind < argc) {10        switch (getopt(argc, argv, "dehxf")) {11        case 'd': /* decimal */12            hex=0;13            break;14        case 'e': /* extended vt100 chars */15            extended=1;16            break;17        case 'h': /* help screen */18            printf("%s usage:\n",argv[0]);19            printf("\t%s [ -d | -x ] [ -f ] [ -e ]\n", argv[0]);20            printf("\t-d - print out index in decimal\n");21            printf("\t-x - print out index in hexidecimal\n");22            printf("\t-f - full printout - don't skip control characters\n");23            printf("\t-e - Use ^N and ^O to enable some vt100 graphics\n");24            exit(0);25            break;26        case 'x': /* hex */27            hex=1;28            break;29        case 'f': /* full */30            i=0;31            break;32        }33    }34    35    /* i is set above */36    for (;i <= 255; i++) {37        /* print the number of the char, and the char */38        if (hex)39            printf(" %x ", i);40        else41            printf(" %d ", i);42        if (extended)43            printf("\xe%c\xf\t", i);44        else45            printf("%c\t", i);46        /* wrap to next line after 8 chars */47        if (i % 8 == 0) puts("");48    }49    puts("");50}