asm/decimal.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sat, 13 Dec 2008 17:58:06 +0100
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clear() is better than resize(0) committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * test/demos/asm/decimal.c
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#define  MAXBITS __WORDSIZE
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#define  MAXVALUE ULONG_MAX
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typedef unsigned long int ULONG;
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void usage (char *name)
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{
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    printf ("Usage: %s start [end] [base]\n", name);
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}
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/*
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 * Computes the binary representation of a
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 * decimal value and returns the result
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 * in proper order and the number of digits
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 */
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char *dec_to_base (ULONG decimal, int base, int *digits)
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{
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    char *encoded;
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    char swp;
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    int i;
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    i = 0;
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    if ((decimal > MAXVALUE)) {
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        perror ("VALUE TOO BIG");
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        return NULL;
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    }
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    if ((encoded = malloc ((MAXBITS) * sizeof (char))) == NULL) {
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        perror ("MALLOC ERROR");
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        return NULL;
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    }
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    while (decimal > base - 1) {
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        encoded[i++] = (decimal % base);
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        decimal /= base;
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    }
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    encoded[i++] = (decimal % base);
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    *digits = i;
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    for (i = 0; i < *digits - 1; i++) {
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        swp = encoded[*digits - i - 1];
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        encoded[*digits - i - 1] = encoded[i];
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        encoded[i] = swp;
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    }
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    return encoded;
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}
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int main (int argc, char **argv)
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{
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    ULONG decimal, start, end;
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    int bits, base, i;
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    char *binaer;
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    base = 2;
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    if (argc == 2) {
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        start = atol (argv[1]);
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        end = start + 1;
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    } else if (argc == 3) {
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        start = atol (argv[1]);
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        end = atol (argv[2]);
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    } else if (argc == 4) {
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        start = atol (argv[1]);
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        end = atol (argv[2]);
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        base = atoi (argv[3]);
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    } else {
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        usage (argv[0]);
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        return EXIT_SUCCESS;
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    }
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    if (!((start >= 0) && (end > start) && (base > 1))) {
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        usage ("Trottel");
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        printf ("%ld\t%ld\t%d\n", start, end, base);
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        return EXIT_SUCCESS;
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    }
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    printf ("\tVALUE \t\tDIGITS\t\t Encoded\n");
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    printf ("----------------------------------------------------\n");
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    for (decimal = start; decimal < end; decimal++) {
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        if ((binaer = dec_to_base (decimal, base, &bits)) == NULL) {
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            return EXIT_FAILURE;
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        }
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        printf ("%12ld %12d \t\t", decimal, bits);
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        for (i = 0; i < bits; i++) {
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            printf ("%X", binaer[i]);
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        }
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        printf ("\n");
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        if (binaer)
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            free (binaer);
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    }
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    return EXIT_SUCCESS;
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}