Lösung zu Blatt 2 (Aufgabe 2): ksmain.c

ksmain.c

/*
 *      ksmain.c        - main function for knapsack searching.
 *
 *      Martin Hasch, University of Ulm, April 1997
 */

#include        <stdio.h>
#include        <stdlib.h>
#include        "typedef.h"
#include        "knapsack.h"
#include        "msearch.h"

static char *cmdname;                   /* first argv component */

/*
 *      Display usage and exit.
 */
static void usage(void)
{
        fprintf(stderr, "Usage: %s code processes timeout\n", cmdname);
        exit(EXIT_FAILURE);
}

/*
 *      Translate given string argument into a number.
 *      Call usage() in case of failure.
 */
static unsigned long getarg(char *arg)
{
        char *rest;
        unsigned long result;

        result = strtoul(arg, &rest, 0);
        if ( *rest )
                usage();
        return result;
}

/*
 *      Process command line into appropriate call of multisearch.
 */
int main(int argc, char *argv[])
{
        Code code;
        unsigned nproc;
        unsigned timeout;

        cmdname = argv[0];
        if ( argc != 4 )
                usage();
        code = getarg(argv[1]);
        nproc = getarg(argv[2]);
        timeout = getarg(argv[3]);

        multisearch(code, 0L, ks_maxkey(), knapsack, nproc, timeout);
        exit(EXIT_SUCCESS);
}