#include <stdio.h>

#define MAXSIZE (sizeof("ENABLE DISK SPINDOWN"))

#if 0
int rtvchk(char *cfp) 
{
    int result=1,i;

    for(i=0;i<strlen(cfp);i++)
        result=cfp[i]+(result*0x23cd017);

    return(result);
}
#endif

void reverse_cpy(char * dst, char * src)
{
    int sz, i;

    sz = strlen(src);
    for (i = 0; i < sz; i++) {
        dst[i] = src[sz-i-1];
    }
}

void report(char *tag, char * cfp, int r)
{
    char buf[256] = "";

    reverse_cpy(buf, cfp);
    
    printf("%s :%s: = 0x%08x\n", tag, buf, r);
}

void checkone(char * cfp, int * partials)
{
    switch(partials[0]) {
        case 0x5fda1d5b:
        case 0x46eab022:
        case 0x25e21157:
        case 0x0ddc069e:
        case 0x42496179:
        case 0x4ff7114d:
        case 0x490d8b70:
        case 0x56d12d37:
        case 0x919e3b1d:
        case 0x85f7f312:
        case 0x7e1a2d34:
        case 0x8916f62c:
        case 0xbc08f74d:
        case 0xb5cce08e:
        case 0xd4b52763:
        case 0xe4a17103:
            report("Found one:", cfp, partials[0]);
            break;
	default:
//          report("No good: ", cfp, partials[0]);
	    break;
    }
}

void increment(char * p, int * partials, int i)
{
    if (i == MAXSIZE)
        exit(0);
    
    switch(p[i]) {
        case 'Z':
            increment(p, partials, i+1);
            /* fallthrough */
        case 0:
            p[i] = ' ';
            partials[i] = partials[i+1] * 0x23cd017 + p[i];
            break;
        case ' ':
            p[i] = 'A';
            partials[i] = partials[i+1] * 0x23cd017 + p[i];
            break;
        default:
            p[i]++;
            partials[i]++;
            break;
    }
}

int main(int argc, char ** argv)
{
    int i;
    char testbuf[MAXSIZE] = {'A', 0};
    int partials[MAXSIZE+1];

    if (argc > 1) {
        reverse_cpy(testbuf, argv[1]);
    }
        
    for (i = 0; i <= MAXSIZE; i++)
        partials[i] = 1;
    for (i = strlen(testbuf)-1; i >= 0; i--)
        partials[i] = (partials[i+1] * 0x23cd017) + testbuf[i];
    while (1) {
        checkone(testbuf, partials);
        increment(testbuf, partials, 0);
    }
}