From mboxrd@z Thu Jan  1 00:00:00 1970
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From: northern snowfall <dbailey27@ameritech.net>
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To: 9fans@cse.psu.edu
Subject: Re: [9fans] same functions everywhere
References: <20030501160047.7231.qmail@g.bio.cse.psu.edu> <000c01c3147c$c7665ae0$7b83773e@SOMA> <3EB8E817.4090609@ameritech.net> <20030507124006.D26796@cackle.proxima.alt.za> <3EB9049D.50500@ameritech.net> <20030507142511.F26796@cackle.proxima.alt.za>
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Date: Wed,  7 May 2003 08:34:27 -0500
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>
>
>Not really.  Mostly, one wants the location where the item was found
>(x, in my example) which your function discards.  Sometimes, one may
>want to take action if the item is not found.
>
I saw this comin' as soon as I hit the send button. Oh well.
Simply add in functionality to determine the slot of the
first false test.

#include <u.h>
#include <libc.h>

enum {
    true,
    false,
};

// returns true if all slots EQUATE to val
// returns false if all slots do NOT equate to val
// side effects: equates *pos to the first slot that tests false
int
gotvalue/*?*/(int * a, uint len, int val, uint * pos)
{
    uint ua;
    for(ua = 0; ua < len; ua++) {
        if(a[ua] != val) {
            *pos = ua;
            return false;
        }
    }
    return true;
}

int
main(int argc, char * argv[])
{
    int a[100];
    uint pos;

    // somehow "a" gets filled with values

    if(gotvalue(&a[0], sizeof(a), 0xdeadca75, &pos) == true)
        print("yay, we're true! \ n");
    else
        print("negate at slot %ud \n", pos);

    exits(0);
}