[vox-tech] [C newbie]C program is acting weird...

[Mark K. Kim]

What do you *want* it to do?

Including numbers will need some math trickery.  The place with 'z' and
'a' is where it's picking a letter between 'a' and 'z', but since numbers
aren't in a sequential order in the ASCII system, you can do something
like expanding the range and 'if'-ing the range for a letter or number.

-Mark

On Thu, 31 Jan 2002, Ryan wrote:

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> Hash: SHA1
>
> for some reason this is spitting out 3 char responses once in a while, anyone
> have any ideas? I don't know much C, this is just some code I modified.
>
> Also, if anyone knows how to get it to include numbers mixed in with the
> letters i'd like to know how.
> - ------
>
> #include <stdio.h>
> #include <sys/types.h>
> #include <unistd.h>
> #include <signal.h>
> #include <stdlib.h>
> #include <time.h>
> #include <string.h>
>
> #include "version.h"
>
> #define SESSION_TIMEOUT 20
>
> #define MAX_RESPONSE 200
> #define MAX_REQUEST 100
>
> #define MIN_LEN 4
> #define MAX_LEN 9
>
> char *randusername()
> {
>         char *string;
>         int i, length;
>         // randomly choose a length betweem MIN_LEN and MAX_LEN
>         length = MIN_LEN + random() / (RAND_MAX / (MAX_LEN + 2 - MIN_LEN))-1;
>         if (string = malloc(length + 2), string == NULL)
>                 return NULL;
>         for (i = 0; i < length; i++)
>                 // does your head hurt yet?
>                 string[i] = 'a' + random() / (RAND_MAX / ('z' + 1 - 'a'));
>         // zero terminate!
>         i++;
>         string[i] = '\0';
>         return string;
> }
> - --
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--
Mark K. Kim
http://www.cbreak.org/mark/
PGP key available upon request.