hi, first time posting here, so go easy if ive done something wrong :)

ive written a password generator in D.  nice language :)
the problem occurs whenever i output (printf) a passwords that are a multiple of
32 characters long.

it will print out the password, then concatenate the previous password onto it as well.  eg:

C:\D\myPrograms\passGen>passgen -iterate 10 -min 25 -max 32 -notsayable
VmJmQMCGalHJmLGkyZCqiKTBneOe
oXOYHujRqiWIiPjawrQmNBFiCxVPdhhKVmJmQMCGalHJmLGkyZCqiKTBneOe
MCeGuhbIjILHGUjZIAPtwXCTa
YvlPqNtmDMoSaCRvYePlRKhUJBO
cRodRplUJmbnYOeJPDuAJdbfKmcbQ
SQLSRdARdthOHuNOTAEZLAMnQTB
IHZdqDLivShuhxEvckBprZFtmHZWQ
PMBdFYydCrSFxpioxefBQdUTaWVOB
bpEVXTVyoMsBgkWnbYywIwhqr
sXjQybaGGPnPvuvWuODASLsUgLKVq

if you look closely, you can see the second password is obviously too long, and the last 28 characters are actually the previous password

if i tell it to print out the length, it never says 64 or whatever, it still pretends the password is just 32.

i can attatch my code if you want, but its about 600 lines long.

basically i get a random character, and keep appending random characters to it until its the length it is supposed to be.  i then printf the password, and if its 32 chars long, it will either print out the previous password as a concatenation to the new one, or it will append ☺  (a smilie face) to the end of the password.

im quite stumped.

if i only tell it to print out a single generated password, it does this:

C:\D\myPrograms\passGen>passgen -iterate 1 -min 32 -max 32 -notsayable sgJJeNKrfycrhSdYBKPUvEEubCKFswNMThis    is       a fofof        This is a silly silly list


i can assure you i dont even have the word "silly" anywhere in my code :)

thanks for listening, i definitely dont pretend to be a great programmer, so feel free to slap me if there's some programming standard i dont know about that does this.

Nick.

if you posted some code it might help, perhaps you can produce a 10 lines prog that exibits the same behaviour

this is just a guess
you use printf( "%s", cast(char *)str )  ?
try
printf( "%.*s", str )

D strings (char[]) are slices into arrays i.e. struct{pointer to first char, length} not null termed strings like C

Mike.

<nick.fletcher@dingoblue.com.au> wrote in message news:b1v0ke$2dit$1@digitaldaemon.com...
> hi, first time posting here, so go easy if ive done something wrong :)
>
> ive written a password generator in D.  nice language :)
> the problem occurs whenever i output (printf) a passwords that are a
multiple of
> 32 characters long.
>
> it will print out the password, then concatenate the previous password
onto it
> as well.  eg:
>
> C:\D\myPrograms\passGen>passgen -iterate 10 -min 25 -max 32 -notsayable
> VmJmQMCGalHJmLGkyZCqiKTBneOe
> oXOYHujRqiWIiPjawrQmNBFiCxVPdhhKVmJmQMCGalHJmLGkyZCqiKTBneOe
> MCeGuhbIjILHGUjZIAPtwXCTa
> YvlPqNtmDMoSaCRvYePlRKhUJBO
> cRodRplUJmbnYOeJPDuAJdbfKmcbQ
> SQLSRdARdthOHuNOTAEZLAMnQTB
> IHZdqDLivShuhxEvckBprZFtmHZWQ
> PMBdFYydCrSFxpioxefBQdUTaWVOB
> bpEVXTVyoMsBgkWnbYywIwhqr
> sXjQybaGGPnPvuvWuODASLsUgLKVq
>
> if you look closely, you can see the second password is obviously too
long, and
> the last 28 characters are actually the previous password
>
> if i tell it to print out the length, it never says 64 or whatever, it
still
> pretends the password is just 32.
>
> i can attatch my code if you want, but its about 600 lines long.
>
> basically i get a random character, and keep appending random characters
to it
> until its the length it is supposed to be.  i then printf the password,
and if
> its 32 chars long, it will either print out the previous password as a concatenation to the new one, or it will append &#9786;  (a smilie face)
to the
> end of the password.
>
> im quite stumped.
>
> if i only tell it to print out a single generated password, it does this:
>
> C:\D\myPrograms\passGen>passgen -iterate 1 -min 32 -max 32 -notsayable sgJJeNKrfycrhSdYBKPUvEEubCKFswNMThis    is       a fofof        This is a
silly
> silly list
>
>
> i can assure you i dont even have the word "silly" anywhere in my code :)
>
> thanks for listening, i definitely dont pretend to be a great programmer,
so
> feel free to slap me if there's some programming standard i dont know
about that
> does this.
>
> Nick.
>
>

that worked, thanks!

could i just ask, whats the difference between

printf("%s", (char *)str[]);   //   <-- this is what i used

and

printf("%.*s", str);    //   <-- this is what worked

?
from what you say, using the first one ignore the length property of the char
array and prints till it can print no more?



In article <b1v1bi$2due$1@digitaldaemon.com>, Mike Wynn says...
>
>if you posted some code it might help, perhaps you can produce a 10 lines prog that exibits the same behaviour
>
>this is just a guess
>you use printf( "%s", cast(char *)str )  ?
>try
>printf( "%.*s", str )
>
>D strings (char[]) are slices into arrays i.e. struct{pointer to first char, length} not null termed strings like C
>
>Mike.
>
><nick.fletcher@dingoblue.com.au> wrote in message news:b1v0ke$2dit$1@digitaldaemon.com...
>> hi, first time posting here, so go easy if ive done something wrong :)
>>
>> ive written a password generator in D.  nice language :)
>> the problem occurs whenever i output (printf) a passwords that are a
>multiple of
>> 32 characters long.
>>
>> it will print out the password, then concatenate the previous password
>onto it
>> as well.  eg:
>>
>> C:\D\myPrograms\passGen>passgen -iterate 10 -min 25 -max 32 -notsayable
>> VmJmQMCGalHJmLGkyZCqiKTBneOe
>> oXOYHujRqiWIiPjawrQmNBFiCxVPdhhKVmJmQMCGalHJmLGkyZCqiKTBneOe
>> MCeGuhbIjILHGUjZIAPtwXCTa
>> YvlPqNtmDMoSaCRvYePlRKhUJBO
>> cRodRplUJmbnYOeJPDuAJdbfKmcbQ
>> SQLSRdARdthOHuNOTAEZLAMnQTB
>> IHZdqDLivShuhxEvckBprZFtmHZWQ
>> PMBdFYydCrSFxpioxefBQdUTaWVOB
>> bpEVXTVyoMsBgkWnbYywIwhqr
>> sXjQybaGGPnPvuvWuODASLsUgLKVq
>>
>> if you look closely, you can see the second password is obviously too
>long, and
>> the last 28 characters are actually the previous password
>>
>> if i tell it to print out the length, it never says 64 or whatever, it
>still
>> pretends the password is just 32.
>>
>> i can attatch my code if you want, but its about 600 lines long.
>>
>> basically i get a random character, and keep appending random characters
>to it
>> until its the length it is supposed to be.  i then printf the password,
>and if
>> its 32 chars long, it will either print out the previous password as a concatenation to the new one, or it will append &#9786;  (a smilie face)
>to the
>> end of the password.
>>
>> im quite stumped.
>>
>> if i only tell it to print out a single generated password, it does this:
>>
>> C:\D\myPrograms\passGen>passgen -iterate 1 -min 32 -max 32 -notsayable sgJJeNKrfycrhSdYBKPUvEEubCKFswNMThis    is       a fofof        This is a
>silly
>> silly list
>>
>>
>> i can assure you i dont even have the word "silly" anywhere in my code :)
>>
>> thanks for listening, i definitely dont pretend to be a great programmer,
>so
>> feel free to slap me if there's some programming standard i dont know
>about that
>> does this.
>>
>> Nick.
>>
>>
>
>

printf uses "%s" to show a null ( "\0" ) terminated string,
in C char[] foo = " this"
in D char[] foo = "this\0";
printf( "%s", &(foo[0]) ); or cast(char*)

because a D array is a length AND pointer to start of array (C array is just
a pointer to start)

the "%.*s" is used because this tells printf that you are passing a length and a pointer (not just a pointer).

D arrays are this way so the slice foo[2..n] opperation just creates a new
"array" that has a start pointer &(foo[2]) and length n-2
making it very fast. (at the expence that printf need to be told) and char[]
are NOT quite C char*'s
hence the toStringz( str ) in string.d (phobos).

yes, using cast(char*) returns a pointer to the first element of the array,
but it may be a slice into a much bigger array and not null "\0" terminated
(so printf gets confused).

Mike.

<nick.fletcher@dingoblue.com.au> wrote in message news:b1v2ie$2ehj$1@digitaldaemon.com...
> that worked, thanks!
>
> could i just ask, whats the difference between
>
> printf("%s", (char *)str[]);   //   <-- this is what i used
>
> and
>
> printf("%.*s", str);    //   <-- this is what worked
>
> ?
> from what you say, using the first one ignore the length property of the
char
> array and prints till it can print no more?
>
>
>
> In article <b1v1bi$2due$1@digitaldaemon.com>, Mike Wynn says...
> >
> >if you posted some code it might help, perhaps you can produce a 10 lines prog that exibits the same behaviour
> >
> >this is just a guess
> >you use printf( "%s", cast(char *)str )  ?
> >try
> >printf( "%.*s", str )
> >
> >D strings (char[]) are slices into arrays i.e. struct{pointer to first
char,
> >length} not null termed strings like C
> >
> >Mike.
> >
> ><nick.fletcher@dingoblue.com.au> wrote in message news:b1v0ke$2dit$1@digitaldaemon.com...
> >> hi, first time posting here, so go easy if ive done something wrong :)
> >>
> >> ive written a password generator in D.  nice language :)
> >> the problem occurs whenever i output (printf) a passwords that are a
> >multiple of
> >> 32 characters long.
> >>
> >> it will print out the password, then concatenate the previous password
> >onto it
> >> as well.  eg:
> >>
> >> C:\D\myPrograms\passGen>passgen -iterate 10 -min 25 -max 32 -notsayable
> >> VmJmQMCGalHJmLGkyZCqiKTBneOe
> >> oXOYHujRqiWIiPjawrQmNBFiCxVPdhhKVmJmQMCGalHJmLGkyZCqiKTBneOe
> >> MCeGuhbIjILHGUjZIAPtwXCTa
> >> YvlPqNtmDMoSaCRvYePlRKhUJBO
> >> cRodRplUJmbnYOeJPDuAJdbfKmcbQ
> >> SQLSRdARdthOHuNOTAEZLAMnQTB
> >> IHZdqDLivShuhxEvckBprZFtmHZWQ
> >> PMBdFYydCrSFxpioxefBQdUTaWVOB
> >> bpEVXTVyoMsBgkWnbYywIwhqr
> >> sXjQybaGGPnPvuvWuODASLsUgLKVq
> >>
> >> if you look closely, you can see the second password is obviously too
> >long, and
> >> the last 28 characters are actually the previous password
> >>
> >> if i tell it to print out the length, it never says 64 or whatever, it
> >still
> >> pretends the password is just 32.
> >>
> >> i can attatch my code if you want, but its about 600 lines long.
> >>
> >> basically i get a random character, and keep appending random
characters
> >to it
> >> until its the length it is supposed to be.  i then printf the password,
> >and if
> >> its 32 chars long, it will either print out the previous password as a concatenation to the new one, or it will append &#9786;  (a smilie
face)
> >to the
> >> end of the password.
> >>
> >> im quite stumped.
> >>
> >> if i only tell it to print out a single generated password, it does
this:
> >>
> >> C:\D\myPrograms\passGen>passgen -iterate 1 -min 32 -max 32 -notsayable sgJJeNKrfycrhSdYBKPUvEEubCKFswNMThis    is       a fofof        This is
a
> >silly
> >> silly list
> >>
> >>
> >> i can assure you i dont even have the word "silly" anywhere in my code
:)
> >>
> >> thanks for listening, i definitely dont pretend to be a great
programmer,
> >so
> >> feel free to slap me if there's some programming standard i dont know
> >about that
> >> does this.
> >>
> >> Nick.
> >>
> >>
> >
> >
>
>