termination of strings in solaris 9

Hi , the routine is quite small and are using a special library to handle the informix database. Part of the code is as follows:

1)

if( op == '1' )

cc = iod("C1,GF","si002",&si002buf,"*","F,loginid,EQ",&neclogin,"Q");

else

[b] cc = iod("C2,GF","si002",&si002buf,"*","F,loginid,EQ",&neclogin,"Q");

if ( cc != IODOK )

{

fprintf(err,"ERROR: Hittade inte Login: %s, cc = %d\n",login,cc);

cc = iod("EV,ET","*");

znsysdel();

printf("-1");

return( -1);

}

fill (pass,sizeof pass,NULL);

fill (necpass,sizeof necpass,NULL);

movst(argv[2],0,pass,0,v2l);

decryptSJ(pass, v2l);

movst(si002buf.pass,0,necpass,0,v2l);

zndecry(necpass, strlen(necpass));

fill(fillpass, sizeof fillpass,NULL);

movst(pass,0,fillpass,0,strlen(pass));

if( znstcp(necpass,fillpass,znlength(necpass, strlen(necpass))))

{

fprintf(err,"ERROR: L鰏enorden 鋜 fel.\n");

cc = iod("EV,ET","*");

znsysdel();

printf("-2");

return( -2);

}

fill(dbbeh,sizeof dbbeh,NULL);

movst(si002buf.sit004,0,dbbeh,0,8);

fprintf(err,"Test av NULL i -xc99=nOne -xchar=u & Xt: %s %d \n",si002buf.sit

004,strlen(si002buf.sit004));

movst(dbbeh,0,beh,0,8);

if(znstcp("sisujava",beh,8))

- --

2) The structure of the database record:

sisu@hagbard$ cat si002.sfi

struct SI002P/* autogenerated 2006-06-27 11:13:20 */

{

unsigned char loginid[12];

unsigned char sign[8];

unsigned char pass[10];

double datchgd;

int sit011;

int knr;

unsigned char sit012[1];

int sit001;

int sit002;

int sit003;

unsigned char sit004[8];

unsigned char sit005[8];

unsigned char sit006[8];

unsigned char sit007[8];

unsigned char sit008[8];

unsigned char sit009[8];

};

=====================================================

3) The result when running the routine:

sisu@hagbard$ cat AuthChk*

AuthChk.bin startad : 06-06-27 11:23:39

Parametrarna 鋜 (rgpq ),(rgpq ),(null) och (0)

L鋘gder: 4 4

znstart OK!

znappin sisu98 OK!

OP si002 OK!

Login innan konv: (rgpq)

Login efter konv: (sisu)

Test av NULL i -xc99=nOne -xchar=u & Xt: sisujavaALL

48

OK, Operation Successful!

======================================================

It looks as if "strlen" think that the string is 48 Chars, when it is only 8 chars when it's not terminated by NULL.

--

Hope this will give enough information. Otherwise pse come back for more.

Lasse50

lasse50 at 2007-7-6 21:20:36 >

Hi, I'am aware of the way the problem behaves but my real question was if there is a flag that can go around the problem. The c-compiler we used in solaris 8 didn't behave (produce a code) like this.

What we would like is "look for NULL up to the end of the declared string-length if not found then string-length = declared length".

Are there a compilerflag like this or is it possible to get the old (or find another) compiler-version that we can use instead.

lasse50 at 2007-7-6 21:20:36 >

> The c-compiler we used in solaris 8 didn't behave (produce a code) like this.

Any C compiler conforming to any C standard just cant treat [b]string[/b] differently. strlen is a function from C standard library, its behavior is well-defined and in C99 is formulated this way:

"The strlen function returns the number of characters that precede the terminating NULL character".

You see, there is no mention of [i]"declared length"[/i].

You have been getting undefined behavior, probably due to the circumstances pointed out by Maxim.

regards,

__Fedor.

SFV at 2007-7-6 21:20:36 >