[C] help with string handling memory leak Post: 302292415

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Top Forums Programming [C] help with string handling memory leak Post 302292415 by VRoemer on Friday 27th of February 2009 08:29:21 PM

02-27-2009

Registered User

[C] help with string handling memory leak

Ok, so I've been trying to figure out my fualt in this code for probably a week now.

Hopefully somebody will see what I couldn't see.

Anyways, any help would be greatly appreciated. Lets begin.

Code:

void serverStatus( const char* data )
{
    char* s          ;
    int   i, l = 0   ;
    char* tok        ;
    int   tokcount   ;
    hash_t srv[32]   ;
    bzero(srv, sizeof(srv));

    s = strdup( data+20 );
    strcpy(s, data+20);

    // Tokenize
    for(i = 0, tok = strtok( s, "\\"); tok; tok = strtok( NULL, "\\"))
    {
        l = ( l ? 0 : 1 );
        if( l ) // if its a variable
            strcpy( srv[i].key, tok );

        else    // if its a value
        {
            strcpy( srv[i].val, tok );
            ++i;
        }
    }

    // Dump server info
    tokcount = i;
    i = 0;
    while( i < tokcount )
    {
        if ( strncmp( srv[i].key, SRV_HOSTNAME, strlen(SRV_HOSTNAME) ) == 0 )
        {
            char* tmp = sanitizeString(srv[i].val);
            printf( "%s %s\n", srv[i].key, srv[i].val );
            free(tmp);
        }
        else if ( strncmp( srv[i].key, SRV_MAPNAME,  strlen(SRV_MAPNAME) ) == 0 )
        {
            printf( "%s %s\n", srv[i].key, srv[i].val );
        }        
        ++i;
    }
}

This is my code in question. Although I understand the problem could be prior in my network handling. ( we can explore more on this later. )

So what I know is that the code 'generally', if it does at all, crashes in the while loop.

Freeing my pointer 's' always crashes, ALWAYS. this bothers me a bit.

finally when i do print values, sometimes it prints stuff that isn't supposed to be there. ( ie memory issue )

the hash_t type looks as follows.

Code:

typedef struct info_s {
    char key[256];
    char val[256];
    } hash_t;

none of the values that we tokenize are larger than 255 characters.

Lastly full code is accessible if you would like to see it crash in real time.
( qquery.googlecode.com )

Thanks much for any insight you can provide.
~vroemer

VRoemer

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LEARN ABOUT X11R4

dellofig

DELLOFIG(3)						      MBK PHYSICAL FUNCTIONS						       DELLOFIG(3)

NAME

       dellofig - delete and free a logical figure

ORIGIN

       This  software  belongs	to  the  ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in
       Paris, France.

       Web : http://asim.lip6.fr/recherche/alliance/
       E-mail : alliance-users@asim.lip6.fr

SYNOPSYS

       #include "mlo.h"
       int dellofig(figname)
       char *figname;

PARAMETER

       figname		   Name of the figure to be deleted

DESCRIPTION

       dellofig deletes the figure called figname from the list of logical figure in memory. All the lists of elements belonging to the figure are
       also deleted and freed.

RETURN VALUE

       dellofig returns 1 if the figure was delete, and 0 if no figure called figname was present in memory.

EXAMPLE

       #include "mlo.h"
       void delete_na2_y()
       {
	  if (dellofig("na2_y"))
	     (void)fputs("deleted na2_y successfully", stdout);
	  else
	     (void)fputs("na2_y not present in ram !", stdout);
       }

SEE ALSO

       mbk(1), lofig(3), addlofig(3), getlofig(3), loadlofig(3), savelofig(3), flattenlofig(3), rflattenlofig(3).

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6							  October 1, 1997						       DELLOFIG(3)