Thread: Help freeing allocated memory.

it has been long time since wrote in c, , i'm trying build vector.
wrote constructor , 'add' method.
want test , free allocated memory after using vector, keep getting segfault.
guess 'free' method wrong need game of pointers.
in advance.

php code:

/**** the vector type ****/
 
typedef struct _rds_vector_t
{
        void** objs; // the vector
        size_t size; // the size of the vector
        size_t numalloc; // number of allocated objects.
 
} rds_vector_t;
 
/**** the constructor ****/
rds_vector_t* rds_vector_new()
{
        rds_vector_t* new_vec;
        if((new_vec = (rds_vector_t*)malloc(sizeof(rds_vector_t))) == null)
                rds_vector_failure(__line__, "malloc failed.");
 
        new_vec->objs = null;
        new_vec->size = new_vec->numalloc = 0;
        
        return new_vec;
}
 
/**** add method ****/
void rds_vector_add(rds_vector_t* vec, void* obj)
{
        if(!vec->size)
        {
                if((vec->objs = (void**)malloc(sizeof(void*))) == null)
                        rds_vector_failure(__line__, "malloc failed.");
                vec->objs[0] = obj;
                vec->size = vec->numalloc = 1;
                return;
        }
 
        if (vec->size == vec->numalloc)
                rds_vector_amortization(vec);
 
        vec->objs[vec->numalloc++] = obj;
        return;
}

/**** free method ****/
void rds_vector_free(rds_vector_t* vec)
{
        size_t na = vec->numalloc, i;
 
        for(i=0; i<na; ++i)
        
                free(vec->objs[i]);
 
        free(vec->objs);
}
 
/**** main.c ****/
#include "rds_vector.h"
 
int main(int argc, char** argv)
{
        rds_vector_t* vec = rds_vector_new();
 
        char* arr0= "hello0";
        
        rds_vector_add(vec, arr0);
 
        rds_vector_free(vec);
 
        return exit_success;
} 


have day!

compile code using -g flag , use gdb step through code.
do:

code:

 gdb your_program break your_function, or file:line run

it tell when , segfault occurs.

should check tutorial gdb, useful tool. gets rid of lot of headaches in cases one.

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