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C

realloc ()


realloc () function modifies the allocated memory size by malloc () and calloc () functions to new size. If enough space doesn’t exist in memory of current block to extend, new block is allocated for the full size of reallocation, then copies the existing data to new block and then frees the old block.

Syntax:
ptr=realloc(ptr,newsize);


Example:

#include 
#include 
#include 

int main()
{
    char *mem_allocation;
    /* memory is allocated dynamically */
    mem_allocation = malloc( 20 * sizeof(char) );
    if( mem_allocation == NULL )
    {
        printf("Couldn't able to allocate requested memory\n");
    }
    else
    {
       strcpy( mem_allocation,"technicia.in");
    }
    printf("Dynamically allocated memory content  : " \
           "%s\n", mem_allocation );
    mem_allocation=realloc(mem_allocation,100*sizeof(char));
    if( mem_allocation == NULL )
    {
        printf("Couldn't able to allocate requested memory\n");
    }
    else
    {
        strcpy( mem_allocation,"space is extended upto " \
                               "100 characters");
    }
    printf("Resized memory : %s\n", mem_allocation );
    free(mem_allocation);
}
Output:

Dynamically allocated memory content : technicia.in
Resized memory : space is extended upto 100 characters


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