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# realloc

Memory Allocation Functions

Reallocates (adjusts the size of) a block of memory.

    void *realloc( void *mem_address, size_t size);

mem_address | The name of the block of memory whose size is changed.
size | The size in bytes of the block of memory requested.

## Return Values

Returns a void * type pointer to the allocated space. If the system could not allocate the requested block of memory or if any of the parameters was 0, returns a NULL pointer.

For realloc details, refer to your C language documentation.

## Example

In the following example, realloc enlarges a previously allocated buffer, buf, of length 1024, to a length of 2048 bytes.

Copy code

    #include <malloc.h>
        char * buf, * biggerbuf;
        if ((buf = (char *)malloc(1024, sizeof(char))) == NULL) {
            lr_output_message ("Insufficient memory available");
            return -1;
        }
        lr_output_message ("Memory allocated. Buffer address = %.8x", buf);
        // Now reallocate buf to size of 2048 bytes
        if ((biggerbuf = (char *)realloc(buf, 2048)) == NULL) {
            lr_output_message ("Unable to re-allocate memory");
            return -1;
        }
        buf = biggerbuf;
        lr_output_message ("Memory reallocated. Buffer address = %.8x", buf);
        // Do something with the buffer here ...
        // Now free the buffer
        free(buf);

    Example: Output:
    Action.c(11): Memory allocated. Buffer address = 007b9d88
    Action.c(20): Memory reallocated. Buffer address = 007b9d88

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