The standard C library memory allocation functions (malloc,
calloc, realloc, and free) are available in
foreign code, but cannot reuse any free memory that SICStus Prolog's
memory manager may have available, and so may contribute to memory
fragmentation.
The following functions provide the same services via SICStus Prolog's memory manager.
void * SP_malloc(size_t size)
size
bytes.
void * SP_calloc(size_t nmemb, size_t size)
Returns a pointer to a block of at least size *
nemb. The first size * nmemb bytes are set to zero.
void * SP_realloc(void *ptr, size_t size)
ptr to size
bytes and returns a pointer to the (possibly moved) block. The contents
will be unchanged up to the lesser of the new and old sizes. The block
referenced by ptr must have been obtained by a call to
SP_malloc() or SP_realloc(), and must not have been released
by a call to SP_free() or SP_realloc().
void SP_free(void *ptr)
ptr, which must have been
obtained by a call to SP_malloc() or SP_realloc(), and must
not have been released by a call to SP_free() or SP_realloc().
char * SP_strdup(const char *str)
Returns a pointer to a new string, which is a duplicate of the string
pointer to by str. The memory for the new string is allocated
using SP_malloc().