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#include <stdlib.h>
#include <string.h>
#include "gstack.h"
/** Add a new element onto the stack. If the copy function \c fn is \c
* NULL memcpy is used in its place. */
int gstack_push(struct gstack* s, unsigned datasize, const void* data,
adt_copy_fn* fn)
{
struct gstack_node* n;
if ((n = malloc(datasize + sizeof *n)) == 0) return 0;
if (fn == 0)
memcpy(n->data, data, datasize);
else if (!fn(n->data, data)) {
free(n);
return 0;
}
n->next = s->head;
s->head = n;
++s->count;
return 1;
}
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