Allocate space for a group of objects.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <stdlib.h>

void *calloc(size_t nmemb, size_t elemsize);

Parameters for this facility are:

nmemb	size_t	Number of elements
elemsize	size_t	The size of the elements

The calloc() function allocates contiguous space for nmemb elements of size elemsize. The space is initialized with all bits zero.

calloc() returns a pointer to the first byte of the memory area allocated. calloc() returns a null pointer (NULL) if no space could be allocated.

"vec_calloc"

"malloc"

"realloc"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main(void)
{
	static char s[] = "Metrowerks compilers";
	char *sptr1, *sptr2, *sptr3;

	// allocate the memory three different ways
	// one: allocate a thirty byte block of
	//	uninitialized memory
	sptr1 = (char *) malloc(30);
	strcpy(sptr1, s);
	printf("Address of sptr1: %p\n", sptr1);

	// two: allocate twenty bytes of unitialized memory
	sptr2 = (char *) malloc(20);
	printf("sptr2 before reallocation: %p\n", sptr2);
	strcpy(sptr2, s);
	// now re-allocate ten extra bytes (for a total of
	// thirty bytes)
	//
	// note that the memory block pointed to by sptr2 is
	// still contiguous after the call to realloc()
	sptr2 = (char *) realloc(sptr2, 30);
	printf("sptr2 after reallocation: %p\n", sptr2);

	// three: allocate thirty bytes of initialized memory
	sptr3 = (char *) calloc(strlen(s), sizeof(char));
	strcpy(sptr3, s);
	printf("Address of sptr3: %p\n", sptr3);

	puts(sptr1);
	puts(sptr2);
	puts(sptr3);

	// release the allocated memory to the heap
	free(sptr1);
	free(sptr2);
	free(sptr3);

	return 0;
}
Output:
Address of sptr1: 5e5432
sptr2 before reallocation: 5e5452
sptr2 after reallocation: 5e5468
Address of sptr3: 5e5488
Metrowerks compilers
Metrowerks compilers
Metrowerks compilers





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Last updated: August 16, 2000