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add small size init block for infinit mode

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <aitio.h>


int
main(int argc, char **argv)
{
	FILE *f;
	char b[BUFSIZ];
	void *p = NULL;

	if (argc < 2)
		f = io_fmapopen(NULL, 0, 0, PROT_READ | PROT_WRITE, 0, 2000);
	else
		f = io_fmapopen(argv[1], O_RDWR, 0, PROT_READ | PROT_WRITE, MAP_SHARED, 0);
	if (!f) {
		printf("Error:: #%d - %s\n", io_GetErrno(), io_GetError());
		return 1;
	}

	fwrite("123456789", 10, 1, f);
	fseek(f, 0, SEEK_SET);
	memset(b, 0, sizeof b);
	fread(b, sizeof b, 1, f);
	printf("b=%s\n", b);
//	fread(b, sizeof b, 1, f);
	fwrite("***", 4, 1, f);
	fwrite("*|\n", 3, 1, f);
	fseek(f, 100, SEEK_CUR);
	fwrite("oOo", 3, 1, f);
	fseek(f, -10, SEEK_END);
	fwrite("123456789", 10, 1, f);
	fseek(f, -10, SEEK_END);
	memset(b, 0, sizeof b);
	fread(b, sizeof b, 1, f);
	printf("2.b=%s\n", b);

	fclose(f);

	// part 2
	
	f = io_fmemopen(&p, 100);
	if (!f) {
		printf("Error:: #%d - %s\n", io_GetErrno(), io_GetError());
		return 2;
	}

	fwrite("123456789", 10, 1, f);
	fseek(f, 0, SEEK_SET);
	memset(b, 0, sizeof b);
	fread(b, sizeof b, 1, f);
	printf("b=%s\n", b);
//	fread(b, sizeof b, 1, f);
	fwrite("***", 4, 1, f);
	fwrite("*|\n", 3, 1, f);
	fseek(f, 100, SEEK_CUR);
	fwrite("oOo", 3, 1, f);
	fseek(f, -10, SEEK_END);
	fwrite("123456789", 10, 1, f);
	fseek(f, -10, SEEK_END);
	memset(b, 0, sizeof b);
	fread(b, sizeof b, 1, f);
	printf("2.b=%s\n", b);

	fclose(f);

	// part 3

	p = malloc(10000);
	f = io_fmemopen(&p, 10000);
	if (!f) {
		printf("Error:: #%d - %s\n", io_GetErrno(), io_GetError());
		return 3;
	}

	fwrite("123456789", 10, 1, f);
	fseek(f, 0, SEEK_SET);
	memset(b, 0, sizeof b);
	fread(b, sizeof b, 1, f);
	printf("b=%s\n", b);
//	fread(b, sizeof b, 1, f);
	fwrite("***", 4, 1, f);
	fwrite("*|\n", 3, 1, f);
	fseek(f, 100, SEEK_CUR);
	fwrite("oOo", 3, 1, f);
	fseek(f, -10, SEEK_END);
	fwrite("123456789", 10, 1, f);
	fseek(f, -10, SEEK_END);
	memset(b, 0, sizeof b);
	fread(b, sizeof b, 1, f);
	printf("2.b=%s\n", b);

	fclose(f);
	free(p);

	return 0;
}