conditional run time settings

[userx51]

In my keil program, during the run time I like in my code to check a value and come up with the following:

depending on a variable, var1 , bypass one of the settings[] in below.like if var1 = 1, the settings would be the first one and if var = 2,the settings would be the second one.

struct SS
{
	int a,b,c,d;
};

static SS code settings[] =
{
	{1,2,3,4},
	{5,6,7,8}
};

static SS code settings[] =
{
	{1,2,3,4},
	{5,6,7,8},
	{9,10,11,12}
};

and also,

#define arrsz 10

if var = 2, arrsz for xbuf change to 20.

unsigned char xdata xbuf[arrsz];