src/user/ctype.nsc

/*
 * ctype.h coverage -- plain ascii only (no locale, no unicode: nothing
 * in kaboom's kernel or userspace has ever needed either), each
 * function a straight literal ascii range check, no lookup table
 * (nsc has no static const array initializers to build one from
 * anyway).
 */
 
global i32
is_digit(u8 c)
{
	if(c >= (u8)48 && c <= (u8)57)
	{
		return 1;
	}
	return 0;
}
 
global i32
is_upper(u8 c)
{
	if(c >= (u8)65 && c <= (u8)90)
	{
		return 1;
	}
	return 0;
}
 
global i32
is_lower(u8 c)
{
	if(c >= (u8)97 && c <= (u8)122)
	{
		return 1;
	}
	return 0;
}
 
global i32
is_alpha(u8 c)
{
	if(is_upper(c) == 1 || is_lower(c) == 1)
	{
		return 1;
	}
	return 0;
}
 
global i32
is_alnum(u8 c)
{
	if(is_alpha(c) == 1 || is_digit(c) == 1)
	{
		return 1;
	}
	return 0;
}
 
global i32
is_space(u8 c)
{
	if(c == (u8)32 || c == (u8)9 || c == (u8)10 || c == (u8)13 || c == (u8)11 || c == (u8)12)
	{
		return 1;
	}
	return 0;
}
 
global u8
to_upper(u8 c)
{
	if(is_lower(c) == 1)
	{
		return c - (u8)32;
	}
	return c;
}
 
global u8
to_lower(u8 c)
{
	if(is_upper(c) == 1)
	{
		return c + (u8)32;
	}
	return c;
}