banan-os/kernel/klibc/ctype.cpp

#include <ctype.h>

int isalnum(int c)
{
	return isdigit(c) || isalpha(c);
}

int isalpha(int c)
{
	return islower(c) || isupper(c);
}

int isascii(int c)
{
	return c <= 0x7F;
}

int isblank(int c)
{
	return c == ' ' || c == '\t';
}

int iscntrl(int c)
{
	return c < 32 || c == 0x7F;
}

int isdigit(int c)
{
	return '0' <= c && c <= '9';
}

int isgraph(int c)
{
	return 0x21 <= c && c <= 0x7E;
}

int islower(int c)
{
	return 'a' <= c && c <= 'z';
}

int isprint(int c)
{
	return isgraph(c) || c == ' ';
}

int ispunct(int c)
{
	return isgraph(c) && !isalnum(c);
}

int isspace(int c)
{
	return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v';
}

int isupper(int c)
{
	return 'A' <= c && c <= 'Z';
}

int isxdigit(int c)
{
	return isdigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F');
}

int toupper(int c)
{
	if (!islower(c))
		return c;
	return 'A' + (c - 'a');
}

int tolower(int c)
{
	if (!isupper(c))
		return c;
	return 'a' + (c - 'A');
}