src/libc/ctype.c


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#include <ctype.h>

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

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

int iscntrl(int c) {
	return c <= 0x1f || c == 0x7f;
}

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

int isgraph(int c) {
	return isalpha(c) || isdigit(c) || ispunct(c);
}

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

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

int ispunct(int c) {
	return ('!' <= c && c <= '/')
		|| (':' <= c && c <= '@')
		|| ('[' <= c && c <= '`')
		|| ('{' <= c && 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 ('0' <= c && c <= '9')
		|| ('A' <= c && c <= 'F')
		|| ('a' <= c && c <= 'f');
}

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

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