lib/libc/ctype.c

/*
 * Copyright (c) 2008 Travis Geiselbrecht
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include <ctype.h>

#if 0
/* XXX unimplemented for now */
int iscntrl(int c);
int isgraph(int c);
int isprint(int c);
int ispunct(int c);
#endif

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

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

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

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

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

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

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

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

int tolower(int c)
{
	if ((c >= 'A') && (c <= 'Z'))
		return c + ('a' - 'A');
	return c;
}

int toupper(int c)
{
	if ((c >= 'a') && (c <= 'z'))
		return c + ('A' - 'a');
	return c;
}