/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _CTYPE_H
#define _CTYPE_H
#include <slibc/version.h>
#include <slibc/features.h>
#ifndef _SLIBC_SUPPRESS_WARNINGS
# warning "Functions in <ctype.h>, 'isascii' and 'toascii', only support ASCII."
# warning "Functions in <ctype.h>, do not support wider characets than 8 bits."
#endif
/**
* Check whether a character is an alphabetical
* character or a decimal digit.
*
* @param c The character.
* @return Whether the character is in
* ['0', '9'], ['A', 'Z'], or ['a', 'z'].
*/
int (isalnum)(int) /* [0x30, 0x39], [0x41, 0x5A], [0x61, 0x7A] */
__GCC_ONLY(__attribute__((const)));
#if defined (__GNUC__)
# define isalnum(c) \
({ int __c = (c); (isalpha(__c) || isdigit(__c)); })
#endif
/**
* Check whether a character is an alphabetical character.
*
* @param c The character.
* @return Whether the character is in
* ['A', 'Z'] or ['a', 'z'].
*/
int (isalpha)(int) /* [0x41, 0x5A], [0x61, 0x7A] */
__GCC_ONLY(__attribute__((const)));
#define isalpha(c) (islower(tolower(c)))
#ifdef _GNU_SOURCE
/**
* Check whether a character is a regular blank space
* or a horizontal tabulation.
*
* This is a GNU extension.
*
* @param c The character.
* @return Whether the character is a ' ' or a '\t'.
*/
int (isblank)(int) /* ' ', '\t' */
__GCC_ONLY(__attribute__((const)));
# if defined(__GNUC__)
# define isblank(c) \
({ int __c = (c); ((__c == ' ') || (__c == '\t')); })
# endif
#endif
/**
* Check whether a character is a non-printable
* ASCII character.
*
* @param c The character.
* @return Whether the character is lower than ' ',
* or is 0x7F.
*/
int (iscntrl)(int) /* [0x00, 0x1F], 0x7F */
__GCC_ONLY(__attribute__((const)));
#if defined(__GNUC__)
# define iscntrl(c) \
({ int __c = (c); (((unsigned)__c < ' ') || (__c == 0x7F)); })
#endif
/**
* Check whether a character is a decimal digit.
*
* @param c The character.
* @return Whether the character is in ['0', '9'].
*/
int (isdigit)(int) /* [0x30, 0x39] */
__GCC_ONLY(__attribute__((const)));
#define isdigit(c) (int)((unsigned)((c) - '0') < 10)
/**
* Check whether a character is has a printable glyph.
*
* @param c The character.
* @return Whether the character is greater
* than ' ', but is not 0x7F.
*/
int (isgraph)(int) /* [0x21, 0x7E] */
__GCC_ONLY(__attribute__((const)));
#define isgraph(c) (int)((unsigned)(c - 0x21) < 0x5E)
/**
* Check whether a character is a lowercase
* alphabetical character.
*
* @param c The character.
* @return Whether the character is in ['a', 'z'].
*/
int (islower)(int) /* [0x61, 0x7A] */
__GCC_ONLY(__attribute__((const)));
#define islower(c) (int)((unsigned)((c) - 'a') < 26)
/**
* Check whether a character is has a printable glyph
* or a blank space.
*
* @param c The character.
* @return Whether the character is at least
* as great as ' ', but is not 0x7F.
*/
int (isprint)(int) /* [0x20, 0x7E] */
__GCC_ONLY(__attribute__((const)));
#define isprint(c) (int)((unsigned)(c - 0x20) < 0x5F)
/**
* Check whether a character is has a punctuation,
* that is, a printable character but a blank space,
* numerical or alphabetical.
*
* @param c The character.
* @return Whether the character is a punctuation.
*/
int (ispunct)(int) /* isprint && !isalnum && !isspace) */
__GCC_ONLY(__attribute__((const)));
#if defined (__GNUC__)
# define ispunk(c) \
({ int __c = (c); (isprint(__c) && !isalnum(__c) && !isspace(__c)); })
#endif
/**
* Check whether a character is a whitespace character.
*
* @param c The character.
* @return Whether the character is a ' ', '\f',
* '\n', '\r', '\t', or '\v'.
*/
int (isspace)(int) /* 0x20, [0x09, 0x0D] */
__GCC_ONLY(__attribute__((const)));
#if defined (__GNUC__)
# define isspace(c) \
({ int __c = (c); ((__c == ' ') || ((unsigned)(__c - '\t') < 5)); })
#endif
/**
* Check whether a character is an uppercase
* alphabetical character.
*
* @param c The character.
* @return Whether the character is in ['A', 'Z'].
*/
int (isupper)(int) /* [0x41, 0x5A] */
__GCC_ONLY(__attribute__((const)));
#define isupper(c) (int)((unsigned)((c) - 'A') < 26)
/**
* Check whether a character is an ASCII
* hexadecimal digit. Both uppercase and
* lowercase is supported.
*
* @param c The character.
* @return Whether the character is in
* ['0', '9'], ['A', 'Z'], or ['a', 'z'].
*/
int (isxdigit)(int) /* [0x30, 0x39], [0x41, 0x46], [0x61, 0x66] */
__GCC_ONLY(__attribute__((const)));
#if defined (__GNUC__)
# define isxdigit(c) \
({ int __c = (c); (isdigit(__c) && (tolower(__c) - 'a' < 6)); })
#endif
/**
* Convert a uppercase ASCII character to
* an lowercase ASCII character.
*
* The function's behaviour is unspecifed
* of the character is not alphabetical.
* You should consider running
* `(isupper(c) ? tolower(c) : c)` instead.
*
* @param c The character.
* @return The character in lowercase.
* Guaranteed to be unchanged if the
* character already is in lowercase.
*/
int (tolower)(int) /* [0x41, 0x5A] -> [0x61, 0x7A] */
__GCC_ONLY(__attribute__((const)));
#define tolower(c) (int)((unsigned)(c) | 0x20)
/**
* Convert a lowercase ASCII character to
* an uppercase ASCII character.
*
* The function's behaviour is unspecifed
* of the character is not alphabetical.
* You should consider running
* `(isupper(c) ? tolower(c) : c)` instead.
*
* @param c The character.
* @return The character in uppercase.
* Guaranteed to be unchanged if the
* character already is in lowercase.
*/
int (toupper)(int) /* [0x61, 0x7A] -> [0x41, 0x5A] */
__GCC_ONLY(__attribute__((const)));
#define toupper(c) (int)((unsigned)(c) & (unsigned)~0x20)
/**
* Check whether a character is an ASCII character.
*
* @param c The character
* @return - Whether the character is an ASCII character.
*/
int (isascii)(int) /* [0x00, 0x7E] */
__GCC_ONLY(__attribute__((const)));
#define isascii(c) (int)((unsigned)(c) < 0x7F)
/**
* Remove the 8:th bit from a character.
*
* Note that this does not make a proper character set
* convertion and the result is virtually arbitrary.
*
* @param c The character.
* @param c The character with the 8:th bit cleared.
*/
int (toascii)(int)
__warning("Using 'toascii' is, generally, unwise.")
__GCC_ONLY(__attribute__((const)));
#if defined(_SLIBC_SUPPRESS_WARNINGS)
# define toascii(c) (int)((unsigned)(c) & 0x7F)
#endif
/**
* This function is identical to `tolower`.
* It is provided for backwards-compatibility with SVID.
*/
int _tolower(int)
__deprecated("Use 'tolower' instead.")
__GCC_ONLY(__attribute__((const)));
/**
* This function is identical to `tolower`.
* It is provided for backwards-compatibility with SVID.
*/
int _toupper(int)
__deprecated("Use 'toupper' instead.")
__GCC_ONLY(__attribute__((const)));
/* TODO _l variants */
#endif
