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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 @c Documentation of gnulib module 'c-ctype'.
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2
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3 @c Copyright (C) 2008-2019 Free Software Foundation, Inc.
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4
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5 @c Permission is granted to copy, distribute and/or modify this document
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6 @c under the terms of the GNU Free Documentation License, Version 1.3 or
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7 @c any later version published by the Free Software Foundation; with no
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8 @c Invariant Sections, no Front-Cover Texts, and no Back-Cover
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9 @c Texts. A copy of the license is included in the ``GNU Free
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10 @c Documentation License'' file as part of this distribution.
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11
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12 The @code{c-ctype} module contains functions operating on single-byte
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13 characters, like the functions in @code{<ctype.h>}, that operate as if the
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14 locale encoding was ASCII. (The "C" locale on many systems has the locale
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15 encoding "ASCII".)
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16
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17 The functions are:
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18 @smallexample
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19 extern bool c_isascii (int c);
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20
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21 extern bool c_isalnum (int c);
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22 extern bool c_isalpha (int c);
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23 extern bool c_isblank (int c);
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24 extern bool c_iscntrl (int c);
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25 extern bool c_isdigit (int c);
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26 extern bool c_islower (int c);
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27 extern bool c_isgraph (int c);
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28 extern bool c_isprint (int c);
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29 extern bool c_ispunct (int c);
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30 extern bool c_isspace (int c);
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31 extern bool c_isupper (int c);
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32 extern bool c_isxdigit (int c);
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33
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34 extern int c_tolower (int c);
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35 extern int c_toupper (int c);
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36 @end smallexample
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37
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38 These functions assign properties only to ASCII characters.
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40 The @var{c} argument can be a @code{char} or @code{unsigned char} value,
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41 whereas the corresponding functions in @code{<ctype.h>} take an argument
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42 that is actually an @code{unsigned char} value.
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44 The @code{c_is*} functions return @samp{bool}, where the corresponding
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45 functions in @code{<ctype.h>} return @samp{int} for historical reasons.
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46
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47 Note: The @code{<ctype.h>} functions support only unibyte locales.