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48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
@c Documentation of gnulib module 'c-ctype'.
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@c Copyright (C) 2008-2017 Free Software Foundation, Inc.
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@c Permission is granted to copy, distribute and/or modify this document
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@c under the terms of the GNU Free Documentation License, Version 1.3 or
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@c any later version published by the Free Software Foundation; with no
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@c Invariant Sections, no Front-Cover Texts, and no Back-Cover
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@c Texts. A copy of the license is included in the ``GNU Free
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@c Documentation License'' file as part of this distribution.
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The @code{c-ctype} module contains functions operating on single-byte
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characters, like the functions in @code{<ctype.h>}, that operate as if the
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locale encoding was ASCII. (The "C" locale on many systems has the locale
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encoding "ASCII".)
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The functions are:
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@smallexample
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extern bool c_isascii (int c);
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extern bool c_isalnum (int c);
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extern bool c_isalpha (int c);
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extern bool c_isblank (int c);
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extern bool c_iscntrl (int c);
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extern bool c_isdigit (int c);
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extern bool c_islower (int c);
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extern bool c_isgraph (int c);
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extern bool c_isprint (int c);
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extern bool c_ispunct (int c);
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extern bool c_isspace (int c);
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extern bool c_isupper (int c);
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extern bool c_isxdigit (int c);
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extern int c_tolower (int c);
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extern int c_toupper (int c);
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@end smallexample
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These functions assign properties only to ASCII characters.
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The @var{c} argument can be a @code{char} or @code{unsigned char} value,
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whereas the corresponding functions in @code{<ctype.h>} take an argument
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that is actually an @code{unsigned char} value.
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The @code{c_is*} functions return @samp{bool}, where the corresponding
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functions in @code{<ctype.h>} return @samp{int} for historical reasons.
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Note: The @code{<ctype.h>} functions support only unibyte locales.
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