@node Ctype
@chapter Character Type Macros and Functions (@file{ctype.h})
This chapter groups macros (which are also available as subroutines)
to classify characters into several categories (alphabetic,
numeric, control characters, whitespace, and so on), or to perform
simple character mappings.

The header file @file{ctype.h} defines the macros.
@menu
* Function isalnum::   Alphanumeric character predicate (isalnum, isalnum_l)
* Function isalpha::   Alphabetic character predicate (isalpha, isalpha_l)
* Function isascii::   ASCII character predicate (isascii, isascii_l)
* Function isblank::   Blank character predicate (isblank, isblank_l)
* Function iscntrl::   Control character predicate (iscntrl, iscntrl_l)
* Function isdigit::   Decimal digit predicate (isdigit, isdigit_l)
* Function islower::   Lowercase character predicate (islower, islower_l)
* Function isprint::   Printable character predicates (isprint, isprint_l. isgraph, isgraph_l)
* Function ispunct::   Punctuation character predicate (ispunct, ispunct_l)
* Function isspace::   Whitespace character predicate (isspace, isspace_l)
* Function isupper::   Uppercase character predicate (isupper, isupper_l)
* Function isxdigit::  Hexadecimal digit predicate (isxdigit, isxdigit_l)
* Function toascii::   Force integers to ASCII range (toascii, toascii_l)
* Function tolower::   Translate characters to lowercase (tolower, tolower_l)
* Function toupper::   Translate characters to uppercase (toupper, toupper_l)
* Function iswalnum::  Alphanumeric wide character predicate (iswalnum, iswalnum_l)
* Function iswalpha::  Alphabetic wide character predicate (iswalpha, iswalpha_l)
* Function iswblank::  Blank wide character predicate (iswblank, iswblank_l)
* Function iswcntrl::  Control wide character predicate (iswcntrl, iswcntrl_l)
* Function iswdigit::  Decimal digit wide character predicate (iswdigit, iswdigit_l)
* Function iswgraph::  Graphic wide character predicate (iswgraph, iswgraph_l)
* Function iswlower::  Lowercase wide character predicate (iswlower, iswlower_l)
* Function iswprint::  Printable wide character predicate (iswprint, iswprint_l)
* Function iswpunct::  Punctuation wide character predicate (iswpunct, iswpunct_l)
* Function iswspace::  Whitespace wide character predicate (iswspace, iswspace_l)
* Function iswupper::  Uppercase wide character predicate (iswupper, iswupper_l)
* Function iswxdigit:: Hexadecimal digit wide character predicate (iswxdigit, iswxdigit_l)
* Function iswctype::  Extensible wide-character test (iswctype, iswctype_l)
* Function wctype::    Compute wide-character test type (wctype, wctype_l)
* Function towlower::  Translate wide characters to lowercase (towlower, towlower_l)
* Function towupper::  Translate wide characters to uppercase (towupper, towupper_l)
* Function towctrans:: Extensible wide-character translation (towctrans, towctrans_l)
* Function wctrans::   Compute wide-character translation type (wctrans, wctrans_l)
@end menu

@page
@include ctype/isalnum.def

@page
@include ctype/isalpha.def

@page
@include ctype/isascii.def

@page
@include ctype/isblank.def

@page
@include ctype/iscntrl.def

@page
@include ctype/isdigit.def

@page
@include ctype/islower.def

@page
@include ctype/isprint.def

@page
@include ctype/ispunct.def

@page
@include ctype/isspace.def

@page
@include ctype/isupper.def

@page
@include ctype/isxdigit.def

@page
@include ctype/toascii.def

@page
@include ctype/tolower.def

@page
@include ctype/toupper.def

@page
@include ctype/iswalnum.def

@page
@include ctype/iswalpha.def

@page
@include ctype/iswcntrl.def

@page
@include ctype/iswblank.def

@page
@include ctype/iswdigit.def

@page
@include ctype/iswgraph.def

@page
@include ctype/iswlower.def

@page
@include ctype/iswprint.def

@page
@include ctype/iswpunct.def

@page
@include ctype/iswspace.def

@page
@include ctype/iswupper.def

@page
@include ctype/iswxdigit.def

@page
@include ctype/iswctype.def

@page
@include ctype/wctype.def

@page
@include ctype/towlower.def

@page
@include ctype/towupper.def

@page
@include ctype/towctrans.def

@page
@include ctype/wctrans.def