ctype.h(0p) — Linux manual page


ctype.h(0P)             POSIX Programmer's Manual            ctype.h(0P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

NAME         top

       ctype.h — character types

SYNOPSIS         top

       #include <ctype.h>

DESCRIPTION         top

       Some of the functionality described on this reference page
       extends the ISO C standard. Applications shall define the
       appropriate feature test macro (see the System Interfaces volume
       of POSIX.1‐2017, Section 2.2, The Compilation Environment) to
       enable the visibility of these symbols in this header.

       The <ctype.h> header shall define the locale_t type as described
       in <locale.h>, representing a locale object.

       The following shall be declared as functions and may also be
       defined as macros. Function prototypes shall be provided for use
       with ISO C standard compilers.

           int   isalnum(int);
           int   isalnum_l(int, locale_t);
           int   isalpha(int);
           int   isalpha_l(int, locale_t);
           int   isascii(int);
           int   isblank(int);
           int   isblank_l(int, locale_t);
           int   iscntrl(int);
           int   iscntrl_l(int, locale_t);
           int   isdigit(int);
           int   isdigit_l(int, locale_t);
           int   isgraph(int);
           int   isgraph_l(int, locale_t);
           int   islower(int);
           int   islower_l(int, locale_t);
           int   isprint(int);
           int   isprint_l(int, locale_t);
           int   ispunct(int);
           int   ispunct_l(int, locale_t);
           int   isspace(int);
           int   isspace_l(int, locale_t);
           int   isupper(int);
           int   isupper_l(int, locale_t);
           int   isxdigit(int);
           int   isxdigit_l(int, locale_t);
           int   toascii(int);
           int   tolower(int);
           int   tolower_l(int, locale_t);
           int   toupper(int);
           int   toupper_l(int, locale_t);

       The <ctype.h> header shall define the following as macros:

           int   _toupper(int);
           int   _tolower(int);

       The following sections are informative.



RATIONALE         top




SEE ALSO         top


       The System Interfaces volume of POSIX.1‐2017, Section 2.2, The
       Compilation Environment, isalnum(3p), isalpha(3p), isascii(3p),
       isblank(3p), iscntrl(3p), isdigit(3p), isgraph(3p), islower(3p),
       isprint(3p), ispunct(3p), isspace(3p), isupper(3p), isxdigit(3p),
       mblen(3p), mbstowcs(3p), mbtowc(3p), setlocale(3p), toascii(3p),
       tolower(3p), _tolower(3p), toupper(3p), _toupper(3p),
       wcstombs(3p), wctomb(3p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any
       discrepancy between this version and the original IEEE and The
       Open Group Standard, the original IEEE and The Open Group
       Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                       ctype.h(0P)

Pages that refer to this page: wchar.h(0p)wctype.h(0p)isalnum(3p)isalpha(3p)isascii(3p)isblank(3p)iscntrl(3p)isdigit(3p)isgraph(3p)islower(3p)isprint(3p)ispunct(3p)isspace(3p)isupper(3p)isxdigit(3p)toascii(3p)tolower(3p)_tolower(3p)toupper(3p)_toupper(3p)