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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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ctype.h(0P) POSIX Programmer's Manual ctype.h(0P)
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.
ctype.h — character types
#include <ctype.h>
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.
None.
None.
None.
locale.h(0p)
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)
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)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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