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ctype.h(7posix) [posix man page]

<ctype.h>(P)						     POSIX Programmer's Manual						      <ctype.h>(P)

NAME

       ctype.h - character types

SYNOPSIS

       #include <ctype.h>

DESCRIPTION

       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 IEEE Std 1003.1-2001, Section 2.2, The Compilation Environment) to enable the visibility of
       these symbols in this header.

       The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

	      int   isalnum(int);
	      int   isalpha(int);

	      int   isascii(int);

	      int   isblank(int);
	      int   iscntrl(int);
	      int   isdigit(int);
	      int   isgraph(int);
	      int   islower(int);
	      int   isprint(int);
	      int   ispunct(int);
	      int   isspace(int);
	      int   isupper(int);
	      int   isxdigit(int);

	      int   toascii(int);

	      int   tolower(int);
	      int   toupper(int);

       The following are defined as macros:

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

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <locale.h>  ,  the  System  Interfaces  volume  of  IEEE Std 1003.1-2001, isalnum(), isalpha(), isascii(), iscntrl(), isdigit(), isgraph(),
       islower(), isprint(), ispunct(), isspace(), isupper(),  isxdigit(),  mblen(),  mbstowcs(),  mbtowc(),  setlocale(),  toascii(),	tolower(),
       _tolower(), toupper(), _toupper(), wcstombs(), wctomb()

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003							      <ctype.h>(P)

Check Out this Related Man Page

ISCNTRL(3P)						     POSIX Programmer's Manual						       ISCNTRL(3P)

PROLOG

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

NAME

       iscntrl - test for a control character

SYNOPSIS

       #include <ctype.h>

       int iscntrl(int c);

DESCRIPTION

       The iscntrl() function shall test whether c is a character of class cntrl in the program's current locale; see the Base Definitions  volume
       of IEEE Std 1003.1-2001, Chapter 7, Locale.

       The  c argument is a type int, the value of which the application shall ensure is a character representable as an unsigned char or equal to
       the value of the macro EOF. If the argument has any other value, the behavior is undefined.

RETURN VALUE

       The iscntrl() function shall return non-zero if c is a control character; otherwise, it shall return 0.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       To ensure applications portability, especially across natural languages, only this function and those listed in the SEE ALSO section should
       be used for character classification.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       isalnum(),  isalpha(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit(), setlocale(), the Base Defi-
       nitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003							       ISCNTRL(3P)
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