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ISGRAPH(3P)                POSIX Programmer's Manual               ISGRAPH(3P)
PROLOG
       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
       isgraph, isgraph_l -- test for a visible character
SYNOPSIS
       #include <ctype.h>
       int isgraph(int c);
       int isgraph_l(int c, locale_t locale);
DESCRIPTION
       For isgraph(): The functionality described on this  reference  page  is
       aligned  with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This volume  of
       POSIX.1-2008 defers to the ISO C standard.
       The isgraph() and isgraph_l() functions shall test whether c is a char-
       acter of class graph in the current locale, or  in  the  locale  repre-
       sented  by  locale,  respectively;  see  the Base Definitions volume of
       POSIX.1-2008, Chapter 7, Locale.
       The c argument is an 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 behav-
       ior is undefined.
       The  behavior is undefined if the locale argument to isgraph_l() is the
       special locale object LC_GLOBAL_LOCALE or is not a valid locale  object
       handle.
RETURN VALUE
       The isgraph() and isgraph_l() functions shall return non-zero if c is a
       character with a visible representation; otherwise, they  shall  return
       0.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       To  ensure  applications  portability,  especially  across natural lan-
       guages, only these functions and the functions in the  reference  pages
       listed in the SEE ALSO section should be used for character classifica-
       tion.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       isalnum(),  isalpha(),  isblank(),  iscntrl(),  isdigit(),   islower(),
       isprint(),  ispunct(),  isspace(),  isupper(), isxdigit(), setlocale(),
       uselocale()
       The  Base  Definitions  volume  of  POSIX.1-2008,  Chapter  7,  Locale,
       <ctype.h>, <locale.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          ISGRAPH(3P)