iswctype.3p (6132B)
- '\" et
- .TH ISWCTYPE "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
- .\"
- .SH 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.
- .\"
- .SH NAME
- iswctype,
- iswctype_l
- \(em test character for a specified class
- .SH SYNOPSIS
- .LP
- .nf
- #include <wctype.h>
- .P
- int iswctype(wint_t \fIwc\fP, wctype_t \fIcharclass\fP);
- int iswctype_l(wint_t \fIwc\fP, wctype_t \fIcharclass\fP,
- locale_t \fIlocale\fP);
- .fi
- .SH DESCRIPTION
- For
- \fIiswctype\fR():
- 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\(hy2017 defers to the ISO\ C standard.
- .P
- The
- \fIiswctype\fR()
- and
- \fIiswctype_l\fR()
- functions shall determine whether the wide-character code
- .IR wc
- has the character class
- .IR charclass ,
- returning true or false. The
- \fIiswctype\fR()
- and
- \fIiswctype_l\fR()
- functions are defined on WEOF and wide-character codes corresponding to
- the valid character encodings in the current locale, or
- in the locale represented by
- .IR locale ,
- respectively. If the
- .IR wc
- argument is not in the domain of the function, the result is undefined.
- If the value of
- .IR charclass
- is invalid (that is, not obtained by a call to
- \fIwctype\fR()
- or
- .IR charclass
- is invalidated by a subsequent call to
- \fIsetlocale\fR()
- that has affected category
- .IR LC_CTYPE )
- the result is unspecified.
- .P
- The behavior is undefined if the
- .IR locale
- argument to
- \fIiswctype_l\fR()
- is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
- object handle.
- .SH "RETURN VALUE"
- The
- \fIiswctype\fR()
- and
- \fIiswctype_l\fR()
- functions shall return non-zero (true) if and only if
- .IR wc
- has the property described by
- .IR charclass .
- If
- .IR charclass
- is (\c
- .BR wctype_t )0,
- these functions shall return 0.
- .SH ERRORS
- No errors are defined.
- .LP
- .IR "The following sections are informative."
- .SH EXAMPLES
- .SS "Testing for a Valid Character"
- .sp
- .RS 4
- .nf
- #include <wctype.h>
- \&...
- int yes_or_no;
- wint_t wc;
- wctype_t valid_class;
- \&...
- if ((valid_class=wctype("vowel")) == (wctype_t)0)
- /* Invalid character class. */
- yes_or_no=iswctype(wc,valid_class);
- .fi
- .P
- .RE
- .SH "APPLICATION USAGE"
- The twelve strings
- .BR \(dqalnum\(dq ,
- .BR \(dqalpha\(dq ,
- .BR \(dqblank\(dq ,
- .BR \(dqcntrl\(dq ,
- .BR \(dqdigit\(dq ,
- .BR \(dqgraph\(dq ,
- .BR \(dqlower\(dq ,
- .BR \(dqprint\(dq ,
- .BR \(dqpunct\(dq ,
- .BR \(dqspace\(dq ,
- .BR \(dqupper\(dq ,
- and
- .BR \(dqxdigit\(dq
- are reserved for the standard character classes. In the table below,
- the functions in the left column are equivalent to the functions in the
- right column.
- .sp
- .RS 4
- .nf
- iswalnum(\fIwc\fP) iswctype(\fIwc\fP, wctype("alnum"))
- iswalnum_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("alnum"), \fIlocale\fP)
- iswalpha(\fIwc\fP) iswctype(\fIwc\fP, wctype("alpha"))
- iswalpha_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("alpha"), \fIlocale\fP)
- iswblank(\fIwc\fP) iswctype(\fIwc\fP, wctype("blank"))
- iswblank_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("blank"), \fIlocale\fP)
- iswcntrl(\fIwc\fP) iswctype(\fIwc\fP, wctype("cntrl"))
- iswcntrl_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("cntrl"), \fIlocale\fP)
- iswdigit(\fIwc\fP) iswctype(\fIwc\fP, wctype("digit"))
- iswdigit_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("digit"), \fIlocale\fP)
- iswgraph(\fIwc\fP) iswctype(\fIwc\fP, wctype("graph"))
- iswgraph_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("graph"), \fIlocale\fP)
- iswlower(\fIwc\fP) iswctype(\fIwc\fP, wctype("lower"))
- iswlower_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("lower"), \fIlocale\fP)
- iswprint(\fIwc\fP) iswctype(\fIwc\fP, wctype("print"))
- iswprint_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("print"), \fIlocale\fP)
- iswpunct(\fIwc\fP) iswctype(\fIwc\fP, wctype("punct"))
- iswpunct_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("punct"), \fIlocale\fP)
- iswspace(\fIwc\fP) iswctype(\fIwc\fP, wctype("space"))
- iswspace_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("space"), \fIlocale\fP)
- iswupper(\fIwc\fP) iswctype(\fIwc\fP, wctype("upper"))
- iswupper_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("upper"), \fIlocale\fP)
- iswxdigit(\fIwc\fP) iswctype(\fIwc\fP, wctype("xdigit"))
- iswxdigit_l(\fIwc\fP, \fIlocale\fP) iswctype_l(\fIwc\fP, wctype("xdigit"), \fIlocale\fP)
- .fi
- .P
- .RE
- .SH RATIONALE
- None.
- .SH "FUTURE DIRECTIONS"
- None.
- .SH "SEE ALSO"
- .IR "\fIiswalnum\fR\^(\|)",
- .IR "\fIiswalpha\fR\^(\|)",
- .IR "\fIiswcntrl\fR\^(\|)",
- .IR "\fIiswdigit\fR\^(\|)",
- .IR "\fIiswgraph\fR\^(\|)",
- .IR "\fIiswlower\fR\^(\|)",
- .IR "\fIiswprint\fR\^(\|)",
- .IR "\fIiswpunct\fR\^(\|)",
- .IR "\fIiswspace\fR\^(\|)",
- .IR "\fIiswupper\fR\^(\|)",
- .IR "\fIiswxdigit\fR\^(\|)",
- .IR "\fIsetlocale\fR\^(\|)",
- .IR "\fIuselocale\fR\^(\|)",
- .IR "\fIwctype\fR\^(\|)"
- .P
- The Base Definitions volume of POSIX.1\(hy2017,
- .IR "\fB<locale.h>\fP",
- .IR "\fB<wctype.h>\fP"
- .\"
- .SH COPYRIGHT
- 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 .
- .PP
- 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 .