Movatterモバイル変換

wctrans(3p) — Linux manual page

WCTRANS(3P)             POSIX Programmer's ManualWCTRANS(3P)

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

       wctrans, wctrans_l — define character mapping

SYNOPSIS        top

       #include <wctype.h>       wctrans_t wctrans(const char *charclass);       wctrans_t wctrans_l(const char *charclass, locale_tlocale);

DESCRIPTION        top

       Forwctrans(): 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.1‐2017 defers to the ISO C       standard.       Thewctrans() andwctrans_l() functions are defined for valid       character mapping names identified in the current locale. Thecharclass is a string identifying a generic character mapping name       for which codeset-specific information is required. The following       character mapping names are defined in all locales:tolowerandtoupper.       These functions shall return a value of typewctrans_t, which can       be used as the second argument to subsequent calls oftowctrans()       andtowctrans_l().       Thewctrans() andwctrans_l() functions shall determine values ofwctrans_taccording to the rules of the coded character set       defined by character mapping information in the current locale or       in the locale represented bylocale, respectively (categoryLC_CTYPE).       The values returned bywctrans() shall be valid until a call tosetlocale() that modifies the categoryLC_CTYPE.       The values returned bywctrans_l() shall be valid only in calls totowctrans_l() with a locale represented bylocale with the sameLC_CTYPE category value.       The behavior is undefined if thelocale argument towctrans_l() is       the special locale object LC_GLOBAL_LOCALE or is not a valid       locale object handle.

RETURN VALUE        top

       Thewctrans() andwctrans_l() functions shall return 0 and may seterrno to indicate the error if the given character mapping name is       not valid for the current locale (categoryLC_CTYPE); otherwise,       they shall return a non-zero object of typewctrans_tthat can be       used in calls totowctrans() andtowctrans_l().

ERRORS        top

       These functions may fail if:EINVALThe character mapping name pointed to bycharclass is not              valid in the current locale.The following sections are informative.

EXAMPLES        top

       None.

APPLICATION USAGE        top

       None.

RATIONALE        top

       None.

FUTURE DIRECTIONS        top

       None.

SEE ALSO        top

towctrans(3p)       The Base Definitions volume of POSIX.1‐2017,wctype.h(0p)

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 athttp://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, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017WCTRANS(3P)

Pages that refer to this page:wctype.h(0p), towctrans(3p)

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.