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isalnum(3p) — Linux manual page

PROLOG \|NAME \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|EXAMPLES \|APPLICATION USAGE \|RATIONALE \|FUTURE DIRECTIONS \|SEE ALSO \|COPYRIGHT

ISALNUM(3P)             POSIX Programmer's ManualISALNUM(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

       isalnum, isalnum_l — test for an alphanumeric character

SYNOPSIS top

       #include <ctype.h>       int isalnum(intc);       int isalnum_l(intc, locale_tlocale);

DESCRIPTION top

       Forisalnum(): 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.       Theisalnum() andisalnum_l() functions shall test whetherc is a       character of classalphaordigitin the current locale, or in the       locale represented bylocale, respectively; see the Base       Definitions volume of POSIX.1‐2017,Chapter 7,Locale.       Thec argument is anint, the value of which the application shall       ensure is representable as anunsigned charor equal to the value       of the macro EOF. If the argument has any other value, the       behavior is undefined.       The behavior is undefined if thelocale argument toisalnum_l() is       the special locale object LC_GLOBAL_LOCALE or is not a valid       locale object handle.

RETURN VALUE top

       Theisalnum() andisalnum_l() functions shall return non-zero ifc       is an alphanumeric character; otherwise, they shall return 0.

ERRORS top

       No errors are defined.The following sections are informative.

EXAMPLES top

       None.

APPLICATION USAGE top

       To ensure applications portability, especially across natural       languages, only these functions and the functions in the reference       pages listed in the SEE ALSO section should be used for character       classification.

RATIONALE top

       None.

FUTURE DIRECTIONS top

       None.

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                2017ISALNUM(3P)

Pages that refer to this page:ctype.h(0p), isalpha(3p), isblank(3p), iscntrl(3p), isdigit(3p), isgraph(3p), islower(3p), isprint(3p), ispunct(3p), isspace(3p), isupper(3p), isxdigit(3p), setlocale(3p)