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ISALNUM(3P) POSIX Programmer's Manual ISALNUM(3P)
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.
isalnum, isalnum_l — test for an alphanumeric character
#include <ctype.h>
int isalnum(int c);
int isalnum_l(int c, locale_t locale);
For isalnum(): 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 isalnum() and isalnum_l() functions shall test whether c is a
character of class alpha or digit in the current locale, or in the
locale represented 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 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.
The behavior is undefined if the locale argument to isalnum_l() is
the special locale object LC_GLOBAL_LOCALE or is not a valid locale
object handle.
The isalnum() and isalnum_l() functions shall return non-zero if c is
an alphanumeric character; otherwise, they shall return 0.
No errors are defined.
The following sections are informative.
None.
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.
None.
None.
isalpha(3p), isblank(3p), iscntrl(3p), isdigit(3p), isgraph(3p),
islower(3p), isprint(3p), ispunct(3p), isspace(3p), isupper(3p),
isxdigit(3p), setlocale(3p), uselocale(3p)
The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale,
ctype.h(0p), stdio.h(0p)
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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 ISALNUM(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)