isalnum(3) - NetBSD Manual Pages

ISALNUM(3)              NetBSD Library Functions Manual             ISALNUM(3)


NAME
isalnum - alphanumeric character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h> int isalnum(int c);
DESCRIPTION
The isalnum() macro tests for any character for which isalpha(3) or isdigit(3) is true.
RETURN VALUES
The isalnum() macro returns zero if the character tests false and returns non-zero if the character tests true.
SEE ALSO
isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
STANDARDS
The isalnum() function conforms to ANSI X3.159-1989 (``ANSI C'').
CAVEATS
The argument to isalnum() must be EOF or representable as an unsigned char; otherwise, the result is undefined. NetBSD 2.0 June 29, 1991 NetBSD 2.0

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