ISALNUM(3) BSD Programmer's Manual ISALNUM(3)
isalnum - alphanumeric character test
#include <ctype.h> int isalnum(int c);
The isalnum() macro tests for any character for which isalpha(3) or isdigit(3) is true.
The isalnum() macro returns zero if the character tests false or non-zero if the character tests true.
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)
The isalnum() function conforms to ANSI X3.159-1989 ("ANSI C").
The argument to isalnum() must be EOF or representable as an unsigned char; otherwise, the result is undefined. MirOS BSD #10-current June 29, 1991 1
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