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NetBSD 6.1.5 - man page for isalpha (netbsd section 3)

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ISALPHA(3)			   BSD Library Functions Manual 		       ISALPHA(3)

NAME
     isalpha -- alphabetic character test

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     isalpha(int c);

DESCRIPTION
     The isalpha() function tests for any character for which isupper(3) or islower(3) is true
     and for which none of iscntrl(3), isdigit(3), ispunct(3), or isspace(3) is true.  In the
     ``C'' locale, isalpha() returns true only for the characters for which isupper(3) or
     islower(3) is true.

RETURN VALUES
     The isalpha() function returns zero if the character tests false and returns non-zero if the
     character tests true.

SEE ALSO
     ctype(3), isalnum(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 isalpha() function conforms to ANSI X3.159-1989 (``ANSI C89'').

CAVEATS
     The argument to isalpha() must be EOF or representable as an unsigned char; otherwise, the
     behavior is undefined.  See the CAVEATS section of ctype(3) for more details.

BSD					  April 17, 2008				      BSD
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