04-30-2002
I still don't understand what the issue is but you can look at:
isalpha(c)
islower(c)
tolower(c)
isupper(c)
toupper(c)
isdigit(c)
isalnum(c)
and maybe use a combination or one or several to get what you want...(ex, if isalpha() returns TRUE(non-zero) then use tolower(c) make make all entries lowercase then do your comparison...)
Good luck.
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CTYPE(3) Library Functions Manual CTYPE(3)
NAME
isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii -
character classification macros
SYNOPSIS
#include <ctype.h>
isalpha(c)
. . .
DESCRIPTION
These macros classify ASCII-coded integer values by table lookup. Each is a predicate returning nonzero for true, zero for false. Isascii
and toascii are defined on all integer values; the rest are defined only where isascii is true and on the single non-ASCII value EOF (see
stdio(3S)).
isalpha c is a letter
isupper c is an upper case letter
islower c is a lower case letter
isdigit c is a digit
isxdigit c is a hex digit
isalnum c is an alphanumeric character
isspace c is a space, tab, carriage return, newline, vertical tab, or formfeed
ispunct c is a punctuation character (neither control nor alphanumeric)
isprint c is a printing character, code 040(8) (space) through 0176 (tilde)
isgraph c is a printing character, similar to isprint except false for space.
iscntrl c is a delete character(0177) or ordinary control character (less than 040).
isascii c is an ASCII character, code less than 0200
tolower c is converted to lower case. Return value is undefined if not isupper(c).
toupper c is converted to upper case. Return value is undefined if not islower(c).
toascii c is converted to be a valid ascii character.
SEE ALSO
ascii(7)
7th Edition May 12, 1986 CTYPE(3)