CTYPE(3)               FreeBSD Library Functions Manual               CTYPE(3)

NAME
     digittoint, isalnum, isalpha, isascii, isblank, iscntrl, isdigit,
     isgraph, ishexnumber, isideogram, islower, isnumber, isphonogram,
     isprint, ispunct, isrune, isspace, isspecial, isupper, isxdigit, toascii,
     tolower, toupper - character classification functions

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     digittoint(int c);

     int
     isalnum(int c);

     int
     isalpha(int c);

     int
     isascii(int c);

     int
     iscntrl(int c);

     int
     isdigit(int c);

     int
     isgraph(int c);

     int
     ishexnumber(int c);

     int
     isideogram(int c);

     int
     islower(int c);

     int
     isnumber(int c);

     int
     isphonogram(int c);

     int
     isspecial(int c);

     int
     isprint(int c);

     int
     ispunct(int c);

     int
     isrune(int c);

     int
     isspace(int c);

     int
     isupper(int c);

     int
     isxdigit(int c);

     int
     toascii(int c);

     int
     tolower(int c);

     int
     toupper(int c);

DESCRIPTION
     The above functions perform character tests and conversions on the
     integer c.  They are available as macros, defined in the include file
     <ctype.h>, or as true functions in the C library.  See the specific
     manual pages for more information.

SEE ALSO
     digittoint(3), isalnum(3), isalpha(3), isascii(3), isblank(3),
     iscntrl(3), isdigit(3), isgraph(3), isideogram(3), islower(3),
     isphonogram(3), isprint(3), ispunct(3), isrune(3), isspace(3),
     isspecial(3), isupper(3), isxdigit(3), toascii(3), tolower(3),
     toupper(3), wctype(3), ascii(7)

STANDARDS
     These functions, except for digittoint(), isascii(), ishexnumber(),
     isideogram(), isnumber(), isphonogram(), isrune(), isspecial() and
     toascii(), conform to ISO/IEC 9899:1990 ("ISO C90").

FreeBSD 13.1-RELEASE-p6         March 30, 2004         FreeBSD 13.1-RELEASE-p6