toupper(3) - NetBSD Manual Pages

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TOUPPER(3)              NetBSD Library Functions Manual             TOUPPER(3)


NAME

     toupper -- lower case to upper case letter conversion


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ctype.h>

     int
     toupper(int c);


DESCRIPTION

     The toupper() function converts a lower-case letter to the corresponding
     upper-case letter.


RETURN VALUES

     If the argument is a lower-case letter, the toupper() function returns
     the corresponding upper-case letter if there is one; otherwise the argu-
     ment is returned unchanged.


SEE ALSO

     ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3),
     isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
     isxdigit(3), stdio(3), toascii(3), ascii(7)


STANDARDS

     The toupper() function conforms to ANSI X3.159-1989 (``ANSI C89'').


CAVEATS

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

NetBSD 10.1                     April 17, 2008                     NetBSD 10.1