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 9.0 April 17, 2008 NetBSD 9.0

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