NAME
tolower - transliterate uppercase characters to lowercase
SYNOPSIS
#include <ctype.h>
int tolower(int c);
DESCRIPTION
The tolower() function has as a domain a type int, the value of which
is representable as an unsigned char or the value of EOF. If the
argument has any other value, the behavior is undefined. If the
argument of tolower() represents an uppercase letter, and there exists
a corresponding lowercase letter (as defined by character type
information in the program locale category LC_CTYPE ), the result
shall be the corresponding lowercase letter. All other arguments in the
domain are returned unchanged.
RETURN VALUE
Upon successful completion, tolower() shall return the lowercase letter
corresponding to the argument passed; otherwise, it shall return the
argument unchanged.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
setlocale() , the Base Definitions volume of IEEE Std 1003.1-2001,
Chapter 7, Locale, <ctype.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .