'\" te
.\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
.\"  Copyright (c) 2002, Sun Microsystems, Inc.  All Rights Reserved
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.TH TOLOWER 3C "Jun 21, 2014"
.SH NAME
tolower, tolower_l \- transliterate upper-case characters to lower-case
.SH SYNOPSIS
.LP
.nf
#include <ctype.h>

\fBint\fR \fBtolower\fR(\fBint\fR \fIc\fR);
.fi
.LP
.nf
\fBint\fR \fBtolower_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
.fi

.SH DESCRIPTION
.LP
The \fBtolower()\fR function has as a domain a type \fBint\fR, the value of
which is representable as an \fBunsigned char\fR or the value of \fBEOF\fR. If
the argument has any other value, the argument is returned unchanged. If the
argument of \fBtolower()\fR represents an upper-case letter, and there exists a
corresponding lower-case letter (as defined by character type information in
the locale category \fB\fR\fBLC_CTYPE\fR\fB), \fR the result is the
corresponding lower-case letter. All other arguments in the domain are returned
unchanged.
.LP
The function \fBtolower_l()\fR behaves identically to \fBtolower()\fR, except
instead of operating in the current locale, it operates in the locale
specified by \fIloc\fR.
.SH RETURN VALUES
.LP
On successful completion, \fBtolower()\fR returns the lower-case letter
corresponding to the argument passed. Otherwise, it returns the argument
unchanged.
.SH ERRORS
.LP
No errors are defined.
.SH ATTRIBUTES
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.LP
\fB_tolower\fR(3C), \fBnewlocale\fR(3C), \fBsetlocale\fR(3C),
\fBuselocale\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)