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+'\" et
+.TH TOLOWER "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+tolower,
+tolower_l
+\(em transliterate uppercase characters to lowercase
+.SH SYNOPSIS
+.LP
+.nf
+#include <ctype.h>
+.P
+int tolower(int \fIc\fP);
+int tolower_l(int \fIc\fP, locale_t \fIlocale\fP);
+.fi
+.SH DESCRIPTION
+For
+\fItolower\fR():
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+The
+\fItolower\fR()
+and
+\fItolower_l\fR()
+functions have as a domain a type
+.BR int ,
+the value of which is representable as an
+.BR "unsigned char"
+or the value of EOF. If the argument has any other value, the behavior
+is undefined. If the argument of
+\fItolower\fR()
+or
+\fItolower_l\fR()
+represents an uppercase letter, and there exists a corresponding
+lowercase letter as defined by character type information in the current
+locale
+or in the locale represented by
+.IR locale ,
+respectively (category
+.IR LC_CTYPE ),
+the result shall be the corresponding lowercase letter. All other
+arguments in the domain are returned unchanged.
+.P
+The behavior is undefined if the
+.IR locale
+argument to
+\fItolower_l\fR()
+is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
+object handle.
+.SH "RETURN VALUE"
+Upon successful completion, the
+\fItolower\fR()
+and
+\fItolower_l\fR()
+functions shall return the lowercase letter corresponding to the
+argument passed; otherwise, they shall return the argument unchanged.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIsetlocale\fR\^(\|)",
+.IR "\fIuselocale\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Chapter 7" ", " "Locale",
+.IR "\fB<ctype.h>\fP",
+.IR "\fB<locale.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .