_tolower.3p (2195B)
- '\" 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
- \(em transliterate uppercase characters to lowercase
- .SH SYNOPSIS
- .LP
- .nf
- #include <ctype.h>
- .P
- int _tolower(int \fIc\fP);
- .fi
- .SH DESCRIPTION
- The
- \fI_tolower\fR()
- macro shall be equivalent to \fItolower\fP(\fIc\fP) except that the
- application shall ensure that the argument
- .IR c
- is an uppercase letter.
- .SH "RETURN VALUE"
- Upon successful completion,
- \fI_tolower\fR()
- shall return the lowercase letter corresponding to the argument
- passed.
- .SH ERRORS
- No errors are defined.
- .LP
- .IR "The following sections are informative."
- .SH EXAMPLES
- None.
- .SH "APPLICATION USAGE"
- Applications should use the
- \fItolower\fR()
- function instead of the obsolescent
- \fI_tolower\fR()
- function.
- .SH RATIONALE
- None.
- .SH "FUTURE DIRECTIONS"
- The
- \fI_tolower\fR()
- function may be removed in a future version.
- .SH "SEE ALSO"
- .IR "\fItolower\fR\^(\|)",
- .IR "\fIisupper\fR\^(\|)"
- .P
- The Base Definitions volume of POSIX.1\(hy2017,
- .IR "Chapter 7" ", " "Locale",
- .IR "\fB<ctype.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 .