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+'\" et
+.TH MBSRTOWCS "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
+mbsnrtowcs, mbsrtowcs
+\(em convert a character string to a wide-character string (restartable)
+.SH SYNOPSIS
+.LP
+.nf
+#include <wchar.h>
+.P
+size_t mbsnrtowcs(wchar_t *restrict \fIdst\fP, const char **restrict \fIsrc\fP,
+    size_t \fInmc\fP, size_t \fIlen\fP, mbstate_t *restrict \fIps\fP);
+size_t mbsrtowcs(wchar_t *restrict \fIdst\fP, const char **restrict \fIsrc\fP,
+    size_t \fIlen\fP, mbstate_t *restrict \fIps\fP);
+.fi
+.SH DESCRIPTION
+For
+\fImbsrtowcs\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
+\fImbsrtowcs\fR()
+function shall convert a sequence of characters, beginning in the
+conversion state described by the object pointed to by
+.IR ps ,
+from the array indirectly pointed to by
+.IR src
+into a sequence of corresponding wide characters. If
+.IR dst
+is not a null pointer, the converted characters shall be stored into
+the array pointed to by
+.IR dst .
+Conversion continues up to and including a terminating null character,
+which shall also be stored. Conversion shall stop early in either of
+the following cases:
+.IP " *" 4
+A sequence of bytes is encountered that does not form a valid character.
+.IP " *" 4
+.IR len
+codes have been stored into the array pointed to by
+.IR dst
+(and
+.IR dst
+is not a null pointer).
+.P
+Each conversion shall take place as if by a call to the
+\fImbrtowc\fR()
+function.
+.P
+If
+.IR dst
+is not a null pointer, the pointer object pointed to by
+.IR src
+shall be assigned either a null pointer (if conversion stopped due to
+reaching a terminating null character) or the address just past the
+last character converted (if any). If conversion stopped due to
+reaching a terminating null character, and if
+.IR dst
+is not a null pointer, the resulting state described shall be the
+initial conversion state.
+.P
+If
+.IR ps
+is a null pointer, the
+\fImbsrtowcs\fR()
+function shall use its own internal
+.BR mbstate_t
+object, which is initialized at program start-up to the initial
+conversion state. Otherwise, the
+.BR mbstate_t
+object pointed to by
+.IR ps
+shall be used to completely describe the current conversion state of
+the associated character sequence.
+.P
+The
+\fImbsnrtowcs\fR()
+function shall be equivalent to the
+\fImbsrtowcs\fR()
+function, except that the conversion of characters indirectly
+pointed to by
+.IR src
+is limited to at most
+.IR nmc
+bytes (the size of the input buffer), and under conditions where
+\fImbsrtowcs\fR()
+would assign the address just past the last character converted (if any)
+to the pointer object pointed to by
+.IR src ,
+\fImbsnrtowcs\fR()
+shall instead assign the address just past the last byte processed
+(if any) to that pointer object. If the input buffer ends with an
+incomplete character, it is unspecified whether conversion stops at
+the end of the previous character (if any), or at the end of the input
+buffer. In the latter case, a subsequent call to
+\fImbsnrtowcs\fR()
+with an input buffer that starts with the remainder of the incomplete
+character shall correctly complete the conversion of that character.
+.P
+The behavior of these functions shall be affected by the
+.IR LC_CTYPE
+category of the current locale.
+.P
+The implementation shall behave as if no function defined in this volume of POSIX.1\(hy2017
+calls these functions.
+.P
+The
+\fImbsnrtowcs\fR()
+and
+\fImbsrtowcs\fR()
+functions need not be thread-safe if called with a NULL
+.IR ps
+argument.
+.P
+The
+\fImbsrtowcs\fR()
+function shall not change the setting of
+.IR errno
+if successful.
+.SH "RETURN VALUE"
+If the input conversion encounters a sequence of bytes that do not form
+a valid character, an encoding error occurs. In this case, these
+functions shall store the value of the macro
+.BR [EILSEQ] 
+in
+.IR errno
+and shall return (\fBsize_t\fP)\-1; the conversion state is undefined.
+Otherwise, these functions shall return the number of characters
+successfully converted, not including the terminating null (if any).
+.SH ERRORS
+These functions shall fail if:
+.TP
+.BR EILSEQ
+An invalid character sequence is detected.
+In the POSIX locale an
+.BR [EILSEQ] 
+error cannot occur since all byte values are valid characters.
+.P
+These functions may fail if:
+.TP
+.BR EINVAL
+.IR ps
+points to an object that contains an invalid conversion state.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+A future version may require that when the input buffer ends with
+an incomplete character, conversion stops at the end of the input buffer.
+.SH "SEE ALSO"
+.IR "\fIiconv\fR\^(\|)",
+.IR "\fImbrtowc\fR\^(\|)",
+.IR "\fImbsinit\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<wchar.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 .