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All Rights Reserved. .\" Portions Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved. .\" Copyright 2014 Garrett D'Amore .\" .TH MBSRTOWCS 3C "December 28, 2020" .SH NAME mbsnrtowcs, mbsnrtowcs_l, mbsrtowcs, mbsrtowcs_l \- convert a character string to a wide-character string (restartable) .SH SYNOPSIS .nf #include \fBsize_t\fR \fBmbsnrtowcs\fR(\fBwchar_t *restrict\fR \fIdst\fR, \fBconst char **restrict\fR \fIsrc\fR, \fBsize_t\fR \fInms\fR, \fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR); .fi .LP .nf \fBsize_t\fR \fBmbsrtowcs\fR(\fBwchar_t *restrict\fR \fIdst\fR, \fBconst char **restrict\fR \fIsrc\fR, \fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR); .fi .LP .nf #include #include \fBsize_t\fR \fBmbsnrtowcs_l\fR(\fBwchar_t *restrict\fR \fIdst\fR, \fBconst char **restrict\fR \fIsrc\fR, \fBsize_t\fR \fInms\fR, \fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR, \fBlocale_t\fR \fIloc\fR); .fi .LP .nf \fBsize_t\fR \fBmbsrtowcs_l\fR(\fBwchar_t *restrict\fR \fIdst\fR, \fBconst char **restrict\fR \fIsrc\fR, \fBsize_t\fR \fIlen\fR, \fBmbstate_t *restrict\fR \fIps\fR, \fBlocale_t\fR \fIloc\fR); .fi .SH DESCRIPTION These function converts a sequence of characters, beginning in the conversion state described by the object pointed to by \fIps\fR, from the array indirectly pointed to by \fIsrc\fR into a sequence of corresponding wide-characters. If \fIdst\fR is not a null pointer, the converted characters are stored into the array pointed to by \fIdst\fR. Conversion continues up to and including a terminating null character, which is also stored. Conversion stops early in either of the following cases: .RS +4 .TP .ie t \(bu .el o When a sequence of bytes is encountered that does not form a valid character. .RE .RS +4 .TP .ie t \(bu .el o When \fIlen\fR codes have been stored into the array pointed to by \fIdst\fR (and \fIdst\fR is not a null pointer). .RE .LP Each conversion takes place as if by a call to the \fBmbrtowc()\fR function. .LP If \fIdst\fR is not a null pointer, the pointer object pointed to by \fIsrc\fR is 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 \fIdst\fR is not a null pointer, the resulting state described is the initial conversion state. .LP If \fIps\fR is a null pointer, these functions uses their own internal \fBmbstate_t\fR object, which is initialized at program startup to the initial conversion state. Otherwise, the \fBmbstate_t\fR object pointed to by \fIps\fR is used to completely describe the current conversion state of the associated character sequence. The system will behave as if no function defined in the Reference Manual calls any of these functions. .LP The function \fBmbsnrtowcs()\fR behaves identically to \fBmbsrtowcs()\fR, except the conversion stops after reading \fInms\fR bytes from the buffer pointed to by \fIsrc\fR. .LP The behavior of \fBmbnrtowcs()\fR and \fBmbsrtowcs()\fR functions are affected by the \fBLC_CTYPE\fR category of the current locale. See \fBenviron\fR(7). The functions \fBmbsrtowcs_l()\fR and \fBmbsnrtowcs_l()\fR behave identically to \fBmbsrtowcs()\fR and \fBmbsnrtowcs()\fR, except that instead of using the current locale, they use the locale specified by \fIloc\fR. .SH RETURN VALUES 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 store the value of the macro \fBEILSEQ\fR in \fBerrno\fR and return \fB(size_t)\(mi1\fR; the conversion state is undefined. Otherwise, they return the number of characters successfully converted, not including the terminating null (if any). .SH ERRORS These functions may fail if: .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 10n The \fIps\fR argument points to an object that contains an invalid conversion state. .RE .sp .ne 2 .na \fB\fBEILSEQ\fR\fR .ad .RS 10n Invalid character sequence is detected. .RE .SH ATTRIBUTES See \fBattributes\fR(7) for descriptions of the following attributes: .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability See below. _ MT-Level See below. .TE .LP The .B mbsnrtowcs() and .B mbsrtowcs() functions are Standard. The .B mbsnrtowcs_l() and .B mbsrtowcs_l() functions are Uncommitted. .LP If \fIps\fR is not a null pointer, these functions use the \fBmbstate_t\fR object pointed to by \fIps\fR and can be used safely in multithreaded applications, otherwise they use an internal \fBmbstate_t\fR object and are Unsafe in multithreaded applications. .SH SEE ALSO \fBmbrtowc\fR(3C), \fBmbsinit\fR(3C), \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBuselocale()\fR, \fBattributes\fR(7), .BR environ (7), .BR standards (7)