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Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions 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. .\" This notice shall appear on any product containing this material. .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). 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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH MBRTOWC 3C "Nov 1, 2003" .SH NAME mbrtowc \- convert a character to a wide-character code (restartable) .SH SYNOPSIS .LP .nf #include \fBsize_t\fR \fBmbrtowc\fR(\fBwchar_t *restrict\fR \fIpwc\fR, \fBconst char *restrict\fR \fIs\fR, \fBsize_t\fR \fIn\fR, \fBmbstate_t *restrict\fR \fIps\fR); .fi .SH DESCRIPTION .sp .LP If \fIs\fR is a null pointer, the \fBmbrtowc()\fR function is equivalent to the call: .sp .in +2 .nf mbrtowc(NULL, ``'', 1, ps) .fi .in -2 .sp .LP In this case, the values of the arguments \fIpwc\fR and \fIn\fR are ignored. .sp .LP If \fIs\fR is not a null pointer, the \fBmbrtowc()\fR function inspects at most \fIn\fR bytes beginning at the byte pointed to by \fIs\fR to determine the number of bytes needed to complete the next character (including any shift sequences). If the function determines that the next character is completed, it determines the value of the corresponding wide-character and then, if \fIpwc\fR is not a null pointer, stores that value in the object pointed to by \fIpwc\fR. If the corresponding wide-character is the null wide-character, the resulting state described is the initial conversion state. .sp .LP If \fIps\fR is a null pointer, the \fBmbrtowc()\fR function uses its 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. Solaris will behave as if no function defined in the Solaris Reference Manual calls \fBmbrtowc()\fR. .sp .LP The behavior of this function is affected by the \fBLC_CTYPE\fR category of the current locale. See \fBenviron\fR(5). .SH RETURN VALUES .sp .LP The \fBmbrtowc()\fR function returns the first of the following that applies: .sp .ne 2 .na \fB\fB0\fR\fR .ad .RS 17n If the next \fIn\fR or fewer bytes complete the character that corresponds to the null wide-character (which is the value stored). .RE .sp .ne 2 .na \fB\fBpositive\fR\fR .ad .RS 17n If the next \fIn\fR or fewer bytes complete a valid character (which is the value stored); the value returned is the number of bytes that complete the character. .RE .sp .ne 2 .na \fB\fB(size_t)\(mi2\fR\fR .ad .RS 17n If the next \fIn\fR bytes contribute to an incomplete but potentially valid character, and all \fIn\fR bytes have been processed (no value is stored). When \fIn\fR has at least the value of the \fBMB_CUR_MAX\fR macro, this case can only occur if \fIs\fR points at a sequence of redundant shift sequences (for implementations with state-dependent encodings). .RE .sp .ne 2 .na \fB\fB(size_t)\(mi1\fR\fR .ad .RS 17n If an encoding error occurs, in which case the next \fIn\fR or fewer bytes do not contribute to a complete and valid character (no value is stored). In this case, \fBEILSEQ\fR is stored in \fBerrno\fR and the conversion state is undefined. .RE .SH ERRORS .sp .LP The \fBmbrtowc()\fR function 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 .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Standard _ MT-Level See NOTES below .TE .SH SEE ALSO .sp .LP \fBmbsinit\fR(3C), \fBsetlocale\fR(3C), \fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5) .SH NOTES .sp .LP If \fIps\fR is not a null pointer, \fBmbrtowc()\fR uses the \fBmbstate_t\fR object pointed to by \fIps\fR and the function can be used safely in multithreaded applications, as long as \fBsetlocale\fR(3C) is not being called to change the locale. If \fIps\fR is a null pointer, \fBmbrtowc()\fR uses its internal \fBmbstate_t\fR object and the function is Unsafe in multithreaded applications.