'\" te .\" Copyright 1989 AT&T Copyright (c) 1992, X/Open Company Limited All Rights Reserved Portions Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. 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. .TH mblen 3C "24 Jul 2002" "SunOS 5.11" "Standard C Library Functions" .SH NAME mblen \- get number of bytes in a character .SH SYNOPSIS .LP .nf #include \fBint\fR \fBmblen\fR(\fBconst char *\fR\fIs\fR, \fBsize_t\fR \fIn\fR); .fi .SH DESCRIPTION .sp .LP If \fIs\fR is not a null pointer, \fBmblen()\fR determines the number of bytes constituting the character pointed to by \fIs\fR. It is equivalent to: .sp .LP \fBmbtowc((wchar_t *)0, \fR\fIs\fR, \fIn\fR); .sp .LP A call with \fIs\fR as a null pointer causes this function to return \fB0\fR. The behavior of this function is affected by the \fBLC_CTYPE\fR category of the current locale. .SH RETURN VALUES .sp .LP If \fIs\fR is a null pointer, \fBmblen()\fR returns \fB0\fR. It \fIs\fR is not a null pointer, \fBmblen()\fR returns \fB0\fR (if \fIs\fR points to the null byte), the number of bytes that constitute the character (if the next \fIn\fR or fewer bytes form a valid character), or \fB\(mi1\fR (if they do not form a valid character) and may set \fBerrno\fR to indicate the error. In no case will the value returned be greater than \fIn\fR or the value of the \fBMB_CUR_MAX\fR macro. .SH ERRORS .sp .LP The \fBmblen()\fR function may fail if: .sp .ne 2 .mk .na \fB\fBEILSEQ\fR\fR .ad .RS 10n .rt Invalid character sequence is detected. .RE .SH USAGE .sp .LP The \fBmblen()\fR function can be used safely in multithreaded applications, as long as \fBsetlocale\fR(3C) is not being called to change the locale. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS tab() box; lw(2.75i) |lw(2.75i) lw(2.75i) |lw(2.75i) . \fBATTRIBUTE TYPE\fR\fBATTRIBUTE VALUE\fR _ CSIEnabled _ Interface StabilityStandard _ MT-LevelMT-Safe with exceptions .TE .SH SEE ALSO .sp .LP \fBmbstowcs\fR(3C), \fBmbtowc\fR(3C), \fBsetlocale\fR(3C), \fBwcstombs\fR(3C), \fBwctomb\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)