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   2 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
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  11 .TH MBLEN 3C "Jun 24, 2014"
  12 .SH NAME
  13 mblen, mblen_l \- get number of bytes in a character
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 #include <stdlib.h>
  18 
  19 \fBint\fR \fBmblen\fR(\fBconst char *\fR\fIs\fR, \fBsize_t\fR \fIn\fR);
  20 .fi
  21 .LP
  22 .nf
  23 #include <stdlib.h>
  24 #include <xlocale.h>
  25 
  26 \fBint\fR \fBmblen_l\fR(\fBconst char *\fR\fIs\fR, \fBsize_t\fR \fIn\fR, \fBlocale_t\fR \fIloc\fR);
  27 .fi
  28 
  29 .SH DESCRIPTION
  30 .sp
  31 .LP
  32 If \fIs\fR is not a null pointer, \fBmblen()\fR and \fBmblen_l()\fR
  33 determine the number of bytes constituting the character pointed to by
  34 \fIs\fR. The call
  35 .IP
  36 \fBmblen(\fIs\fR, \fIn\fR)\fR;
  37 .LP
  38 is equivalent to:
  39 .IP
  40 \fBmbtowc\fR((\fBwchar_t\fR *)0, \fIs\fR, \fIn\fR);
  41 .LP
  42 A call with \fIs\fR as a null pointer causes this function to return \fB0\fR.
  43 .LP
  44 Whereas the behavior of the \fBmblen()\fR function is affected by the
  45 \fBLC_CTYPE\fR category of the current locale, the behavior of
  46 \fBmblen_l()\fR is affected by the \fBLC_CTYPE\fR category of the
  47 locale specified by \fIloc\fR.
  48 .SH RETURN VALUES
  49 .LP
  50 If \fIs\fR is a null pointer, \fBmblen()\fR and \fBmblen_l()\fR returns \fB0\fR. It \fIs\fR is not
  51 a null pointer, \fBmblen()\fR and \fBmblen_l()\fR returns \fB0\fR (if \fIs\fR points to the null
  52 byte), the number of bytes that constitute the character (if the next \fIn\fR
  53 or fewer bytes form a valid character), or  \fB\(mi1\fR (if they do not form a
  54 valid character) and may set \fBerrno\fR to indicate the error. In no case will
  55 the value returned be greater than \fIn\fR or the value of the \fBMB_CUR_MAX\fR
  56 macro.
  57 .SH ERRORS
  58 .sp
  59 .LP
  60 The \fBmblen()\fR and \fBmblen_l()\fR functions may fail if:
  61 .sp
  62 .ne 2
  63 .na
  64 \fB\fBEILSEQ\fR\fR
  65 .ad
  66 .RS 10n
  67 Invalid character sequence is detected.
  68 .RE
  69 .SH ATTRIBUTES
  70 .sp
  71 .LP
  72 See \fBattributes\fR(5) for descriptions of the following attributes:
  73 .sp
  74 
  75 .sp
  76 .TS
  77 box;
  78 c | c
  79 l | l .
  80 ATTRIBUTE TYPE  ATTRIBUTE VALUE
  81 _
  82 CSI     Enabled
  83 _
  84 Interface Stability     See below.
  85 _
  86 MT-Level        MT-Safe
  87 .TE
  88 
  89 .LP
  90 The
  91 .B mblen()
  92 function is Standard. The
  93 .B mblen_l()
  94 function is Uncommitted.
  95 .SH SEE ALSO
  96 .LP
  97 \fBmbstowcs\fR(3C), \fBmbtowc\fR(3C), \fBnewlocale\fR(3C), \fBsetlocale\fR(3C),
  98 \fBwcstombs\fR(3C), \fBwctomb\fR(3C), \fBuselocale\fR(3C) \fBattributes\fR(5),
  99 \fBstandards\fR(5)