1 '\" te
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  10 .TH WCRTOMB 3C "Nov 1, 2003"
  11 .SH NAME
  12 wcrtomb \- convert a wide-character code to a character (restartable)
  13 .SH SYNOPSIS
  14 .LP
  15 .nf
  16 #include <stdio.h>
  17 
  18 \fBsize_t\fR \fBwcrtomb\fR(\fBchar *restrict\fR \fIs\fR, \fBwchar_t\fR \fIwc\fR, \fBmbstate_t *restrict\fR \fIps\fR);
  19 .fi
  20 
  21 .SH DESCRIPTION
  22 .sp
  23 .LP
  24 If \fIs\fR is a null pointer, the \fBwcrtomb()\fR function is equivalent to the
  25 call:
  26 .sp
  27 .LP
  28 wcrtomb(buf, L'\e0', ps)
  29 .sp
  30 .LP
  31 where \fIbuf\fR is an internal buffer.
  32 .sp
  33 .LP
  34 If \fIs\fR is not a null pointer, the \fBwcrtomb()\fR function determines the
  35 number of bytes needed to represent the character that corresponds to the
  36 wide-character given by \fIwc\fR (including any shift sequences), and stores
  37 the resulting bytes in the array whose first element is pointed to by \fIs\fR.
  38 At most \fBMB_CUR_MAX\fR bytes are stored.  If \fIwc\fR is a null
  39 wide-character, a null byte is stored, preceded by any shift sequence needed to
  40 restore the initial shift state. The resulting state described is the initial
  41 conversion state.
  42 .sp
  43 .LP
  44 If \fIps\fR is a null pointer, the \fBwcrtomb()\fR function uses its own
  45 internal \fBmbstate_t\fR object, which is initialized at program startup to the
  46 initial conversion state.   Otherwise, the  \fBmbstate_t\fR object pointed to
  47 by \fIps\fR is used to completely describe the current conversion state of the
  48 associated character sequence. Solaris will behave as if no function defined in
  49 the Solaris Reference Manual calls \fBwcrtomb()\fR.
  50 .sp
  51 .LP
  52 The behavior of this function is affected by the \fBLC_CTYPE\fR category of the
  53 current locale.  See \fBenviron\fR(5).
  54 .SH RETURN VALUES
  55 .sp
  56 .LP
  57 The \fBwcrtomb()\fR function returns the number of bytes stored in the array
  58 object (including any shift sequences).  When \fIwc\fR is not a valid
  59 wide-character, an encoding error occurs.  In this case, the function stores
  60 the value of the macros \fBEILSEQ\fR in \fBerrno\fR and returns
  61 \fB(size_t)\(mi1\fR; the conversion state is undefined.
  62 .SH ERRORS
  63 .sp
  64 .LP
  65 The \fBwcrtomb()\fR function may fail if:
  66 .sp
  67 .ne 2
  68 .na
  69 \fB\fBEINVAL\fR\fR
  70 .ad
  71 .RS 10n
  72 The \fIps\fR argument points to an object that contains an invalid conversion
  73 state.
  74 .RE
  75 
  76 .sp
  77 .ne 2
  78 .na
  79 \fB\fBEILSEQ\fR\fR
  80 .ad
  81 .RS 10n
  82 Invalid wide-character code is detected.
  83 .RE
  84 
  85 .SH USAGE
  86 .sp
  87 .LP
  88 If \fIps\fR is not a null pointer, \fBwcrtomb()\fR uses the \fBmbstate_t\fR
  89 object pointed to by \fIps\fR and the function can be used safely in
  90 multithreaded applications, as long as \fBsetlocale\fR(3C) is not being called
  91 to change the locale. If \fIps\fR is a null pointer, \fBwcrtomb()\fR uses its
  92 internal \fBmbstate_t\fR object and the function is Unsafe in multithreaded
  93 applications.
  94 .SH ATTRIBUTES
  95 .sp
  96 .LP
  97 See \fBattributes\fR(5) for descriptions of the following attributes:
  98 .sp
  99 
 100 .sp
 101 .TS
 102 box;
 103 c | c
 104 l | l .
 105 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 106 _
 107 Interface Stability     Standard
 108 _
 109 MT-Level        See NOTES below
 110 .TE
 111 
 112 .SH SEE ALSO
 113 .sp
 114 .LP
 115 \fBmbsinit\fR(3C), \fBsetlocale\fR(3C), \fBattributes\fR(5),
 116 \fBstandards\fR(5), \fBenviron\fR(5)