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  10 .TH WCSRTOMBS 3C "Jun 25, 2014"
  11 .SH NAME
  12 wcsrtombs, wcsrtombs_l \- convert a wide-character string to a character string
  13 (restartable)
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 #include <wchar.h>
  18 
  19 \fBsize_t\fR \fBwcsrtombs\fR(\fBchar *restrict\fR \fIdst\fR,
  20      \fBconst wchar_t **restrict\fR \fIsrc\fR, \fBsize_t\fR \fIlen\fR,
  21      \fBmbstate_t *restrict\fR \fIps\fR);
  22 .fi
  23 .LP
  24 .nf
  25 #include <wchar.h>
  26 #include <xlocale.h>
  27 
  28 \fBsize_t\fR \fBwcsrtombs_l\fR(\fBchar *restrict\fR \fIdst\fR,
  29      \fBconst wchar_t **restrict\fR \fIsrc\fR, \fBsize_t\fR \fIlen\fR,
  30      \fBmbstate_t *restrict\fR \fIps\fR, \fBlocale_t\fR \fIloc\fR);
  31 .fi
  32 .SH DESCRIPTION
  33 .LP
  34 The \fBwcsrtombs()\fR function converts a sequence of wide-characters from the
  35 array indirectly pointed to by \fIsrc\fR into a sequence of corresponding
  36 characters, beginning in the conversion state described by the object pointed
  37 to by \fIps\fR. If \fIdst\fR is not a null pointer, the converted characters
  38 are then stored into the array pointed to by \fIdst\fR. Conversion continues up
  39 to and including a terminating null  wide-character, which is also stored.
  40 Conversion stops earlier in the following cases:
  41 .RS +4
  42 .TP
  43 .ie t \(bu
  44 .el o
  45 When a code is reached that does not correspond to a valid character.
  46 .RE
  47 .RS +4
  48 .TP
  49 .ie t \(bu
  50 .el o
  51 When the next character would exceed the limit of \fIlen\fR total bytes to be
  52 stored in the array pointed to by \fIdst\fR (and \fIdst\fR is not a null
  53 pointer).
  54 .RE
  55 .LP
  56 Each conversion takes place as if by a call to the \fBwcrtomb()\fR function.
  57 .LP
  58 If \fIdst\fR is not a null pointer, the pointer object pointed to by \fIsrc\fR
  59 is assigned either a null pointer (if conversion stopped due to reaching a
  60 terminating null wide-character) or the address just  past the last
  61 wide-character converted (if any). If conversion stopped due to reaching a
  62 terminating null wide-character, the resulting state described is the initial
  63 conversion state.
  64 .LP
  65 If \fIps\fR is a null pointer, the \fBwcsrtombs()\fR function uses its own
  66 internal \fBmbstate_t\fR object, which is initialized at program startup to the
  67 initial conversion state.  Otherwise, the  \fBmbstate_t\fR object pointed to by
  68 \fIps\fR is used to completely describe the current conversion state of the
  69 associated character sequence. The system will behave as if no function defined
  70 in the Reference Manual calls any of these functions.
  71 .LP
  72 The behavior of \fBwcsrtombs()\fR is affected by the \fBLC_CTYPE\fR category of
  73 the current locale.  See \fBenviron\fR(5).
  74 .LP
  75 The function \fBwcsrtombs_l()\fR behaves identically to \fBwcsrtombs\fR, except
  76 instead of operating in the current locale, it operates in the locale
  77 specified by \fIloc\fR.
  78 .SH RETURN VALUES
  79 .LP
  80 If conversion stops because a code is reached that does not correspond to a
  81 valid character, an encoding error occurs.  In this case, these
  82 functions store the value of the macro \fBEILSEQ\fR in \fBerrno\fR and return
  83 \fB(size_t)\(mi1\fR; the conversion state is undefined.  Otherwise, they return
  84 the number of bytes in the resulting character sequence, not including the
  85 terminating null (if any).
  86 .SH ERRORS
  87 .LP
  88 The \fBwcsrtombs()\fR and \fBwcsrtombs_l()\fR functions may fail if:
  89 .sp
  90 .ne 2
  91 .na
  92 \fB\fBEINVAL\fR\fR
  93 .ad
  94 .RS 10n
  95 The \fIps\fR argument points to an object that contains an invalid conversion
  96 state.
  97 .RE
  98 
  99 .sp
 100 .ne 2
 101 .na
 102 \fB\fBEILSEQ\fR\fR
 103 .ad
 104 .RS 10n
 105 A wide-character code does not correspond to a valid character.
 106 .RE
 107 .SH ATTRIBUTES
 108 .LP
 109 See \fBattributes\fR(5) for descriptions of the following attributes:
 110 .TS
 111 box;
 112 c | c
 113 l | l .
 114 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 115 _
 116 Interface Stability     See below.
 117 _
 118 MT-Level        See below.
 119 .TE
 120 
 121 .LP
 122 The \fBwcsrtombs()\fR function is Standard.  The \fBwcsrtombs_l()\fR
 123 function is Uncommitted.
 124 .LP
 125 If \fIps\fR is a null pointer, these functions should be considered Unsafe
 126 for use in multithreaded applications.  Otherwise, they are MT-Safe.
 127 .SH SEE ALSO
 128 .LP
 129 \fBmbsinit\fR(3C), \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBuselocale\fR(3C),
 130 \fBwcrtomb\fR(3C), \fBattributes\fR(5),
 131 \fBenviron\fR(5), \fBstandards\fR(5)