1 '\" te
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  10 .TH WCSCOLL 3C "Aug 14, 2002"
  11 .SH NAME
  12 wcscoll, wcscoll_l wscoll \- wide character string comparison using collating information
  13 .SH SYNOPSIS
  14 .LP
  15 .nf
  16 #include <wchar.h>
  17 
  18 \fBint\fR \fBwcscoll\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR);
  19 \fBint\fR \fBwcscoll_l\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR, \fBlocale_t\fR \fIloc\fR);
  20 .fi
  21 
  22 .LP
  23 .nf
  24 \fBint\fR \fBwscoll\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR);
  25 .fi
  26 
  27 .SH DESCRIPTION
  28 .sp
  29 .LP
  30 The \fBwcscoll()\fR and  \fBwscoll()\fR functions compare the wide character
  31 string pointed to by \fIws1\fR to the wide character string pointed to by
  32 \fIws2\fR, both interpreted as appropriate to the \fBLC_COLLATE\fR category of
  33 the current locale.
  34 .sp
  35 .LP
  36 The \fBwcscoll()\fR and \fBwscoll()\fR functions do not change the setting of
  37 \fBerrno\fR if successful.
  38 .sp
  39 .LP
  40 An application wanting to check for error situations should set \fBerrno\fR to
  41 0 before calling \fBwcscoll()\fR or \fBwscoll()\fR.  If \fBerrno\fR is non-zero
  42 on return, an error has occurred.
  43 .sp
  44 .LP
  45 The function \fBwcsoll_l()\fR behaves identically to \fBwcsoll\fR, except
  46 instead of operating in the current environemtn, it operates in the environment
  47 specified by \fIloc\fR.
  48 .SH RETURN VALUES
  49 .sp
  50 .LP
  51 Upon successful completion, \fBwcscoll()\fR and \fBwscoll()\fR return an
  52 integer greater than, equal to, or less than 0, depending upon whether the wide
  53 character string pointed to by \fIws1\fR is greater than, equal to, or less
  54 than the wide character string pointed to by \fIws2\fR, when both are
  55 interpreted as appropriate to the current locale. On error, \fBwcscoll()\fR and
  56 \fBwscoll()\fR may set \fBerrno\fR, but no return value is reserved to indicate
  57 an error.
  58 .SH ERRORS
  59 .sp
  60 .LP
  61 The \fBwcscoll()\fR and \fBwscoll()\fR functions may fail if:
  62 .sp
  63 .ne 2
  64 .na
  65 \fB\fBEINVAL\fR\fR
  66 .ad
  67 .RS 10n
  68 The \fIws1\fR or \fIws2\fR arguments contain wide character codes outside the
  69 domain of the collating sequence.
  70 .RE
  71 
  72 .SH USAGE
  73 .sp
  74 .LP
  75 The \fBwcsxfrm\fR(3C) and \fBwcscmp\fR(3C) functions should be used for sorting
  76 large lists.
  77 .SH ATTRIBUTES
  78 .sp
  79 .LP
  80 See \fBattributes\fR(5) for descriptions of the following attributes:
  81 .sp
  82 
  83 .sp
  84 .TS
  85 box;
  86 l | l
  87 l | l .
  88 ATTRIBUTE TYPE  ATTRIBUTE VALUE
  89 _
  90 CSI     Enabled
  91 _
  92 Interface Stability     \fBwcscoll()\fR is Standard
  93 _
  94 MT-Level        MT-Safe with exceptions
  95 .TE
  96 
  97 .sp
  98 .LP
  99 The \fBwcscoll()\fR and \fBwscoll()\fR functions can be used safely in
 100 multithreaded applications as long as \fBsetlocale\fR(3C) is not being called
 101 to change the locale.
 102 .SH SEE ALSO
 103 .sp
 104 .LP
 105 \fBsetlocale\fR(3C), \fBwcscmp\fR(3C), \fBwcsxfrm\fR(3C), \fBattributes\fR(5),
 106 \fBstandards\fR(5)