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  45 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
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  47 .TH WCSCOLL 3C "April 9, 2016"
  48 .SH NAME
  49 wcscoll, wcscoll_l wscoll \- wide character string comparison using collating information
  50 .SH SYNOPSIS
  51 .LP
  52 .nf
  53 #include <wchar.h>
  54 
  55 \fBint\fR \fBwcscoll\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR);
  56 .fi
  57 .LP
  58 .nf
  59 \fBint\fR \fBwcscoll_l\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR, \fBlocale_t\fR \fIloc\fR);
  60 .fi
  61 .LP
  62 .nf
  63 \fBint\fR \fBwscoll\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR);
  64 .fi
  65 .SH DESCRIPTION
  66 .LP
  67 The \fBwcscoll()\fR, \fBwcscoll_l()\fR, and \fBwscoll()\fR functions compare
  68 the wide character
  69 string pointed to by \fIws1\fR to the wide character string pointed to by
  70 \fIws2\fR, both interpreted as appropriate to the \fBLC_COLLATE\fR locale
  71 category.
  72 .LP
  73 These  functions do not change the setting of \fBerrno\fR if successful.
  74 .LP
  75 An application wanting to check for error situations should set \fBerrno\fR to
  76 0 before calling these functions.  If \fBerrno\fR is non-zero
  77 on return, an error has occurred.
  78 .LP
  79 The function \fBwcsoll_l()\fR behaves identically to \fBwcsoll\fR(), except
  80 instead of operating in the current locale, it operates in the locale
  81 specified by \fIloc\fR.
  82 .SH RETURN VALUES
  83 .LP
  84 Upon successful completion, these functions return an
  85 integer greater than, equal to, or less than 0, depending upon whether the wide
  86 character string pointed to by \fIws1\fR is greater than, equal to, or less
  87 than the wide character string pointed to by \fIws2\fR, when both are
  88 interpreted as appropriate to the current locale, or the locale
  89 specified by \fIloc\fR. On error,
  90 they set \fBerrno\fR, but no return value is reserved to indicate an error.
  91 .SH ERRORS
  92 .LP
  93 The \fBwcscoll()\fR, \fBwcscoll_l()\fR and \fBwscoll()\fR functions may fail if:
  94 .sp
  95 .ne 2
  96 .na
  97 \fB\fBEINVAL\fR\fR
  98 .ad
  99 .RS 10n
 100 The \fIws1\fR or \fIws2\fR arguments contain wide character codes outside the
 101 domain of the collating sequence.
 102 .RE
 103 .SH USAGE
 104 .LP
 105 The \fBwcsxfrm\fR(3C) and \fBwcscmp\fR(3C) functions should be used for sorting
 106 large lists, or when performing many comparisons on the same strings.
 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 CSI     Enabled
 117 _
 118 Interface Stability     See below.
 119 _
 120 MT-Level        MT-Safe
 121 .TE
 122 
 123 .LP
 124 The \fBwcscoll()\fR and \fBwcscoll_l()\fR functions are Standard.
 125 The \fBwscoll()\fR function is Committed.
 126 .SH SEE ALSO
 127 .LP
 128 \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBuselocale\fR(3C),
 129 \fBwcscmp\fR(3C), \fBwcsxfrm\fR(3C), \fBattributes\fR(5),
 130 \fBstandards\fR(5)