man3/wcscasecmp.3

   1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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  10 .\" References consulted:
  11 .\"   GNU glibc-2 source code and manual
  12 .\"   Dinkumware C library reference http://www.dinkumware.com/
  13 .\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
  14 .\"
  15 .TH WCSCASECMP 3 2016-03-15 "GNU" "Linux Programmer's Manual"
  16 .SH NAME
  17 wcscasecmp \- compare two wide-character strings, ignoring case
  18 .SH SYNOPSIS
  19 .nf
  20 .B #include <wchar.h>
  21 .PP
  22 .BI "int wcscasecmp(const wchar_t *" s1 ", const wchar_t *" s2 );
  23 .fi
  24 .PP
  25 .in -4n
  26 Feature Test Macro Requirements for glibc (see
  27 .BR feature_test_macros (7)):
  28 .in
  29 .PP
  30 .BR wcscasecmp ():
  31 .PD 0
  32 .ad l
  33 .RS 4
  34 .TP 4
  35 Since glibc 2.10:
  36 _POSIX_C_SOURCE\ >=\ 200809L
  37 .TP
  38 Before glibc 2.10:
  39 _GNU_SOURCE
  40 .RE
  41 .ad
  42 .PD
  43 .SH DESCRIPTION
  44 The
  45 .BR wcscasecmp ()
  46 function is the wide-character equivalent of the
  47 .BR strcasecmp (3)
  48 function.
  49 It compares the wide-character string pointed to
  50 by
  51 .I s1
  52 and the wide-character string pointed to by
  53 .IR s2 ,
  54 ignoring
  55 case differences
  56 .RB ( towupper (3),
  57 .BR towlower (3)).
  58 .SH RETURN VALUE
  59 The
  60 .BR wcscasecmp ()
  61 function returns zero if the wide-character strings at
  62 .I s1
  63 and
  64 .I s2
  65 are equal except for case distinctions.
  66 It returns a
  67 positive integer if
  68 .I s1
  69 is greater than
  70 .IR s2 ,
  71 ignoring case.
  72 It
  73 returns a negative integer if
  74 .I s1
  75 is smaller
  76 than
  77 .IR s2 ,
  78 ignoring case.
  79 .SH VERSIONS
  80 The
  81 .BR wcscasecmp ()
  82 function is provided in glibc since version 2.1.
  83 .SH ATTRIBUTES
  84 For an explanation of the terms used in this section, see
  85 .BR attributes (7).
  86 .TS
  87 allbox;
  88 lb lb lb
  89 l l l.
  90 Interface       Attribute       Value
  91 T{
  92 .BR wcscasecmp ()
  93 T}      Thread safety   MT-Safe locale
  94 .TE
  95 .SH CONFORMING TO
  96 POSIX.1-2008.
  97 This function is not specified in POSIX.1-2001,
  98 and is not widely available on other systems.
  99 .SH NOTES
 100 The behavior of
 101 .BR wcscasecmp ()
 102 depends on the
 103 .B LC_CTYPE
 104 category of the
 105 current locale.
 106 .SH SEE ALSO
 107 .BR strcasecmp (3),
 108 .BR wcscmp (3)