man3/wcsncasecmp.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 WCSNCASECMP 3 2015-03-02 "GNU" "Linux Programmer's Manual"
  16 .SH NAME
  17 wcsncasecmp \- compare two fixed-size wide-character strings, ignoring case
  18 .SH SYNOPSIS
  19 .nf
  20 .B #include <wchar.h>
  21 .sp
  22 .BI "int wcsncasecmp(const wchar_t *" s1 ", const wchar_t *" s2 ", size_t " n );
  23 .fi
  24 .sp
  25 .in -4n
  26 Feature Test Macro Requirements for glibc (see
  27 .BR feature_test_macros (7)):
  28 .in
  29 .sp
  30 .BR wcsncasecmp ():
  31 .PD 0
  32 .ad l
  33 .RS 4
  34 .TP 4
  35 Since glibc 2.10:
  36 _XOPEN_SOURCE\ >=\ 700 || _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 wcsncasecmp ()
  46 function is the wide-character equivalent of the
  47 .BR strncasecmp (3)
  48 function.
  49 It compares the wide-character string pointed to
  50 by
  51 .I s1
  52 and the wide-character string
  53 pointed to by
  54 .IR s2 ,
  55 but at most
  56 .I n
  57 wide characters from each string, ignoring case differences
  58 .RB ( towupper (3),
  59 .BR towlower (3)).
  60 .SH RETURN VALUE
  61 The
  62 .BR wcsncasecmp ()
  63 function returns zero
  64 if the wide-character strings at
  65 .I s1
  66 and
  67 .IR s2 ,
  68 truncated to at most length
  69 .IR n ,
  70 are equal except
  71 for case distinctions.
  72 It returns a positive integer if truncated
  73 .I s1
  74 is
  75 greater than truncated
  76 .IR s2 ,
  77 ignoring case.
  78 It returns a negative integer
  79 if truncated
  80 .I s1
  81 is smaller than truncated
  82 .IR s2 ,
  83 ignoring case.
  84 .SH VERSIONS
  85 The
  86 .BR wcsncasecmp ()
  87 function is provided in glibc since version 2.1.
  88 .SH ATTRIBUTES
  89 For an explanation of the terms used in this section, see
  90 .BR attributes (7).
  91 .TS
  92 allbox;
  93 lb lb lb
  94 l l l.
  95 Interface       Attribute       Value
  96 T{
  97 .BR wcsncasecmp ()
  98 T}      Thread safety   MT-Safe locale
  99 .TE
 100 .SH CONFORMING TO
 101 POSIX.1-2008.
 102 This function is not specified in POSIX.1-2001,
 103 and is not widely available on other systems.
 104 .SH NOTES
 105 The behavior of
 106 .BR wcsncasecmp ()
 107 depends on the
 108 .B LC_CTYPE
 109 category of the
 110 current locale.
 111 .SH SEE ALSO
 112 .BR strncasecmp (3),
 113 .BR wcsncmp (3)