contrib/tcsh-6/tc.nls.c

   1 /* $Header: /p/tcsh/cvsroot/tcsh/tc.nls.c,v 3.25 2015/05/04 15:31:13 christos Exp $ */
   2 /*
   3  * tc.nls.c: NLS handling
   4  */
   5 /*-
   6  * Copyright (c) 1980, 1991 The Regents of the University of California.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 #include "sh.h"
  34
  35 RCSID("$tcsh: tc.nls.c,v 3.25 2015/05/04 15:31:13 christos Exp $")
  36
  37
  38 #ifdef WIDE_STRINGS
  39 # ifdef HAVE_WCWIDTH
  40 #  ifdef UTF16_STRINGS
  41 int
  42 xwcwidth (wint_t wchar)
  43 {
  44   wchar_t ws[2];
  45
  46   if (wchar <= 0xffff)
  47     return wcwidth ((wchar_t) wchar);
  48   /* UTF-16 systems can't handle these values directly in calls to wcwidth.
  49      However, they can handle them as surrogate pairs in calls to wcswidth.
  50      What we do here is to convert UTF-32 values >= 0x10000 into surrogate
  51      pairs and compute the width by calling wcswidth. */
  52   wchar -= 0x10000;
  53   ws[0] = 0xd800 | (wchar >> 10);
  54   ws[1] = 0xdc00 | (wchar & 0x3ff);
  55   return wcswidth (ws, 2);
  56 }
  57 #  else
  58 #define xwcwidth wcwidth
  59 #  endif /* !UTF16_STRINGS */
  60 # endif /* HAVE_WCWIDTH */
  61
  62 int
  63 NLSWidth(Char c)
  64 {
  65 # ifdef HAVE_WCWIDTH
  66     int l;
  67     if (c & INVALID_BYTE)
  68         return 1;
  69     l = xwcwidth((wchar_t) c);
  70     return l >= 0 ? l : 0;
  71 # else
  72     return iswprint(c) != 0;
  73 # endif
  74 }
  75
  76 int
  77 NLSStringWidth(const Char *s)
  78 {
  79     int w = 0, l;
  80     Char c;
  81
  82     while (*s) {
  83         c = *s++;
  84 #ifdef HAVE_WCWIDTH
  85         if ((l = xwcwidth((wchar_t) c)) < 0)
  86                 l = 2;
  87 #else
  88         l = iswprint(c) != 0;
  89 #endif
  90         w += l;
  91     }
  92     return w;
  93 }
  94 #endif
  95
  96 Char *
  97 NLSChangeCase(const Char *p, int mode)
  98 {
  99     Char c, *n, c2 = 0;
 100     const Char *op = p;
 101
 102     for (; (c = *p) != 0; p++) {
 103         if (mode == 0 && Islower(c)) {
 104             c2 = Toupper(c);
 105             break;
 106         } else if (mode && Isupper(c)) {
 107             c2 = Tolower(c);
 108             break;
 109         }
 110     }
 111     if (!*p)
 112         return 0;
 113     n = Strsave(op);
 114     n[p - op] = c2;
 115     return n;
 116 }
 117
 118 int
 119 NLSClassify(Char c, int nocomb)
 120 {
 121     int w;
 122     if (c & INVALID_BYTE)
 123         return NLSCLASS_ILLEGAL;
 124     w = NLSWidth(c);
 125     if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
 126         return w;
 127     if (Iscntrl(c) && (c & CHAR) < 0x100) {
 128         if (c == '\n')
 129             return NLSCLASS_NL;
 130         if (c == '\t')
 131             return NLSCLASS_TAB;
 132         return NLSCLASS_CTRL;
 133     }
 134 #ifdef WIDE_STRINGS
 135     if (c >= 0x1000000)
 136         return NLSCLASS_ILLEGAL4;
 137     if (c >= 0x10000)
 138         return NLSCLASS_ILLEGAL3;
 139 #endif
 140     if (c >= 0x100)
 141         return NLSCLASS_ILLEGAL2;
 142     return NLSCLASS_ILLEGAL;
 143 }