/contrib/tcsh/tc.nls.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 143 lines · 97 code · 10 blank · 36 comment · 30 complexity · f67c8c23f5202bebd630f2a7fdc7dd66 MD5 · raw file
- /* $Header: /p/tcsh/cvsroot/tcsh/tc.nls.c,v 3.23 2010/02/12 22:17:20 christos Exp $ */
- /*
- * tc.nls.c: NLS handling
- */
- /*-
- * Copyright (c) 1980, 1991 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include "sh.h"
- RCSID("$tcsh: tc.nls.c,v 3.23 2010/02/12 22:17:20 christos Exp $")
- #ifdef WIDE_STRINGS
- # ifdef HAVE_WCWIDTH
- # ifdef UTF16_STRINGS
- int
- xwcwidth (wint_t wchar)
- {
- wchar_t ws[2];
- if (wchar <= 0xffff)
- return wcwidth ((wchar_t) wchar);
- /* UTF-16 systems can't handle these values directly in calls to wcwidth.
- However, they can handle them as surrogate pairs in calls to wcswidth.
- What we do here is to convert UTF-32 values >= 0x10000 into surrogate
- pairs and compute the width by calling wcswidth. */
- wchar -= 0x10000;
- ws[0] = 0xd800 | (wchar >> 10);
- ws[1] = 0xdc00 | (wchar & 0x3ff);
- return wcswidth (ws, 2);
- }
- # else
- #define xwcwidth wcwidth
- # endif /* !UTF16_STRINGS */
- # endif /* HAVE_WCWIDTH */
- int
- NLSWidth(Char c)
- {
- # ifdef HAVE_WCWIDTH
- int l;
- if (c & INVALID_BYTE)
- return 1;
- l = xwcwidth((wchar_t) c);
- return l >= 0 ? l : 0;
- # else
- return iswprint(c) != 0;
- # endif
- }
- int
- NLSStringWidth(const Char *s)
- {
- int w = 0, l;
- Char c;
- while (*s) {
- c = *s++;
- #ifdef HAVE_WCWIDTH
- if ((l = xwcwidth((wchar_t) c)) < 0)
- l = 2;
- #else
- l = iswprint(c) != 0;
- #endif
- w += l;
- }
- return w;
- }
- #endif
- Char *
- NLSChangeCase(const Char *p, int mode)
- {
- Char c, *n, c2 = 0;
- const Char *op = p;
- for (; (c = *p) != 0; p++) {
- if (mode == 0 && Islower(c)) {
- c2 = Toupper(c);
- break;
- } else if (mode && Isupper(c)) {
- c2 = Tolower(c);
- break;
- }
- }
- if (!*p)
- return 0;
- n = Strsave(op);
- n[p - op] = c2;
- return n;
- }
- int
- NLSClassify(Char c, int nocomb)
- {
- int w;
- if (c & INVALID_BYTE)
- return NLSCLASS_ILLEGAL;
- w = NLSWidth(c);
- if ((w > 0 && !(Iscntrl(c) && (c & CHAR) < 0x100)) || (Isprint(c) && !nocomb))
- return w;
- if (Iscntrl(c) && (c & CHAR) < 0x100) {
- if (c == '\n')
- return NLSCLASS_NL;
- if (c == '\t')
- return NLSCLASS_TAB;
- return NLSCLASS_CTRL;
- }
- #ifdef WIDE_STRINGS
- if (c >= 0x1000000)
- return NLSCLASS_ILLEGAL4;
- if (c >= 0x10000)
- return NLSCLASS_ILLEGAL3;
- #endif
- if (c >= 0x100)
- return NLSCLASS_ILLEGAL2;
- return NLSCLASS_ILLEGAL;
- }