X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fmbswidth.c;h=0f380a9dcc378fa06e17656a692ce9d9c868e445;hb=298d8b4a29e66da0b046b64b822f97d1c8fef74b;hp=208a629d34f1fe93c0ee55c0211466f3ea5eebad;hpb=db5283c74954c09ce38522191517e8fef4c57a3c;p=gnulib.git

diff --git a/lib/mbswidth.c b/lib/mbswidth.c
index 208a629d3..0f380a9dc 100644
--- a/lib/mbswidth.c
+++ b/lib/mbswidth.c
@@ -1,10 +1,10 @@
 /* Determine the number of screen columns needed for a string.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright (C) 2000-2008 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,76 +12,35 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible <haible@clisp.cons.org>.  */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
-/* Get MB_LEN_MAX.  */
-#if HAVE_LIMITS_H
-# include <limits.h>
-#endif
+/* Specification.  */
+#include "mbswidth.h"
 
 /* Get MB_CUR_MAX.  */
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+#include <stdlib.h>
 
-#if HAVE_STRING_H
-# include <string.h>
-#endif
+#include <string.h>
 
 /* Get isprint().  */
 #include <ctype.h>
 
 /* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth().  */
-#if HAVE_WCHAR_H
-# include <wchar.h>
-#endif
-
-/* Get iswprint().  */
-#if HAVE_WCTYPE_H
-# include <wctype.h>
-#endif
-#if !defined iswprint && !HAVE_ISWPRINT
-# define iswprint(wc) 1
-#endif
-
-#ifndef HAVE_DECL_WCWIDTH
-"this configure-time declaration test was not run"
-#endif
-#if !HAVE_DECL_WCWIDTH
-int wcwidth ();
-#endif
-
-#ifndef wcwidth
-# if !HAVE_WCWIDTH
-/* wcwidth doesn't exist, so assume all printable characters have
-   width 1.  */
-#  define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
-# endif
-#endif
-
-/* Get ISPRINT.  */
-#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
-# define IN_CTYPE_DOMAIN(c) 1
-#else
-# define IN_CTYPE_DOMAIN(c) isascii(c)
-#endif
-/* Undefine to protect against the definition in wctype.h of solaris2.6.   */
-#undef ISPRINT
-#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
+#include <wchar.h>
 
-#include "mbswidth.h"
+/* Get iswcntrl().  */
+#include <wctype.h>
 
 /* Returns the number of columns needed to represent the multibyte
    character string pointed to by STRING.  If a non-printable character
-   occurs, -1 is returned, unless MBSW_ACCEPT_UNPRINTABLE is specified.
-   With flags = 0, this is the multibyte analogon of the wcswidth function.  */
+   occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.
+   With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is
+   the multibyte analogue of the wcswidth function.
+   If STRING is not of length < INT_MAX / 2, integer overflow can occur.  */
 int
 mbswidth (const char *string, int flags)
 {
@@ -90,8 +49,9 @@ mbswidth (const char *string, int flags)
 
 /* Returns the number of columns needed to represent the multibyte
    character string pointed to by STRING of length NBYTES.  If a
-   non-printable character occurs, -1 is returned, unless
-   MBSW_ACCEPT_UNPRINTABLE is specified.  */
+   non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is
+   specified, -1 is returned.
+   If NBYTES is not < INT_MAX / 2, integer overflow can occur.  */
 int
 mbsnwidth (const char *string, size_t nbytes, int flags)
 {
@@ -100,7 +60,6 @@ mbsnwidth (const char *string, size_t nbytes, int flags)
   int width;
 
   width = 0;
-#if HAVE_MBRTOWC && (MB_LEN_MAX > 1)
   if (MB_CUR_MAX > 1)
     {
       while (p < plimit)
@@ -146,7 +105,7 @@ mbsnwidth (const char *string, size_t nbytes, int flags)
 		    if (bytes == (size_t) -1)
 		      /* An invalid multibyte sequence was encountered.  */
 		      {
-			if (flags & MBSW_ACCEPT_INVALID)
+			if (!(flags & MBSW_REJECT_INVALID))
 			  {
 			    p++;
 			    width++;
@@ -159,7 +118,7 @@ mbsnwidth (const char *string, size_t nbytes, int flags)
 		    if (bytes == (size_t) -2)
 		      /* An incomplete multibyte character at the end.  */
 		      {
-			if (flags & MBSW_ACCEPT_INVALID)
+			if (!(flags & MBSW_REJECT_INVALID))
 			  {
 			    p = plimit;
 			    width++;
@@ -179,8 +138,8 @@ mbsnwidth (const char *string, size_t nbytes, int flags)
 		      width += w;
 		    else
 		      /* An unprintable multibyte character.  */
-		      if (flags & MBSW_ACCEPT_UNPRINTABLE)
-			width += 1;
+		      if (!(flags & MBSW_REJECT_UNPRINTABLE))
+			width += (iswcntrl (wc) ? 0 : 1);
 		      else
 			return -1;
 
@@ -192,14 +151,15 @@ mbsnwidth (const char *string, size_t nbytes, int flags)
 	  }
       return width;
     }
-#endif
 
   while (p < plimit)
     {
       unsigned char c = (unsigned char) *p++;
 
-      if ((flags & MBSW_ACCEPT_UNPRINTABLE) || ISPRINT (c))
+      if (isprint (c))
 	width++;
+      else if (!(flags & MBSW_REJECT_UNPRINTABLE))
+	width += (iscntrl (c) ? 0 : 1);
       else
 	return -1;
     }