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annotate lib/wcwidth.h @ 7560:046e511d4faf

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Fix compilation error on platforms without 'wint_t' type.
author Bruno Haible <bruno@clisp.org>
date Tue, 24 Oct 2006 20:19:49 +0000
parents cae41cb69541
children ea1da95d3579
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Determine the number of screen columns needed for a character.
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2 Copyright (C) 2006 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 #ifndef _gl_WCWIDTH_H
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19 #define _gl_WCWIDTH_H
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20
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21 #if HAVE_WCHAR_T
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22
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23 /* Get wcwidth if available, along with wchar_t. */
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24 # if HAVE_WCHAR_H
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25 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
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26 <wchar.h>.
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27 BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
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28 <wchar.h>. */
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29 # include <stdio.h>
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30 # include <time.h>
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31 # include <wchar.h>
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32 # endif
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33
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34 /* Get iswprint. */
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35 # if HAVE_WCTYPE_H
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36 # include <wctype.h>
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37 # endif
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38 # if !defined iswprint && !HAVE_ISWPRINT
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39 static inline int
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40 # if HAVE_WINT_T
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41 iswprint (wint_t wc)
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42 # else
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43 iswprint (int wc)
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44 # endif
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45 {
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46 return (wc >= 0 && wc < 128
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47 ? wc >= ' ' && wc <= '~'
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48 : 1);
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49 }
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50 # define iswprint iswprint
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51 # endif
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52
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53 # ifndef HAVE_DECL_WCWIDTH
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54 "this configure-time declaration test was not run"
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55 # endif
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56 # ifndef wcwidth
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57 # if !HAVE_WCWIDTH
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58
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59 /* wcwidth doesn't exist, so assume all printable characters have
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60 width 1. */
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61 static inline int
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62 wcwidth (wchar_t wc)
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63 {
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64 return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
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65 }
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66
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67 # elif !HAVE_DECL_WCWIDTH
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68
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69 /* wcwidth exists but is not declared. */
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70 extern
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71 # ifdef __cplusplus
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72 "C"
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73 # endif
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74 int wcwidth (int /* actually wchar_t */);
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75
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76 # endif
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77 # endif
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78
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79 #endif /* HAVE_WCHAR_H */
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80
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81 #endif /* _gl_WCWIDTH_H */