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author Karl Berry <karl@freefriends.org>
date Mon, 24 Aug 2015 06:09:19 -0700
parents fc6f79af802f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
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1 @node isblank
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2 @section @code{isblank}
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3 @findex isblank
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4
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5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/isblank.html}
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6
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7 Gnulib module: isblank
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8
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9 Portability problems fixed by Gnulib:
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10 @itemize
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11 @item
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12 This function is missing on some platforms:
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13 AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw, MSVC 9.
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14 @item
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15 This function cannot be called from plain inline or extern inline functions
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16 on some platforms:
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17 OS X 10.8.
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18 @end itemize
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19
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20 Portability problems not fixed by Gnulib:
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21 @itemize
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22 @end itemize
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23
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24 Note: This function's behaviour depends on the locale, but does not support
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25 the multibyte characters that occur in strings in locales with
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26 @code{MB_CUR_MAX > 1} (this includes all the common UTF-8 locales).
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27 There are four alternative APIs:
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28
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29 @table @code
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30 @item c_isblank
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31 This function operates in a locale independent way and returns true only for
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32 ASCII characters. It is provided by the Gnulib module @samp{c-ctype}.
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33
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34 @item iswblank
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35 This function operates in a locale dependent way, on wide characters. In
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36 order to use it, you first have to convert from multibyte to wide characters,
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37 using the @code{mbrtowc} function. It is provided by the Gnulib module
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38 @samp{wctype}.
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39
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40 @item mb_isblank
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41 This function operates in a locale dependent way, on multibyte characters.
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42 It is provided by the Gnulib module @samp{mbchar}.
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43
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44 @item uc_is_blank
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45 This function operates in a locale independent way, on Unicode characters.
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46 It is provided by the Gnulib module @samp{unictype/ctype-blank}.
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47 @end table