57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
@node isgraph
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@subsection @code{isgraph}
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@findex isgraph
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/isgraph.html}
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Gnulib module: ctype
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@mindex ctype
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function cannot be called from plain inline or extern inline functions
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on some platforms:
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macOS 10.8.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@end itemize
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Note: This function's behaviour depends on the locale, but does not support
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the multibyte characters that occur in strings in locales with
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@code{MB_CUR_MAX > 1} (this includes all the common UTF-8 locales).
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There are five alternative APIs:
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@table @code
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@item c_isgraph
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@mindex c-ctype
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This function operates in a locale independent way and returns true only for
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ASCII characters. It is provided by the Gnulib module @samp{c-ctype}.
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@item iswgraph
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@mindex wctype
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This function operates in a locale dependent way, on wide characters. In
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order to use it, you first have to convert from multibyte to wide characters,
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using the @code{mbrtowc} function. It is provided by the Gnulib module
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@samp{wctype}.
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@item c32isgraph
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@mindex c32isgraph
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This function operates in a locale dependent way, on 32-bit wide characters.
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In order to use it, you first have to convert from multibyte to 32-bit wide
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characters, using the @code{mbrtoc32} function. It is provided by the
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Gnulib module @samp{c32isgraph}.
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@item mb_isgraph
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@mindex mbchar
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This function operates in a locale dependent way, on multibyte characters.
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It is provided by the Gnulib module @samp{mbchar}.
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@item uc_is_graph
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@mindex unictype/ctype-graph
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This function operates in a locale independent way, on Unicode characters.
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It is provided by the Gnulib module @samp{unictype/ctype-graph}.
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@end table
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