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Bruno Haible
c36a0f21b3
* doc/Makefile (undocumented-modules.texi): New rule. (%.info, %.html, %.dvi, %.pdf): Depend on undocumented-modules.texi. (mostlyclean): Remove also *.m and *.tmp. (force): New rule. * doc/*.texi: Add module index entries. * doc/*/*.texi: Likewise.
84 lines
3.1 KiB
Plaintext
84 lines
3.1 KiB
Plaintext
@node getopt
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@subsection @code{getopt}
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@findex getopt
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/getopt.html}
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LSB specification:@* @url{https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/libutil-getopt-3.html}
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Gnulib module: getopt-posix or getopt-gnu
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@mindex getopt-posix
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@mindex getopt-gnu
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The module @code{getopt-gnu} has support for ``long options'' and for
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``options that take optional arguments''. Compared to the API defined by POSIX,
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it adds a header file @code{<getopt.h>} and a function @code{getopt_long}.
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Portability problems fixed by either Gnulib module @code{getopt-posix} or @code{getopt-gnu}:
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@itemize
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@item
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This function is missing on some platforms:
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MSVC 14.
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@item
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The value of @code{optind} after a missing required argument is wrong
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on some platforms:
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macOS 14, AIX 7.1, mingw.
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@end itemize
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Portability problems fixed by Gnulib module @code{getopt-gnu}:
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@itemize
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@item
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The function @code{getopt} does not support the @samp{+} flag in the options
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string on some platforms:
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macOS 14, AIX 5.2, HP-UX 11, Solaris 11 2010-11.
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@item
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The function @code{getopt} does not obey the combination of @samp{+}
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and @samp{:} flags in the options string on some platforms:
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glibc 2.11.
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@item
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The function @code{getopt} does not obey the @samp{-} flag in the options
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string when @env{POSIXLY_CORRECT} is set on some platforms:
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Cygwin 1.7.0.
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@item
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The function @code{getopt} does not support options with optional arguments
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on some platforms:
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macOS 14, OpenBSD 4.0, AIX 5.2, HP-UX 11, Solaris 11 2010-11, Cygwin 1.5.x.
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@item
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The function @code{getopt_long} is missing on some platforms:
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AIX 5.1, HP-UX 11, Solaris 9, MSVC 14.
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@item
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The function @code{getopt_long} does not support abbreviated long options
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where all disambiguations are equivalent on some platforms:
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OpenBSD 5.0.
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@item
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The function @code{getopt_long_only} is missing on some platforms:
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FreeBSD 5.2.1, NetBSD 10.0, AIX 5.1, HP-UX 11, Solaris 9, mingw, MSVC 14.
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@item
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This function crashes if the option string includes @code{W;} on some
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platforms:
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glibc 2.14.
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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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@item
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The default behavior of the glibc implementation of @code{getopt} allows
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mixing option and non-option arguments on the command line in any order.
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Other implementations, such as the one in Cygwin, enforce strict POSIX
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compliance: they require that the option arguments precede the non-option
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arguments. This is something to watch out in your program's
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testsuite.
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@item
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The glibc implementation allows a complete reset of the environment,
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including re-checking for @env{POSIXLY_CORRECT}, by setting
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@code{optind} to 0. Several BSD implementations provide @code{optreset},
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causing a reset by setting it non-zero, although it does not
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necessarily re-read @env{POSIXLY_CORRECT}. Solaris @code{getopt} does
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not support either reset method, but does not maintain state that
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needs the extra level of reset.
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@item
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On some platforms, this function does not set the stream error
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indicator on attempts to write to a read-only stream:
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glibc 2.13, Cygwin 1.7.9.
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@end itemize
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