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Portions of this commit are commented out because they tickle glibc bugs. For a real-life example of the bug: $ env -ua -: env: invalid option -- : Try `env --help' for more information. $ env -: env: invalid option -- : Try `env --help' for more information. $ env -+ env: invalid option -- + Try `env --help' for more information. $ env -ua -+ Try `env --help' for more information. Notice that when -+ is not given as the first argument, the error message is mistakenly suppressed. * modules/getopt-posix-tests (Depends-on): Add dup2. * tests/test-getopt.c (ASSERT): Avoid stderr. (main): Move stderr to a temporary file. * tests/test-getopt.h (getopt_loop): No longer manipulate opterr. Instead, add parameter to inform caller if output occurred. (test_getopt): Adjust all tests to expect silence, and add new tests of leading ":". * doc/glibc-functions/getopt_long.texi (getopt_long): Document glibc shortcomings with leading "-:" or "+:" in optstring. * doc/glibc-functions/getopt_long_only.texi (getopt_long_only): Likewise. * doc/posix-functions/getopt.texi (getopt): Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>
64 lines
2.4 KiB
Plaintext
64 lines
2.4 KiB
Plaintext
@node getopt
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@section @code{getopt}
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@findex getopt
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/getopt.html}
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Gnulib module: getopt-posix or 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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The @code{getopt} function keeps some internal state that cannot be explicitly
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reset on some platforms:
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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 X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10.
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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 X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1,
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Solaris 10, 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, IRIX 6.5, OSF/1 5.1, Solaris 9, Interix 3.5.
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@item
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The function @code{getopt_long_only} is missing on some platforms:
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MacOS X 10.3, FreeBSD 5.2.1, NetBSD 3.0, AIX 5.1, HP-UX 11, IRIX 6.5,
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OSF/1 5.1, Solaris 9, mingw, Interix 3.5.
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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. Other 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}.
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@item
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Mixing a leading @samp{-} or @samp{+} with a leading @samp{:} in the
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optstring argument has inconsistent effects across platforms.
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@end itemize
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