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d884e6fc4a
* lib/realloc.c (rpl_realloc): Simplify and tune by using HAVE_REALLOC_0_NONNULL and HAVE_MALLOC_PTRDIFF, and by having just one call to realloc instead of two. * lib/reallocarray.c (reallocarray): Simplify and tune by delegating the zero case to the revised realloc. * m4/eealloc.m4 (_AC_FUNC_REALLOC_IF): Since only eealloc uses this macro now, move its definition here ... * m4/realloc.m4: ... from here. (gl_FUNC_REALLOC_0_NONNULL): Also check that realloc (p, 0) returns nonnull. Require gl_FUNC_REALLOC_POSIX. Define HAVE_REALLOC_0_NONNULL. * m4/reallocarray.m4 (gl_FUNC_REALLOCARRAY): Also replace reallocarray if it returns a null pointer for size zero. * modules/eealloc (Files): Remove m4/realloc.m4. * modules/realloc-posix (Depends-on): Add extensions-aix. * modules/reallocarray (Files): Add m4/realloc.m4.
45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
@node reallocarray
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@subsection @code{reallocarray}
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@findex reallocarray
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/reallocarray.html}
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Documentation:
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@itemize
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@item
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@ifinfo
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@ref{Changing Block Size,,Changing the Size of a Block,libc},
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@end ifinfo
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@ifnotinfo
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@url{https://www.gnu.org/software/libc/manual/html_node/Changing-Block-Size.html},
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@end ifnotinfo
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@item
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@uref{https://www.kernel.org/doc/man-pages/online/pages/man3/reallocarray.3.html,,man reallocarray}.
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@end itemize
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Gnulib module: reallocarray
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@mindex reallocarray
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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 is missing on many platforms:
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glibc 2.25, macOS 14, FreeBSD 10, NetBSD 7, OpenBSD 5.5, Minix 3.3.0, AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 1.7.x, mingw, MSVC 14, Android 9.0.
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@item
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On some platforms, @code{reallocarray (p, n, s)} can succeed even if
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multiplying @code{n} by @code{s} would exceed @code{PTRDIFF_MAX},
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which can lead to undefined behavior later:
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FreeBSD 13, NetBSD 9, OpenBSD 6, musl 1.2.
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@item
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It is not portable to call
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@code{reallocarray (p, n, s)} when either @code{n} or @code{s} is zero,
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as @code{reallocarray} has the same issues with zero sizes
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that @code{realloc} does. @xref{realloc}.
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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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