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a7477abe29
* doc/glibc-functions/reallocarray.texi (reallocarray): Mention ptrdiff_t overflow. * lib/reallocarray.c (reallocarray): Reindent as per usual GNU. * lib/stdlib.in.h (reallocarray): Allow reallocarray to be replaced. * m4/reallocarray.m4 (gl_FUNC_REALLOCARRAY): Check for ptrdiff_t overflow. * m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Set up REPLACE_REALLOCARRAY. * modules/reallocarray (Files): Add malloc.m4. (configure.ac): Also test REPLACE_REALLOCARRAY. * modules/reallocarray-tests (Depends-on): Add stdint. * modules/stdlib (stdlib.h): Substitute REPLACE_REALLOCARRAY. * tests/test-reallocarray.c: Include stdint.h. (main): Check for ptrdiff_t overflow.
40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
@node reallocarray
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@subsection @code{reallocarray}
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@findex reallocarray
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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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Allocate multiple memory locations of a fixed size with integer overflow
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protection.
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Glibc Manual: @url{https://www.gnu.org/software/libc/manual/html_node/Changing-Block-Size.html#Changing-Block-Size}
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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 11.1, FreeBSD 10, NetBSD 7, OpenBSD 5.5, Minix 3.3.0, AIX 7.2, HP-UX 11, IRIX, 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 (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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@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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