kc3-lang/gnulib/doc/glibc-functions/reallocarray.texi

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• Hash : a7477abe
  Author :
  Date : 2021-04-24T10:45:45
  

  reallocarray: check for ptrdiff_t overflow
  
  * 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.
  

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• doc/glibc-functions/reallocarray.texi

• @node reallocarray
  @subsection @code{reallocarray}
  @findex reallocarray
  
  Documentation:
  @itemize
  @item
  @ifinfo
  @ref{Changing Block Size,,Changing the Size of a Block,libc},
  @end ifinfo
  @ifnotinfo
  @url{https://www.gnu.org/software/libc/manual/html_node/Changing-Block-Size.html},
  @end ifnotinfo
  @item
  @uref{https://www.kernel.org/doc/man-pages/online/pages/man3/reallocarray.3.html,,man reallocarray}.
  @end itemize
  
  Gnulib module: reallocarray
  
  Allocate multiple memory locations of a fixed size with integer overflow
  protection.
  Glibc Manual: @url{https://www.gnu.org/software/libc/manual/html_node/Changing-Block-Size.html#Changing-Block-Size}
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  This function is missing on many platforms:
  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.
  
  @item
  On some platforms, @code{reallocarray (n, s)} can succeed even if
  multiplying @code{n} by @code{s} would exceed @code{PTRDIFF_MAX},
  which can lead to undefined behavior later:
  FreeBSD 13, NetBSD 9, OpenBSD 6, musl 1.2.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @end itemize
  

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