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Diffstat (limited to 'grub-core/gnulib/realloc.c')
-rw-r--r-- | grub-core/gnulib/realloc.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/grub-core/gnulib/realloc.c b/grub-core/gnulib/realloc.c new file mode 100644 index 0000000..053208f --- /dev/null +++ b/grub-core/gnulib/realloc.c @@ -0,0 +1,91 @@ +/* realloc() function that is glibc compatible. + + Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2010 Free Software + Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* written by Jim Meyering and Bruno Haible */ + +#include <config.h> + +/* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */ +#ifdef realloc +# define NEED_REALLOC_GNU 1 +/* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU. */ +#elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU +# define NEED_REALLOC_GNU 1 +#endif + +/* Infer the properties of the system's malloc function. + The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU. */ +#if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU +# define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1 +#endif + +/* Below we want to call the system's malloc and realloc. + Undefine the symbols here so that including <stdlib.h> provides a + declaration of malloc(), not of rpl_malloc(), and likewise for realloc. */ +#undef malloc +#undef realloc + +/* Specification. */ +#include <stdlib.h> + +#include <errno.h> + +/* Below we want to call the system's malloc and realloc. + Undefine the symbols, if they were defined by gnulib's <stdlib.h> + replacement. */ +#undef malloc +#undef realloc + +/* Change the size of an allocated block of memory P to N bytes, + with error checking. If N is zero, change it to 1. If P is NULL, + use malloc. */ + +void * +rpl_realloc (void *p, size_t n) +{ + void *result; + +#if NEED_REALLOC_GNU + if (n == 0) + { + n = 1; + + /* In theory realloc might fail, so don't rely on it to free. */ + free (p); + p = NULL; + } +#endif + + if (p == NULL) + { +#if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE + if (n == 0) + n = 1; +#endif + result = malloc (n); + } + else + result = realloc (p, n); + +#if !HAVE_REALLOC_POSIX + if (result == NULL) + errno = ENOMEM; +#endif + + return result; +} |