From bbe35a6e1b54ef5cd7c1c471886c30ba85c0804e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 19:47:50 +0200 Subject: Adding upstream version 1.21. Signed-off-by: Daniel Baumann --- lib/xmalloc.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 133 insertions(+) create mode 100644 lib/xmalloc.c (limited to 'lib/xmalloc.c') diff --git a/lib/xmalloc.c b/lib/xmalloc.c new file mode 100644 index 0000000..69c4e7d --- /dev/null +++ b/lib/xmalloc.c @@ -0,0 +1,133 @@ +/* xmalloc.c -- malloc with out of memory checking + + Copyright (C) 1990-2000, 2002-2006, 2008-2020 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 . */ + +#include + +#define XALLOC_INLINE _GL_EXTERN_INLINE + +#include "xalloc.h" + +#include +#include + +/* 1 if calloc, malloc and realloc are known to be compatible with GNU. + This matters if we are not also using the calloc-gnu, malloc-gnu + and realloc-gnu modules, which define HAVE_CALLOC_GNU, + HAVE_MALLOC_GNU and HAVE_REALLOC_GNU and support the GNU API even + on non-GNU platforms. */ +#if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__) +enum { HAVE_GNU_CALLOC = 1 }; +#else +enum { HAVE_GNU_CALLOC = 0 }; +#endif +#if defined HAVE_MALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__) +enum { HAVE_GNU_MALLOC = 1 }; +#else +enum { HAVE_GNU_MALLOC = 0 }; +#endif +#if defined HAVE_REALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__) +enum { HAVE_GNU_REALLOC = 1 }; +#else +enum { HAVE_GNU_REALLOC = 0 }; +#endif + +/* Allocate N bytes of memory dynamically, with error checking. */ + +void * +xmalloc (size_t n) +{ + void *p = malloc (n); + if (!p && (HAVE_GNU_MALLOC || n)) + xalloc_die (); + return p; +} + +/* Change the size of an allocated block of memory P to N bytes, + with error checking. */ + +void * +xrealloc (void *p, size_t n) +{ + if (!HAVE_GNU_REALLOC && !n && p) + { + /* The GNU and C99 realloc behaviors disagree here. Act like GNU. */ + free (p); + return NULL; + } + + void *r = realloc (p, n); + if (!r && (n || (HAVE_GNU_REALLOC && !p))) + xalloc_die (); + return r; +} + +/* If P is null, allocate a block of at least *PN bytes; otherwise, + reallocate P so that it contains more than *PN bytes. *PN must be + nonzero unless P is null. Set *PN to the new block's size, and + return the pointer to the new block. *PN is never set to zero, and + the returned pointer is never null. */ + +void * +x2realloc (void *p, size_t *pn) +{ + return x2nrealloc (p, pn, 1); +} + +/* Allocate N bytes of zeroed memory dynamically, with error checking. + There's no need for xnzalloc (N, S), since it would be equivalent + to xcalloc (N, S). */ + +void * +xzalloc (size_t n) +{ + return xcalloc (n, 1); +} + +/* Allocate zeroed memory for N elements of S bytes, with error + checking. S must be nonzero. */ + +void * +xcalloc (size_t n, size_t s) +{ + void *p; + /* Test for overflow, since objects with size greater than + PTRDIFF_MAX cause pointer subtraction to go awry. Omit size-zero + tests if HAVE_GNU_CALLOC, since GNU calloc never returns NULL if + successful. */ + if (xalloc_oversized (n, s) + || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0))) + xalloc_die (); + return p; +} + +/* Clone an object P of size S, with error checking. There's no need + for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any + need for an arithmetic overflow check. */ + +void * +xmemdup (void const *p, size_t s) +{ + return memcpy (xmalloc (s), p, s); +} + +/* Clone STRING. */ + +char * +xstrdup (char const *string) +{ + return xmemdup (string, strlen (string) + 1); +} -- cgit v1.2.3