summaryrefslogtreecommitdiff
path: root/tests/xalloc-oversized.h
diff options
context:
space:
mode:
authorManuel A. Fernandez Montecelo <manuel.montezelo@gmail.com>2016-05-27 14:35:16 +0100
committerManuel A. Fernandez Montecelo <manuel.montezelo@gmail.com>2016-05-27 14:35:16 +0100
commit3590c846d4c2febbc05b4ad6b14a06edc549e453 (patch)
treee5d38581c2f36e1cca02efedd2d85044d77f76f9 /tests/xalloc-oversized.h
parenta9a31b1de5776a3b08a82101a4fa711294f0dd1d (diff)
Imported Upstream version 0.9.6+really0.9.6upstream/0.9.6+really0.9.6
Diffstat (limited to 'tests/xalloc-oversized.h')
-rw-r--r--tests/xalloc-oversized.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/xalloc-oversized.h b/tests/xalloc-oversized.h
new file mode 100644
index 00000000..f0e9778f
--- /dev/null
+++ b/tests/xalloc-oversized.h
@@ -0,0 +1,38 @@
+/* xalloc-oversized.h -- memory allocation size checking
+
+ Copyright (C) 1990-2000, 2003-2004, 2006-2015 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/>. */
+
+#ifndef XALLOC_OVERSIZED_H_
+# define XALLOC_OVERSIZED_H_
+
+# include <stddef.h>
+
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+ to size arithmetic overflow. S must be positive and N must be
+ nonnegative. This is a macro, not a function, so that it
+ works correctly even when SIZE_MAX < N.
+
+ By gnulib convention, SIZE_MAX represents overflow in size
+ calculations, so the conservative dividend to use here is
+ SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+ However, malloc (SIZE_MAX) fails on all known hosts where
+ sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+ exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+ branch when S is known to be 1. */
+# define xalloc_oversized(n, s) \
+ ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
+#endif /* !XALLOC_OVERSIZED_H_ */