pmt: initial 3.0.2 update

include/libgnulib/eealloc.h

@@ -0,0 +1,110 @@
+/* Memory allocation with expensive empty allocations.
+   Copyright (C) 2003, 2008, 2010-2024 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2003,
+   based on prior work by Jim Meyering.
+
+   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 <https://www.gnu.org/licenses/>.  */
+
+#ifndef _EEALLOC_H
+#define _EEALLOC_H
+
+/* malloc() and realloc() are allowed to return NULL when asked to allocate
+   a memory block of 0 bytes; this is not an out-of-memory condition.
+   (See ISO C 99 section 7.20.3.)  In some places, this is not welcome,
+   because it requires extra checking (so as not to confuse a zero-sized
+   allocation with an out-of-memory condition).  This file provides
+   malloc()/realloc() workalikes which return non-NULL pointers for
+   succeeding zero-sized allocations.  GNU libc already defines malloc()
+   and realloc() this way; on such platforms the workalikes are aliased
+   to the original malloc()/realloc() functions.  */
+
+/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _GL_ATTRIBUTE_ALLOC_SIZE,
+   _GL_ATTRIBUTE_MALLOC.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
+#include <stdlib.h>
+#if defined __CHERI_PURE_CAPABILITY__
+# include <cheri.h>
+#endif
+
+_GL_INLINE_HEADER_BEGIN
+#ifndef EEALLOC_INLINE
+# define EEALLOC_INLINE _GL_INLINE
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#if MALLOC_0_IS_NONNULL
+# define eemalloc malloc
+#else
+EEALLOC_INLINE void *eemalloc (size_t n)
+     _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1))
+     _GL_ATTRIBUTE_DEALLOC_FREE;
+EEALLOC_INLINE void *
+eemalloc (size_t n)
+{
+  /* If n is zero, allocate a 1-byte block.  */
+  size_t nx = n;
+  if (n == 0)
+    nx = 1;
+  void *ptr = malloc (nx);
+# if defined __CHERI_PURE_CAPABILITY__
+  if (ptr != NULL)
+    ptr = cheri_bounds_set (ptr, n);
+# endif
+  return ptr;
+}
+#endif
+
+#if REALLOC_0_IS_NONNULL
+# define eerealloc realloc
+#else
+EEALLOC_INLINE void *eerealloc (void *p, size_t n)
+     _GL_ATTRIBUTE_ALLOC_SIZE ((2));
+EEALLOC_INLINE void *
+eerealloc (void *p, size_t n)
+{
+  /* If n is zero, allocate or keep a 1-byte block.  */
+  size_t nx = n;
+  if (n == 0)
+    nx = 1;
+  void *ptr = realloc (p, nx);
+# if defined __CHERI_PURE_CAPABILITY__
+  if (ptr != NULL)
+    ptr = cheri_bounds_set (ptr, n);
+# endif
+  return ptr;
+}
+#endif
+
+/* Maybe we should also define variants
+    eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s)
+    eezalloc (size_t n) - like eemalloc followed by memset 0
+    eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0
+    eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s)
+   If this would be useful in your application. please speak up.  */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+_GL_INLINE_HEADER_END
+
+#endif /* _EEALLOC_H */