Infrastructure: Split the files into subdirectories.

[mLib] / mem / arena.c

diff --git a/mem/arena.c b/mem/arena.c
new file mode 100644 (file)
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+++ b/mem/arena.c
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+/* -*-c-*-
+ *
+ * Abstraction for memory allocation arenas
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "arena.h"
+
+/*----- The standard arena ------------------------------------------------*/
+
+static void *_alloc(arena *a, size_t sz) { return malloc(sz); }
+static void *_realloc(arena *a, void *p, size_t sz, size_t osz)
+  { return realloc(p, sz); }
+static void _free(arena *a, void *p) { free(p); }
+
+static arena_ops stdlib_ops = { _alloc, _realloc, _free, 0 };
+arena arena_stdlib = { &stdlib_ops };
+
+/*----- Global variables --------------------------------------------------*/
+
+arena *arena_global = &arena_stdlib;
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @arena_fakerealloc@ --- *
+ *
+ * Arguments:  @arena *a@ = pointer to arena block
+ *             @void *p@ = pointer to memory block to resize
+ *             @size_t sz@ = size desired for the block
+ *             @size_t osz@ = size of the old block
+ *
+ * Returns:    ---
+ *
+ * Use:                Standard fake @realloc@ function, for use if you don't
+ *             support @realloc@ properly.
+ */
+
+void *arena_fakerealloc(arena *a, void *p, size_t sz, size_t osz)
+{
+  void *q = A_ALLOC(a, sz);
+  if (!q)
+    return (0);
+  memcpy(q, p, sz > osz ? osz : sz);
+  A_FREE(a, p);
+  return (q);
+}
+
+/* --- Function equivalents of the macros --- */
+
+void *a_alloc(arena *a, size_t sz) { return (A_ALLOC(a, sz)); }
+void *a_realloc(arena *a, void *p, size_t sz, size_t osz)
+{ return A_REALLOC(a, p, sz, osz); }
+void a_free(arena *a, void *p) { A_FREE(a, p); }
+
+/*----- That's all, folks -------------------------------------------------*/