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-rw-r--r--libc/stdlib/malloc/malloc_debug.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/libc/stdlib/malloc/malloc_debug.c b/libc/stdlib/malloc/malloc_debug.c
new file mode 100644
index 000000000..20a37f2f0
--- /dev/null
+++ b/libc/stdlib/malloc/malloc_debug.c
@@ -0,0 +1,85 @@
+/*
+ * libc/stdlib/malloc/malloc_debug.c -- malloc debugging support
+ *
+ * Copyright (C) 2002 NEC Corporation
+ * Copyright (C) 2002 Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License. See the file COPYING.LIB in the main
+ * directory of this archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+#include "malloc.h"
+#include "heap.h"
+
+#ifdef MALLOC_DEBUGGING
+int __malloc_debug = 0, __malloc_check = 0;
+#endif
+
+#ifdef MALLOC_MMB_DEBUGGING
+int __malloc_mmb_debug = 0;
+#endif
+
+/* Debugging output is indented this may levels. */
+int __malloc_debug_cur_indent = 0;
+
+
+/* Print FMT and args indented at the current debug print level, followed
+ by a newline, and change the level by INDENT. */
+void
+__malloc_debug_printf (int indent, const char *fmt, ...)
+{
+ int i;
+ va_list val;
+
+ for (i = 0; i < __malloc_debug_cur_indent; i++)
+ fputs (" ", stderr);
+
+ va_start (val, fmt);
+ vfprintf (stderr, fmt, val);
+ va_end (val);
+
+ putc ('\n', stderr);
+
+ __malloc_debug_indent (indent);
+}
+
+void
+__malloc_debug_init (void)
+{
+ char *ev = getenv ("MALLOC_DEBUG");
+ if (ev)
+ {
+ int val = atoi (ev);
+ if (val & 1)
+ __malloc_check = 1;
+
+#ifdef MALLOC_DEBUGGING
+ if (val & 2)
+ __malloc_debug = 1;
+#endif
+#ifdef MALLOC_MMB_DEBUGGING
+ if (val & 4)
+ __malloc_mmb_debug = 1;
+#endif
+
+#ifdef HEAP_DEBUGGING
+ if (val & 8)
+ __heap_debug = 1;
+#endif
+
+ if (val)
+ __malloc_debug_printf
+ (0, "malloc_debug: initialized to %d (check = %d, dump = %d, dump_mmb = %d, dump_heap = %d)",
+ val,
+ !!(val & 1), !!(val & 2),
+ !!(val & 4), !!(val & 8));
+ }
+}