partially split malloc.c

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/malloc/malloc_usable_size.c b/src/malloc/malloc_usable_size.c
new file mode 100644
index 0000000..d44f11e
--- /dev/null
+++ b/src/malloc/malloc_usable_size.c
@@ -0,0 +1,40 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015, 2016  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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/>.
+ */
+#include <stdlib.h>
+#include <slibc-alloc.h>
+
+
+
+/**
+ * This function returns the allocation size of
+ * a memory segment.
+ * 
+ * `p = malloc(n), malloc_usable_size(p)` will return `n`.
+ * 
+ * @etymology  (`malloc`)-subsystem: user-(usable size) of allocation.
+ * 
+ * @param   segment  The memory segment.
+ * @return           The size of the memory segment, 0 if `segment` is `NULL`.
+ * 
+ * @since  Always.
+ */
+size_t malloc_usable_size(void* segment)
+{
+  return allocsize(segment);  
+}
+