add alloca.h

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/include/alloca.h b/include/alloca.h
new file mode 100644
index 0000000..fe70c36
--- /dev/null
+++ b/include/alloca.h
@@ -0,0 +1,51 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  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/>.
+ */
+#ifndef _ALLOCA_H
+#define _ALLOCA_H
+#include <slibc/version.h>
+
+
+
+#define __NEED_size_t
+#include <bits/types.h>
+
+
+/* alloca is machine- _and_  compiler-dependent, it is not
+ * implemented in slibc, but in the compiler. */
+
+
+/**
+ * Allocation memory in the stack frame of the caller.
+ * 
+ * Undefined behaviour is invoked if the memory
+ * cannot be allocated.
+ * 
+ * @param   size  The number of bytes to allocate.
+ * @return        Pointer to the beginning of the allocated
+ *                space. Do not free it, it will be freed
+ *                automatically when the function returns.
+ */
+void* alloca(size_t size);
+#if defined(__GNUC__)
+# define alloca(size)  __builtin_alloca(size)
+#endif
+
+
+
+#endif
+