add utils.c, containing a calloc-like function to allocate multiple chunks with different sizes in one block and return pointers

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/utils.h b/utils.h
new file mode 100644
index 0000000..e56998d
--- /dev/null
+++ b/utils.h
@@ -0,0 +1,37 @@
+/*
+ * utils - misc libubox utility functions
+ *
+ * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __LIBUBOX_UTILS_H
+#define __LIBUBOX_UTILS_H
+
+#include <sys/types.h>
+
+/*
+ * calloc_a(size_t len, [void **addr, size_t len,...], NULL)
+ *
+ * allocate a block of memory big enough to hold multiple aligned objects.
+ * the pointer to the full object (starting with the first chunk) is returned,
+ * all other pointers are stored in the locations behind extra addr arguments.
+ * the last argument needs to be a NULL pointer
+ */
+
+#define calloc_a(len, ...) __calloc_a(len, ##__VA_ARGS__)
+
+void *__calloc_a(size_t len, ...);
+
+#endif