From 687c014f7eeee5c4f97293df0558d426f9804093 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fl.fischer@fau.de>
Date: Tue, 25 Feb 2020 19:58:24 +0100
Subject: move common allocator functions into malloc.c

---
 src/malloc.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/malloc.c

(limited to 'src/malloc.c')

diff --git a/src/malloc.c b/src/malloc.c
new file mode 100644
index 0000000..4653aa8
--- /dev/null
+++ b/src/malloc.c
@@ -0,0 +1,115 @@
+#include <malloc.h>   /* memalign */
+#include <stdlib.h>   /* malloc, free */
+#include <stddef.h>   /* NULL, size_t */
+#include <stdint.h>   /* uintptr_t */
+#include <string.h>   /* memcpy */
+#include <unistd.h>   /* sysconf */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void* realloc(void* ptr, size_t size) {
+	if(ptr == NULL)
+		return malloc(size);
+
+	void* new_ptr = malloc(size);
+	// this may copies to much
+	memcpy(new_ptr, ptr, size);
+	return new_ptr;
+}
+
+int posix_memalign(void **memptr, size_t alignment, size_t size)
+{
+	void *out;
+
+	if(memptr == NULL) {
+		return 22;
+	}
+
+	if((alignment % sizeof(void*)) != 0) {
+		return 22;
+	}
+
+	/* if not power of two */
+	if(!((alignment != 0) && !(alignment & (alignment - 1)))) {
+		return 22;
+	}
+
+	if(size == 0) {
+		*memptr = NULL;
+		return 0;
+	}
+
+	out = malloc(size);
+	if(out == NULL) {
+		return 12;
+	}
+
+	*memptr = out;
+	return 0;
+}
+
+void* calloc(size_t nmemb, size_t size)
+{
+	void *out;
+	size_t fullsize = nmemb * size;
+
+	if((size != 0) && ((fullsize / size) != nmemb)) {
+		return NULL;
+	}
+	
+	out = malloc(fullsize);
+	if(out == NULL) {
+		return NULL;
+	}
+
+	memset(out, 0, fullsize);
+	return out;
+}
+
+void* valloc(size_t size)
+{
+	long ret = sysconf(_SC_PAGESIZE);
+	if(ret == -1) {
+		return NULL;
+	}
+
+	return memalign(ret, size);
+}
+
+void* pvalloc(size_t size)
+{
+	size_t ps, rem, allocsize;
+
+	long ret = sysconf(_SC_PAGESIZE);
+	if(ret == -1) {
+		return NULL;
+	}
+
+	ps = ret;
+	rem = size % ps;
+	allocsize = size;
+	if(rem != 0) {
+		allocsize = ps + (size - rem);
+	}
+
+	return memalign(ps, allocsize);
+}
+
+void* aligned_alloc(size_t alignment, size_t size)
+{
+	if(alignment > size) {
+		return NULL;
+	}
+
+	if((size % alignment) != 0) {
+		return NULL;
+	}
+
+	return memalign(alignment, size);
+}
+
+#ifdef __cplusplus
+}
+#endif
-- 
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