Added Initial Implementation of memory and allocation function

Signed-off-by: Marc Pervaz Boocha <mboocha@sudomsg.xyz>

On branch main
Your branch is up to date with 'origin/main'.

Changes to be committed:
      new file:   include/alloc.h
      new file:   include/calt.h
      new file:   include/mem.h
      new file:   include/meson.build
      new file:   meson.build
      new file:   meson_options.txt
      new file:   src/alloc/alloc.c
      new file:   src/alloc/calloc.c
      new file:   src/alloc/free.c
      new file:   src/alloc/malloc.c
      new file:   src/alloc/memdup.c
      new file:   src/alloc/meson.build
      new file:   src/alloc/realloc.c
      new file:   src/mem/memccpy.c
      new file:   src/mem/memchr.c
      new file:   src/mem/memcmp.c
      new file:   src/mem/memcpy.c
      new file:   src/mem/memhash.c
      new file:   src/mem/memlen.c
      new file:   src/mem/memmem.c
      new file:   src/mem/memmove.c
      new file:   src/mem/memrchr.c
      new file:   src/mem/memrev.c
      new file:   src/mem/memset.c
      new file:   src/mem/memswap.c
      new file:   src/mem/memzero.c
      new file:   src/mem/meson.build
      new file:   src/meson.build
      new file:   test/alloc/meson.build
      new file:   test/mem/memset.c
      new file:   test/mem/memzero.c
      new file:   test/mem/meson.build
      new file:   test/meson.build

7 files changed, 83 insertions, 0 deletions

diff --git a/src/alloc/alloc.c b/src/alloc/alloc.c
new file mode 100644
index 0000000..0ff8ff4
--- /dev/null
+++ b/src/alloc/alloc.c
@@ -0,0 +1,26 @@
+#include <alloc.h>
+#include <stdlib.h>
+
+static void* stdcalloc(size_t size){
+    return calloc(1, size);
+}
+
+static void* stdmalloc(size_t size){
+    return malloc(size);
+}
+
+static void* stdrealloc(void* ptr, size_t size){
+    return realloc(ptr, size);
+}
+
+static void stdfree(void* ptr){
+    free(ptr);
+}
+
+
+static struct calt_alloc alloc = {
+    .malloc = stdmalloc, .realloc = stdrealloc, .free = stdfree, .calloc = stdcalloc};
+
+void calt_use_custom_alloc(struct calt_alloc allocator) { alloc = allocator; }
+struct calt_alloc calt_get_alloc(void) { return alloc; }
+
diff --git a/src/alloc/calloc.c b/src/alloc/calloc.c
new file mode 100644
index 0000000..666e0ba
--- /dev/null
+++ b/src/alloc/calloc.c
@@ -0,0 +1,13 @@
+#include <alloc.h>
+#include <mem.h>
+
+void *calt_calloc(size_t size) {
+	if (size) {
+		struct calt_alloc alloc = calt_get_alloc();
+		return alloc.calloc ? alloc.calloc(size)
+				    : calt_memzero_null(calt_malloc(size), size);
+	} else {
+		return NULL;
+	}
+}
+
diff --git a/src/alloc/free.c b/src/alloc/free.c
new file mode 100644
index 0000000..ef2654d
--- /dev/null
+++ b/src/alloc/free.c
@@ -0,0 +1,4 @@
+#include <alloc.h>
+
+extern inline void calt_free(void *ptr);
+
diff --git a/src/alloc/malloc.c b/src/alloc/malloc.c
new file mode 100644
index 0000000..9a2e81d
--- /dev/null
+++ b/src/alloc/malloc.c
@@ -0,0 +1,4 @@
+#include <alloc.h>
+
+extern inline void *calt_malloc(size_t size);
+
diff --git a/src/alloc/memdup.c b/src/alloc/memdup.c
new file mode 100644
index 0000000..60aa35e
--- /dev/null
+++ b/src/alloc/memdup.c
@@ -0,0 +1,6 @@
+#include <alloc.h>
+#include <mem.h>
+
+void *calt_memdup(void const *restrict src, size_t len) {
+	return calt_memcpy_null(calt_malloc(len), src, len);
+}
diff --git a/src/alloc/meson.build b/src/alloc/meson.build
new file mode 100644
index 0000000..4f6ff57
--- /dev/null
+++ b/src/alloc/meson.build
@@ -0,0 +1,8 @@
+src += files([
+  'alloc.c',
+  'calloc.c',
+  'free.c',
+  'malloc.c',
+  'memdup.c',
+  'realloc.c',
+])
diff --git a/src/alloc/realloc.c b/src/alloc/realloc.c
new file mode 100644
index 0000000..490ba75
--- /dev/null
+++ b/src/alloc/realloc.c
@@ -0,0 +1,22 @@
+#include <alloc.h>
+#include <mem.h>
+
+void *calt_realloc(void *ptr, size_t size) {
+	if (size) {
+		struct calt_alloc alloc = calt_get_alloc();
+		if (alloc.realloc) {
+			return alloc.realloc(ptr, size);
+		} else {
+			void *new = calt_malloc(size);
+			if (new && (ptr)) {
+				calt_memcpy(new, ptr, size);
+				calt_free(ptr);
+			}
+			return new;
+		}
+	} else {
+		calt_free(ptr);
+		return NULL;
+	}
+}
+