paw: spkg: Add support package groundwork

Signed-off-by: Chloe M. <chloe@mensia.org>

paw/spkg/Makefile

@@ -0,0 +1,25 @@
+#
+# Copyright (c) 2026, Chloe M.
+# Provided under the BSD-3 clause
+#
+# Description:  Support package build script
+# Author:		Chloe M.
+#
+
+.SILENT:
+include ../mk/stos.mk
+
+CFILES = $(shell find . -name "*.c")
+OFILES = $(CFILES:.c=.o)
+
+CFLAGS = 			\
+	$(SYS_CFLAGS)	\
+	-Ihead			\
+	-I$(ST_PROJECT_ROOT)/sdk/head
+
+.PHONY: all
+all: $(OFILES)
+
+%.o: %.c
+	$(PROMPT) "CC" $<
+	$(SYS_CC) -c $(CFLAGS) $< -o $@

paw/spkg/head/string.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: String helpers
+ * Author:      Chloe M.
+ */
+
+#ifndef _SPKG_STRING_H_
+#define _SPKG_STRING_H_ 1
+
+#include <stdef.h>
+
+/*
+ * Compare the differences between two strings
+ *
+ * @Buffer1: First buffer to compare
+ * @Buffer2: Second buffer to compare
+ * @Length:  Number of bytes to compare
+ *
+ * Returns the differences
+ */
+LONG RtlMemCmp(const VOID *Buffer1, const VOID *Buffer2, USIZE Length);
+
+#endif  /* !_SPKG_STRING_H_ */

paw/spkg/lib/memcmp.c

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: RtlMemCmp() implementation
+ * Author:      Chloe M.
+ */
+
+#include <string.h>
+
+LONG
+RtlMemCmp(const VOID *Buffer1, const VOID *Buffer2, USIZE Length)
+{
+    const UCHAR *Ptr1 = Buffer1;
+    const UCHAR *Ptr2 = Buffer2;
+
+    if (Buffer1 == NULL || Buffer2 == NULL) {
+        return 0;
+    }
+
+    if (Length == 0) {
+        return 0;
+    }
+
+    do {
+        if (*Ptr1++ != *Ptr2++) {
+            return (*--Ptr1 - *--Ptr2);
+        }
+    } while (--Length != 0);
+
+    return 0;
+}