Added memory allocation utility functions

src_features/signMessageEIP712/mem_utils.c

@@ -0,0 +1,43 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "mem.h"
+#include "mem_utils.h"
+
+void    *alloc_and_copy(const void *data, size_t size)
+{
+    void    *mem_ptr;
+
+    if ((mem_ptr = mem_alloc(size)) != NULL)
+    {
+        memmove(mem_ptr, data, size);
+    }
+    return mem_ptr;
+}
+
+char    *alloc_and_copy_char(char c)
+{
+    return alloc_and_copy(&c, sizeof(char));
+}
+
+/**
+ * Format an unsigned number up to 32-bit into memory into an ASCII string.
+ *
+ * @param[in] value Value to write in memory
+ * @param[in] max_chars Maximum number of characters that could be written
+ *
+ * @return how many characters have been written in memory, 0 in case of an allocation error
+ */
+uint8_t format_uint_into_mem(uint32_t value, const uint8_t max_chars)
+{
+    char        *ptr;
+    uint8_t     written_chars;
+
+    if ((ptr = mem_alloc(sizeof(char) * max_chars)) == NULL)
+    {
+        return 0;
+    }
+    written_chars = sprintf(ptr, "%u", value);
+    mem_dealloc(max_chars - written_chars); // in case it ended up being less
+    return written_chars;
+}