X-Git-Url: http://git.subgeniuskitty.com/vvhitespace/.git/blobdiff_plain/d63de3fa849451796c2381723d042f254d434670..ae1f85a178241c826a0b6a72ace12049b9907561:/stdlib/README.md

diff --git a/stdlib/README.md b/stdlib/README.md
index 348cc76..c64be4b 100644
--- a/stdlib/README.md
+++ b/stdlib/README.md
@@ -16,9 +16,12 @@ following reservations:
     0xxxxxxx xxxxxxxx - reserved for private use by stdlib
     1xxxxxxx xxxxxxxx - available for use in user programs
 
-## Heap ##
+## Heap and Pointers ##
 
-    The first 256 heap addresses are reserved when using the stdlib.
+The first 16 heap addresses (`0-15`) are reserved when using the stdlib.
+
+By convention, functions which return a pointer will use the address `0` to
+represent a `NULL` pointer.
 
 # Entry Points #
 
@@ -37,14 +40,23 @@ header comment for each function to learn the call and return stack.
           11000 ----- memset                        (heap.pvvs)
           11001 ----- memcpy                        (heap.pvvs)
           11010 ----- memrand                       (heap.pvvs)
-         100xxx - unassigned
+          11011 ----- memcmp                        (heap.pvvs)
+          11100 ----- memsrch                       (heap.pvvs)
+          11101 ----- <empty>
+          11110 ----- slurp                         (heap.pvvs)
+          11111 ----- spew                          (heap.pvvs)
+         100xxx - string functions
+         100000 ----- strlen                        (string.pvvs)
          101xxx - unassigned
          110xxx - conversion functions
          111xxx - debug functions
          111000 ----- dump heap                     (debug.pvvs)
+         111001 ----- dump stack                    (debug.pvvs)
         1xxxxxx - reserved for less common entry points
-        1000000 ----- print sign of number          (stdio.pvvs)
-        1000001 ----- print magnitude of number     (stdio.pvvs)
+        1000000 ----- slurp registers               (heap.pvvs)
+        1000001 ----- spew registers                (heap.pvvs)
+        1000010 ----- print sign of number          (stdio.pvvs)
+        1000011 ----- print magnitude of number     (stdio.pvvs)
 
 # Misc #
 
@@ -54,3 +66,13 @@ private label space associated with it, formed as follows:
     00001000 xxxxxxxx - for use by 1000
     00001001 xxxxxxxx - for use by 1001
     ...etc
+
+# Slurp and Spew #
+
+The stdlib uses heap[1] to heap[15] as registers.
+
+The `slurpreg` and `spewreg` functions facilitate this by `spew`ing the stack
+onto the heap's pseudo-registers or `slurp`ing the pseudo-registers back to the
+stack.  The functions preserve order in complementary fashion.
+
+The `spewreg` function uses `heap[0]` for storage.