From 80de8876308d924e00d7c3ffd925e2560b285d14 Mon Sep 17 00:00:00 2001
From: John McMaster <johndmcmaster@gmail.com>
Date: Wed, 5 Dec 2018 19:52:07 -0800
Subject: [PATCH] util: specn()

Signed-off-by: John McMaster <johndmcmaster@gmail.com>
---
 prjxray/util.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/prjxray/util.py b/prjxray/util.py
index 1c5621be..87278062 100644
--- a/prjxray/util.py
+++ b/prjxray/util.py
@@ -163,3 +163,9 @@ def gen_tile_bits(db_root, tilej, strict=False, verbose=False):
                     # 31_06
                     _bit_inv, (bit_addroff, bit_bitoff) = parse_tagbit(bitstr)
                     yield (baseaddr + bit_addroff, bitbase + bit_bitoff, tag)
+
+
+def specn():
+    # ex: build/specimen_001
+    specdir = os.getenv("SPECDIR")
+    return int(re.match(".*specimen_([0-9]*)", specdir).group(1), 10)