From 4cebad3859f8cc4fe526a89ef2277d1db9ee9b7c Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 6 Jul 2021 16:06:23 +0200
Subject: Clear errno before calling strto*() functions

---
 libbutl/standard-version.cxx | 1 +
 1 file changed, 1 insertion(+)

(limited to 'libbutl/standard-version.cxx')

diff --git a/libbutl/standard-version.cxx b/libbutl/standard-version.cxx
index a9f5eb8..863cb29 100644
--- a/libbutl/standard-version.cxx
+++ b/libbutl/standard-version.cxx
@@ -60,6 +60,7 @@ namespace butl
 
     const char* b (s.c_str () + p);
     char* e (nullptr);
+    errno = 0; // We must clear it according to POSIX.
     uint64_t v (strtoull (b, &e, 10)); // Can't throw.
 
     if (errno == ERANGE || b == e || v < min || v > max)
-- 
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