From d83d2ba26087305dd044e8d011b775f4a4b89930 Mon Sep 17 00:00:00 2001
From: abolz <lt.morris.schaffer@googlemail.com>
Date: Fri, 15 Jun 2018 10:46:45 +0200
Subject: [PATCH] Trim all zeros from input

If the buffer only contains zeros, return 0.
---
 include/rapidjson/internal/strtod.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/rapidjson/internal/strtod.h b/include/rapidjson/internal/strtod.h
index 5f402d9..7826a8b 100644
--- a/include/rapidjson/internal/strtod.h
+++ b/include/rapidjson/internal/strtod.h
@@ -242,17 +242,21 @@ inline double StrtodFullPrecision(double d, int p, const char* decimals, size_t
     RAPIDJSON_ASSERT(dExp <= INT_MAX - dLen);
 
     // Trim leading zeros
-    while (*decimals == '0' && dLen > 1) {
+    while (dLen > 0 && *decimals == '0') {
         dLen--;
         decimals++;
     }
 
     // Trim trailing zeros
-    while (decimals[dLen - 1] == '0' && dLen > 1) {
+    while (dLen > 0 && decimals[dLen - 1] == '0') {
         dLen--;
         dExp++;
     }
 
+    if (dLen == 0) { // Buffer only contains zeros.
+        return 0.0;
+    }
+
     // Trim right-most digits
     const int kMaxDecimalDigit = 780;
     if (dLen > kMaxDecimalDigit) {