e0

Author: vitstn

ydb/library/yql/public/decimal/ut/yql_decimal_ut.cpp

@@ -216,6 +216,7 @@ Y_UNIT_TEST_SUITE(TYqlDecimalTest) {
         UNIT_ASSERT(FromStringEx("-510e-3", 1, 0) == -1);
         UNIT_ASSERT(FromStringEx("+99E3", 5, 0) == 99000);
         UNIT_ASSERT(FromStringEx("2.1E-130", 35, 2) == 0);
+        UNIT_ASSERT(FromStringEx("2.1E0", 35, 2) == 210);
     }
 
     Y_UNIT_TEST(TestFormStringExInvalidValues) {
@@ -226,7 +227,6 @@ Y_UNIT_TEST_SUITE(TYqlDecimalTest) {
 
         UNIT_ASSERT(IsError(FromStringEx("E2", 35, 15))); // empty
         UNIT_ASSERT(IsError(FromStringEx("E2E4", 35, 15))); // empty
-        UNIT_ASSERT(IsError(FromStringEx("12E0", 35, 15))); // zero isn't avail
         UNIT_ASSERT(IsError(FromStringEx("NANE5", 35, 15))); // nan with exp
     }
 

ydb/library/yql/public/decimal/yql_decimal.cpp

@@ -3,6 +3,7 @@
 #include <cstring>
 #include <ostream>
 #include <string>
+#include <charconv>
 
 namespace NYql {
 namespace NDecimal {
@@ -219,8 +220,13 @@ TInt128 FromStringEx(const TStringBuf& str, ui8 precision, ui8 scale) {
             if (!len)
                 return Err();
 
-            const auto exp = std::atoi(++ptr);
-            if (!exp)
+            ++ptr;
+            if (ptr != s + str.size() && *ptr == '+') {
+                ++ptr;
+            }
+
+            int exp;
+            if (std::from_chars(ptr, s + str.size(), exp).ec != std::errc())
                 return Err();
 
             const int p = precision, s = int(scale) + exp;