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forward revert message from low level solidity call


does it comply with ERC20 if transfer() reverts instead returning false?This contract does not implement all functions and thus cannot be createdPadding parameter values in contract low-level callLower level implementation of solidity callGetting error message from require()Solidity: using low level call function on an EOAGet return data from delegatecallHow strings are stored in Solidity on a low level?Solidity: Info on How it works on the low levelremix ERC223: This contract does not implement all functions and thus cannot be created













1















I'm working on a proxy contract that will perform calls as follows:



bool success;
bytes memory returndata;
(success, returndata) = _to.call.value(_value)(_data);
require(success);


this works great, except that, if the call reverts with an error message, this function will simply reverts, hiding the reason string.



How can I retrieve the reason string (I assume in the returndata) and use if to revert properly










share|improve this question


























    1















    I'm working on a proxy contract that will perform calls as follows:



    bool success;
    bytes memory returndata;
    (success, returndata) = _to.call.value(_value)(_data);
    require(success);


    this works great, except that, if the call reverts with an error message, this function will simply reverts, hiding the reason string.



    How can I retrieve the reason string (I assume in the returndata) and use if to revert properly










    share|improve this question
























      1












      1








      1


      2






      I'm working on a proxy contract that will perform calls as follows:



      bool success;
      bytes memory returndata;
      (success, returndata) = _to.call.value(_value)(_data);
      require(success);


      this works great, except that, if the call reverts with an error message, this function will simply reverts, hiding the reason string.



      How can I retrieve the reason string (I assume in the returndata) and use if to revert properly










      share|improve this question














      I'm working on a proxy contract that will perform calls as follows:



      bool success;
      bytes memory returndata;
      (success, returndata) = _to.call.value(_value)(_data);
      require(success);


      this works great, except that, if the call reverts with an error message, this function will simply reverts, hiding the reason string.



      How can I retrieve the reason string (I assume in the returndata) and use if to revert properly







      solidity revert-opcode proxy-contracts






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 2 days ago









      AmxxAmxx

      1135




      1135




















          1 Answer
          1






          active

          oldest

          votes


















          3














          It is simpler than you think:



          require(success, string (returndata));


          See documentation for details. You may also forward raw bytes, but you will need to use assembly.






          share|improve this answer























          • I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

            – Amxx
            2 days ago











          Your Answer








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          1 Answer
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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          3














          It is simpler than you think:



          require(success, string (returndata));


          See documentation for details. You may also forward raw bytes, but you will need to use assembly.






          share|improve this answer























          • I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

            – Amxx
            2 days ago















          3














          It is simpler than you think:



          require(success, string (returndata));


          See documentation for details. You may also forward raw bytes, but you will need to use assembly.






          share|improve this answer























          • I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

            – Amxx
            2 days ago













          3












          3








          3







          It is simpler than you think:



          require(success, string (returndata));


          See documentation for details. You may also forward raw bytes, but you will need to use assembly.






          share|improve this answer













          It is simpler than you think:



          require(success, string (returndata));


          See documentation for details. You may also forward raw bytes, but you will need to use assembly.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 2 days ago









          Mikhail VladimirovMikhail Vladimirov

          1,218315




          1,218315












          • I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

            – Amxx
            2 days ago

















          • I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

            – Amxx
            2 days ago
















          I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

          – Amxx
          2 days ago





          I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P

          – Amxx
          2 days ago

















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