[flang-commits] [PATCH] D127420: [flang][runtime] Fix nonadvancing output edge case

[Peter Klausler via Phabricator via flang-commits]

klausler created this revision.
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When nonadvancing output uses T/TL control edit descriptors to reposition
the record, don't reset the position to the furthest point written at
the end of the write.


https://reviews.llvm.org/D127420

Files:
  flang/runtime/io-stmt.cpp


Index: flang/runtime/io-stmt.cpp
===================================================================
--- flang/runtime/io-stmt.cpp
+++ flang/runtime/io-stmt.cpp
@@ -325,10 +325,9 @@
     if (mutableModes().nonAdvancing) {
       // Make effects of positioning past the last Emit() visible with blanks.
       std::int64_t n{unit().positionInRecord - unit().furthestPositionInRecord};
-      unit().positionInRecord = unit().furthestPositionInRecord;
       while (n-- > 0 && unit().Emit(" ", 1, 1, *this)) {
       }
-      unit().leftTabLimit = unit().furthestPositionInRecord;
+      unit().leftTabLimit = unit().positionInRecord;
     } else {
       unit().AdvanceRecord(*this);
     }


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