[flang-commits] [PATCH] D115102: [flang] OPEN(RECL=) handling for sequential formatted I/O

[Peter Klausler via Phabricator via flang-commits]

klausler created this revision.
klausler added a reviewer: vdonaldson.
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RECL= is required for direct access I/O, but is permitted
as well for sequential I/O, where it is defined by the
standard to specify a maximum record (line) length.
The standard does not say what should happen when an
sequential formatted input record appears whose length is
unequal to RECL= when it is specified.

Precedents from other compilers are unclear: one raises an error,
some honor RECL= as an effective truncation, and a few ignore the
situation.  On output, all other compilers tested raised an
error when an attempt is made to emit a record longer than RECL=.

This patch treats RECL= as effective truncation on input and
as a hard limit with error on output, and also ensures that
RECL= can be set *longer* than the actual input record lengths.


https://reviews.llvm.org/D115102

Files:
  flang/docs/Extensions.md
  flang/runtime/connection.h
  flang/runtime/internal-unit.cpp
  flang/runtime/io-api.cpp
  flang/runtime/io-stmt.cpp
  flang/runtime/io-stmt.h
  flang/runtime/unit.cpp

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