SEI CERT C++ Coding Standard

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The C Standard, subclause 7.19.5.3, paragraph 6, places the following restrictions on FILE objects opened for both reading and writing [ISO/IEC 9899:1999]:

When a file is opened with update mode . . ., both input and output may be performed on the associated stream. However, output shall not be directly followed by input without an intervening call to the fflush function or to a file positioning function (fseek, fsetpos, or rewind), and input shall not be directly followed by output without an intervening call to a file positioning function, unless the input operation encounters end-of-file.

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SEI CERT C Coding StandardFIO39-C. Do not alternately input and output from a stream without an intervening flush or positioning call

Bibliography

[ISO/IEC 9899:1999]Subclause 7.19.5.3, "The fopen Function"
[ISO/IEC 14882-2014]Clause 27, "Input/Output Library"

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