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If the C99 {{fgets()}} function fails, the contents of the array it was writing to are [indeterminate| BB. Definitions#indeterminate value] \[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\]. (seeSee also [undefined behavior 161| CC. Undefined Behavior#ub_161] of Annex J.). Consequently, it is necessary to reset the string to a known value to avoid possible errors on subsequent string manipulation functions. |
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CERT This rule appears in the C++ Secure Coding Standard as : FIO40-CPP. Reset strings on fgets() failure.
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\[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\] Section 7.19.7.2, "The {{fgets}} function" and Section 7.24.3.2, "the {{fgetws}} function"
Bibliography
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09. Input Output (FIO) FIO41-C. Do not call getc() or putc() with stream arguments that have side effects