According to the C Standard, subclause 7.21.3, paragraph 6 [ISO/IEC 9899:2011],
...
This noncompliant code example can fail because a by-value copy of stdout
is being used in the call to fputs()
:
Code Block | ||||
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#include <stdio.h> int main(void) { FILE my_stdout = *(stdout); if (fputs("Hello, World!\n", &my_stdout) == EOF) { /* Handle error */ } return 0; } |
For example, this This noncompliant example raises an "access violation" exception at runtime when compiled under Microsoft Visual Studio 2013 and run under Windows.
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In this compliant solution, a copy of the stdout
pointer to the FILE
object is used in the call to fputs()
:
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CERT C++ Secure Coding Standard | FIO38-CPP. Do not use a copy of a FILE object for input and output |
ISO/IEC TS 17961:2013 | Copying a FILE object [filecpy] |
Bibliography
[ISO/IEC 9899:2011] | Subclause 7.21.3, "Files" |
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