V2600. MISRA. The standard input/output functions should not be used.

This diagnostic rule is based on the MISRA (Motor Industry Software Reliability Association) manual for software development.

The standard library functions from the '<stdio.h>' / '<cstdio>' and '<wchar.h>' header files can be dangerous. Their behavior depends on the implementation. Besides, their use may lead to undefined behavior.

Look at the code fragment:

#include <stdio.h>

void InputFromFile(FILE *file); // Read from 'file'

void foo()
{
  FILE *stream;
  ....
  InputFromFile(stream);
  fflush(stream);
}

First, the code reads data via the 'stream' file descriptor, which is then passed to the 'fflush' function. This sequence of operations leads to undefined behavior.

The analyzer issues a warning if it detects the use of any functions defined in the '<stdio.h>' / '<cstdio>' and '<wchar.h>' header files:

• fopen;
• fclose;
• freopen;
• fflush;
• setbuf;
• setvbuf;
• etc.

For example, the analyzer issues a warning for the code below:

#include <stdio.h>

void foo(const char *filename, FILE *oldFd)
{
  FILE *newFd = freopen(filename, "r", oldFd);
  ....
}

This diagnostic is classified as:

Was this page helpful?

Message submitted.

Your message has been sent. We will email you at

If you do not see the email in your inbox, please check if it is filtered to one of the following folders:

• Promotion
• Updates
• Spam

If you can’t find an answer to your question, fill in the form below and our developers will contact you

By clicking this button you agree to our Privacy Policy statement