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This diagnostic rule is based on the MISRA (Motor Industry Software Reliability Association) manual for software development.
This rule only applies to C. The C standard does not define the behavior when the 'fputs' function writes data into a read-only file. Therefore, this is an incorrect behavior.
Look at the example:
void foo(void)
{
FILE *file = fopen("file.txt", "r");
if (file != NULL)
{
fputs(file, "I am writing to the read-only file\n");
fclose(file);
}
}The file.txt file was opened in read-only mode, but at the same time the 'fputs' function writes data into it. The software may behave unpredictably in this situation.
Most likely it's a typo and you need to change the opening mode:
void foo(void)
{
FILE *file = fopen("file.txt", "w");
if (file != NULL)
{
fputs(file, "I am writing to the write-only file\n");
fclose(file);
}
}This diagnostic rule is classified as:
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