Synopsis

(Required) The value of errno shall be set to zero prior to a call to an errno-setting-function.

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

errno is not set to zero prior a call to an errno-setting-function.

Coding standards

Code examples

The following code example fails the check and will give a warning:

#include<mc3_types.h>

void f ( void )
{
    float64_t f64;
    f64 = strtod ( "A.12", NULL );
}

The following code example passes the check and will not give a warning about this issue:

#include<mc3_types.h>
#include<errno.h>

void f ( void )
{
    float64_t f64;

    if ( 0 == errno )
        {
            f64 = strtod ( "A.12", NULL );  /* Compliant by exception */
            if ( 0 == errno )
                {
                }
        }
    else
        {
            errno = 0;
            f64 = strtod ( "A.13", NULL ); /* Compliant */
            if ( 0 == errno )
                {
                }
        }
}