Synopsis

(Mandatory) The pointer returned by the Standard Library functions asctime, ctime, gmtime, localtime, localeconv, getenv, setlocale or strerror shall not be used following a subsequent call to the same function.

Enabled by default

Yes

Severity/Certainty

High/Medium

Full description

A pointer returned by asctime, ctime, gmtime, localtime, localeconv, getenv, setlocale or strerror is used after following a subsequent call to the same function.

Coding standards

Code examples

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

#include <stdlib.h>

void f1( void )
{
    const char *res1;
    const char *res2;
    char copy[ 128 ];

    res1 = setlocale ( LC_ALL, 0 );
    ( void ) strcpy ( copy, res1 );
    res2 = setlocale ( LC_MONETARY, "French" );
    /* Non-compliant - use after subsequent call */
    printf ( "%s\n", res1 );
}

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

#include <stdlib.h>

void f1( void )
{
    const char *res1;
    const char *res2;
    char copy[ 128 ];

    res1 = setlocale ( LC_ALL, 0 );
    ( void ) strcpy ( copy, res1 );
    res2 = setlocale ( LC_MONETARY, "French" );
    /* Compliant - copy made before subsequent call */
    printf ( "%s\n", copy );
    /* Compliant - no subsequent call before use */
    printf ( "%s\n", res2 );
}