Function proj_errno_reset

ThirdParty/libproj/vtklibproj/src/4D_api.cpp:1488–1522

/

/*****************************************************************************/
int proj_errno_reset (const PJ *P) {
/******************************************************************************
    Clears errno in the context and thread local levels
    through the low level pj_ctx interface.

    Returns the previous value of the errno, for convenient reset/restore
    operations:

    int foo (PJ *P) {
        // errno may be set on entry, but we need to reset it to be able to
        // check for errors from "do_something_with_P(P)"
        int last_errno = proj_errno_reset (P);

        // local failure
        if (0==P)
            return proj_errno_set (P, 42);

        // call to function that may fail
        do_something_with_P (P);

        // failure in do_something_with_P? - keep latest error status
        if (proj_errno(P))
            return proj_errno (P);

        // success - restore previous error status, return 0
        return proj_errno_restore (P, last_errno);
    }
******************************************************************************/
    int last_errno;
    last_errno = proj_errno (P);

    proj_context_errno_set (pj_get_ctx ((PJ *) P), 0);
    errno = 0;
    return last_errno;
}


/* Create a new context based on the default context */