int QSget_rownames (QSprob p, char **rownames)

A QSprob data structure always contains names for each row of the LP problem; if the application does not give explicit row names, then the QSopt library will generate them when the problem is loaded and as new rows are added. The QSget_rownames function will allocate memory for each of the strings that are returned via the array of pointers in rownames; when the application no longer needs the names, the memory associated with each of the strings should be freed; since the memory for the strings was allocated by the QSopt library, the memory must be freed with calls to QSfree rather than by the system free() function.

/* p is an initialized QSprob, a handle to an existing LP problem  */

int rval, nrows, i;
char **rownames;

nrows = QSget_rowcount (p);
rownames = (char **) malloc (nrows * sizeof (char *));

rval = QSget_rownames (p, rownames);
if (rval) {
    fprintf (stderr, 
             "Could not get row names, error code %d\n", rval);
} else {
    printf ("Constraint Names\n");
    for (i = 0; i < nrows; i++) {
        printf ("%s\n", rownames[i]);
    }

    /* Need to free the individual names */

    for (i = 0; i < nrows; i++) {
        /* Use QSfree for mem allocated by QSopt */
        QSfree (rownames[i]); 
    }
}

/* Use free for mem allocated by system malloc */
free (rownames);