util.c

用于2维的射线追踪

/*
 * Ray2mesh : software for geophysicists.
 * Compute various scores attached to the mesh cells, based on geometric
   information that rays bring when the traverse the cell.
 *
 * Copyright (C) 2003, St閜hane Genaud and Marc Grunberg
 *
 * This tool is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <time.h>
#include <mesh/mesh.h>
#include <mesh/layer.h>
#include <ray/coord.h>

#include "ray2mesh.h"
#include "const_ray2mesh.h"

/**
 * \brief return a date string                            
 **/
char *get_date_stamp()
{
    time_t t;
    struct tm *d;
    char *s;

    s = (char *) malloc(128 * sizeof(char));
    assert(s);
    t = time(NULL);
   
    /* localtime puts result in an internal static object
       and return a pointer to that object
       ie. d doesn't nee to be freed */
    d = localtime(&t);
    sprintf(s, "%.2d/%.2d/%.4d-%.2d:%.2d:%.2d", d->tm_mday, d->tm_mon, d->tm_year + 1900,
	    d->tm_hour, d->tm_min, d->tm_sec);
    return (s);
}