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/**
* \file zero_cell.c
*
* \brief GIS Library - Zero cell buffer functions.
*
* (C) 2001-2008 by the GRASS Development Team
*
* This program is free software under the GNU General Public License
* (>=v2). Read the file COPYING that comes with GRASS for details.
*
* \author GRASS GIS Development Team
*
* \date 1999-2008
*/
#include <grass/gis.h>
/**
* \brief Zero a raster CELL buffer.
*
* This routines assigns each member of the raster buffer array
* <b>buf</b> to zero. It assumes that <b>buf</b> has been allocated
* using <i>G_allocate_cell_buf.</i>
*
* \param[in] buf
* \return always returns 0
*/
int G_zero_cell_buf(CELL * buf)
{
int i = G_window_cols();
while (i--)
*buf++ = 0;
return 0;
}
/**
* \brief Zero a raster buffer.
*
* This routines assigns each member of the raster buffer array
* <b>rast</b> to zero. It assumes that <b>rast</b> has been allocated
* using <i>G_allocate_cell_buf.</i>
*
* \param[in,out] rast
* \param[in] data_type RASTER_MAP_TYPE
* \return always returns 0
*/
int G_zero_raster_buf(void *rast, RASTER_MAP_TYPE data_type)
{
int i;
unsigned char *ptr;
/* assuming that the size of unsigned char is 1 byte */
i = G_window_cols() * G_raster_size(data_type);
ptr = (unsigned char *)rast;
while (i--)
*ptr++ = 0;
return 0;
}
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