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/*!
\file rowio/put.c
\brief RowIO library - Write a row
(C) 2001-2009 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 Original author CERL
*/
#include <stdio.h>
#include <string.h>
#include <grass/rowio.h>
/*!
* \brief Write a row
*
* Writes the buffer <i>buf</i>, which holds the data for row
* <i>n</i>, into the ROWIO structure <i>r</i>. If the row requested
* is currently in memory, the buffer is simply copied into the
* structure and marked as having been changed. It will be written out
* later. Otherwise it is written immediately. Note that when the row
* is finally written to disk, the putrow() routine specified in
* Rowio_setup() is called to write row <i>n</i> to the
* file. Rowio_flush() force pending updates to disk ROWIO *r;
* Rowio_flush() forces all rows modified by Rowio_put() to be
* written to the file. This routine must be called before closing the
* file or releasing the rowio structure if Rowio_put() has been
* called.
*
* \param R pointer to ROWIO structure
* \param buf pointer to data buffer
* \param row row number
*
* \return
*/
int Rowio_put(ROWIO *R, const void *buf, int row)
{
int i;
if (row < 0)
return 0;
for (i = 0; i < R->nrows; i++)
if (row == R->rcb[i].row) {
memcpy(R->rcb[i].buf, buf, R->len);
R->rcb[i].dirty = 1;
return 1;
}
return ((*R->putrow)(R->fd, buf, row, R->len));
}
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