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/**
* \file put.c
*
* \brief Segment write routines.
*
* 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 2005-2006
*/
#include <string.h>
#include <grass/segment.h>
/*bugfix: buf: char* vs int* -> wrong pointer arithmetics!!!. Pierre de Mouveaux - 09 april 2000 */
/* int segment_put (SEGMENT *SEG,int *buf,int row,int col) */
/**
* \fn int segment_put (SEGMENT *SEG, void *buf, int row, int col)
*
* \brief Write value to segment file.
*
* Provides random write access to the segmented data. It
* copies <i>len</i> bytes of data from <b>buf</b> into the segment
* structure <b>seg</b> for the corresponding <b>row</b> and <b>col</b> in
* the original data matrix.
*
* The data is not written to disk immediately. It is stored in a memory segment
* until the segment routines decide to page the segment to disk.
*
* \param[in,out] seg segment
* \param[in] buf value to write to segment
* \param[in] row
* \param[in] col
* \return 1 if successful
* \return -1 if unable to seek or write segment file
*/
int segment_put(SEGMENT * SEG, const void *buf, int row, int col)
{
int index, n, i;
segment_address(SEG, row, col, &n, &index);
if ((i = segment_pagein(SEG, n)) < 0)
return -1;
SEG->scb[i].dirty = 1;
memcpy(&SEG->scb[i].buf[index], buf, SEG->len);
return 1;
}
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