GRASS GIS 8 Programmer's Manual 8.4.1(2025)-45ca3179ab
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rowio/put.c
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1/*!
2 \file rowio/put.c
3
4 \brief RowIO library - Write a row
5
6 (C) 2001-2009 by the GRASS Development Team
7
8 This program is free software under the GNU General Public License
9 (>=v2). Read the file COPYING that comes with GRASS for details.
10
11 \author Original author CERL
12 */
13
14#include <stdio.h>
15#include <string.h>
16#include <grass/rowio.h>
17
18/*!
19 * \brief Write a row
20 *
21 * Writes the buffer <i>buf</i>, which holds the data for row
22 * <i>n</i>, into the ROWIO structure <i>r</i>. If the row requested
23 * is currently in memory, the buffer is simply copied into the
24 * structure and marked as having been changed. It will be written out
25 * later. Otherwise it is written immediately. Note that when the row
26 * is finally written to disk, the putrow() routine specified in
27 * Rowio_setup() is called to write row <i>n</i> to the
28 * file. Rowio_flush() force pending updates to disk ROWIO *r;
29 * Rowio_flush() forces all rows modified by Rowio_put() to be
30 * written to the file. This routine must be called before closing the
31 * file or releasing the rowio structure if Rowio_put() has been
32 * called.
33 *
34 * \param R pointer to ROWIO structure
35 * \param buf pointer to data buffer
36 * \param row row number
37 *
38 * \return
39 */
40
41int Rowio_put(ROWIO *R, const void *buf, int row)
42{
43 int i;
44
45 if (row < 0)
46 return 0;
47
48 for (i = 0; i < R->nrows; i++)
49 if (row == R->rcb[i].row) {
50 memcpy(R->rcb[i].buf, buf, R->len);
51 R->rcb[i].dirty = 1;
52 return 1;
53 }
54 return ((*R->putrow)(R->fd, buf, row, R->len));
55}
int Rowio_put(ROWIO *R, const void *buf, int row)
Write a row.
Definition rowio/put.c:41