GRASS GIS 8 Programmer's Manual
8.2.2dev(2023)-3d2c704037
rowio/put.c
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/*!
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\file rowio/put.c
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\brief RowIO library - Write a row
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(C) 2001-2009 by the GRASS Development Team
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This program is free software under the GNU General Public License
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(>=v2). Read the file COPYING that comes with GRASS for details.
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\author Original author CERL
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*/
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#include <stdio.h>
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#include <string.h>
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#include <
grass/rowio.h
>
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/*!
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* \brief Write a row
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*
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* Writes the buffer <i>buf</i>, which holds the data for row
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* <i>n</i>, into the ROWIO structure <i>r</i>. If the row requested
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* is currently in memory, the buffer is simply copied into the
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* structure and marked as having been changed. It will be written out
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* later. Otherwise it is written immediately. Note that when the row
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* is finally written to disk, the putrow() routine specified in
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* Rowio_setup() is called to write row <i>n</i> to the
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* file. Rowio_flush() force pending updates to disk ROWIO *r;
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* Rowio_flush() forces all rows modified by Rowio_put() to be
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* written to the file. This routine must be called before closing the
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* file or releasing the rowio structure if Rowio_put() has been
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* called.
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*
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* \param R pointer to ROWIO structure
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* \param buf pointer to data buffer
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* \param row row number
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*
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* \return
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*/
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int
Rowio_put
(
ROWIO
* R,
const
void
*buf,
int
row)
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{
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int
i;
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if
(row < 0)
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return
0;
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for
(i = 0; i < R->
nrows
; i++)
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if
(row == R->
rcb
[i].
row
) {
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memcpy(R->
rcb
[i].
buf
, buf, R->
len
);
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R->
rcb
[i].
dirty
= 1;
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return
1;
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}
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return
((*R->
putrow
) (R->
fd
, buf, row, R->
len
));
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}
ROWIO::ROWIO_RCB::buf
void * buf
Definition:
rowio.h:16
Rowio_put
int Rowio_put(ROWIO *R, const void *buf, int row)
Write a row.
Definition:
rowio/put.c:42
ROWIO::ROWIO_RCB::row
int row
Definition:
rowio.h:18
ROWIO::putrow
int(* putrow)(int, const void *, int, int)
Definition:
rowio.h:12
ROWIO::len
int len
Definition:
rowio.h:8
ROWIO::rcb
struct ROWIO::ROWIO_RCB * rcb
ROWIO
Definition:
rowio.h:4
ROWIO::fd
int fd
Definition:
rowio.h:6
ROWIO::nrows
int nrows
Definition:
rowio.h:7
ROWIO::ROWIO_RCB::dirty
int dirty
Definition:
rowio.h:19
rowio.h
lib
rowio
put.c
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