RowIO library - Get a row. More...

#include <stdio.h>
#include <grass/rowio.h>

Include dependency graph for rowio/get.c:

Functions
void *	Rowio_get (ROWIO *R, int row)
	Read a row.

void	Rowio_flush (ROWIO *R)
	Flush data.

Detailed Description

RowIO library - Get a row.

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

Definition in file rowio/get.c.

Function Documentation

◆ Rowio_flush()

void Rowio_flush ( ROWIO * R )

Flush data.

Parameters

R	pointer to ROWIO structure

Definition at line 88 of file rowio/get.c.

References ROWIO::nrows.

◆ Rowio_get()

void * Rowio_get	(	ROWIO *	R,
		int	row
	)

Read a row.

Rowio_get() returns a buffer which holds the data for row from the file associated with ROWIO structure R. If the row requested is not in memory, the getrow() routine specified in Rowio_setup() is called to read row into memory and a pointer to the memory buffer containing the row is returned. If the data currently in the buffer had been changed by Rowio_put(), the putrow() routine specified in Rowio_setup() is called first to write the changed row to disk. If row is already in memory, no disk read is done. The pointer to the data is simply returned.

Parameters

R	pointer to ROWIO structure
row	row number

Returns: NULL on error; pointer to the buffer containing row

Definition at line 40 of file rowio/get.c.

References UntypedStream::buf, ROWIO::buf, ROWIO::cur, ROWIO::fd, ROWIO::getrow, ROWIO::len, ROWIO::nrows, NULL, and ROWIO::rcb.

Functions

Detailed Description

Function Documentation

◆ Rowio_flush()

◆ Rowio_get()