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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "segment.h"
#include "gis.h"
/* buf is CELL * WRAT code */
/*
* int segment_put_row (SEGMENT *SEG, CELL *buf,int row) */
/*!
* \brief write row to segment file
*
* Transfers nonsegmented matrix data, row by row, into a segment
* file. <b>Seg</b> is the segment structure that was configured from a call
* to <i>segment_init.</i> <b>Buf</b> should contain <i>ncols*len</i>
* bytes of data to be transferred to the segment file. <b>Row</b> specifies
* the row from the data matrix being transferred.
* Return codes are: 1 if ok; else -1 could not seek or write segment file.
*
* \param seg
* \param buf
* \param row
* \return int
*/
int segment_put_row (SEGMENT *SEG, void *buf,int row)
{
int size;
int ncols;
int scols;
int n, index, col;
int result;
ncols = SEG->ncols - SEG->spill ;
scols = SEG->scols ;
size = scols * SEG->len;
/* printf("segment_put_row ncols: %d, scols %d, size: %d, col %d, row: %d, SEG->fd: %d\n",ncols,scols,size,col,row, SEG->fd); */
for (col = 0; col < ncols; col += scols)
{
segment_address (SEG, row, col, &n, &index) ;
if(segment_seek (SEG, n, index) < 0) {
G_warning (
"Failed seek in segment file for index = %d n = %d at col:row %d:%d\n",
index,n,col,row);
return -1;
}
if((result = write (SEG->fd, buf, size)) != size)
{
G_warning ("segment_put_row write error %s\n",strerror(errno));
/* printf("segment_put_row result = %d. ncols: %d, scols %d, size: %d, col %d, row: %d, SEG->fd: %d\n",result,ncols,scols,size,col,row, SEG->fd); */
return -1;
}
/* The buf variable is a void pointer and thus points to anything. */
/* Therefore, it's size is unknown and thus, it cannot be used for */
/* pointer arithmetic (some compilers treat this as an error - SGI */
/* MIPSPro compiler for one). Since the read command is reading in */
/* "size" bytes, cast the buf variable to char * before incrementing */
buf = ((char *) buf) + size;
}
if ((size = SEG->spill * SEG->len))
{
segment_address (SEG, row, col, &n, &index) ;
if(segment_seek (SEG, n, index) < 0) {
G_warning (
"Failed seek in segment file for index = %d n = %d at col:row %d:%d\n",
index,n,col,row);
return -1;
}
if(write (SEG->fd, buf, size) != size)
{
G_warning ("segment_put_row final write error: %s\n",strerror(errno));
return -1;
}
}
return 1;
}
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