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/*
*****************************************************************
* open routines
*
* G__open (element, name, mapset, mode)
* char *element database element name
* char *name map file name
* char *mapset mapset containing map "name"
* int mode 0=read, 1=write, 2=read/write
*
* this is the lowest level open routine.
* opens the file 'name' in 'element' ("cell", etc)
* in mapset 'mapset' according to the i/o 'mode'
*
* mode = 0 (read) will look for 'name' in 'mapset'
* and open the file for read only
* the file must exist
*
* mode = 1 (write) will create an empty file 'name' in the
* current mapset and open the file for write only
* 'mapset' ignored
*
* mode = 2 (read and write) will open a file in the
* current mapset for reading and writing
* creating a new file if necessary
* 'mapset' ignored
*
* returns: open file descriptor (int)
* or -1 could not open
*
*******************************************************************
* G_open_new (element, name)
* char *element database element name
* char *name map file name
*
* creates 'name' in the current mapset and opens it
* for write only.
*
* returns: open file descriptor (int)
* or -1 could not open
*
*******************************************************************
* G_open_old (element, name, mapset)
* char *element database element name
* char *name map file name
* char *mapset mapset containing map "name"
*
* opens 'name' in 'mapset' for read only.
*
* returns: open file descriptor (int)
* or -1 could not open
*
*******************************************************************
* G_fopen_new (element, name)
* char *element database element name
* char *name map file name
*
* creates 'name' in the current mapset and opens it
* for write only.
*
* returns: open file descriptor (FILE *)
* or NULL could not open
*
*******************************************************************
* G_fopen_old (element, name, mapset)
* char *element database element name
* char *name map file name
*
* opens 'name' in 'mapset' for read only.
*
* returns: open file descriptor (FILE *)
* or NULL could not open
*******************************************************************/
#include "config.h"
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "gis.h"
#include <unistd.h>
#include <fcntl.h>
int G__open (
char *element,
char *name,
char *mapset,
int mode)
{
char path[1024];
char xname[512], xmapset[512], *dummy;
G__check_gisinit();
/* READ */
if (mode == 0)
{
if (G__name_is_fully_qualified (name, xname, xmapset))
{
if (strcmp (xmapset, mapset) != 0) {
fprintf(stderr, "G__open(r): mapset (%s) doesn't match xmapset (%s)\n",
mapset,xmapset);
return -1;
}
name = xname;
}
if ((dummy = G_find_file (element, name, mapset)) == NULL)
return -1;
G_free (dummy);
G__file_name (path, element, name, mapset);
return open (path, 0);
}
/* WRITE */
if (mode == 1 || mode == 2)
{
if (G__name_is_fully_qualified (name, xname, xmapset))
{
if (strcmp (xmapset, G_mapset()) != 0) {
fprintf(stderr, "G__open(w): xmapset (%s) != G_mapset() (%s)\n",
xmapset,G_mapset());
return -1;
}
name = xname;
}
if (G_legal_filename(name) == -1)
return -1;
G__file_name (path, element, name, G_mapset());
if(mode == 1 || access(path,0) != 0)
{
G__make_mapset_element (element);
close (creat (path, 0666));
}
return open (path, mode);
}
return -1;
}
/*!
* \brief open a new database file
*
* The database file <b>name</b> under the <b>element</b> in the
* current mapset is created and opened for writing (but not reading).
* The UNIX open( ) routine is used to open the file. If the file does not exist,
* -1 is returned. Otherwise the file is positioned at the end of the file and
* the file descriptor from the open( ) is returned.
*
* \param element
* \param name
* \return int
*/
int G_open_new (char *element,char *name)
{
return G__open (element, name, G_mapset(), 1);
}
/*!
* \brief open a database file for reading
*
* The database file <b>name</b> under the
* <b>element</b> in the specified <b>mapset</b> is opened for reading (but
* not for writing).
* The UNIX open( ) routine is used to open the file. If the file does not exist,
* -1 is returned. Otherwise the file descriptor from the open( ) is returned.
*
* \param element
* \param name
* \param mapset
* \return int
*/
int G_open_old (char *element,char *name,char *mapset)
{
return G__open (element, name, mapset, 0);
}
/*!
* \brief open a database file for update
*
* The database file <b>name</b> under the <b>element</b> in the
* current mapset is opened for reading and writing.
* The UNIX open( ) routine is used to open the file. If the file does not exist,
* -1 is returned. Otherwise the file is positioned at the end of the file and
* the file descriptor from the open( ) is returned.
*
* \param element
* \param name
* \return int
*/
int G_open_update (char *element,char *name)
{
int fd;
fd = G__open (element, name, G_mapset(), 2);
if (fd >= 0) lseek (fd, 0L, 2);
return fd;
}
/*!
* \brief open a new database file
*
* The database file <b>name</b> under the <b>element</b> in the
* current mapset is created and opened for writing (but not reading).
* The UNIX fopen( ) routine, with "w" write mode, is used to open the file. If
* the file does not exist, the NULL pointer is returned. Otherwise the file is
* positioned at the end of the file and the file descriptor from the fopen( ) is
* returned.
*
* \param element
* \param name
* \return FILE *
*/
FILE *G_fopen_new (char *element,char *name)
{
int fd;
fd = G__open (element, name, G_mapset(), 1);
if (fd < 0)
return (FILE *) 0;
return fdopen (fd, "w");
}
/*!
* \brief open a database file for reading
*
* The database file <b>name</b> under the
* <b>element</b> in the specified <b>mapset</b> is opened for reading (but
* not for writing).
* The UNIX fopen( ) routine, with "r" read mode, is used to open the file. If
* the file does not exist, the NULL pointer is returned. Otherwise the file
* descriptor from the fopen( ) is returned.
*
* \param element
* \param name
* \param mapset
* \return FILE *
*/
FILE *
G_fopen_old (char *element,char *name,char *mapset)
{
int fd;
fd = G__open (element, name, mapset, 0);
if (fd < 0)
return (FILE *) 0;
return fdopen (fd, "r");
}
FILE *
G_fopen_append (char *element,char *name)
{
int fd;
fd = G__open (element, name, G_mapset(), 2);
if (fd < 0)
return (FILE *) 0;
lseek (fd, 0L, 2);
return fdopen (fd, "a");
}
FILE *G_fopen_modify (char *element,char *name)
{
int fd;
fd = G__open (element, name, G_mapset(), 2);
if (fd < 0)
return (FILE *) 0;
lseek (fd, 0L, 0);
return fdopen (fd, "r+");
}
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