Geografic-Information-System/vector/v.rectify/env.c

#include <stdio.h>
#include <unistd.h>
#include <grass/gis.h>
#include "global.h"

static int which_env = -1;	/* 0 = cur, 1 = target */

int select_current_env(void)
{
    if (which_env < 0) {
	G_create_alt_env();
	which_env = 0;
    }
    if (which_env != 0) {
	G_switch_env();
	which_env = 0;
    }

    return 0;
}

int select_target_env(void)
{
    if (which_env < 0) {
	G_create_alt_env();
	which_env = 1;
    }
    if (which_env != 1) {
	G_switch_env();
	which_env = 1;
    }

    return 0;
}

int show_env(void)
{
    fprintf(stderr, "env(%d) switch to LOCATION %s, MAPSET %s\n", which_env,
	    G_getenv_nofatal("LOCATION_NAME") ==
	    NULL ? "?" : G_getenv_nofatal("LOCATION_NAME"),
	    G_getenv_nofatal("MAPSET") == NULL ? "?" : G_getenv_nofatal("MAPSET"));
    G_sleep(2);

    return 0;
}