Geografic-Information-System/lib/gis/get_projname.c

/*
 ****************************************************************************
 *
 * MODULE:       GRASS 5 gis library, get_projname.c
 * AUTHOR(S):    unknown
 * PURPOSE:      Get projection name from user
 * COPYRIGHT:    (C) 2000 by the GRASS Development Team
 *
 *               This program is free software under the GNU General Public
 *               License (>=v2). Read the file COPYING that comes with GRASS
 *               for details.
 *
 *****************************************************************************/

#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <grass/gis.h>
#include <grass/glocale.h>

int G_ask_proj_name(char *proj_id, char *proj_name)
{
    char path[GPATH_MAX], buff[GPATH_MAX], answer[50], *a;
    struct Key_Value *in_proj_keys;
    char *Tmp_file;
    FILE *Tmp_fd = NULL;
    int in_stat, i, npr;

    sprintf(path, "%s/etc/projections", G_gisbase());
    while (access(path, 0) != 0)
	G_fatal_error(_("%s not found"), path);
    in_proj_keys = G_read_key_value_file(path, &in_stat);
    if (in_stat != 0)
	G_fatal_error(_("ERROR in reading %s"), path);
    npr = in_proj_keys->nitems;
    Tmp_file = G_tempfile();
    if (NULL == (Tmp_fd = fopen(Tmp_file, "w"))) {
	G_fatal_error(_("Cannot open temp file"));
    }
    for (i = 0; i < npr; i++) {
	fprintf(Tmp_fd, "%s -- %s\n", in_proj_keys->key[i],
		in_proj_keys->value[i]);
    }
    fclose(Tmp_fd);

    for (;;) {

	do {
	    fprintf(stderr, _("\n\nPlease specify projection name\n"));
	    fprintf(stderr,
		    _
		    ("Enter 'list' for the list of available projections\n"));
	    fprintf(stderr, _("Hit RETURN to cancel request\n"));
	    fprintf(stderr, ">");
	} while (!G_gets(answer));

	G_strip(answer);
	if (strlen(answer) == 0)
	    return -1;
	if (strcmp(answer, "list") == 0) {
	    char *pager;

	    pager = getenv("GRASS_PAGER");
	    if (!pager || strlen(pager) == 0)
		pager = "cat";

	    /* Always print interactive output to stderr */
	    sprintf(buff, "%s \"%s\" 1>&2", pager,
		    G_convert_dirseps_to_host(Tmp_file));
	    G_system(buff);
	}
	else {
	    a = G_find_key_value(answer, in_proj_keys);
	    if (a == NULL) {
		fprintf(stderr, _("\ninvalid projection\n"));
	    }
	    else
		break;
	}
    }

    sprintf(proj_id, "%s", answer);
    sprintf(proj_name, "%s", a);
    remove(Tmp_file);
    return 1;
}