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database.c

/*
 *   Copyright (c) by Allin Cottrell
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* database.c for gretl */

#include "gretl.h"
#include "boxplots.h"
#include "database.h"
#include "datafiles.h"
#include "gretl_www.h"
#include "menustate.h"
#include "treeutils.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <zlib.h>
#include <dirent.h>
#include <errno.h>

#if G_BYTE_ORDER == G_BIG_ENDIAN
# include <netinet/in.h>
#endif

#ifdef G_OS_WIN32
# include "gretlwin32.h"
#endif


/* private functions */
static GtkWidget *database_window (windata_t *vwin);
static int make_local_db_series_list (windata_t *vwin);
static int make_remote_db_series_list (windata_t *vwin, char *buf);
static int make_rats_db_series_list (windata_t *vwin);
static int make_pcgive_db_series_list (windata_t *vwin);
static SERIESINFO *get_series_info (windata_t *vwin, int action);

enum db_data_actions {
    DB_DISPLAY,
    DB_GRAPH,
    DB_IMPORT
};

static int utf8_correct (char *orig)
{
    int err = 0;

    if (!g_utf8_validate(orig, -1, NULL)) {
      GError *gerr = NULL;
      gchar *conv;
      gsize wrote;

      conv = g_convert(orig, -1,
                   "UTF-8",
                   "ISO-8859-1",
                   NULL, &wrote, &gerr);

      if (gerr != NULL) {
          errbox(gerr->message);
          g_error_free(gerr);
          strcpy(orig, "invalid string");
          err = 1;
      } else {
          strcpy(orig, conv);
          g_free(conv);
      } 
    }

    return err;
}

static void update_statusline (windata_t *vwin, const char *s)
{
    gchar *tmp = g_strdup_printf(_("Network status: %s"), s);

    gtk_label_set_text(GTK_LABEL(vwin->status), tmp);

    while (gtk_events_pending()) {
      gtk_main_iteration();
    }

    g_free(tmp);
}

static void set_time_series (DATAINFO *pdinfo)
{
    if (pdinfo->pd != 1 || strcmp(pdinfo->stobs, "1")) { 
      pdinfo->structure = TIME_SERIES;
    }
}

#if G_BYTE_ORDER == G_BIG_ENDIAN
typedef struct {
    long frac;
    short exp;
} netfloat;

float retrieve_float (netfloat nf)
{
    short exp = ntohs(nf.exp);
    long frac = ntohl(nf.frac);
    double receive = frac / 10e6;
    
    return ldexp(receive, exp);
}
#endif

void show_network_error (windata_t *vwin)
{
    const char *msg = gretl_errmsg_get();
    char *buf = NULL;

    if (*msg != '\0') {
      buf = gretl_strdup(msg);
    }

    if (buf != NULL) {
      size_t n = strlen(buf);

      if (buf[n-1] == '\n') {
          buf[n-1] = '\0';
      }
      if (vwin != NULL) {
          update_statusline(vwin, buf);
      } else {
          errbox(buf);
      }
      free(buf);
    } else {
      if (vwin != NULL) {
          update_statusline(vwin, _("Error retrieving data from server"));
      } else {
          errbox(_("Error retrieving data from server"));
      }
    }
}

static int gui_get_remote_db_data (windata_t *vwin, SERIESINFO *sinfo, 
                           double **Z)
{
    char *dbbase = vwin->fname;
    int err;

    update_statusline(vwin, _("Retrieving data..."));

    err = get_remote_db_data(dbbase, sinfo, Z);

    if (err) {
      show_network_error(vwin);
      return E_FOPEN;
    } else {
      update_statusline(vwin, "OK");
    }

    return err;
}

static void display_dbdata (const double **dbZ, DATAINFO *dbdinfo)
{
    PRN *prn;

    if (bufopen(&prn)) {
      return;
    }

    printdata(NULL, NULL, dbZ, dbdinfo, OPT_O, prn);
    view_buffer(prn, 36, 350, _("gretl: display database series"), PRINT,
            NULL); 
}

static void graph_dbdata (double ***dbZ, DATAINFO *dbdinfo)
{
    int list[2] = {1, 1};
    int err;

    if (dbdinfo->structure == CROSS_SECTION) {
      err = boxplots(list, NULL, dbZ, dbdinfo, 0);
      if (err) {
          errbox(_("boxplot command failed"));
      }
      return;
    }

    err = gnuplot(list, NULL, (const double **) *dbZ, dbdinfo,
              OPT_G | OPT_O | OPT_T);

    if (err) {
      errbox(_("gnuplot command failed"));
      return;
    }

    register_graph();
}

static gchar *expand_warning (int mult)
{
    return g_strdup_printf(_("Do you really want to add a lower frequency series\n"
                       "to a higher frequency dataset?\n\n"
                       "If you say 'yes' I will expand the source data by\n"
                       "repeating each value %d times.  In general, this is\n"
                       "not a valid thing to do."),
                     mult);
}

static void add_dbdata (windata_t *vwin, double **dbZ, SERIESINFO *sinfo)
{
    double *xvec = NULL;
    int n, t, start, stop, pad1 = 0, pad2 = 0;
    CompactMethod method = COMPACT_AVG;
    int resp, overwrite = 0;

    if (data_status) { 
      /* we already have data in gretl's workspace */
      int dbv;

      if (check_db_import(sinfo, datainfo)) {
          gui_errmsg(1);
          return;
      }

      if (sinfo->pd < datainfo->pd) {
          gchar *msg = expand_warning(datainfo->pd / sinfo->pd);

          resp = yes_no_dialog("gretl", msg, 0);
          g_free(msg);
          if (resp != GRETL_YES) {
            return;
          }
      }

      /* is there already a var of this name? */
      dbv = varindex(datainfo, sinfo->varname);
      if (dbv < datainfo->v) {
          resp = yes_no_dialog ("gretl",                      
                          _("There is already a variable of this name\n"
                            "in the dataset.  OK to overwrite it?"), 0);
          if (resp == GRETL_YES) {
            overwrite = 1;
            /* pick up on pre-registered compaction method? */
            if (COMPACT_METHOD(datainfo, dbv) != COMPACT_NONE) {
                method = COMPACT_METHOD(datainfo, dbv);
            }
          } else {
            return;
          }
      }

      if (!overwrite && dataset_add_series(1, &Z, datainfo)) {
          nomem();
          return;
      }

      n = datainfo->n;

      if (sinfo->pd < datainfo->pd) {
          /* the frequency of the new var is lower: we can handle
             annual to quarterly or monthly, and quarterly to
             monthly
          */
          if (sinfo->pd != 1 && sinfo->pd != 4 && 
            datainfo->pd != 4 && datainfo->pd != 12) {
            errbox(_("Sorry, can't handle this conversion yet!"));
            if (!overwrite) {
                dataset_drop_last_variables(1, &Z, datainfo);
            }
            return;
          }
          xvec = expand_db_series(dbZ[1], sinfo, datainfo->pd);
      } else if (sinfo->pd > datainfo->pd) {
          /* the frequency of the new var is higher */
          if (datainfo->pd != 1 && datainfo->pd != 4 && sinfo->pd != 12) {
            errbox(_("Sorry, can't handle this conversion yet!"));
            if (!overwrite) {
                dataset_drop_last_variables(1, &Z, datainfo);
            }
            return;
          }

          data_compact_dialog(vwin->w, sinfo->pd, &datainfo->pd, NULL, 
                        &method, NULL);

          if (method == COMPACT_NONE) {
            if (!overwrite) {
                dataset_drop_last_variables(1, &Z, datainfo);
            }
            return;
          }
          xvec = compact_db_series(dbZ[1], sinfo, datainfo->pd, 
                             method);
      } else {  
          /* series does not need compacting */
          xvec = mymalloc(sinfo->nobs * sizeof *xvec);
          if (xvec != NULL) {
            for (t=0; t<sinfo->nobs; t++) {
                xvec[t] = dbZ[1][t];
            }
          }
      }

      if (xvec == NULL) {
          nomem();
          if (!overwrite) {
            dataset_drop_last_variables(1, &Z, datainfo);
          }
          return;
      }

      /* common stuff for adding a var */
      strcpy(datainfo->varname[dbv], sinfo->varname);
      strcpy(VARLABEL(datainfo, dbv), sinfo->descrip);
      get_db_padding(sinfo, datainfo, &pad1, &pad2);

      if (pad1 > 0) {
          fprintf(stderr, "Padding at start, %d obs\n", pad1);
          for (t=0; t<pad1; t++) {
            Z[dbv][t] = NADBL;
          }
          start = pad1;
      } else {
          start = 0;
      }

      if (pad2 > 0) {
          fprintf(stderr, "Padding at end, %d obs\n", pad2);
          for (t=n-1; t>=n-1-pad2; t--) {
            Z[dbv][t] = NADBL;
          }
          stop = n - pad2;
      } else {
          stop = n;
      }

      /* fill in actual data values */
      fprintf(stderr, "Filling in values from %d to %d\n", start, stop - 1);
      for (t=start; t<stop; t++) {
          if (xvec[t - pad1] == -999.0) {
            Z[dbv][t] = NADBL;
          } else {
            Z[dbv][t] = xvec[t - pad1];
          }
      }
      free(xvec);
    } else {  
      /* no data open: start new data set with this db series */
      init_datainfo_from_sinfo(datainfo, sinfo);

      /* time series data? */
      set_time_series(datainfo);

      if (start_new_Z(&Z, datainfo, 0)) {
          nomem();
          return;
      }

      for (t=0; t<datainfo->n; t++) {
          Z[1][t] = dbZ[1][t];
      }
          
      strcpy(datainfo->varname[1], sinfo->varname);
      strcpy(VARLABEL(datainfo, 1), sinfo->descrip);  
      data_status |= (GUI_DATA | MODIFIED_DATA);
    }

    register_data(NULL, NULL, 0);
}

static void gui_display_series (GtkWidget *w, windata_t *vwin)
{
    gui_get_db_series(vwin, DB_DISPLAY, NULL);
}

static void gui_graph_series (GtkWidget *w, windata_t *vwin)
{
    gui_get_db_series(vwin, DB_GRAPH, NULL);
}

static void gui_import_series (GtkWidget *w, windata_t *vwin)
{
    gui_get_db_series(vwin, DB_IMPORT, NULL);
}

void import_db_series (windata_t *vwin)
{
    gui_get_db_series(vwin, DB_IMPORT, NULL);
}

void gui_get_db_series (gpointer p, guint action, GtkWidget *w)
{
    windata_t *vwin = (windata_t *) p;
    int err = 0, dbcode = vwin->role;
    DATAINFO *dbinfo;
    SERIESINFO *sinfo;
    double **dbZ = NULL;

    sinfo = get_series_info(vwin, dbcode);
    if (sinfo == NULL) {
      return;
    }

    dbinfo = create_new_dataset(&dbZ, 2, sinfo->nobs, 0);
    if (dbinfo == NULL) {
      nomem();
      return;
    }

    dbinfo->pd = sinfo->pd;

    strcpy(dbinfo->stobs, sinfo->stobs);
    strcpy(dbinfo->endobs, sinfo->endobs);

    colonize_obs(dbinfo->stobs);
    colonize_obs(dbinfo->endobs);

    dbinfo->sd0 = get_date_x(dbinfo->pd, dbinfo->stobs);
    set_time_series(dbinfo);

    if (dbcode == NATIVE_SERIES) { 
      err = get_native_db_data(vwin->fname, sinfo, dbZ);
    } else if (dbcode == REMOTE_SERIES) {
      err = gui_get_remote_db_data(vwin, sinfo, dbZ);
    } else if (dbcode == RATS_SERIES) {
      err = get_rats_db_data(vwin->fname, sinfo, dbZ);
    } else if (dbcode == PCGIVE_SERIES) {
      err = get_pcgive_db_data(vwin->fname, sinfo, dbZ);
    }

    if (action == DB_IMPORT && err == DB_MISSING_DATA) {
      errbox(_("Warning: series has missing observations"));
    }

    if (err && err != DB_MISSING_DATA && dbcode != REMOTE_SERIES) {
      errbox(_("Couldn't access binary datafile"));
      return;
    } 

    strcpy(dbinfo->varname[1], sinfo->varname);
    strcpy(VARLABEL(dbinfo, 1), sinfo->descrip);

    if (action == DB_DISPLAY) {
      display_dbdata((const double **) dbZ, dbinfo);
    } else if (action == DB_GRAPH) {
      graph_dbdata(&dbZ, dbinfo);
    } else if (action == DB_IMPORT) { 
      add_dbdata(vwin, dbZ, sinfo);
    }

    free_Z(dbZ, dbinfo);
    free_datainfo(dbinfo);
    free(sinfo);
} 

static void db_view_codebook (GtkWidget *w, windata_t *vwin)
{
    char cbname[MAXLEN];

    strcpy(cbname, vwin->fname);
    strcat(cbname, ".cb");
    
    view_file(cbname, 0, 0, 78, 350, VIEW_CODEBOOK);
}

static void 
book_callback_wrapper (gpointer p, guint u, GtkWidget *w)
{
    db_view_codebook(w, p);
}

static void db_menu_find (GtkWidget *w, windata_t *vwin)
{
    menu_find(vwin, 1, NULL);
}

static void build_db_popup (windata_t *vwin, int cb)
{
    if (vwin->popup != NULL) {
      return;
    }

    vwin->popup = gtk_menu_new();

    add_popup_item(_("Display"), vwin->popup, 
               G_CALLBACK(gui_display_series), 
               vwin);
    add_popup_item(_("Graph"), vwin->popup, 
               G_CALLBACK(gui_graph_series), 
               vwin);
    add_popup_item(_("Import"), vwin->popup, 
               G_CALLBACK(gui_import_series), 
               vwin);
    add_popup_item(_("Find..."), vwin->popup, 
               G_CALLBACK(db_menu_find), 
               vwin);
    if (cb) {
      add_popup_item(_("Codebook"), vwin->popup, 
                   G_CALLBACK(db_view_codebook), 
                   vwin);
    }
}

static void set_up_db_menu (windata_t *vwin, int cb)
{
    GtkItemFactoryEntry db_items[] = {
      { N_("/_Series/_Display"), NULL, gui_get_db_series, DB_DISPLAY, NULL, GNULL },
      { N_("/_Series/_Graph"), NULL, gui_get_db_series, DB_GRAPH, NULL, GNULL },
      { N_("/_Series/_Import"), NULL, gui_get_db_series, DB_IMPORT, NULL, GNULL },
      { N_("/_Find"), NULL, NULL, 0, "<Branch>", GNULL },   
      { N_("/Find/_Find in window"), NULL, menu_find, 1, "<StockItem>", GTK_STOCK_FIND },
      { N_("/_Codebook"), NULL, NULL, 0, "<Branch>", GNULL },    
      { N_("/Codebook/_Open"), NULL, book_callback_wrapper, 0, "<StockItem>", 
        GTK_STOCK_OPEN }
    };
    gint n_items = sizeof db_items / sizeof db_items[0];

    if (!cb) {
      n_items -= 2;
    }

    vwin->ifac = gtk_item_factory_new(GTK_TYPE_MENU_BAR, "<main>", NULL);
#ifdef ENABLE_NLS
    gtk_item_factory_set_translate_func(vwin->ifac, menu_translate, NULL, NULL);
#endif
    gtk_item_factory_create_items(vwin->ifac, n_items, db_items, vwin);
    vwin->mbar = gtk_item_factory_get_widget(vwin->ifac, "<main>");
}

static void destroy_db_win (GtkWidget *w, gpointer data)
{
    windata_t *vwin = (windata_t *) data;

    if (vwin != NULL) {
      if (vwin->popup != NULL) {
          gtk_widget_destroy(vwin->popup);
      }
      free(vwin);
      vwin = NULL;
    }
}

static void test_db_book (const char *fname, int *cb)
{
    char testname[MAXLEN];
    FILE *fp;

    strcpy(testname, fname);
    strcat(testname, ".cb");

    fp = gretl_fopen(testname, "r");

    if (fp == NULL) {
      *cb = 0;
    } else {
      *cb = 1;
      fclose(fp);
    }
}

static int make_db_series_list (int action, char *fname, char *buf)
{
    GtkWidget *listbox, *closebutton;
    GtkWidget *main_vbox;
    char *titlestr;
    windata_t *vwin;
    int db_width = 700, db_height = 420;
    int cb = 0;
    int err = 0;

    if (action == REMOTE_SERIES && buf == NULL) {
      return 1;
    }

    vwin = mymalloc(sizeof *vwin);
    if (vwin == NULL) {
      return 1;
    }

    windata_init(vwin);
    vwin->role = action;

    vwin->w = gtk_window_new(GTK_WINDOW_TOPLEVEL);

    g_signal_connect(G_OBJECT(vwin->w), "destroy", 
                 G_CALLBACK(destroy_db_win), vwin);

    db_width *= gui_scale;
    db_height *= gui_scale;
    gtk_window_set_default_size(GTK_WINDOW(vwin->w), db_width, db_height);
    
    if (buf == NULL && strrchr(fname, SLASH) != NULL) {
      titlestr = strrchr(fname, SLASH) + 1;
    } else {
      titlestr = fname;
    }

    gtk_window_set_title(GTK_WINDOW(vwin->w), titlestr);

    if (action == NATIVE_SERIES || action == PCGIVE_SERIES) {
      strip_extension(fname);
    }

    strcpy(vwin->fname, fname);
    
    /* set up grids */
    main_vbox = gtk_vbox_new(FALSE, 5);
    gtk_container_set_border_width(GTK_CONTAINER(main_vbox), 10);
    gtk_container_add(GTK_CONTAINER(vwin->w), main_vbox);

    test_db_book(fname, &cb);
    set_up_db_menu(vwin, cb);
    build_db_popup(vwin, cb);

    gtk_box_pack_start(GTK_BOX(main_vbox), vwin->mbar, FALSE, TRUE, 0);
    gtk_widget_show(vwin->mbar);

    listbox = database_window(vwin);
    gtk_box_pack_start(GTK_BOX(main_vbox), listbox, TRUE, TRUE, 0);

    if (action == REMOTE_SERIES) {
      GtkWidget *hbox; 

      hbox = gtk_hbox_new(FALSE, 0);
      gtk_box_pack_start(GTK_BOX(main_vbox), hbox, FALSE, FALSE, 0);
      vwin->status = gtk_label_new(_("Network status: OK"));
      gtk_label_set_justify(GTK_LABEL(vwin->status), GTK_JUSTIFY_LEFT);
      gtk_box_pack_start(GTK_BOX(hbox), vwin->status, FALSE, FALSE, 0);
    }

    closebutton = gtk_button_new_with_label(_("Close"));
    gtk_box_pack_start (GTK_BOX (main_vbox), closebutton, FALSE, TRUE, 0);
    g_signal_connect (G_OBJECT(closebutton), "clicked", 
                  G_CALLBACK(delete_widget), vwin->w);

    if (action == NATIVE_SERIES) { 
      err = make_local_db_series_list(vwin);
    } else if (action == REMOTE_SERIES) { 
      err = make_remote_db_series_list(vwin, buf);
    } else if (action == RATS_SERIES) {
      err = make_rats_db_series_list(vwin);
    } else if (action == PCGIVE_SERIES) {
      err = make_pcgive_db_series_list(vwin);
    }

    if (err) {
      gtk_widget_destroy(vwin->w);
    } else {
      gtk_widget_show_all(vwin->w); 
    }

    return err;
}

void open_rats_window (char *fname)
{
    make_db_series_list(RATS_SERIES, fname, NULL);
}

void open_bn7_window (char *fname)
{
    make_db_series_list(PCGIVE_SERIES, fname, NULL);
}

static int check_serinfo (char *str, char *sername, int *nobs)
{
    char pdc;
    char stobs[OBSLEN], endobs[OBSLEN];
    int err = 0;

    if (!isalpha((unsigned char) sername[0]) || 
      sscanf(str, "%c %10s - %10s %*s = %d", 
             &pdc, stobs, endobs, nobs) != 4 || 
      !isdigit((unsigned char) stobs[0]) || 
      !isdigit((unsigned char) endobs[0]) ||
      (pdc != 'M' && pdc != 'A' && pdc != 'Q' && pdc != 'U' &&
       pdc != 'D' && pdc != 'B')) {
      gchar *msg = g_strdup_printf(_("Database parse error at variable '%s'"), 
                             sername);
      errbox(msg);
      g_free(msg);
      err = 1;
    }

    return err;
}

static char *end_trim (char *s)
{
    size_t i, n = strlen(s);

    for (i=n-1; i>0; i--) {
      if (s[i] == ' ' || s[i] == '\n' || s[i] == '\r') {
          s[i] = '\0';
      } else {
          break;
      }
    }

    return s;
}

static char *start_trim (char *s)
{
    while (*s == ' ') s++;

    return s;
}

static void db_drag_series (GtkWidget *w, GdkDragContext *context,
                      GtkSelectionData *sel, guint info, guint t,
                      windata_t *vwin)
{
    gtk_selection_data_set(sel, GDK_SELECTION_TYPE_INTEGER, 8, 
                     (const guchar *) &vwin, sizeof vwin);
}

static void db_drag_connect (windata_t *vwin)
{
    gtk_drag_source_set(vwin->listbox, GDK_BUTTON1_MASK,
                  &gretl_drag_targets[GRETL_POINTER],
                  1, GDK_ACTION_COPY);

    g_signal_connect(G_OBJECT(vwin->listbox), "drag_data_get",
                 G_CALLBACK(db_drag_series),
                 vwin);
}

static int make_local_db_series_list (windata_t *vwin)
{
    GtkListStore *store;
    GtkTreeIter iter; 
    gchar *row[3];
    char sername[VNAMELEN];
    char line1[256], line2[72], dbidx[MAXLEN];
    FILE *fp;
    size_t n;
    int offset = 0;
    int err = 0;

#if 0
    fprintf(stderr, "make_series_list: vwin->fname = '%s', vwin->data = %p\n",
          vwin->fname, vwin->data);
#endif

    strcpy(dbidx, vwin->fname);
    strcat(dbidx, ".idx");

    fp = gretl_fopen(dbidx, "r");

    if (fp == NULL) {
      errbox(_("Couldn't open database index file"));
      fprintf(stderr, "Couldn't open '%s'\n", dbidx);
      return 1;
    }

    store = GTK_LIST_STORE(gtk_tree_view_get_model 
                     (GTK_TREE_VIEW(vwin->listbox)));
    gtk_list_store_clear(store);
    gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter);

    while (fgets(line1, sizeof line1, fp) != NULL && !err) {
      int nobs = 0;

      if (*line1 == '#') {
          continue;
      }

      err = utf8_correct(line1);

      end_trim(line1);
      charsub(line1, '\t', ' ');

      if (sscanf(line1, "%15s", sername) != 1) {
          break;
      }

      n = strlen(sername);
      row[0] = sername;
      row[1] = start_trim(line1 + n + 1);

      if (fgets(line2, sizeof line2, fp) == NULL) {
          break;
      }

      end_trim(line2);
      row[2] = line2;

      if (!err) {
          err = check_serinfo(line2, sername, &nobs);
      }

      gtk_list_store_append(store, &iter);
      gtk_list_store_set(store, &iter, 0, row[0], 1, row[1],
                     2, row[2], 3, offset * sizeof(dbnumber),
                     -1);

      offset += nobs;
    }

    fclose(fp);

    db_drag_connect(vwin);

    return 0;
}

static int make_remote_db_series_list (windata_t *vwin, char *buf)
{
    GtkListStore *store;
    GtkTreeIter iter;  
    gchar *row[3];
    char sername[VNAMELEN];
    char line1[150], line2[150];
    int offset = 0;
    int n, err = 0;

    store = GTK_LIST_STORE(gtk_tree_view_get_model 
                     (GTK_TREE_VIEW(vwin->listbox)));
    gtk_list_store_clear(store);
    gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter);

    bufgets_init(buf);

    while (bufgets(line1, sizeof line1, buf) && !err) {
      int nobs = 0;

      if (*line1 == '#') {
          continue;
      }

      end_trim(line1);
      charsub(line1, '\t', ' ');

      err = utf8_correct(line1);

      if (sscanf(line1, "%15s", sername) != 1) {
          break;
      }

      n = strlen(sername);
      row[0] = sername;
      row[1] = start_trim(line1 + n + 1);

      if (bufgets(line2, sizeof line2, buf) == NULL) {
          break;
      }

      row[2] = line2;
      if (!err) {
          err = check_serinfo(line2, sername, &nobs);
      }

      gtk_list_store_append(store, &iter);
      gtk_list_store_set (store, &iter, 0, row[0], 1, row[1],
                      2, row[2], 3, nobs * sizeof(dbnumber),
                      -1);

      offset += nobs;
    }

    bufgets_finalize(buf);

    db_drag_connect(vwin);

    return 0;
}

static gchar *iso_comment_to_utf8 (const gchar *src, int *err)
{
    gchar *conv = NULL;

    if (!g_utf8_validate(src, -1, NULL)) {
      GError *gerr = NULL;
      gsize wrote;

      conv = g_convert(src, -1,
                   "UTF-8",
                   "ISO-8859-1",
                   NULL, &wrote, &gerr);

      if (gerr != NULL) {
          if (err != NULL) {
            errbox(gerr->message);
            *err = 1;
          }
          g_error_free(gerr);
      } 
    } else {
      conv = g_strdup(src);
    }

    return conv;
}

static gchar *format_obs_info (SERIESINFO *sinfo)
{
    int pdc = '1';

    if (sinfo->pd == 4) {
      pdc = 'Q';
    } else if (sinfo->pd == 12) {
      pdc = 'M';
    } else if (sinfo->pd == 5) {
      pdc = 'B';
    } else if (sinfo->pd == 6) {
      pdc = 'S';
    } else if (sinfo->pd == 7) {
      pdc = 'D';
    } else if (sinfo->pd == 52) {
      pdc = 'W';
    }

    return g_strdup_printf("%c  %s - %s  n = %d", pdc, 
                     sinfo->stobs, sinfo->endobs, 
                     sinfo->nobs);
}

static void insert_and_free_db_table (db_table *tbl, GtkWidget *w)
{
    GtkTreeView *view = GTK_TREE_VIEW(w);
    GtkListStore *store;
    GtkTreeIter iter;
    int i, err = 0;
    int *perr = &err;

    store = GTK_LIST_STORE(gtk_tree_view_get_model(view));
    gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter);

    for (i=0; i<tbl->nvars; i++) {    
      gchar *obsinfo, *comment = NULL;

      gtk_list_store_append(store, &iter);
      gtk_list_store_set(store, &iter, 0, tbl->sinfo[i].varname, -1);

      if (*tbl->sinfo[i].descrip != 0) {
          comment = iso_comment_to_utf8(tbl->sinfo[i].descrip, perr);
          if (perr != NULL && *perr) {
            /* don't keep displaying error messages */
            perr = NULL;
          }
      } 

      if (comment != NULL) {
          gtk_list_store_set(store, &iter, 1, comment, -1);
          g_free(comment);
      }

      obsinfo = format_obs_info(&tbl->sinfo[i]);
      gtk_list_store_set(store, &iter, 2, obsinfo, -1);
      g_free(obsinfo);

      gtk_list_store_set(store, &iter, 3, tbl->sinfo[i].offset, -1);
    }

    free(tbl->sinfo);
    free(tbl);
}

static int make_rats_db_series_list (windata_t *vwin)
{
    FILE *fp;
    db_table *tbl;

    fp = gretl_fopen(vwin->fname, "rb");

    if (fp == NULL) {
      errbox(_("Couldn't open RATS data file"));
      return 1;
    }

    /* extract catalog from RATS file */
    tbl = read_rats_db(fp);
    fclose(fp);

    if (tbl == NULL) {
      gui_errmsg(1);
      return 1;
    }

    insert_and_free_db_table(tbl, vwin->listbox);
    vwin->active_var = 0;
    db_drag_connect(vwin);

    return 0;
}

static int make_pcgive_db_series_list (windata_t *vwin)
{
    char in7name[FILENAME_MAX];
    FILE *fp;
    db_table *tbl;

    *in7name = 0;
    strncat(in7name, vwin->fname, FILENAME_MAX - 5);
    strcat(in7name, ".in7");

    fp = gretl_fopen(in7name, "r");
    if (fp == NULL) {
      errbox(_("Couldn't open PcGive data file"));
      return 1;
    }

    /* extract catalog from PcGive file */
    tbl = read_pcgive_db(fp);
    fclose(fp);

    if (tbl == NULL) {
      gui_errmsg(1);
      return 1;
    }

    insert_and_free_db_table(tbl, vwin->listbox);
    vwin->active_var = 0;
    db_drag_connect(vwin);

    return 0;
}

static GtkWidget *database_window (windata_t *vwin) 
{
    const char *titles[] = {
      N_("Name"), 
      N_("Description"), 
      N_("Observations")
    };
    GType types[] = {
      G_TYPE_STRING,
      G_TYPE_STRING,
      G_TYPE_STRING,
      G_TYPE_INT
    };
    GtkWidget *box;

    box = gtk_vbox_new(FALSE, 0);
    vwin_add_list_box(vwin, GTK_BOX(box), 4, TRUE, types, titles, 0);
    g_signal_connect(G_OBJECT(vwin->listbox), "button_press_event",
                 G_CALLBACK(popup_menu_handler), 
                 vwin->popup);
    gtk_widget_show(box);

    return box;
}

static SERIESINFO *get_series_info (windata_t *vwin, int action)
{
    char pdc;
    gchar *temp;
    SERIESINFO *sinfo;
    char stobs[OBSLEN], endobs[OBSLEN];

    sinfo = mymalloc(sizeof *sinfo);

    if (sinfo == NULL) {
      return NULL;
    }

    tree_view_get_int(GTK_TREE_VIEW(vwin->listbox), vwin->active_var, 
                  3, &sinfo->offset);

    tree_view_get_string(GTK_TREE_VIEW(vwin->listbox), 
                   vwin->active_var, 0, &temp);

    *sinfo->varname = 0;
    strncat(sinfo->varname, temp, VNAMELEN - 1);
    g_free(temp);

    temp = NULL;
    *sinfo->descrip = 0;
    tree_view_get_string(GTK_TREE_VIEW(vwin->listbox), 
                   vwin->active_var, 1, &temp);
    if (temp != NULL) {
      strncat(sinfo->descrip, temp, MAXLABEL - 1);
      g_free(temp);
    }

    tree_view_get_string(GTK_TREE_VIEW(vwin->listbox), 
                   vwin->active_var, 2, &temp);
    if (sscanf(temp, "%c %10s %*s %10s %*s %*s %d", 
             &pdc, stobs, endobs, &sinfo->nobs) != 4) {
      errbox(_("Failed to parse series information"));
      free(sinfo);
      g_free(temp);
      return NULL;
    }

    g_free(temp);

    sinfo->pd = 1;
    sinfo->undated = 0;

    if (pdc == 'M') {
      sinfo->pd = 12;
    } else if (pdc == 'Q') {
      sinfo->pd = 4;
    } else if (pdc == 'B') {
      sinfo->pd = 5;
    } else if (pdc == 'S') {
      sinfo->pd = 6;
    } else if (pdc == 'D') {
      sinfo->pd = 7;
    } else if (pdc == 'W') {
      sinfo->pd = 52;
    } else if (pdc == 'U') {
      sinfo->undated = 1;
    }

    if (strchr(stobs, '/')) { /* daily data */
      char *q = stobs;
      char *p = strchr(stobs, '/');

      if (p - q == 4) strcpy(sinfo->stobs, q + 2);
      q = endobs;
      p = strchr(endobs, '/');
      if (p && p - q == 4) {
          strcpy(sinfo->endobs, q + 2);
      }
    } else {
      sinfo->stobs[0] = 0;
      sinfo->endobs[0] = 0;
      strncat(sinfo->stobs, stobs, OBSLEN - 1);
      strncat(sinfo->endobs, endobs, OBSLEN - 1);
    }

    return sinfo;
}

void open_named_db_index (char *dbname)
{
    int action;
    FILE *fp;

    if (has_suffix(dbname, ".rat")) {
      action = RATS_SERIES;
    } else if (has_suffix(dbname, ".bn7")) {
      action = PCGIVE_SERIES;
    } else {
      action = NATIVE_SERIES;
    }

    fp = gretl_fopen(dbname, "rb");

    if (fp == NULL && action == NATIVE_SERIES) {
      strcat(dbname, ".bin");
      fp = gretl_fopen(dbname, "rb");
    }

    if (fp == NULL) {
      errbox(_("Couldn't open database"));
    } else {
      fclose(fp);
      make_db_series_list(action, dbname, NULL);
    } 
}

#define KEEP_BROWSER_OPEN 1

void open_db_index (GtkWidget *w, gpointer data)
{
    gchar *fname = NULL, *dbdir = NULL;
    char dbfile[MAXLEN];
    int action = NATIVE_SERIES;
    windata_t *vwin = (windata_t *) data;

    tree_view_get_string(GTK_TREE_VIEW(vwin->listbox), 
                   vwin->active_var, 0, &fname);

    if (has_suffix(fname, ".rat")) {
      action = RATS_SERIES;
    }

    tree_view_get_string(GTK_TREE_VIEW(vwin->listbox), 
                   vwin->active_var, (action == RATS_SERIES)? 1 : 2, 
                   &dbdir);

    build_path(dbfile, dbdir, fname, NULL);
    g_free(fname);
    g_free(dbdir);

    make_db_series_list(action, dbfile, NULL); 

#ifndef KEEP_BROWSER_OPEN
    if (vwin != NULL && vwin->w != NULL && GTK_IS_WIDGET(vwin->w)) {
      gtk_widget_destroy(GTK_WIDGET(vwin->w));
    }
#endif
}

void open_named_remote_db_index (char *dbname)
{
    char *getbuf = NULL;
    int err;

    err = retrieve_remote_db_index(dbname, &getbuf);

    if (err) {
      show_network_error(NULL);
    } else if (getbuf != NULL && !strncmp(getbuf, "Couldn't open", 13)) {
      errbox(getbuf);
    } else {
      make_db_series_list(REMOTE_SERIES, dbname, getbuf);
      /* check for error */
    }

    free(getbuf);
}

void open_remote_db_index (GtkWidget *w, gpointer data)
{
    GtkTreeIter iter;
    GtkTreeModel *model;
    GtkTreeSelection *sel;
    char *getbuf = NULL;
    gchar *fname = NULL;
    windata_t *vwin = (windata_t *) data;
    int err;

    sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(vwin->listbox));
    if (!gtk_tree_selection_get_selected(sel, &model, &iter)) {
      return;
    }

    gtk_tree_model_get(model, &iter, 0, &fname, -1);
    if (fname == NULL || *fname == '\0') {
      g_free(fname);
      return;
    }

    update_statusline(vwin, _("Retrieving data..."));
    err = retrieve_remote_db_index(fname, &getbuf);

    if (err) {
      show_network_error(vwin);
    } else {
      update_statusline(vwin, "OK");
      make_db_series_list(REMOTE_SERIES, fname, getbuf);
    }

    g_free(fname);
    free(getbuf);
}

#define INFOLEN 100

static int parse_db_header (const char *buf, size_t *idxlen, 
                      size_t *datalen, size_t *cblen)
{
    char *p;
    int err = 0;

    *cblen = 0;

    /* length of index file (required) */
    if (sscanf(buf, "%u", idxlen) != 1) {
      err = 1;
    }

    /* length of data (required under "new" system) */
    if (!err) {
      p = strchr(buf, '\n');
      if (p == NULL) {
          err = 1;
      } else if (sscanf(p + 1, "%u", datalen) != 1) {
          err = 1;
      }
    }

    /* length of codebook (optional) */
    if (!err) {
      p = strchr(p + 1, '\n');
      if (p != NULL) {
          int cbl;

          if (sscanf(p + 1, "%u", &cbl) == 1) {
            *cblen = cbl;
          }
      }
    }

    return err;
}

static int ggz_extract (char *errbuf, char *ggzname)
{
    gzFile fgz = NULL;
    FILE *fidx = NULL, *fbin = NULL, *fcbk = NULL;
    size_t idxlen, datalen, bytesleft, bgot;
    size_t cblen = 0;
    char idxname[MAXLEN], binname[MAXLEN], cbname[MAXLEN];
    char gzbuf[GRETL_BUFSIZE];
#if G_BYTE_ORDER == G_BIG_ENDIAN
    netfloat nf;
    float val;
#endif
    int err = 0;

    switch_ext(idxname, ggzname, "idx");
    switch_ext(binname, ggzname, "bin");
    switch_ext(cbname, ggzname, "cb");

    fgz = gzopen(ggzname, "rb");
    if (fgz == NULL) {
        sprintf(errbuf, _("Couldn't gzopen %s for reading\n"), ggzname);
        return 1;
    }

    fidx = gretl_fopen(idxname, "wb");
    if (fidx == NULL) {
        sprintf(errbuf, _("Couldn't open %s for writing\n"), idxname);
      err = 1;
      goto bailout;
    }

    fbin = gretl_fopen(binname, "wb");
    if (fbin == NULL) {
        sprintf(errbuf, _("Couldn't open %s for writing\n"), binname);
      err = 1;
      goto bailout;
    }

    fcbk = gretl_fopen(cbname, "wb");
    if (fcbk == NULL) {
      sprintf(errbuf, _("Couldn't open %s for writing\n"), cbname);
      err = 1;
      goto bailout;
    } 

    memset(gzbuf, GRETL_BUFSIZE, 0);
    gzread(fgz, gzbuf, INFOLEN);

    if (parse_db_header(gzbuf, &idxlen, &datalen, &cblen)) {
      fputs("Error reading info buffer: failed to get byte counts\n",
            stderr);
      err = 1;
      goto bailout;
    }

    bytesleft = idxlen;
    while (bytesleft > 0) {
      memset(gzbuf, 0, GRETL_BUFSIZE);
      bgot = gzread(fgz, gzbuf, (bytesleft > GRETL_BUFSIZE)? 
                  GRETL_BUFSIZE : bytesleft);
      if (bgot <= 0) break;
      bytesleft -= bgot;
      fwrite(gzbuf, 1, bgot, fidx);
    }

    if (bytesleft > 0) {
      fputs("Error reading database info buffer\n", stderr);
      err = 1;
      goto bailout;
    }

    bytesleft = datalen;

    while (bytesleft > 0) {
#if G_BYTE_ORDER == G_BIG_ENDIAN
        if ((bgot = gzread(fgz, gzbuf, sizeof(long) + sizeof(short))) > 0) {
          /* read "netfloats" and write floats */
          memcpy(&(nf.frac), gzbuf, sizeof(long));
          memcpy(&(nf.exp), gzbuf + sizeof(long), sizeof(short));
          val = retrieve_float(nf);
          fwrite(&val, sizeof(float), 1, fbin);
          bytesleft -= sizeof(dbnumber);
      } else break;
#else
      memset(gzbuf, 0, GRETL_BUFSIZE);
      bgot = gzread(fgz, gzbuf, (bytesleft > GRETL_BUFSIZE)? 
                  GRETL_BUFSIZE : bytesleft);
      if (bgot <= 0) break;
      bytesleft -= bgot;
      fwrite(gzbuf, 1, bgot, fbin);
#endif
    }

    if (bytesleft > 0) {
      fputs("Error reading database data\n", stderr);
      err = 1;
      goto bailout;
    }

    bytesleft = cblen;

    while (bytesleft > 0) {
      memset(gzbuf, 0, GRETL_BUFSIZE);
      bgot = gzread(fgz, gzbuf, (bytesleft > GRETL_BUFSIZE)? 
                  GRETL_BUFSIZE : bytesleft);
      if (bgot <= 0) break;
      bytesleft -= bgot;
      fwrite(gzbuf, 1, bgot, fcbk);
    }

    if (bytesleft > 0) {
      fputs("Error reading database codebook\n", stderr);
      err = 1;
    }    

 bailout:

    if (fgz != NULL) gzclose(fgz);
    if (fidx != NULL) fclose(fidx);
    if (fbin != NULL) fclose(fbin);
    if (fcbk != NULL) fclose(fcbk);

    if (cblen == 0) {
      remove(cbname);
    }

    remove(ggzname);

    return err;
}

enum {
    REAL_INSTALL,
    TMP_INSTALL
};

static int real_install_file_from_server (windata_t *vwin, int op)
{
    gchar *objname;
    char fndir[MAXLEN];
    char *target;
    FILE *fp;
    int err = 0;

    if (vwin->role == REMOTE_DB) {
      GtkTreeSelection *sel;
      GtkTreeModel *model;
      GtkTreeIter iter;

      sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(vwin->listbox));
      if (!gtk_tree_selection_get_selected(sel, &model, &iter)) {
          return 1;
      }

      gtk_tree_model_get(model, &iter, 0, &objname, -1);
      if (objname == NULL || *objname == '\0') {
          g_free(objname);
          return 1;
      }
    } else {
      tree_view_get_string(GTK_TREE_VIEW(vwin->listbox), 
                       vwin->active_var, 0, &objname);
    }
    
    target = mymalloc(MAXLEN);
    if (target == NULL) {
      return 1;
    }

    if (vwin->role == REMOTE_FUNC_FILES) {
      if (op == TMP_INSTALL) {
          build_path(target, paths.userdir, "dltmp", NULL);
          err = gretl_tempname(target);
      } else {
          get_default_dir(fndir, SAVE_FUNCTIONS);
          build_path(target, fndir, objname, ".gfn");
      }
    } else {
      build_path(target, paths.binbase, objname, ".ggz");
    }

    if (err) {
      return err;
    }

    /* try test write to target file */

    errno = 0;
    fp = gretl_fopen(target, "w");

    if (fp == NULL) {
      if (errno == EACCES && vwin->role != REMOTE_FUNC_FILES) { 
          /* write to user dir instead? */
          build_path(target, paths.userdir, objname, ".ggz");
      } else {
          errbox(_("Couldn't open %s for writing"), target);
          free(target);
          return 1;
      }
    } else {
      fclose(fp);
    }

    if (vwin->role == REMOTE_FUNC_FILES) {
      err = retrieve_remote_function_package(objname, target);
    } else {
#if G_BYTE_ORDER == G_BIG_ENDIAN
      err = retrieve_remote_db(objname, target, GRAB_NBO_DATA);
#else
      err = retrieve_remote_db(objname, target, GRAB_DATA);
#endif
    }

    if (err) {
      show_network_error(NULL);
      free(objname);
      free(target);
      return err;
    } 

    if (vwin->role == REMOTE_FUNC_FILES) {
      if (op == REAL_INSTALL) {
          infobox(_("Function package installed"));
          populate_filelist(vwin, NULL);
      } else {
          gui_show_function_info(target, VIEW_FUNC_INFO);
      }
    } else {
      char errbuf[80];

      err = ggz_extract(errbuf, target);
      if (err) {
          if (*errbuf == '\0') {
            strcpy(errbuf, _("Error unzipping compressed data"));
          }
          errbox(errbuf);
      } else {
          int resp = yes_no_dialog ("gretl",                      
                              _("Database installed.\n"
                              "Open it now?"), 0);

          if (resp == GRETL_YES) { 
            char dbpath[MAXLEN];
          
            strcpy(dbpath, target);
            strcpy(strrchr(dbpath, '.'), ".bin");
            open_named_db_index(dbpath);
          }
          populate_filelist(vwin, NULL);
      }
    }

    free(objname);
    free(target);

    return 0;
}

void install_file_from_server (GtkWidget *w, gpointer data)
{
    windata_t *vwin = (windata_t *) data;

    real_install_file_from_server(vwin, REAL_INSTALL);
}

void file_info_from_server (GtkWidget *w, gpointer data)
{
    windata_t *vwin = (windata_t *) data;

    real_install_file_from_server(vwin, TMP_INSTALL);
}

static gchar *
real_get_db_description (const char *fullname, const char *binname, 
                   const char *dbdir)
{
    FILE *fp;
    char idxname[FILENAME_MAX];
    char *p, *descrip = NULL;
    
    if (fullname == NULL) {
      build_path(idxname, dbdir, binname, NULL);
    } else {
      strcpy(idxname, fullname);
    }

    p = strrchr(idxname, '.');
    if (p != NULL) {
      strcpy(p, ".idx");
    }

    fp = gretl_fopen(idxname, "r");

    if (fp != NULL) {
      char tmp[DB_DESCRIP_LEN + 32] = {0};

      fgets(tmp, sizeof tmp, fp);
      fclose(fp);
      if (*tmp == '#' && strlen(tmp) > 2) {
          char *s = tmp + 2;

          tailstrip(s);
          utf8_correct(s);
          descrip = g_strdup(s);
      }
    }

    return descrip;
}

gchar *get_db_description (const char *binname)
{
    return real_get_db_description(binname, NULL, NULL);
}

int write_db_description (const char *binname, const char *descrip)
{
    FILE *fnew, *fbak;
    char idxname[FILENAME_MAX];
    char idxtmp[FILENAME_MAX];
    char tmp[64];
    char *p;
    int err = 0;
    
    strcpy(idxname, binname);
    p = strrchr(idxname, '.');
    if (p != NULL) {
      strcpy(p, ".idx");
    }

    strcpy(idxtmp, idxname);
    p = strrchr(idxtmp, '.');
    if (p != NULL) {
      strcpy(p, ".idxtmp");
    }    

    err = copyfile(idxname, idxtmp);

    if (!err) {
      fnew = gretl_fopen(idxname, "w");
      if (fnew == NULL) {
          err = 1;
      } else {
          fbak = gretl_fopen(idxtmp, "r");
          if (fbak == NULL) {
            fclose(fnew);
            err = 1;
          }
      }
    }

    if (!err) {
      const char *p = descrip;
      char line[256];

      while (isspace((unsigned char) *p)) {
          p++;
      }
      sprintf(tmp, "# %.61s\n", p);
      tailstrip(tmp);
      fprintf(fnew, "%s\n", tmp);
      while (fgets(line, sizeof line, fbak)) {
          if (*line != '#') {
            fputs(line, fnew);
          }
      }
      fclose(fnew);
      fclose(fbak);
      remove(idxtmp);
    }

    return err;
}

static int
read_db_files_in_dir (DIR *dir, int dbtype, const char *dbdir, 
                  GtkListStore *store, GtkTreeIter *iter)
{
    struct dirent *dirent;
    const char *fname;
    char *descrip;
    int n, ndb = 0;

    while ((dirent = readdir(dir)) != NULL) {
      fname = dirent->d_name;
      n = strlen(fname);
      if (!g_ascii_strcasecmp(fname + n - 4, ".bin")) {
          descrip = real_get_db_description(NULL, fname, dbdir);
          if (descrip != NULL) {
            gtk_list_store_append(store, iter);
            gtk_list_store_set(store, iter, 0, fname, 1, descrip, 
                           2, dbdir, -1);
            g_free(descrip);
            ndb++;
          }
      }
    }

    return ndb;
}

static void get_local_object_status (char *fname, int role, char *status, 
                             time_t remtime)
{
    char fndir[MAXLEN];
    char fullname[MAXLEN];
    struct stat fbuf;
    int err;

    if (role == REMOTE_DB) {
      build_path(fullname, paths.binbase, fname, NULL);
    } else {
      build_path(fndir, paths.gretldir, "functions", NULL);
      build_path(fullname, fndir, fname, NULL);
    }

    if ((err = stat(fullname, &fbuf)) == -1) {
      if (errno == ENOENT) {
#ifdef G_OS_WIN32
          strcpy(status, _("Not installed"));
#else
          /* try user dir too, if not on Windows */
          if (role == REMOTE_DB) {
            build_path(fullname, paths.userdir, fname, NULL);
          } else {
            build_path(fndir, paths.userdir, "functions", NULL);
            build_path(fullname, fndir, fname, NULL);
          }
          if ((err = stat(fullname, &fbuf)) == -1) {
            strcpy(status, _("Not installed"));
          } 
#endif
      } else {
          strcpy(status, _("Unknown: access error"));
      }
    }

    if (!err) {
      if (difftime(remtime, fbuf.st_ctime) > 360) {
          strcpy(status, _("Not up to date"));
      } else {
          strcpy(status, _("Up to date"));
      }
    }
}

static int read_remote_filetime (char *line, char *fname, time_t *date)
{
    char mon[4], hrs[9];
    int mday, yr;
    struct tm mytime;
    const char *months[] = {
      "Jan", "Feb", "Mar", "Apr",
      "May", "Jun", "Jul", "Aug",
      "Sep", "Oct", "Nov", "Dec"
    };
    int i;

    /* We're expecting a string of the form:

       "<bytes> <day> <mon> <mday> 00:00:00 <year> <filename>"

       where <mon> is 3-letter month, <mday> is 2 digits,
       and <year> is 4-digit year; <day> is not used.
    */

    if (sscanf(line, "%*s%*s%3s%2d%8s%4d%31s", 
             mon, &mday, hrs, &yr, fname) != 5) {
      return 1;
    }

    hrs[2] = 0;

    mytime.tm_sec = 0;
    mytime.tm_min = 0;   
    mytime.tm_wday = 0;   
    mytime.tm_yday = 0;   
    mytime.tm_isdst = -1; 
    mytime.tm_hour = atoi(hrs);
    mytime.tm_year = yr - 1900;
    mytime.tm_mday = mday;
    mytime.tm_mon = 0;

    for (i=0; i<12; i++) {
      if (strcmp(mon, months[i]) == 0) {
          mytime.tm_mon = i;
      }
    }

    *date = mktime(&mytime);

    return 0;
}

/* below: mechanism for tucking individual databases under a twisty,
   when there's a large number of databases from a single source.
*/

static char *get_source_string (char *src, const char *s)
{
    char *p;

    *src = 0;
    strncat(src, s, 95);
    
    p = strchr(src, '(');
    if (p == NULL) {
      p = strstr(src, "--");
    }
    if (p != NULL) {
      *p = '\0';
    }
    tailstrip(src);

    return src;
}

struct src_info {
    int start;
    int ndb;
};

static struct src_info *dbsrc;
static int n_src;

static int push_src_info (int start, int ndb)
{
    struct src_info *tmp;

    tmp = realloc(dbsrc, (n_src + 1) * sizeof *tmp);
    if (tmp == NULL) {
      return E_ALLOC;
    }

    dbsrc = tmp;
    dbsrc[n_src].start = start;
    dbsrc[n_src].ndb = ndb;
    n_src++;

    return 0;
}

static int get_ndbs (int lineno)
{
    int i;

    for (i=0; i<n_src; i++) {
      if (dbsrc[i].start == lineno) {
          return dbsrc[i].ndb;
      }
    }
    
    return 1;
}

static void free_src_info (void)
{
    free(dbsrc);
    dbsrc = NULL;
    n_src = 0;
}

gint populate_remote_db_list (windata_t *vwin)
{
    GtkTreeStore *store;
    GtkTreeIter iter, child_iter; 
    char *getbuf = NULL;
    char line[1024];
    char fname[32], status[20];
    char src[96], srcbak[96];
    gchar *row[3];
    time_t remtime;
    int start, parent, kids;
    int i, ndb, err = 0;

    err = list_remote_dbs(&getbuf);
    if (err) {
      show_network_error(NULL);
      free(getbuf);
      return err;
    }

    i = 0;
    ndb = start = 0;
    src[0] = srcbak[0] = '\0';

    /* first pass: figure "parentage" of databases */

    bufgets_init(getbuf);

    while (bufgets(line, sizeof line, getbuf)) {
      if (strstr(line, "idx")) {
          continue;
      }
      if (read_remote_filetime(line, fname, &remtime)) {
          continue;
      }
      if (bufgets(line, sizeof line, getbuf)) {
          get_source_string(src, line + 2);
          if (strcmp(src, srcbak)) {
            if (ndb > 3) {
                push_src_info(start, ndb);
            }
            start = i;
            ndb = 1;
          } else {
            ndb++;
          }
          strcpy(srcbak, src);
      }
      i++;
    }

    bufgets_finalize(getbuf);

    if (i == 0) {
      errbox(_("No database files found"));
      free_src_info();
      free(getbuf);
      return 1;
    }

    /* second pass: insert databases into tree view */

    store = GTK_TREE_STORE(gtk_tree_view_get_model 
                     (GTK_TREE_VIEW(vwin->listbox)));
    gtk_tree_store_clear(store);
    gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter);

    i = 0;
    parent = kids = 0;

    bufgets_init(getbuf);

    while (bufgets(line, sizeof line, getbuf)) {
      if (strstr(line, "idx")) {
          continue;
      }
      if (read_remote_filetime(line, fname, &remtime)) {
          continue;
      }

      get_local_object_status(fname, vwin->role, status, remtime);
      row[0] = strip_extension(fname);
      row[2] = status;

      if (bufgets(line, sizeof line, getbuf)) {
          utf8_correct(line);
          row[1] = line + 2;
          ndb = get_ndbs(i);
          if (ndb > 1) {
            get_source_string(src, row[1]);
            parent = 1;
            kids = ndb;
          } 
      } else {
          row[1] = NULL;
      }

      if (parent) {
          /* header for child databases */
          gtk_tree_store_append(store, &iter, NULL);
          gtk_tree_store_set(store, &iter, 0, "", 1, src, -1);
          parent = 0;
      }
      
      if (kids > 0) {
          /* insert child under heading */
          gtk_tree_store_insert_before(store, &child_iter, 
                               &iter, NULL);
          gtk_tree_store_set(store, &child_iter, 0, row[0], 
                         1, row[1], 2, row[2], -1);
          kids--;
      } else {
          /* insert at top level */
          gtk_tree_store_append(store, &iter, NULL);
          gtk_tree_store_set(store, &iter, 0, row[0], 1, row[1],
                     2, row[2], -1);
      }         

      i++;
    }

    bufgets_finalize(getbuf);
    free(getbuf);
    free_src_info();

    return err;
}

/* Fill a list box with names, version numbers, and short descriptions
   of function packages, retrieved from server.
*/

gint populate_remote_func_list (windata_t *vwin)
{
    GtkListStore *store;
    GtkTreeIter iter;  
    char *getbuf = NULL;
    char line[1024];
    char fname[32], status[20];
    char *basename;
    char *descrip;
    char *version;
    time_t remtime;
    int n, err = 0;

    err = list_remote_function_packages(&getbuf);
    if (err) {
      show_network_error(NULL);
      free(getbuf);
      return err;
    }

    store = GTK_LIST_STORE(gtk_tree_view_get_model 
                     (GTK_TREE_VIEW(vwin->listbox)));
    gtk_list_store_clear(store);
    gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter);

    n = 0;
    bufgets_init(getbuf);

    while (bufgets(line, sizeof line, getbuf)) {
      descrip = NULL;
      version = NULL;

      if (read_remote_filetime(line, fname, &remtime)) {
          continue;
      }

      get_local_object_status(fname, vwin->role, status, remtime);
      basename = strip_extension(fname);

      if (bufgets(line, sizeof line, getbuf)) {
          utf8_correct(line);
          descrip = gretl_strdup(line + 2);
      } 

      if (bufgets(line, sizeof line, getbuf)) {
          version = line + 2;
      } 

      if (descrip == NULL || version == NULL) {
          free(descrip);
          continue;
      }

      gtk_list_store_append(store, &iter);
      gtk_list_store_set(store, &iter, 
                     0, basename, 
                     1, version,
                     2, descrip, 
                     3, status,
                     -1);

      free(descrip);
      n++;
    }

    bufgets_finalize(getbuf);
    free(getbuf);

    if (n == 0) {
      errbox(_("No function packages found"));
      err = 1;
    }

    return err;
}

gint populate_dbfilelist (windata_t *vwin)
{
    GtkListStore *store;
    GtkTreeIter iter;
    gchar *dbdir = paths.binbase;
    DIR *dir = NULL;
    int tries = 0;
    int ndb = 0;

    while (dir == NULL) {
#ifdef G_OS_WIN32 
      dir = win32_opendir(dbdir);
#else
      dir = opendir(dbdir);
#endif
      if (dir == NULL) {
          errbox(_("Can't open folder %s"), dbdir);
          if (++tries == 2 || options_dialog(1)) {
            /* canceled */
            return 1;
          }
      }
    }

    store = GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(vwin->listbox)));
    gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter);

    ndb = read_db_files_in_dir(dir, vwin->role, dbdir, store, &iter);

    closedir(dir);

#ifndef G_OS_WIN32
    /* pick up any databases in the user's personal dir */
    dbdir = paths.userdir;
    dir = opendir(dbdir);

    if (dir != NULL) {
      ndb += read_db_files_in_dir(dir, vwin->role, dbdir, store, &iter);
      closedir(dir);
    }
#endif /* !G_OS_WIN32 */ 

    if (ndb == 0) {
      errbox(_("No database files found"));
      return 1;
    }

    return 0;
}

static void set_compact_info_from_default (int method)
{
    int i;

    for (i=1; i<datainfo->v; i++) {
      if (COMPACT_METHOD(datainfo, i) == COMPACT_NONE) {
          COMPACT_METHOD(datainfo, i) = method;
      }
    }
}

void do_compact_data_set (void)
{
    CompactMethod method = COMPACT_AVG;
    int err, newpd = 0, monstart = 1;
    int repday = 0;
    int *pmonstart = NULL;

    if (maybe_restore_full_data(COMPACT)) {
      return;
    }

    if (dated_seven_day_data(datainfo)) {
      pmonstart = &monstart;
    }

    data_compact_dialog(mdata->w, datainfo->pd, &newpd, pmonstart, 
                  &method, &repday);

    if (method == COMPACT_NONE) {
      /* the user cancelled */
      return;
    }

    err = compact_data_set(&Z, datainfo, newpd, method, monstart, repday);

    if (err) {
      gui_errmsg(err);
    } else {
      data_status |= MODIFIED_DATA;
      set_sample_label(datainfo);
      if (datainfo->pd == 1 || datainfo->pd == 52) {
          flip(mdata->ifac, "/Data/Compact data...", FALSE);
      }
      set_compact_info_from_default(method);
    }
}

void do_expand_data_set (void)
{
    int err, newpd = 0;

    if (maybe_restore_full_data(EXPAND)) {
      return;
    }

    data_expand_dialog(mdata->w, datainfo->pd, &newpd);
    if (newpd < 0) {
      return;
    }

    err = expand_data_set(&Z, datainfo, newpd);

    if (err) {
      gui_errmsg(err);
    } else {
      data_status |= MODIFIED_DATA;
      set_sample_label(datainfo);
      if (datainfo->pd == 12) {
          flip(mdata->ifac, "/Data/Expand data...", FALSE);
      }
    }
}


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