trunk/src/misc.c

/*
 * Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
 *
 * This file is part of GPXView.
 *
 * GPXView 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 3 of the License, or
 * (at your option) any later version.
 *
 * GPXView 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 GPXView.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <math.h>
#include <string.h>
#include <ctype.h>

#include "gpxview.h"

char strlastchr(char *str) {
  return str[strlen(str)]-1;
}

/* make sure the entire path "dir" exists and create it if not */
int checkdir(char *dir) {
  struct stat filestat;
  char *p = dir, tmp;

  /* don't try to create root dir */
  if(p[0] == '/') p++;

  do {
    while(*p && *p != '/') p++;
    tmp = *p;
    *p = 0;

    int err = stat(dir, &filestat);
    if(err) {
      if(mkdir(dir, S_IRWXU) != 0) {
        perror("mkdir()");
        *p++ = tmp;
        return -1;
      }
    } else {
      if(!filestat.st_mode & S_IFDIR) {
        printf("File %s exists and is _no_ directory\n", dir);
        *p++ = tmp;
        return -1;
      }
    }
    
    *p++ = tmp;
  } while(tmp && strchr(p, '/'));

  return 0;
}

void pos_lat_str(char *str, int len, float latitude) {
  char *c = _("N");
  float integral, fractional;

  if(latitude < 0) { latitude = fabs(latitude); c = _("S"); }
  fractional = modff(latitude, &integral);

  snprintf(str, len, "%s %02d° %06.3f'", c, (int)integral, fractional*60.0);
}

GtkWidget *pos_lat(float latitude, int size, int strikethrough) {
  char str[32];

  pos_lat_str(str, sizeof(str), latitude);
  return gtk_label_attrib(str, size, strikethrough);
}

void pos_lon_str(char *str, int len, float longitude) {
  char *c = _("E");
  float integral, fractional;

  if(longitude < 0) { longitude = fabs(longitude); c = _("W"); }
  fractional = modff(longitude, &integral);

  snprintf(str, len, "%s %03d° %06.3f'", c, (int)integral, fractional*60.0);
}

GtkWidget *pos_lon(float longitude, int size, int strikethrough) {
  char str[32];

  pos_lon_str(str, sizeof(str), longitude);
  return gtk_label_attrib(str, size, strikethrough);
}

float pos_parse_lat(char *str) {
  int integral_int;
  float fractional;
  char c;

  if(sscanf(str, "%c %d° %f'", &c, &integral_int, &fractional) == 3) {
    c = toupper(c);
    
    if(c != 'S' && c != 'N')
      return NAN;
    
    /* prevent -0.0 */
    if(!integral_int && (fractional == 0.0))
      return 0.0;

    return ((c == 'S')?-1:+1) * (integral_int + fractional/60.0);
  }
  
  return NAN;
}

float pos_parse_lon(char *str) {
  int integral_int;
  float fractional;
  char c;

  if(sscanf(str, "%c %d° %f'", &c, &integral_int, &fractional) == 3) {
    c = toupper(c);

    /* O is german "Ost" for "East" */
    if(c != 'E' && c != 'W' && c != 'O')
      return NAN;

    /* prevent -0.0 */
    if(!integral_int && (fractional == 0.0))
      return 0.0;

    return ((c == 'W')?-1:+1) * (integral_int + fractional/60.0);
  }

  return NAN;
}

const char *pos_get_bearing_str(pos_t from, pos_t to) {
  static const char *bear_str[]={ 
    "N", "NE", "E", "SE", "S", "SW", "W", "NW" };
  int idx = (gpx_pos_get_bearing(from, to)+22.5)/45.0;
  /* make sure we stay in icon bounds */
  while(idx < 0) idx += 8;
  while(idx > 7) idx -= 8;
  return _(bear_str[idx]);
}

/* the maemo font size is quite huge, so we adjust some fonts */
/* differently on maemo and non-maemo. Basically "BIG" does nothing */
/* on maemo and "SMALL" only does something on maemo */
#ifdef USE_MAEMO
#define MARKUP_SMALL "<span size='small'>%s</span>"
GtkWidget *gtk_label_small(char *str) {
  GtkWidget *label = gtk_label_new("");
  char *markup = g_markup_printf_escaped(MARKUP_SMALL, str);
  gtk_label_set_markup(GTK_LABEL(label), markup);
  g_free(markup);
  return label;
}
#else
#define MARKUP_BIG "<span size='x-large'>%s</span>"
GtkWidget *gtk_label_big(char *str) {
  GtkWidget *label = gtk_label_new("");
  char *markup = g_markup_printf_escaped(MARKUP_BIG, str);
  gtk_label_set_markup(GTK_LABEL(label), markup);
  g_free(markup);
  return label;
}
#endif

void gtk_label_attrib_set(GtkWidget *label, 
                          char *str, int size, int strikethrough) {
  char format[80];

  snprintf(format, sizeof(format), "<span%s%s%s>%%s</span>", 
#ifdef USE_MAEMO
   (size==SIZE_SMALL)?" size='small'":"",
#else
   (size==SIZE_BIG)?" size='x-large'":"",
#endif
   strikethrough?" strikethrough='yes'":"",
   (strikethrough==STRIKETHROUGH_RED)?" strikethrough_color='red'":"");

  char *markup = g_markup_printf_escaped(format, str);
  //  printf("markup = %s\n", markup);
  gtk_label_set_markup(GTK_LABEL(label), markup);
  g_free(markup);
}

GtkWidget *gtk_label_attrib(char *str, int size, int strikethrough) {
  GtkWidget *label = gtk_label_new("");
  gtk_label_attrib_set(label, str, size, strikethrough);
  return label;
}

GtkWidget *gtk_button_attrib(char *str, int size, int strikethrough) {
  GtkWidget *button = gtk_button_new_with_label("");
  gtk_label_attrib_set(gtk_bin_get_child(GTK_BIN(button)), 
                       str, size, strikethrough);
  return button;
}

void textbox_disable(GtkWidget *widget) {
  gtk_editable_set_editable(GTK_EDITABLE(widget), FALSE);
  gtk_widget_set_sensitive(widget, FALSE);
}

void textbox_enable(GtkWidget *widget) {
  gtk_widget_set_sensitive(widget, TRUE);
  gtk_editable_set_editable(GTK_EDITABLE(widget), TRUE);
}

pos_t *get_pos(appdata_t *appdata) {
  pos_t *pos = &appdata->home;

  if(appdata->active_location) {
    int i = appdata->active_location-1;
    location_t *loc = appdata->location;
    while(i--) loc = loc->next;
    pos = &loc->pos;
  }

  if(appdata->use_gps) {
    pos = gps_get_pos(appdata);

    if(!pos) pos = &appdata->gps;   /* use saved position */
    else     appdata->gps = *pos;   /* save position */
  }
  return pos;
}

void distance_str(char *str, int len, float dist, gboolean imperial) {
  if(imperial) {
    /* 1 mil = 1760 yd = 5280 ft ... */
    if(dist<0.018)      snprintf(str, len, "%.1f ft", dist*5280.0);
    else if(dist<0.055) snprintf(str, len, "%.1f yd", dist*1760.0);
    else if(dist<0.55)  snprintf(str, len, "%.0f yd", dist*1760.0);
    else if(dist<10.0)  snprintf(str, len, "%.2f mi", dist);
    else if(dist<100.0) snprintf(str, len, "%.1f mi", dist);
    else                snprintf(str, len, "%.0f mi", dist);
  } else {
    if(dist<0.01)       snprintf(str, len, "%.2f m",  dist*1000.0);
    else if(dist<0.1)   snprintf(str, len, "%.1f m",  dist*1000.0);
    else if(dist<1.0)   snprintf(str, len, "%.0f m",  dist*1000.0);
    else if(dist<100.0) snprintf(str, len, "%.1f km", dist);
    else                snprintf(str, len, "%.0f km", dist);
  }
}

/* return distance in miles or kilometers */
float distance_parse(char *str, gboolean imperial) {
  char unit[4];
  float val = NAN;

  if(sscanf(str, "%f %3s", &val, unit) == 2) {
    gboolean fimp = FALSE;

    if(strcasecmp(unit, "ft") == 0)      { fimp = TRUE;  val /= 5280.0; }
    else if(strcasecmp(unit, "yd") == 0) { fimp = TRUE;  val /= 1760.0; }
    else if(strcasecmp(unit, "mi") == 0) { fimp = TRUE;  }
    else if(strcasecmp(unit, "m")  == 0) { fimp = FALSE; val /= 1000.0; }
    else if(strcasecmp(unit, "km") == 0) { fimp = FALSE; }
    else val = NAN;

    /* found imperial and metric requested? convert miles into kilometers */
    if(fimp & !imperial) val *= 1.609344;

    /* found metric and imperial requested? convert kilometers into miles */
    if(!fimp & imperial) val /= 1.609344;
  }
  return val;
}

static gboolean mark(GtkWidget *widget, gboolean valid) {
  gtk_widget_set_state(widget, valid?GTK_STATE_NORMAL:TAG_STATE);
  return valid;
}

static void callback_modified_lat(GtkWidget *widget, gpointer data ) {
  float i = pos_parse_lat((char*)gtk_entry_get_text(GTK_ENTRY(widget)));
  mark(widget, !isnan(i));
}

/* a entry that is colored red when being "active" */
GtkWidget *lat_entry_new(float lat) {
  GdkColor color;
  GtkWidget *widget = gtk_entry_new();
  gdk_color_parse("#ff0000", &color);
  gtk_widget_modify_text(widget, TAG_STATE, &color);

  char str[32];
  pos_lat_str(str, sizeof(str), lat);
  gtk_entry_set_text(GTK_ENTRY(widget), str);

  g_signal_connect(G_OBJECT(widget), "changed",
                   G_CALLBACK(callback_modified_lat), NULL);
 
  return widget;
}

static void callback_modified_lon(GtkWidget *widget, gpointer data ) {
  float i = pos_parse_lon((char*)gtk_entry_get_text(GTK_ENTRY(widget)));
  mark(widget, !isnan(i));
}

/* a entry that is colored red when filled with invalid coordinate */
GtkWidget *lon_entry_new(float lon) {
  GdkColor color;
  GtkWidget *widget = gtk_entry_new();
  gdk_color_parse("#ff0000", &color);
  gtk_widget_modify_text(widget, TAG_STATE, &color);

  char str[32];
  pos_lon_str(str, sizeof(str), lon);
  gtk_entry_set_text(GTK_ENTRY(widget), str);

  g_signal_connect(G_OBJECT(widget), "changed",
                   G_CALLBACK(callback_modified_lon), NULL);
 
  return widget;
}


float lat_get(GtkWidget *widget) {
  char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
  return pos_parse_lat(p);
}

float lon_get(GtkWidget *widget) {
  char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
  return pos_parse_lon(p);
}

static void callback_modified_dist(GtkWidget *widget, gpointer data ) {
  /* don't care for metric/imperial since we only want to know if this */
  /* is parseable at all */
  float i = distance_parse((char*)gtk_entry_get_text(GTK_ENTRY(widget)), FALSE);
  mark(widget, !isnan(i));
}

/* a entry that is colored red when filled with invalid distance */
GtkWidget *dist_entry_new(float dist, gboolean mil) {
  GdkColor color;
  GtkWidget *widget = gtk_entry_new();
  gdk_color_parse("#ff0000", &color);
  gtk_widget_modify_text(widget, TAG_STATE, &color);

  char str[32];
  distance_str(str, sizeof(str), dist, mil);
  gtk_entry_set_text(GTK_ENTRY(widget), str);

  g_signal_connect(G_OBJECT(widget), "changed",
                   G_CALLBACK(callback_modified_dist), NULL);
 
  return widget;
}

float dist_get(GtkWidget *widget, gboolean mil) {
  char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
  return distance_parse(p, mil);
}

#ifndef USE_MAEMO
#ifdef ENABLE_BROWSER_INTERFACE
#include <libgnome/gnome-url.h>

int browser_url(appdata_t *appdata, char *url) {
  /* taken from gnome-open, part of libgnome */
  GError *err = NULL;
  gnome_url_show(url, &err);
  return 0;
}
#endif
#endif
1	harbaum	1	/*
2			* Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
3			*
4			* This file is part of GPXView.
5			*
6			* GPXView is free software: you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation, either version 3 of the License, or
9			* (at your option) any later version.
10			*
11			* GPXView is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with GPXView. If not, see <http://www.gnu.org/licenses/>.
18			*/
19
20			#include <math.h>
21			#include <string.h>
22			#include <ctype.h>
23
24			#include "gpxview.h"
25
26			char strlastchr(char *str) {
27			return str[strlen(str)]-1;
28			}
29
30			/* make sure the entire path "dir" exists and create it if not */
31			int checkdir(char *dir) {
32			struct stat filestat;
33			char *p = dir, tmp;
34
35			/* don't try to create root dir */
36			if(p[0] == '/') p++;
37
38			do {
39			while(p && p != '/') p++;
40			tmp = *p;
41			*p = 0;
42
43			int err = stat(dir, &filestat);
44			if(err) {
45			if(mkdir(dir, S_IRWXU) != 0) {
46			perror("mkdir()");
47			*p++ = tmp;
48			return -1;
49			}
50			} else {
51			if(!filestat.st_mode & S_IFDIR) {
52			printf("File %s exists and is _no_ directory\n", dir);
53			*p++ = tmp;
54			return -1;
55			}
56			}
57
58			*p++ = tmp;
59			} while(tmp && strchr(p, '/'));
60
61			return 0;
62			}
63
64			void pos_lat_str(char *str, int len, float latitude) {
65			char *c = _("N");
66			float integral, fractional;
67
68			if(latitude < 0) { latitude = fabs(latitude); c = _("S"); }
69			fractional = modff(latitude, &integral);
70
71			snprintf(str, len, "%s %02d° %06.3f'", c, (int)integral, fractional*60.0);
72			}
73
74			GtkWidget *pos_lat(float latitude, int size, int strikethrough) {
75			char str[32];
76
77			pos_lat_str(str, sizeof(str), latitude);
78			return gtk_label_attrib(str, size, strikethrough);
79			}
80
81			void pos_lon_str(char *str, int len, float longitude) {
82			char *c = _("E");
83			float integral, fractional;
84
85			if(longitude < 0) { longitude = fabs(longitude); c = _("W"); }
86			fractional = modff(longitude, &integral);
87
88			snprintf(str, len, "%s %03d° %06.3f'", c, (int)integral, fractional*60.0);
89			}
90
91			GtkWidget *pos_lon(float longitude, int size, int strikethrough) {
92			char str[32];
93
94			pos_lon_str(str, sizeof(str), longitude);
95			return gtk_label_attrib(str, size, strikethrough);
96			}
97
98			float pos_parse_lat(char *str) {
99			int integral_int;
100			float fractional;
101			char c;
102
103			if(sscanf(str, "%c %d° %f'", &c, &integral_int, &fractional) == 3) {
104			c = toupper(c);
105
106			if(c != 'S' && c != 'N')
107			return NAN;
108
109			/* prevent -0.0 */
110			if(!integral_int && (fractional == 0.0))
111			return 0.0;
112
113			return ((c == 'S')?-1:+1) * (integral_int + fractional/60.0);
114			}
115
116			return NAN;
117			}
118
119			float pos_parse_lon(char *str) {
120			int integral_int;
121			float fractional;
122			char c;
123
124			if(sscanf(str, "%c %d° %f'", &c, &integral_int, &fractional) == 3) {
125			c = toupper(c);
126
127			/* O is german "Ost" for "East" */
128			if(c != 'E' && c != 'W' && c != 'O')
129			return NAN;
130
131			/* prevent -0.0 */
132			if(!integral_int && (fractional == 0.0))
133			return 0.0;
134
135			return ((c == 'W')?-1:+1) * (integral_int + fractional/60.0);
136			}
137
138			return NAN;
139			}
140
141			const char *pos_get_bearing_str(pos_t from, pos_t to) {
142			static const char *bear_str[]={
143			"N", "NE", "E", "SE", "S", "SW", "W", "NW" };
144			int idx = (gpx_pos_get_bearing(from, to)+22.5)/45.0;
145			/* make sure we stay in icon bounds */
146			while(idx < 0) idx += 8;
147			while(idx > 7) idx -= 8;
148			return _(bear_str[idx]);
149			}
150
151			/* the maemo font size is quite huge, so we adjust some fonts */
152			/* differently on maemo and non-maemo. Basically "BIG" does nothing */
153			/* on maemo and "SMALL" only does something on maemo */
154			#ifdef USE_MAEMO
155			#define MARKUP_SMALL "<span size='small'>%s</span>"
156			GtkWidget gtk_label_small(char str) {
157			GtkWidget *label = gtk_label_new("");
158			char *markup = g_markup_printf_escaped(MARKUP_SMALL, str);
159			gtk_label_set_markup(GTK_LABEL(label), markup);
160			g_free(markup);
161			return label;
162			}
163			#else
164			#define MARKUP_BIG "<span size='x-large'>%s</span>"
165			GtkWidget gtk_label_big(char str) {
166			GtkWidget *label = gtk_label_new("");
167			char *markup = g_markup_printf_escaped(MARKUP_BIG, str);
168			gtk_label_set_markup(GTK_LABEL(label), markup);
169			g_free(markup);
170			return label;
171			}
172			#endif
173
174			void gtk_label_attrib_set(GtkWidget *label,
175			char *str, int size, int strikethrough) {
176			char format[80];
177
178			snprintf(format, sizeof(format), "<span%s%s%s>%%s</span>",
179			#ifdef USE_MAEMO
180			(size==SIZE_SMALL)?" size='small'":"",
181			#else
182			(size==SIZE_BIG)?" size='x-large'":"",
183			#endif
184			strikethrough?" strikethrough='yes'":"",
185			(strikethrough==STRIKETHROUGH_RED)?" strikethrough_color='red'":"");
186
187			char *markup = g_markup_printf_escaped(format, str);
188			// printf("markup = %s\n", markup);
189			gtk_label_set_markup(GTK_LABEL(label), markup);
190			g_free(markup);
191			}
192
193			GtkWidget gtk_label_attrib(char str, int size, int strikethrough) {
194			GtkWidget *label = gtk_label_new("");
195			gtk_label_attrib_set(label, str, size, strikethrough);
196			return label;
197			}
198
199			GtkWidget gtk_button_attrib(char str, int size, int strikethrough) {
200			GtkWidget *button = gtk_button_new_with_label("");
201			gtk_label_attrib_set(gtk_bin_get_child(GTK_BIN(button)),
202			str, size, strikethrough);
203			return button;
204			}
205
206			void textbox_disable(GtkWidget *widget) {
207			gtk_editable_set_editable(GTK_EDITABLE(widget), FALSE);
208			gtk_widget_set_sensitive(widget, FALSE);
209			}
210
211			void textbox_enable(GtkWidget *widget) {
212			gtk_widget_set_sensitive(widget, TRUE);
213			gtk_editable_set_editable(GTK_EDITABLE(widget), TRUE);
214			}
215
216			pos_t get_pos(appdata_t appdata) {
217			pos_t *pos = &appdata->home;
218
219			if(appdata->active_location) {
220			int i = appdata->active_location-1;
221			location_t *loc = appdata->location;
222			while(i--) loc = loc->next;
223			pos = &loc->pos;
224			}
225
226			if(appdata->use_gps) {
227			pos = gps_get_pos(appdata);
228
229			if(!pos) pos = &appdata->gps; /* use saved position */
230			else appdata->gps = pos; / save position */
231			}
232			return pos;
233			}
234
235			void distance_str(char *str, int len, float dist, gboolean imperial) {
236			if(imperial) {
237			/* 1 mil = 1760 yd = 5280 ft ... */
238			if(dist<0.018) snprintf(str, len, "%.1f ft", dist*5280.0);
239			else if(dist<0.055) snprintf(str, len, "%.1f yd", dist*1760.0);
240			else if(dist<0.55) snprintf(str, len, "%.0f yd", dist*1760.0);
241			else if(dist<10.0) snprintf(str, len, "%.2f mi", dist);
242			else if(dist<100.0) snprintf(str, len, "%.1f mi", dist);
243			else snprintf(str, len, "%.0f mi", dist);
244			} else {
245			if(dist<0.01) snprintf(str, len, "%.2f m", dist*1000.0);
246			else if(dist<0.1) snprintf(str, len, "%.1f m", dist*1000.0);
247			else if(dist<1.0) snprintf(str, len, "%.0f m", dist*1000.0);
248			else if(dist<100.0) snprintf(str, len, "%.1f km", dist);
249			else snprintf(str, len, "%.0f km", dist);
250			}
251			}
252
253			/* return distance in miles or kilometers */
254			float distance_parse(char *str, gboolean imperial) {
255			char unit[4];
256			float val = NAN;
257
258			if(sscanf(str, "%f %3s", &val, unit) == 2) {
259			gboolean fimp = FALSE;
260
261			if(strcasecmp(unit, "ft") == 0) { fimp = TRUE; val /= 5280.0; }
262			else if(strcasecmp(unit, "yd") == 0) { fimp = TRUE; val /= 1760.0; }
263			else if(strcasecmp(unit, "mi") == 0) { fimp = TRUE; }
264			else if(strcasecmp(unit, "m") == 0) { fimp = FALSE; val /= 1000.0; }
265			else if(strcasecmp(unit, "km") == 0) { fimp = FALSE; }
266			else val = NAN;
267
268			/* found imperial and metric requested? convert miles into kilometers */
269			if(fimp & !imperial) val *= 1.609344;
270
271			/* found metric and imperial requested? convert kilometers into miles */
272			if(!fimp & imperial) val /= 1.609344;
273			}
274			return val;
275			}
276
277			static gboolean mark(GtkWidget *widget, gboolean valid) {
278			gtk_widget_set_state(widget, valid?GTK_STATE_NORMAL:TAG_STATE);
279			return valid;
280			}
281
282			static void callback_modified_lat(GtkWidget *widget, gpointer data ) {
283			float i = pos_parse_lat((char*)gtk_entry_get_text(GTK_ENTRY(widget)));
284			mark(widget, !isnan(i));
285			}
286
287			/* a entry that is colored red when being "active" */
288			GtkWidget *lat_entry_new(float lat) {
289			GdkColor color;
290			GtkWidget *widget = gtk_entry_new();
291			gdk_color_parse("#ff0000", &color);
292			gtk_widget_modify_text(widget, TAG_STATE, &color);
293
294			char str[32];
295			pos_lat_str(str, sizeof(str), lat);
296			gtk_entry_set_text(GTK_ENTRY(widget), str);
297
298			g_signal_connect(G_OBJECT(widget), "changed",
299			G_CALLBACK(callback_modified_lat), NULL);
300
301			return widget;
302			}
303
304			static void callback_modified_lon(GtkWidget *widget, gpointer data ) {
305			float i = pos_parse_lon((char*)gtk_entry_get_text(GTK_ENTRY(widget)));
306			mark(widget, !isnan(i));
307			}
308
309			/* a entry that is colored red when filled with invalid coordinate */
310			GtkWidget *lon_entry_new(float lon) {
311			GdkColor color;
312			GtkWidget *widget = gtk_entry_new();
313			gdk_color_parse("#ff0000", &color);
314			gtk_widget_modify_text(widget, TAG_STATE, &color);
315
316			char str[32];
317			pos_lon_str(str, sizeof(str), lon);
318			gtk_entry_set_text(GTK_ENTRY(widget), str);
319
320			g_signal_connect(G_OBJECT(widget), "changed",
321			G_CALLBACK(callback_modified_lon), NULL);
322
323			return widget;
324			}
325
326
327			float lat_get(GtkWidget *widget) {
328			char p = (char)gtk_entry_get_text(GTK_ENTRY(widget));
329			return pos_parse_lat(p);
330			}
331
332			float lon_get(GtkWidget *widget) {
333			char p = (char)gtk_entry_get_text(GTK_ENTRY(widget));
334			return pos_parse_lon(p);
335			}
336
337			static void callback_modified_dist(GtkWidget *widget, gpointer data ) {
338			/* don't care for metric/imperial since we only want to know if this */
339			/* is parseable at all */
340			float i = distance_parse((char*)gtk_entry_get_text(GTK_ENTRY(widget)), FALSE);
341			mark(widget, !isnan(i));
342			}
343
344			/* a entry that is colored red when filled with invalid distance */
345			GtkWidget *dist_entry_new(float dist, gboolean mil) {
346			GdkColor color;
347			GtkWidget *widget = gtk_entry_new();
348			gdk_color_parse("#ff0000", &color);
349			gtk_widget_modify_text(widget, TAG_STATE, &color);
350
351			char str[32];
352			distance_str(str, sizeof(str), dist, mil);
353			gtk_entry_set_text(GTK_ENTRY(widget), str);
354
355			g_signal_connect(G_OBJECT(widget), "changed",
356			G_CALLBACK(callback_modified_dist), NULL);
357
358			return widget;
359			}
360
361			float dist_get(GtkWidget *widget, gboolean mil) {
362			char p = (char)gtk_entry_get_text(GTK_ENTRY(widget));
363			return distance_parse(p, mil);
364			}
365
366			#ifndef USE_MAEMO
367			#ifdef ENABLE_BROWSER_INTERFACE
368			#include <libgnome/gnome-url.h>
369
370			int browser_url(appdata_t appdata, char url) {
371			/* taken from gnome-open, part of libgnome */
372			GError *err = NULL;
373			gnome_url_show(url, &err);
374			return 0;
375			}
376			#endif
377			#endif