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resources.c

/* xscreensaver, Copyright (c) 1992, 1997, 1998, 2001, 2003, 2006
 *  Jamie Zawinski <jwz@jwz.org>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation.  No representations are made about the suitability of this
 * software for any purpose.  It is provided "as is" without express or 
 * implied warranty.
 */

#include "utils.h"
#include "resources.h"

extern char *progname;


#ifndef HAVE_COCOA

#include <X11/Xresource.h>

/* These are the Xlib/Xrm versions of these functions.
   The Cocoa versions are on OSX/XScreenSaverView.m.
 */

extern char *progclass;
extern XrmDatabase XtDatabase (Display *);

static unsigned int get_time_resource (Display *dpy, 
                                       char *res_name, char *res_class,
                               Bool sec_p);

#ifndef isupper
# define isupper(c)  ((c) >= 'A' && (c) <= 'Z')
#endif
#ifndef _tolower
# define _tolower(c)  ((c) - 'A' + 'a')
#endif

char *
get_string_resource (Display *dpy, char *res_name, char *res_class)
{
  XrmValue value;
  char      *type;
  char full_name [1024], full_class [1024];
  strcpy (full_name, progname);
  strcat (full_name, ".");
  strcat (full_name, res_name);
  strcpy (full_class, progclass);
  strcat (full_class, ".");
  strcat (full_class, res_class);
  if (XrmGetResource (XtDatabase (dpy), full_name, full_class, &type, &value))
    {
      char *str = (char *) malloc (value.size + 1);
      strncpy (str, (char *) value.addr, value.size);
      str [value.size] = 0;
      return str;
    }
  return 0;
}

Bool 
get_boolean_resource (Display *dpy, char *res_name, char *res_class)
{
  char *tmp, buf [100];
  char *s = get_string_resource (dpy, res_name, res_class);
  char *os = s;
  if (! s) return 0;
  for (tmp = buf; *s; s++)
    *tmp++ = isupper (*s) ? _tolower (*s) : *s;
  *tmp = 0;
  free (os);

  while (*buf &&
       (buf[strlen(buf)-1] == ' ' ||
        buf[strlen(buf)-1] == '\t'))
    buf[strlen(buf)-1] = 0;

  if (!strcmp (buf, "on") || !strcmp (buf, "true") || !strcmp (buf, "yes"))
    return 1;
  if (!strcmp (buf,"off") || !strcmp (buf, "false") || !strcmp (buf,"no"))
    return 0;
  fprintf (stderr, "%s: %s must be boolean, not %s.\n",
         progname, res_name, buf);
  return 0;
}

int 
get_integer_resource (Display *dpy, char *res_name, char *res_class)
{
  int val;
  char c, *s = get_string_resource (dpy, res_name, res_class);
  char *ss = s;
  if (!s) return 0;

  while (*ss && *ss <= ' ') ss++;               /* skip whitespace */

  if (ss[0] == '0' && (ss[1] == 'x' || ss[1] == 'X')) /* 0x: parse as hex */
    {
      if (1 == sscanf (ss+2, "%x %c", (unsigned int *) &val, &c))
      {
        free (s);
        return val;
      }
    }
  else                                          /* else parse as dec */
    {
      if (1 == sscanf (ss, "%d %c", &val, &c))
      {
        free (s);
        return val;
      }
    }

  fprintf (stderr, "%s: %s must be an integer, not %s.\n",
         progname, res_name, s);
  free (s);
  return 0;
}

double
get_float_resource (Display *dpy, char *res_name, char *res_class)
{
  double val;
  char c, *s = get_string_resource (dpy, res_name, res_class);
  if (! s) return 0.0;
  if (1 == sscanf (s, " %lf %c", &val, &c))
    {
      free (s);
      return val;
    }
  fprintf (stderr, "%s: %s must be a float, not %s.\n",
         progname, res_name, s);
  free (s);
  return 0.0;
}

#endif /* !HAVE_COCOA */


/* These functions are the same with Xlib and Cocoa:
 */


unsigned int
get_pixel_resource (Display *dpy, Colormap cmap,
                    char *res_name, char *res_class)
{
  XColor color;
  char *s = get_string_resource (dpy, res_name, res_class);
  char *s2;
  Bool ok = True;
  if (!s) goto DEFAULT;

  for (s2 = s + strlen(s) - 1; s2 > s; s2--)
    if (*s2 == ' ' || *s2 == '\t')
      *s2 = 0;
    else
      break;

  if (! XParseColor (dpy, cmap, s, &color))
    {
      fprintf (stderr, "%s: can't parse color %s", progname, s);
      ok = False;
      goto DEFAULT;
    }
  if (! XAllocColor (dpy, cmap, &color))
    {
      fprintf (stderr, "%s: couldn't allocate color %s", progname, s);
      ok = False;
      goto DEFAULT;
    }
  free (s);
  return color.pixel;
 DEFAULT:
  if (s) free (s);

  {
    Bool black_p = (strlen(res_class) >= 10 &&
                    !strcasecmp ("Background",
                                 res_class + strlen(res_class) - 10));
    if (!ok)
      fprintf (stderr, ": using %s.\n", (black_p ? "black" : "white"));
    color.flags = DoRed|DoGreen|DoBlue;
    color.red = color.green = color.blue = (black_p ? 0 : 0xFFFF);
    if (XAllocColor (dpy, cmap, &color))
      return color.pixel;
    else
      {
        fprintf (stderr, "%s: couldn't allocate %s either!\n", progname,
                 (black_p ? "black" : "white"));
        /* We can't use BlackPixel/WhitePixel here, because we don't know
           what screen we're allocating on (only an issue when running inside
           the xscreensaver daemon: for hacks, DefaultScreen is fine.)
         */
        return 0;
      }
  }
}


int
parse_time (const char *string, Bool seconds_default_p, Bool silent_p)
{
  unsigned int h, m, s;
  char c;
  if (3 == sscanf (string,   " %u : %2u : %2u %c", &h, &m, &s, &c))
    ;
  else if (2 == sscanf (string, " : %2u : %2u %c", &m, &s, &c) ||
         2 == sscanf (string,    " %u : %2u %c", &m, &s, &c))
    h = 0;
  else if (1 == sscanf (string,       " : %2u %c", &s, &c))
    h = m = 0;
  else if (1 == sscanf (string,          " %u %c",
                  (seconds_default_p ? &s : &m), &c))
    {
      h = 0;
      if (seconds_default_p) m = 0;
      else s = 0;
    }
  else
    {
      if (! silent_p)
      fprintf (stderr, "%s: invalid time interval specification \"%s\".\n",
             progname, string);
      return -1;
    }
  if (s >= 60 && (h != 0 || m != 0))
    {
      if (! silent_p)
      fprintf (stderr, "%s: seconds > 59 in \"%s\".\n", progname, string);
      return -1;
    }
  if (m >= 60 && h > 0)
    {
      if (! silent_p)
      fprintf (stderr, "%s: minutes > 59 in \"%s\".\n", progname, string);
      return -1;
    }
  return ((h * 60 * 60) + (m * 60) + s);
}

static unsigned int 
get_time_resource (Display *dpy, char *res_name, char *res_class, Bool sec_p)
{
  int val;
  char *s = get_string_resource (dpy, res_name, res_class);
  if (!s) return 0;
  val = parse_time (s, sec_p, False);
  free (s);
  return (val < 0 ? 0 : val);
}

unsigned int 
get_seconds_resource (Display *dpy, char *res_name, char *res_class)
{
  return get_time_resource (dpy, res_name, res_class, True);
}

unsigned int 
get_minutes_resource (Display *dpy, char *res_name, char *res_class)
{
  return get_time_resource (dpy, res_name, res_class, False);
}

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