source: util.c @ 0b20de4

release-1.8release-1.9
Last change on this file since 0b20de4 was e56303f, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Replace owl_parse_delete with g_strfreev Also cut the pointless g_strdup in owl_cmddict_execute and allow argc to be NULL if we don't care about the value.
  • Property mode set to 100644
File size: 19.8 KB
Line 
1#include "owl.h"
2#include <stdlib.h>
3#include <string.h>
4#include <unistd.h>
5#include <ctype.h>
6#include <pwd.h>
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <assert.h>
10#include <stdarg.h>
11#include <glib.h>
12#include <glib/gstdio.h>
13#include <glib-object.h>
14
15const char *skiptokens(const char *buff, int n) {
16  /* skips n tokens and returns where that would be. */
17  char quote = 0;
18  while (*buff && n>0) {
19      while (*buff == ' ') buff++;
20      while (*buff && (quote || *buff != ' ')) {
21        if(quote) {
22          if(*buff == quote) quote = 0;
23        } else if(*buff == '"' || *buff == '\'') {
24          quote = *buff;
25        }
26        buff++;
27      }
28      while (*buff == ' ') buff++;
29      n--;
30  }
31  return buff;
32}
33
34/* Return a "nice" version of the path.  Tilde expansion is done, and
35 * duplicate slashes are removed.  Caller must free the return.
36 */
37char *owl_util_makepath(const char *in)
38{
39  int i, j, x;
40  char *out, user[MAXPATHLEN];
41  struct passwd *pw;
42
43  out=g_new(char, MAXPATHLEN+1);
44  out[0]='\0';
45  j=strlen(in);
46  x=0;
47  for (i=0; i<j; i++) {
48    if (in[i]=='~') {
49      if ( (i==(j-1)) ||          /* last character */
50           (in[i+1]=='/') ) {     /* ~/ */
51        /* use my homedir */
52        pw=getpwuid(getuid());
53        if (!pw) {
54          out[x]=in[i];
55        } else {
56          out[x]='\0';
57          strcat(out, pw->pw_dir);
58          x+=strlen(pw->pw_dir);
59        }
60      } else {
61        /* another user homedir */
62        int a, b;
63        b=0;
64        for (a=i+1; i<j; a++) {
65          if (in[a]==' ' || in[a]=='/') {
66            break;
67          } else {
68            user[b]=in[a];
69            i++;
70            b++;
71          }
72        }
73        user[b]='\0';
74        pw=getpwnam(user);
75        if (!pw) {
76          out[x]=in[i];
77        } else {
78          out[x]='\0';
79          strcat(out, pw->pw_dir);
80          x+=strlen(pw->pw_dir);
81        }
82      }
83    } else if (in[i]=='/') {
84      /* check for a double / */
85      if (i<(j-1) && (in[i+1]=='/')) {
86        /* do nothing */
87      } else {
88        out[x]=in[i];
89        x++;
90      }
91    } else {
92      out[x]=in[i];
93      x++;
94    }
95  }
96  out[x]='\0';
97  return(out);
98}
99
100/* Break a command line up into argv, argc.  The caller must free
101   the returned values with g_strfreev.  If there is an error argc will be set
102   to -1, argv will be NULL and the caller does not need to free anything. The
103   returned vector is NULL-terminated. */
104char **owl_parseline(const char *line, int *argc)
105{
106  GPtrArray *argv;
107  int i, len, between=1;
108  GString *curarg;
109  char quote;
110
111  argv = g_ptr_array_new();
112  len=strlen(line);
113  curarg = g_string_new("");
114  quote='\0';
115  if (argc) *argc=0;
116  for (i=0; i<len+1; i++) {
117    /* find the first real character */
118    if (between) {
119      if (line[i]==' ' || line[i]=='\t' || line[i]=='\0') {
120        continue;
121      } else {
122        between=0;
123        i--;
124        continue;
125      }
126    }
127
128    /* deal with a quote character */
129    if (line[i]=='"' || line[i]=="'"[0]) {
130      /* if this type of quote is open, close it */
131      if (quote==line[i]) {
132        quote='\0';
133        continue;
134      }
135
136      /* if no quoting is open then open with this */
137      if (quote=='\0') {
138        quote=line[i];
139        continue;
140      }
141
142      /* if another type of quote is open then treat this as a literal */
143      g_string_append_c(curarg, line[i]);
144      continue;
145    }
146
147    /* if it's not a space or end of command, then use it */
148    if (line[i]!=' ' && line[i]!='\t' && line[i]!='\n' && line[i]!='\0') {
149      g_string_append_c(curarg, line[i]);
150      continue;
151    }
152
153    /* otherwise, if we're not in quotes, add the whole argument */
154    if (quote=='\0') {
155      /* add the argument */
156      g_ptr_array_add(argv, g_string_free(curarg, false));
157      curarg = g_string_new("");
158      between=1;
159      continue;
160    }
161
162    /* if it is a space and we're in quotes, then use it */
163    g_string_append_c(curarg, line[i]);
164  }
165
166  if (argc) *argc = argv->len;
167  g_ptr_array_add(argv, NULL);
168  g_string_free(curarg, true);
169
170  /* check for unbalanced quotes */
171  if (quote!='\0') {
172    /* TODO: when we move to requiring glib 2.22+, use
173     * g_ptr_array_new_with_free_func. */
174    g_ptr_array_foreach(argv, (GFunc)g_free, NULL);
175    g_ptr_array_free(argv, true);
176    if (argc) *argc = -1;
177    return(NULL);
178  }
179
180  return (char**)g_ptr_array_free(argv, false);
181}
182
183/* Appends a quoted version of arg suitable for placing in a
184 * command-line to a GString. Does not append a space. */
185void owl_string_append_quoted_arg(GString *buf, const char *arg)
186{
187  const char *argp;
188  if (arg[0] == '\0') {
189    /* Quote the empty string. */
190    g_string_append(buf, "''");
191  } else if (arg[strcspn(arg, "'\" \n\t")] == '\0') {
192    /* If there are no nasty characters, return as-is. */
193    g_string_append(buf, arg);
194  } else if (!strchr(arg, '\'')) {
195    /* Single-quote if possible. */
196    g_string_append_c(buf, '\'');
197    g_string_append(buf, arg);
198    g_string_append_c(buf, '\'');
199  } else {
200    /* Nasty case: double-quote, but change all internal "s to "'"'"
201     * so that they are single-quoted because we're too cool for
202     * backslashes.
203     */
204    g_string_append_c(buf, '"');
205    for (argp = arg; *argp; argp++) {
206      if (*argp == '"')
207        g_string_append(buf, "\"'\"'\"");
208      else
209        g_string_append_c(buf, *argp);
210    }
211    g_string_append_c(buf, '"');
212  }
213}
214
215/*
216 * Appends 'tmpl' to 'buf', replacing any instances of '%q' with arguments from
217 * the varargs provided, quoting them to be safe for placing in a barnowl
218 * command line.
219 */
220void owl_string_appendf_quoted(GString *buf, const char *tmpl, ...)
221{
222  va_list ap;
223  va_start(ap, tmpl);
224  owl_string_vappendf_quoted(buf, tmpl, ap);
225  va_end(ap);
226}
227
228void owl_string_vappendf_quoted(GString *buf, const char *tmpl, va_list ap)
229{
230  const char *p = tmpl, *last = tmpl;
231  while (true) {
232    p = strchr(p, '%');
233    if (p == NULL) break;
234    if (*(p+1) != 'q') {
235      p++;
236      if (*p) p++;
237      continue;
238    }
239    g_string_append_len(buf, last, p - last);
240    owl_string_append_quoted_arg(buf, va_arg(ap, char *));
241    p += 2; last = p;
242  }
243
244  g_string_append(buf, last);
245}
246
247char *owl_string_build_quoted(const char *tmpl, ...)
248{
249  GString *buf = g_string_new("");
250  va_list ap;
251  va_start(ap, tmpl);
252  owl_string_vappendf_quoted(buf, tmpl, ap);
253  va_end(ap);
254  return g_string_free(buf, false); 
255}
256
257/* Returns a quoted version of arg suitable for placing in a
258 * command-line. Result should be freed with g_free. */
259char *owl_arg_quote(const char *arg)
260{
261  GString *buf = g_string_new("");;
262  owl_string_append_quoted_arg(buf, arg);
263  return g_string_free(buf, false);
264}
265
266/* caller must free the return */
267char *owl_util_minutes_to_timestr(int in)
268{
269  int days, hours;
270  long run;
271  char *out;
272
273  run=in;
274
275  days=run/1440;
276  run-=days*1440;
277  hours=run/60;
278  run-=hours*60;
279
280  if (days>0) {
281    out=g_strdup_printf("%i d %2.2i:%2.2li", days, hours, run);
282  } else {
283    out=g_strdup_printf("    %2.2i:%2.2li", hours, run);
284  }
285  return(out);
286}
287
288/* These are in order of their value in owl.h */
289static const struct {
290  int number;
291  const char *name;
292} color_map[] = {
293  {OWL_COLOR_INVALID, "invalid"},
294  {OWL_COLOR_DEFAULT, "default"},
295  {OWL_COLOR_BLACK, "black"},
296  {OWL_COLOR_RED, "red"},
297  {OWL_COLOR_GREEN, "green"},
298  {OWL_COLOR_YELLOW,"yellow"},
299  {OWL_COLOR_BLUE, "blue"},
300  {OWL_COLOR_MAGENTA, "magenta"},
301  {OWL_COLOR_CYAN, "cyan"},
302  {OWL_COLOR_WHITE, "white"},
303};
304
305/* Return the owl color associated with the named color.  Return -1
306 * if the named color is not available
307 */
308int owl_util_string_to_color(const char *color)
309{
310  int c, i;
311  char *p;
312
313  for (i = 0; i < (sizeof(color_map)/sizeof(color_map[0])); i++)
314    if (strcasecmp(color, color_map[i].name) == 0)
315      return color_map[i].number;
316
317  c = strtol(color, &p, 10);
318  if (p != color && c >= -1 && c < COLORS) {
319    return(c);
320  }
321  return(OWL_COLOR_INVALID);
322}
323
324/* Return a string name of the given owl color */
325const char *owl_util_color_to_string(int color)
326{
327  if (color >= OWL_COLOR_INVALID && color <= OWL_COLOR_WHITE)
328    return color_map[color - OWL_COLOR_INVALID].name;
329  return("Unknown color");
330}
331
332/* Get the default tty name.  Caller must free the return */
333char *owl_util_get_default_tty(void)
334{
335  const char *tmp;
336  char *out;
337
338  if (getenv("DISPLAY")) {
339    out=g_strdup(getenv("DISPLAY"));
340  } else if ((tmp=ttyname(fileno(stdout)))!=NULL) {
341    out=g_strdup(tmp);
342    if (!strncmp(out, "/dev/", 5)) {
343      g_free(out);
344      out=g_strdup(tmp+5);
345    }
346  } else {
347    out=g_strdup("unknown");
348  }
349  return(out);
350}
351
352/* strip leading and trailing new lines.  Caller must free the
353 * return.
354 */
355char *owl_util_stripnewlines(const char *in)
356{
357 
358  char  *tmp, *ptr1, *ptr2, *out;
359
360  ptr1=tmp=g_strdup(in);
361  while (ptr1[0]=='\n') {
362    ptr1++;
363  }
364  ptr2=ptr1+strlen(ptr1)-1;
365  while (ptr2>ptr1 && ptr2[0]=='\n') {
366    ptr2[0]='\0';
367    ptr2--;
368  }
369
370  out=g_strdup(ptr1);
371  g_free(tmp);
372  return(out);
373}
374
375
376/* If filename is a link, recursively resolve symlinks.  Otherwise, return the filename
377 * unchanged.  On error, call owl_function_error and return NULL.
378 *
379 * This function assumes that filename eventually resolves to an acutal file.
380 * If you want to check this, you should stat() the file first.
381 *
382 * The caller of this function is responsible for freeing the return value.
383 *
384 * Error conditions are the same as g_file_read_link.
385 */
386gchar *owl_util_recursive_resolve_link(const char *filename)
387{
388  gchar *last_path = g_strdup(filename);
389  GError *err = NULL;
390
391  while (g_file_test(last_path, G_FILE_TEST_IS_SYMLINK)) {
392    gchar *link_path = g_file_read_link(last_path, &err);
393    if (link_path == NULL) {
394      owl_function_error("Cannot resolve symlink %s: %s",
395                         last_path, err->message);
396      g_error_free(err);
397      g_free(last_path);
398      return NULL;
399    }
400
401    /* Deal with obnoxious relative paths. If we really care, all this
402     * is racy. Whatever. */
403    if (!g_path_is_absolute(link_path)) {
404      char *last_dir = g_path_get_dirname(last_path);
405      char *tmp = g_build_path(G_DIR_SEPARATOR_S,
406                               last_dir,
407                               link_path,
408                               NULL);
409      g_free(last_dir);
410      g_free(link_path);
411      link_path = tmp;
412    }
413
414    g_free(last_path);
415    last_path = link_path;
416  }
417  return last_path;
418}
419
420/* Delete all lines matching "line" from the named file.  If no such
421 * line is found the file is left intact.  If backup==1 then leave a
422 * backup file containing the original contents.  The match is
423 * case-insensitive.
424 *
425 * Returns the number of lines removed on success.  Returns -1 on failure.
426 */
427int owl_util_file_deleteline(const char *filename, const char *line, int backup)
428{
429  char *backupfile, *newfile, *buf = NULL;
430  gchar *actual_filename; /* gchar; we need to g_free it */
431  FILE *old, *new;
432  struct stat st;
433  int numremoved = 0;
434
435  if ((old = fopen(filename, "r")) == NULL) {
436    owl_function_error("Cannot open %s (for reading): %s",
437                       filename, strerror(errno));
438    return -1;
439  }
440
441  if (fstat(fileno(old), &st) != 0) {
442    owl_function_error("Cannot stat %s: %s", filename, strerror(errno));
443    return -1;
444  }
445
446  /* resolve symlinks, because link() fails on symlinks, at least on AFS */
447  actual_filename = owl_util_recursive_resolve_link(filename);
448  if (actual_filename == NULL)
449    return -1; /* resolving the symlink failed, but we already logged this error */
450
451  newfile = g_strdup_printf("%s.new", actual_filename);
452  if ((new = fopen(newfile, "w")) == NULL) {
453    owl_function_error("Cannot open %s (for writing): %s",
454                       actual_filename, strerror(errno));
455    g_free(newfile);
456    fclose(old);
457    free(actual_filename);
458    return -1;
459  }
460
461  if (fchmod(fileno(new), st.st_mode & 0777) != 0) {
462    owl_function_error("Cannot set permissions on %s: %s",
463                       actual_filename, strerror(errno));
464    unlink(newfile);
465    fclose(new);
466    g_free(newfile);
467    fclose(old);
468    free(actual_filename);
469    return -1;
470  }
471
472  while (owl_getline_chomp(&buf, old))
473    if (strcasecmp(buf, line) != 0)
474      fprintf(new, "%s\n", buf);
475    else
476      numremoved++;
477  g_free(buf);
478
479  fclose(new);
480  fclose(old);
481
482  if (backup) {
483    backupfile = g_strdup_printf("%s.backup", actual_filename);
484    unlink(backupfile);
485    if (link(actual_filename, backupfile) != 0) {
486      owl_function_error("Cannot link %s: %s", backupfile, strerror(errno));
487      g_free(backupfile);
488      unlink(newfile);
489      g_free(newfile);
490      return -1;
491    }
492    g_free(backupfile);
493  }
494
495  if (rename(newfile, actual_filename) != 0) {
496    owl_function_error("Cannot move %s to %s: %s",
497                       newfile, actual_filename, strerror(errno));
498    numremoved = -1;
499  }
500
501  unlink(newfile);
502  g_free(newfile);
503
504  g_free(actual_filename);
505
506  return numremoved;
507}
508
509/* Return the base class or instance from a zephyr class, by removing
510   leading `un' or trailing `.d'.
511   The caller is responsible for freeing the allocated string.
512*/
513char * owl_util_baseclass(const char * class)
514{
515  char *start, *end;
516
517  while(!strncmp(class, "un", 2)) {
518    class += 2;
519  }
520
521  start = g_strdup(class);
522  end = start + strlen(start) - 1;
523  while(end > start && *end == 'd' && *(end-1) == '.') {
524    end -= 2;
525  }
526  *(end + 1) = 0;
527
528  return start;
529}
530
531const char * owl_get_datadir(void)
532{
533  const char * datadir = getenv("BARNOWL_DATA_DIR");
534  if(datadir != NULL)
535    return datadir;
536  return DATADIR;
537}
538
539const char * owl_get_bindir(void)
540{
541  const char * bindir = getenv("BARNOWL_BIN_DIR");
542  if(bindir != NULL)
543    return bindir;
544  return BINDIR;
545}
546
547/* Strips format characters from a valid utf-8 string. Returns the
548   empty string if 'in' does not validate. */
549char * owl_strip_format_chars(const char *in)
550{
551  char *r;
552  if (g_utf8_validate(in, -1, NULL)) {
553    const char *s, *p;
554    r = g_new(char, strlen(in)+1);
555    r[0] = '\0';
556    s = in;
557    p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
558    while(p) {
559      /* If it's a format character, copy up to it, and skip all
560         immediately following format characters. */
561      if (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
562        strncat(r, s, p-s);
563        p = g_utf8_next_char(p);
564        while (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
565          p = g_utf8_next_char(p);
566        }
567        s = p;
568        p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
569      }
570      else {
571        p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
572      }
573    }
574    if (s) strcat(r,s);
575  }
576  else {
577    r = g_strdup("");
578  }
579  return r;
580}
581
582/* If in is not UTF-8, convert from ISO-8859-1. We may want to allow
583 * the caller to specify an alternative in the future. We also strip
584 * out characters in Unicode Plane 16, as we use that plane internally
585 * for formatting.
586 */
587char * owl_validate_or_convert(const char *in)
588{
589  if (g_utf8_validate(in, -1, NULL)) {
590    return owl_strip_format_chars(in);
591  }
592  else {
593    return g_convert(in, -1,
594                     "UTF-8", "ISO-8859-1",
595                     NULL, NULL, NULL);
596  }
597}
598/*
599 * Validate 'in' as UTF-8, and either return a copy of it, or an empty
600 * string if it is invalid utf-8.
601 */
602char * owl_validate_utf8(const char *in)
603{
604  char *out;
605  if (g_utf8_validate(in, -1, NULL)) {
606    out = g_strdup(in);
607  } else {
608    out = g_strdup("");
609  }
610  return out;
611}
612
613/* This is based on _extract() and _isCJ() from perl's Text::WrapI18N */
614int owl_util_can_break_after(gunichar c)
615{
616 
617  if (c == ' ') return 1;
618  if (c >= 0x3000 && c <= 0x312f) {
619    /* CJK punctuations, Hiragana, Katakana, Bopomofo */
620    if (c == 0x300a || c == 0x300c || c == 0x300e ||
621        c == 0x3010 || c == 0x3014 || c == 0x3016 ||
622        c == 0x3018 || c == 0x301a)
623      return 0;
624    return 1;
625  }
626  if (c >= 0x31a0 && c <= 0x31bf) {return 1;}  /* Bopomofo */
627  if (c >= 0x31f0 && c <= 0x31ff) {return 1;}  /* Katakana extension */
628  if (c >= 0x3400 && c <= 0x9fff) {return 1;}  /* Han Ideogram */
629  if (c >= 0xf900 && c <= 0xfaff) {return 1;}  /* Han Ideogram */
630  if (c >= 0x20000 && c <= 0x2ffff) {return 1;}  /* Han Ideogram */
631  return 0;
632}
633
634char *owl_escape_highbit(const char *str)
635{
636  GString *out = g_string_new("");
637  unsigned char c;
638  while((c = (*str++))) {
639    if(c == '\\') {
640      g_string_append(out, "\\\\");
641    } else if(c & 0x80) {
642      g_string_append_printf(out, "\\x%02x", (int)c);
643    } else {
644      g_string_append_c(out, c);
645    }
646  }
647  return g_string_free(out, 0);
648}
649
650/* innards of owl_getline{,_chomp} below */
651static int owl_getline_internal(char **s, FILE *fp, int newline)
652{
653  int size = 0;
654  int target = 0;
655  int count = 0;
656  int c;
657
658  while (1) {
659    c = getc(fp);
660    if ((target + 1) > size) {
661      size += BUFSIZ;
662      *s = g_renew(char, *s, size);
663    }
664    if (c == EOF)
665      break;
666    count++;
667    if (c != '\n' || newline)
668        (*s)[target++] = c;
669    if (c == '\n')
670      break;
671  }
672  (*s)[target] = 0;
673
674  return count;
675}
676
677/* Read a line from fp, allocating memory to hold it, returning the number of
678 * byte read.  *s should either be NULL or a pointer to memory allocated with
679 * g_malloc; it will be g_renew'd as appropriate.  The caller must
680 * eventually free it.  (This is roughly the interface of getline in the gnu
681 * libc).
682 *
683 * The final newline will be included if it's there.
684 */
685int owl_getline(char **s, FILE *fp)
686{
687  return owl_getline_internal(s, fp, 1);
688}
689
690/* As above, but omitting the final newline */
691int owl_getline_chomp(char **s, FILE *fp)
692{
693  return owl_getline_internal(s, fp, 0);
694}
695
696/* Read the rest of the input available in fp into a string. */
697char *owl_slurp(FILE *fp)
698{
699  char *buf = NULL;
700  char *p;
701  int size = 0;
702  int count;
703
704  while (1) {
705    buf = g_renew(char, buf, size + BUFSIZ);
706    p = &buf[size];
707    size += BUFSIZ;
708
709    if ((count = fread(p, 1, BUFSIZ, fp)) < BUFSIZ)
710      break;
711  }
712  p[count] = 0;
713
714  return buf;
715}
716
717gulong owl_dirty_window_on_signal(owl_window *w, gpointer sender, const gchar *detailed_signal)
718{
719  return owl_signal_connect_object(sender, detailed_signal, G_CALLBACK(owl_window_dirty), w, G_CONNECT_SWAPPED);
720}
721
722typedef struct { /*noproto*/
723  GObject  *sender;
724  gulong    signal_id;
725} SignalData;
726
727static void _closure_invalidated(gpointer data, GClosure *closure);
728
729/*
730 * GObject's g_signal_connect_object has a documented bug. This function is
731 * identical except it does not leak the signal handler.
732 */
733gulong owl_signal_connect_object(gpointer sender, const gchar *detailed_signal, GCallback c_handler, gpointer receiver, GConnectFlags connect_flags)
734{
735  g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (sender), 0);
736  g_return_val_if_fail (detailed_signal != NULL, 0);
737  g_return_val_if_fail (c_handler != NULL, 0);
738
739  if (receiver) {
740    SignalData *sdata;
741    GClosure *closure;
742    gulong signal_id;
743
744    g_return_val_if_fail (G_IS_OBJECT (receiver), 0);
745
746    closure = ((connect_flags & G_CONNECT_SWAPPED) ? g_cclosure_new_object_swap : g_cclosure_new_object) (c_handler, receiver);
747    signal_id = g_signal_connect_closure (sender, detailed_signal, closure, connect_flags & G_CONNECT_AFTER);
748
749    /* Register the missing hooks */
750    sdata = g_slice_new0(SignalData);
751    sdata->sender = sender;
752    sdata->signal_id = signal_id;
753
754    g_closure_add_invalidate_notifier(closure, sdata, _closure_invalidated);
755
756    return signal_id;
757  } else {
758    return g_signal_connect_data(sender, detailed_signal, c_handler, NULL, NULL, connect_flags);
759  }
760}
761
762/*
763 * There are three ways the signal could come to an end:
764 *
765 * 1. The user explicitly disconnects it with the returned signal_id.
766 *    - In that case, the disconnection unref's the closure, causing it
767 *      to first be invalidated. The handler's already disconnected, so
768 *      we have no work to do.
769 * 2. The sender gets destroyed.
770 *    - GObject will disconnect each signal which then goes into the above
771 *      case. Our handler does no work.
772 * 3. The receiver gets destroyed.
773 *    - The GClosure was created by g_cclosure_new_object_{,swap} which gets
774 *      invalidated when the receiver is destroyed. We then follow through case 1
775 *      again, but *this* time, the handler has not been disconnected. We then
776 *      clean up ourselves.
777 *
778 * We can't actually hook into this process earlier with weakrefs as GObject
779 * will, on object dispose, first disconnect signals, then invalidate closures,
780 * and notify weakrefs last.
781 */
782static void _closure_invalidated(gpointer data, GClosure *closure)
783{
784  SignalData *sdata = data;
785  if (g_signal_handler_is_connected(sdata->sender, sdata->signal_id)) {
786    g_signal_handler_disconnect(sdata->sender, sdata->signal_id);
787  }
788  g_slice_free(SignalData, sdata);
789}
790
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