scanadf.c: implement dedicated exit function to prevent SIGSEGV

src/scanadf.c

@@ -126,6 +126,8 @@ static int resolution_opt = -1, x_resolution_opt = -1, y_resolution_opt = -1;
 static SANE_Word window_val[2];
 static int window_val_user[2];	/* is width/height user-specified? */
 
+static void scanadf_exit (int);
+
 static const char usage[] = "Usage: %s [OPTION]...\n\
 \n\
 Start image acquisition on a scanner device and write image data to\n\
@@ -381,7 +383,7 @@ parse_scalar (const SANE_Option_Descriptor * opt, const char * str,
       fprintf (stderr,
 	       "%s: option --%s: bad option value (rest of option: %s)\n",
 	       prog_name, opt->name, str);
-      exit (1);
+      scanadf_exit (1);
     }
   str = end;
 
@@ -482,7 +484,7 @@ parse_vector (const SANE_Option_Descriptor * opt, const char * str,
 	  {
 	    fprintf (stderr, "%s: option --%s: closing bracket missing "
 		     "(rest of option: %s)\n", prog_name, opt->name, str);
-	    exit (1);
+	    scanadf_exit (1);
 	  }
 	str = end + 1;
       }
@@ -493,20 +495,20 @@ parse_vector (const SANE_Option_Descriptor * opt, const char * str,
       {
 	fprintf (stderr, "%s: option --%s: index %d out of range [0..%ld]\n",
 		 prog_name, opt->name, index, (long) vector_length - 1);
-	exit (1);
+	scanadf_exit (1);
       }
 
     /* read value */
     str = parse_scalar (opt, str, &value);
     if (!str)
-      exit (1);
+      scanadf_exit (1);
 
     if (*str && *str != '-' && *str != ',')
       {
 	fprintf (stderr,
 		 "%s: option --%s: illegal separator (rest of option: %s)\n",
 		 prog_name, opt->name, str);
-	exit (1);
+	scanadf_exit (1);
       }
 
     /* store value: */
@@ -672,6 +674,28 @@ fetch_options (SANE_Device * device)
     }
 }
 
+static void
+scanadf_exit (int status)
+{
+  if (device)
+    {
+      if (verbose > 1)
+	fprintf (stderr, "Closing device\n");
+      sane_close (device);
+    }
+  if (verbose > 1)
+    fprintf (stderr, "Calling sane_exit\n");
+  sane_exit ();
+
+  if (all_options)
+    free (all_options);
+  if (option_number)
+    free (option_number);
+  if (verbose > 1)
+    fprintf (stderr, "scanimage: finished\n");
+  exit (status);
+}
+
 static void
 set_option (SANE_Handle device, int optnum, void * valuep)
 {
@@ -691,7 +715,7 @@ set_option (SANE_Handle device, int optnum, void * valuep)
     {
       fprintf (stderr, "%s: setting of option --%s failed (%s)\n",
 	       prog_name, opt->name, sane_strstatus (status));
-      exit (1);
+      scanadf_exit (1);
     }
 
   if ((info & SANE_INFO_INEXACT) && opt->size == sizeof (SANE_Word))
@@ -726,7 +750,7 @@ process_backend_option (SANE_Handle device, int optnum, const char * optarg)
     {
       fprintf (stderr, "%s: attempted to set inactive option %s\n",
 	       prog_name, opt->name);
-      exit (1);
+      scanadf_exit (1);
     }
 
   if ((opt->cap & SANE_CAP_AUTOMATIC) && strncasecmp (optarg, "auto", 4) == 0)
@@ -737,7 +761,7 @@ process_backend_option (SANE_Handle device, int optnum, const char * optarg)
 	{
 	  fprintf (stderr, "%s: failed to set option --%s to automatic (%s)\n",
 		   prog_name, opt->name, sane_strstatus (status));
-	  exit (1);
+	  scanadf_exit (1);
 	}
       return;
     }
@@ -757,7 +781,7 @@ process_backend_option (SANE_Handle device, int optnum, const char * optarg)
 	    {
 	      fprintf (stderr, "%s: option --%s: bad option value `%s'\n",
 		       prog_name, opt->name, optarg);
-	      exit (1);
+	      scanadf_exit (1);
 	    }
 	}
       break;
@@ -773,7 +797,7 @@ process_backend_option (SANE_Handle device, int optnum, const char * optarg)
 	  if (!vector)
 	    {
 	      fprintf (stderr, "%s: out of memory\n", prog_name);
-	      exit (1);
+	      scanadf_exit (1);
 	    }
 	}
       parse_vector (opt, optarg, vector, vector_length);
@@ -1439,12 +1463,12 @@ main (int argc, char **argv)
 	{
 	  fprintf (stderr, "%s: sane_get_devices() failed: %s\n",
 		   prog_name, sane_strstatus (status));
-	  exit (1);
+	  scanadf_exit (1);
 	}
       if (!device_list[0])
 	{
 	  fprintf (stderr, "%s: no SANE devices found\n", prog_name);
-	  exit (1);
+	  scanadf_exit (1);
 	}
       devname = device_list[0]->name;
     }
@@ -1457,7 +1481,7 @@ main (int argc, char **argv)
       if (help)
 	device = 0;
       else
-	exit (1);
+	scanadf_exit (1);
     }
 
   if (device)
@@ -1469,7 +1493,7 @@ main (int argc, char **argv)
 	{
 	  fprintf (stderr, "%s: unable to determine option count\n",
 		   prog_name);
-	  exit (1);
+	  scanadf_exit (1);
 	}
 
       all_options_len = num_dev_options + NELEMS(basic_options) + 1;
@@ -1480,7 +1504,7 @@ main (int argc, char **argv)
 	{
 	  fprintf (stderr, "%s: out of memory in fetch_options()\n",
 		   prog_name);
-	  exit (1);
+	  scanadf_exit (1);
 	}
 
       fetch_options (device);
@@ -1510,7 +1534,7 @@ main (int argc, char **argv)
 	if (!full_optstring)
 	  {
 	    fprintf (stderr, "%s: out of memory\n", prog_name);
-	    exit (1);
+	    scanadf_exit (1);
 	  }
 
 	strcpy (full_optstring, BASE_OPTSTRING);
@@ -1530,7 +1554,7 @@ main (int argc, char **argv)
 	    {
 	    case ':':
 	    case '?':
-	      exit (1);	/* error message is printed by getopt_long() */
+	      scanadf_exit (1);	/* error message is printed by getopt_long() */
 
 	    case 'd': case 'h': case 'v': case 'V': case 'T':
 	    case 'o': case 'S': case 's': case 'e': case 'p': case 'r':
@@ -1639,7 +1663,7 @@ List of available devices:", prog_name);
 	    }
 	}
       fputc ('\n', stdout);
-      exit (0);
+      scanadf_exit (0);
     }
 
   signal (SIGHUP,  sighandler);