changelog entry for genesys build 83

ChangeLog

@@ -1,17 +1,17 @@
+2012-06-01 Stéphane Voltz <stef.dev@free.fr>
 2012-05-31 Stéphane Voltz <stef.dev@free.fr>
-	*  doc/descriptions/genesys.desc doc/sane-genesys.man
-	doc/descriptions/unsupported.desc: updated Xerox onetouch 2400 status
-	to supported
+	* backend/genesys.c: fix get_device to handle scanner plugging and
+	unplugging
 
 2012-05-29 Stéphane Voltz <stef.dev@free.fr>
-	*  backend/genesys.c backend/genesys_devices.c backend/genesys_gl847.c
+	* backend/genesys.c backend/genesys_devices.c backend/genesys_gl847.c
 	backend/genesys_gl847.h doc/descriptions/genesys.desc: add 4800 dpi
 	for LiDE 700F
 	- improve fedd/move to scan area for gl847 based scanners
 	- remove non working 400 dpi mode
 
 2012-05-28 Stéphane Voltz <stef.dev@free.fr>
-	*  backend/genesys.c backend/genesys_devices.c backend/genesys_gl124.c
+	* backend/genesys.c backend/genesys_devices.c backend/genesys_gl124.c
 	backend/genesys_gl847.c backend/genesys_gl847.h backend/genesys_low.h
 	doc/descriptions/genesys.desc doc/sane-genesys.man: 
 	add support for LiDE 700F up to 2400 dpi

backend/genesys.c

@@ -58,7 +58,7 @@
  * SANE backend for Genesys Logic GL646/GL841/GL842/GL843/GL847/GL124 based scanners
  */
 
-#define BUILD 82
+#define BUILD 83
 #define BACKEND_NAME genesys
 
 #include "genesys.h"
@@ -6578,13 +6578,17 @@ sane_exit (void)
 SANE_Status
 sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
 {
-  Genesys_Device *dev;
-  SANE_Int dev_num;
+  Genesys_Device *dev, *prev;
+  SANE_Status status;
+  SANE_Int index;
+  SANE_Int dn;
+  SANE_Device *sane_device;
 
   DBG (DBG_proc, "sane_get_devices: start: local_only = %s\n",
        local_only == SANE_TRUE ? "true" : "false");
 
   /* hot-plug case :detection of newly connected scanners */
+  sanei_usb_init();
   probe_genesys_devices ();
 
   if (devlist)
@@ -6594,21 +6598,66 @@ sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
   if (!devlist)
     return SANE_STATUS_NO_MEM;
 
-  dev_num = 0;
-  for (dev = first_dev; dev_num < num_devices; dev = dev->next)
+  prev = NULL;
+  index = 0;
+  dev = first_dev;
+  while(dev!=NULL)
     {
-      SANE_Device *sane_device;
+      /* check if device removed */
+      status = sanei_usb_open (dev->file_name, &dn);
+      if(status==SANE_STATUS_GOOD)
+        {
+          sanei_usb_close(dn);
+          sane_device = malloc (sizeof (*sane_device));
+          if (!sane_device)
+            return SANE_STATUS_NO_MEM;
+          sane_device->name = dev->file_name;
+          sane_device->vendor = dev->model->vendor;
+          sane_device->model = dev->model->model;
+          sane_device->type = strdup ("flatbed scanner");
+          devlist[index] = sane_device;
+          index++;
+          prev=dev;
+          dev=dev->next;
+        }
+      else
+        {
+          /* remove device from internal list */
+          /* case 1 : removed device is first_dev */
+          if(prev==NULL)
+            {
+              /* test for another dev */
+              if(dev->next==NULL)
+                {
+                  /* empty the whole list */
+                  free(dev);
+                  first_dev=NULL;
+                  num_devices=0;
+                  dev=NULL;
+                }
+              else
+                {
+                  /* assign new start */
+                  first_dev=dev->next;
+                  num_devices--;
+                  free(dev);
+                  dev=dev->next;
+                }
+            }
+          /* case 2 : removed device is not first_dev */
+          else
+            {
+              /* link previous dev to next dev */
+              prev->next=dev->next;
+              free(dev);
+              num_devices--;
 
-      sane_device = malloc (sizeof (*sane_device));
-      if (!sane_device)
-	return SANE_STATUS_NO_MEM;
-      sane_device->name = dev->file_name;
-      sane_device->vendor = dev->model->vendor;
-      sane_device->model = dev->model->model;
-      sane_device->type = strdup ("flatbed scanner");
-      devlist[dev_num++] = sane_device;
+              /* next loop */
+              dev=prev->next;
+            }
+        }
     }
-  devlist[dev_num++] = 0;
+  devlist[index] = 0;
 
   *device_list = devlist;