vppinfra: add clib_file_get_resolved_basename

more generic version of clib_sysfs_link_to_name with support for
format strings...

Type: improvement
Change-Id: I0cb263748970378c661415196eb7e08450370677
Signed-off-by: Damjan Marion <damarion@cisco.com>

3 files changed, 8 insertions, 17 deletions

diff --git a/src/vlib/linux/pci.c b/src/vlib/linux/pci.c
index e94fee1bcbd..9661827ea0d 100644
--- a/src/vlib/linux/pci.c
+++ b/src/vlib/linux/pci.c
@@ -293,16 +293,13 @@ vlib_pci_get_device_info (vlib_main_t * vm, vlib_pci_addr_t * addr,
     goto error;
   di->revision = tmp;
 
-  vec_reset_length (f);
-  f = format (f, "%v/driver%c", dev_dir_name, 0);
-  di->driver_name = clib_sysfs_link_to_name ((char *) f);
+  di->driver_name =
+    clib_file_get_resolved_basename ("%v/driver", dev_dir_name);
   if (!di->driver_name)
     di->driver_name = format (0, "<NONE>%c", 0);
 
   di->iommu_group = -1;
-  vec_reset_length (f);
-  f = format (f, "%v/iommu_group%c", dev_dir_name, 0);
-  tmpstr = clib_sysfs_link_to_name ((char *) f);
+  tmpstr = clib_file_get_resolved_basename ("%v/iommu_group", dev_dir_name);
   if (tmpstr)
     {
       di->iommu_group = atoi ((char *) tmpstr);
@@ -506,9 +503,7 @@ vlib_pci_bind_to_uio (vlib_main_t *vm, vlib_pci_addr_t *addr,
 	}
     }
 
-  s = format (s, "%v/driver%c", dev_dir_name, 0);
-  driver_name = clib_sysfs_link_to_name ((char *) s);
-  vec_reset_length (s);
+  driver_name = clib_file_get_resolved_basename ("%v/driver", dev_dir_name);
 
   if (driver_name &&
       ((strcmp ("vfio-pci", (char *) driver_name) == 0) ||
diff --git a/src/vlib/linux/vfio.c b/src/vlib/linux/vfio.c
index dc68c52db02..ee04081d767 100644
--- a/src/vlib/linux/vfio.c
+++ b/src/vlib/linux/vfio.c
@@ -185,10 +185,8 @@ linux_vfio_group_get_device_fd (vlib_pci_addr_t * addr, int *fdp,
   int fd;
 
   *is_noiommu = 0;
-  s =
-    format (s, "/sys/bus/pci/devices/%U/iommu_group%c", format_vlib_pci_addr,
-	    addr, 0);
-  tmpstr = clib_sysfs_link_to_name ((char *) s);
+  tmpstr = clib_file_get_resolved_basename (
+    "/sys/bus/pci/devices/%U/iommu_group", format_vlib_pci_addr, addr);
   if (tmpstr)
     {
       iommu_group = atoi ((char *) tmpstr);
diff --git a/src/vlib/linux/vmbus.c b/src/vlib/linux/vmbus.c
index aae11a1fefb..b0663819a45 100644
--- a/src/vlib/linux/vmbus.c
+++ b/src/vlib/linux/vmbus.c
@@ -253,16 +253,14 @@ vlib_vmbus_bind_to_uio (vlib_vmbus_addr_t * addr)
   static int uio_new_id_needed = 1;
   struct dirent *e;
   struct ifreq ifr;
-  u8 *s, *driver_name;
+  u8 *s = 0, *driver_name;
   DIR *dir;
   int fd;
 
   dev_dir_name = format (0, "%s/%U", sysfs_vmbus_dev_path,
 			 format_vlib_vmbus_addr, addr);
-  s = format (0, "%v/driver%c", dev_dir_name, 0);
 
-  driver_name = clib_sysfs_link_to_name ((char *) s);
-  vec_reset_length (s);
+  driver_name = clib_file_get_resolved_basename ("%v/driver", dev_dir_name);
 
   /* skip if not using the Linux kernel netvsc driver */
   if (!driver_name || strcmp ("hv_netvsc", (char *) driver_name) != 0)