svn commit: trunk/uClibc/libc/inet

vapier at uclibc.org vapier at uclibc.org
Fri Jan 6 04:08:02 UTC 2006


Author: vapier
Date: 2006-01-05 20:08:00 -0800 (Thu, 05 Jan 2006)
New Revision: 13123

Log:
rework the alloca() loop slightly to save some space

Modified:
   trunk/uClibc/libc/inet/if_index.c


Changeset:
Modified: trunk/uClibc/libc/inet/if_index.c
===================================================================
--- trunk/uClibc/libc/inet/if_index.c	2006-01-06 03:28:21 UTC (rev 13122)
+++ trunk/uClibc/libc/inet/if_index.c	2006-01-06 04:08:00 UTC (rev 13123)
@@ -101,21 +101,19 @@
   rq_len = RQ_IFS * sizeof (struct ifreq);
 
   /* Read all the interfaces out of the kernel.  */
-  ifc.ifc_buf = alloca (rq_len);
-  ifc.ifc_len = rq_len;
-  while (1)
+  /* Note: alloca's in this loop are diff from glibc because it's smaller */
+  do
     {
+      ifc.ifc_buf = extend_alloca (ifc.ifc_buf, rq_len, 2 * rq_len);
+      ifc.ifc_len = rq_len;
+
       if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0)
 	{
 	  __close (fd);
 	  return NULL;
 	}
-      if (ifc.ifc_len < rq_len)
-	break;
-
-      ifc.ifc_buf = extend_alloca (ifc.ifc_buf, rq_len, 2 * rq_len);
-      ifc.ifc_len = rq_len;
     }
+  while (ifc.ifc_len == rq_len);
 
   nifs = ifc.ifc_len / sizeof(struct ifreq);
 




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