From 71e9ec887c8043b4263e87a937c2c260cf1a9b5a Mon Sep 17 00:00:00 2001
From: erdgeist <>
Date: Mon, 12 Nov 2007 16:54:21 +0000
Subject: Some in code documentation to make Denis happy :)

---
 ot_fullscrape.c | 42 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 37 insertions(+), 5 deletions(-)

(limited to 'ot_fullscrape.c')

diff --git a/ot_fullscrape.c b/ot_fullscrape.c
index 0571049..052777a 100644
--- a/ot_fullscrape.c
+++ b/ot_fullscrape.c
@@ -25,43 +25,75 @@
 
 size_t return_fullscrape_for_tracker( int *iovec_entries, struct iovec **iovector ) {
   int    bucket;
-  size_t j;
   char  *r, *re;
 
+  /* Setup return vector */
   *iovec_entries = 0;
   if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) )
     return 0;
+
+  /* ... and pointer end of current output buffer
+     this works as a low watermark */
   re = r + OT_SCRAPE_CHUNK_SIZE;
 
+  /* Start reply dictionary */
   memmove( r, "d5:filesd", 9 ); r += 9;
+
+  /* For each bucket... */
   for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
+    /* Get exclusive access to that bucket */
     ot_vector *torrents_list = mutex_bucket_lock( bucket );
-    for( j=0; j<torrents_list->size; ++j ) {
-      ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[j] ).peer_list;
-      ot_hash     *hash      =&( ((ot_torrent*)(torrents_list->data))[j] ).hash;
+    size_t tor_offset;
+
+    /* For each torrent in this bucket.. */
+    for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
+      /* Address torrents members */
+      ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
+      ot_hash     *hash      =&( ((ot_torrent*)(torrents_list->data))[tor_offset] ).hash;
+
+      /* If torrent has peers or download count, its interesting */
       if( peer_list->peer_count || peer_list->down_count ) {
+
+        /* push hash as bencoded string */
         *r++='2'; *r++='0'; *r++=':';
         memmove( r, hash, 20 ); r+=20;
+
+        /* push rest of the scrape string */
         r += sprintf( r, "d8:completei%zde10:downloadedi%zde10:incompletei%zdee", peer_list->seed_count, peer_list->down_count, peer_list->peer_count-peer_list->seed_count );
       }
 
+      /* If we reached our low watermark in buffer... */
       if( re - r <= OT_FULLSCRAPE_MAXENTRYLEN ) {
+
+        /* crop current output buffer to the amount really used */
         iovec_fixlast( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE - ( re - r ) );
+        
+        /* And allocate a fresh output buffer at the end of our buffers list */
         if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) ) {
+        
+          /* If this fails: free buffers */
           iovec_free( iovec_entries, iovector );
+
+          /* Release lock on current bucket and return */
           mutex_bucket_unlock( bucket );
           return 0;
         }
+        
+        /* Adjust new end of output buffer */
         re = r + OT_SCRAPE_CHUNK_SIZE;
       }
-        
     }
+    
+    /* All torrents done: release lock on currenct bucket */
     mutex_bucket_unlock( bucket );
   }
 
+  /* Close bencoded scrape dictionary */
   *r++='e'; *r++='e';
 
+  /* Release unused memory in current output buffer */
   iovec_fixlast( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE - ( re - r ) );
 
+  /* Return answer size */
   return iovec_length( iovec_entries, iovector );
 }
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