show-coindiff option added

sgminer.c

@@ -102,6 +102,7 @@ algorithm_t *opt_algorithm;
 static const bool opt_time = true;
 unsigned long long global_hashrate;
 unsigned long global_quota_gcd = 1;
+bool opt_show_coindiff = false;
 time_t last_getwork;
 
 int nDevs;
@@ -1484,6 +1485,9 @@ static struct opt_table opt_config_table[] = {
   OPT_WITH_ARG("--socks-proxy",
       opt_set_charp, NULL, &opt_socks_proxy,
       "Set socks4 proxy (host:port)"),
+  OPT_WITHOUT_ARG("--show-coindiff",
+      opt_set_bool, &opt_show_coindiff,
+      "Show coin difficulty rather than hash value of a share"),
   OPT_WITH_ARG("--state",
       set_pool_state, NULL, NULL,
       "Specify pool state at startup (default: enabled)"),
@@ -1939,6 +1943,16 @@ static void update_gbt(struct pool *pool)
   curl_easy_cleanup(curl);
 }
 
+/* Return the work coin/network difficulty */
+static double get_work_coindiff(const struct work *work)
+{
+  uint8_t pow = work->data[72];
+  int powdiff = (8 * (0x1d - 3)) - (8 * (pow - 3));
+  uint32_t diff32 = be32toh(*((uint32_t *)(work->data + 72))) & 0x00FFFFFF;
+  double numerator = 0xFFFFULL << powdiff;
+  return numerator / (double)diff32;
+}
+
 static void gen_gbt_work(struct pool *pool, struct work *work)
 {
   unsigned char *merkleroot;
@@ -2787,6 +2801,12 @@ static void show_hash(struct work *work, char *hashshow)
   uint32_t *hash32;
   int ofs;
 
+  suffix_string_double(work->share_diff, diffdisp, sizeof (diffdisp), 0);
+  suffix_string_double(work->work_difficulty, wdiffdisp, sizeof (wdiffdisp), 0);
+  if (opt_show_coindiff) {
+    snprintf(hashshow, 64, "Coin %.0f Diff %s/%s%s", get_work_coindiff(work), diffdisp, wdiffdisp,
+     work->block? " BLOCK!" : "");
+  } else {
     swab256(rhash, work->hash);
     for (ofs = 0; ofs <= 28; ofs ++) {
       if (rhash[ofs])
@@ -2794,11 +2814,11 @@ static void show_hash(struct work *work, char *hashshow)
     }
     hash32 = (uint32_t *)(rhash + ofs);
     h32 = be32toh(*hash32);
-  suffix_string_double(work->share_diff, diffdisp, sizeof (diffdisp), 0);
+    
-  suffix_string_double(work->work_difficulty, wdiffdisp, sizeof (wdiffdisp), 0);
     snprintf(hashshow, 64, "%08lx Diff %s/%s%s", h32, diffdisp, wdiffdisp,
        work->block ? " BLOCK!" : "");
   }
+}
 
 #ifdef HAVE_LIBCURL
 static void text_print_status(int thr_id)