Display proof-of-work hash when one is discovered

miner.h

@@ -27,6 +27,21 @@ static inline uint32_t swab32(uint32_t v)
 	return __builtin_bswap32(v);
 }
 
+static inline void swap256(void *dest_p, const void *src_p)
+{
+	uint32_t *dest = dest_p;
+	const uint32_t *src = src_p;
+
+	dest[0] = src[7];
+	dest[1] = src[6];
+	dest[2] = src[5];
+	dest[3] = src[4];
+	dest[4] = src[3];
+	dest[5] = src[2];
+	dest[6] = src[1];
+	dest[7] = src[0];
+}
+
 extern bool opt_debug;
 extern bool opt_protocol;
 extern const uint32_t sha256_init_state[];
@@ -55,4 +70,6 @@ extern bool scanhash_asm32(const unsigned char *midstate,unsigned char *data,
 extern int
 timeval_subtract (struct timeval *result, struct timeval *x, struct timeval *y);
 
+extern void print_pow(const unsigned char *hash);
+
 #endif /* __MINER_H__ */

sha256_4way.c

@@ -123,6 +123,9 @@ unsigned int ScanHash_4WaySSE2(const unsigned char *pmidstate, unsigned char *pd
 
                 for (i = 0; i < 32/4; i++)
                     ((unsigned int*)phash)[i] = thash[i][j];
+
+		print_pow(phash);
+
 		*nHashesDone = nonce;
 		*nNonce_p = nonce + j;
                 return nonce + j;

sha256_cryptopp.c

@@ -110,13 +110,7 @@ bool scanhash_cryptopp(const unsigned char *midstate, unsigned char *data,
 		stat_ctr++;
 
 		if (hash32[7] == 0) {
-			char *hexstr;
-
-			hexstr = bin2hex(hash, 32);
-			fprintf(stderr,
-				"DBG: found zeroes in hash:\n%s\n",
-				hexstr);
-			free(hexstr);
+			print_pow(hash);
 
 			*hashes_done = stat_ctr;
 			return true;
@@ -601,13 +595,7 @@ bool scanhash_asm32(const unsigned char *midstate, unsigned char *data,
 		stat_ctr++;
 
 		if (hash32[7] == 0) {
-			char *hexstr;
-
-			hexstr = bin2hex(hash, 32);
-			fprintf(stderr,
-				"DBG: found zeroes in hash:\n%s\n",
-				hexstr);
-			free(hexstr);
+			print_pow(hash);
 
 			*hashes_done = stat_ctr;
 			return true;

sha256_generic.c

@@ -256,13 +256,7 @@ bool scanhash_c(const unsigned char *midstate, unsigned char *data,
 		stat_ctr++;
 
 		if (hash32[7] == 0) {
-			char *hexstr;
-
-			hexstr = bin2hex(hash, 32);
-			fprintf(stderr,
-				"DBG: found zeroes in hash:\n%s\n",
-				hexstr);
-			free(hexstr);
+			print_pow(hash);
 
 			*hashes_done = stat_ctr;
 			return true;

sha256_via.c

@@ -57,13 +57,7 @@ bool scanhash_via(unsigned char *data_inout,
 		stat_ctr++;
 
 		if (hash32[7] == 0) {
-			char *hexstr;
-
-			hexstr = bin2hex(tmp_hash, 32);
-			fprintf(stderr,
-				"DBG: found zeroes in hash:\n%s\n",
-				hexstr);
-			free(hexstr);
+			print_pow(tmp_hash);
 
 			/* swap nonce'd data back into original storage area;
 			 * TODO: only swap back the nonce, rather than all data

util.c

@@ -255,3 +255,14 @@ timeval_subtract (
   return x->tv_sec < y->tv_sec;
 }
 
+void print_pow(const unsigned char *hash)
+{
+	char *hexstr;
+	unsigned char hash_swap[32];
+
+	swap256(hash_swap, hash);
+	hexstr = bin2hex(hash_swap, 32);
+	fprintf(stderr, "PoW found: %s\n", hexstr);
+	free(hexstr);
+}
+