bitcoin-tx: Accept input via stdin. Add input handling to tests.

src/bitcoin-tx.cpp

@@ -13,6 +13,7 @@
 
 #include <stdio.h>
 #include <boost/assign/list_of.hpp>
+#include <boost/algorithm/string.hpp>
 
 using namespace std;
 using namespace boost::assign;
@@ -501,13 +502,34 @@ static void OutputTx(const CTransaction& tx)
         OutputTxHex(tx);
 }
 
+static string readStdin()
+{
+    char buf[4096];
+    string ret;
+
+    while (!feof(stdin)) {
+        size_t bread = fread(buf, 1, sizeof(buf), stdin);
+        ret.append(buf, bread);
+        if (bread < sizeof(buf))
+            break;
+    }
+
+    if (ferror(stdin))
+        throw runtime_error("error reading stdin");
+
+    boost::algorithm::trim_right(ret);
+
+    return ret;
+}
+
 static int CommandLineRawTx(int argc, char* argv[])
 {
     string strPrint;
     int nRet = 0;
     try {
-        // Skip switches
-        while (argc > 1 && IsSwitchChar(argv[1][0])) {
+        // Skip switches; Permit common stdin convention "-"
+        while (argc > 1 && IsSwitchChar(argv[1][0]) &&
+               (argv[1][1] != 0)) {
             argc--;
             argv++;
         }
@@ -522,6 +544,8 @@ static int CommandLineRawTx(int argc, char* argv[])
 
             // param: hex-encoded bitcoin transaction
             string strHexTx(argv[1]);
+            if (strHexTx == "-")                 // "-" implies standard input
+                strHexTx = readStdin();
 
             if (!DecodeHexTx(txDecodeTmp, strHexTx))
                 throw runtime_error("invalid transaction encoding");