Merge bitcoin/bitcoin#22859: Replace uses of boost::trim* with locale-independent alternatives (#18130 rebased)

696c76d6604c9c4faddfc4b6684e2788bb577ba6 tests: Add TrimString(...) tests (practicalswift)
4bf18b089e1bb1f3ab513cbdf6674bd1074f4621 Replace use of boost::trim_right with locale-independent TrimString (Ben Woosley)
93551862a18965bcee0c883c54807e8726e2f50f Replace use of boost::trim use with locale-independent TrimString (Ben Woosley)

Pull request description:

  This is [#18130 rebased](https://github.com/bitcoin/bitcoin/pull/18130#issuecomment-900158759).

  > `TrimString` is an existing alternative.

  > Note `TrimString` uses `" \f\n\r\t\v"` as the pattern, which is consistent with the default behavior of `std::isspace`. See: https://en.cppreference.com/w/cpp/string/byte/isspace

ACKs for top commit:
  jb55:
    utACK 696c76d6604c9c4faddfc4b6684e2788bb577ba6
  practicalswift:
    ACK 696c76d6604c9c4faddfc4b6684e2788bb577ba6
  jonatack:
    ACK 696c76d6604c9c4faddfc4b6684e2788bb577ba6
  theStack:
    Code-review ACK 696c76d6604c9c4faddfc4b6684e2788bb577ba6

Tree-SHA512: 6a70e3777602dfa65a60353e5c6874eb951e4a806844cd4bdaa4237cad980a4f61ec205defc05a29f9707776835975838f6cc635259c42adfe37ceb02ba9358d

3 files changed, 20 insertions, 6 deletions

diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index cd2cdf01f2..58c51bd8e0 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -772,9 +772,7 @@ static std::string readStdin()
     if (ferror(stdin))
         throw std::runtime_error("error reading stdin");
 
-    boost::algorithm::trim_right(ret);
-
-    return ret;
+    return TrimString(ret);
 }
 
 static int CommandLineRawTx(int argc, char* argv[])
diff --git a/src/httprpc.cpp b/src/httprpc.cpp
index e11e4acb5c..9ae592be79 100644
--- a/src/httprpc.cpp
+++ b/src/httprpc.cpp
@@ -10,6 +10,7 @@
 #include <rpc/protocol.h>
 #include <rpc/server.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/system.h>
 #include <util/translation.h>
 #include <walletinitinterface.h>
@@ -22,7 +23,7 @@
 #include <set>
 #include <string>
 
-#include <boost/algorithm/string.hpp> // boost::trim
+#include <boost/algorithm/string.hpp>
 
 /** WWW-Authenticate to present with 401 Unauthorized response */
 static const char* WWW_AUTH_HEADER_DATA = "Basic realm=\"jsonrpc\"";
@@ -130,8 +131,7 @@ static bool RPCAuthorized(const std::string& strAuth, std::string& strAuthUserna
         return false;
     if (strAuth.substr(0, 6) != "Basic ")
         return false;
-    std::string strUserPass64 = strAuth.substr(6);
-    boost::trim(strUserPass64);
+    std::string strUserPass64 = TrimString(strAuth.substr(6));
     std::string strUserPass = DecodeBase64(strUserPass64);
 
     if (strUserPass.find(':') != std::string::npos)
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 4f9d10cf1d..a62abf9b9c 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -173,6 +173,22 @@ BOOST_AUTO_TEST_CASE(util_Join)
     BOOST_CHECK_EQUAL(Join<std::string>({"foo", "bar"}, ", ", op_upper), "FOO, BAR");
 }
 
+BOOST_AUTO_TEST_CASE(util_TrimString)
+{
+    BOOST_CHECK_EQUAL(TrimString(" foo bar "), "foo bar");
+    BOOST_CHECK_EQUAL(TrimString("\t \n  \n \f\n\r\t\v\tfoo \n \f\n\r\t\v\tbar\t  \n \f\n\r\t\v\t\n "), "foo \n \f\n\r\t\v\tbar");
+    BOOST_CHECK_EQUAL(TrimString("\t \n foo \n\tbar\t \n "), "foo \n\tbar");
+    BOOST_CHECK_EQUAL(TrimString("\t \n foo \n\tbar\t \n ", "fobar"), "\t \n foo \n\tbar\t \n ");
+    BOOST_CHECK_EQUAL(TrimString("foo bar"), "foo bar");
+    BOOST_CHECK_EQUAL(TrimString("foo bar", "fobar"), " ");
+    BOOST_CHECK_EQUAL(TrimString(std::string("\0 foo \0 ", 8)), std::string("\0 foo \0", 7));
+    BOOST_CHECK_EQUAL(TrimString(std::string(" foo ", 5)), std::string("foo", 3));
+    BOOST_CHECK_EQUAL(TrimString(std::string("\t\t\0\0\n\n", 6)), std::string("\0\0", 2));
+    BOOST_CHECK_EQUAL(TrimString(std::string("\x05\x04\x03\x02\x01\x00", 6)), std::string("\x05\x04\x03\x02\x01\x00", 6));
+    BOOST_CHECK_EQUAL(TrimString(std::string("\x05\x04\x03\x02\x01\x00", 6), std::string("\x05\x04\x03\x02\x01", 5)), std::string("\0", 1));
+    BOOST_CHECK_EQUAL(TrimString(std::string("\x05\x04\x03\x02\x01\x00", 6), std::string("\x05\x04\x03\x02\x01\x00", 6)), "");
+}
+
 BOOST_AUTO_TEST_CASE(util_FormatParseISO8601DateTime)
 {
     BOOST_CHECK_EQUAL(FormatISO8601DateTime(1317425777), "2011-09-30T23:36:17Z");