Move string_printf to maxbase

Can be used in tests.

server/core/utils.cc

@@ -1229,34 +1229,6 @@ uint8_t* set_byteN(uint8_t* ptr, uint64_t value, int bytes)
     return ptr + bytes;
 }
 
-std::string string_printf(const char* format, ...)
-{
-    /* Use 'vsnprintf' for the formatted printing. It outputs the optimal buffer length - 1. */
-    va_list args;
-    va_start(args, format);
-    int characters = vsnprintf(NULL, 0, format, args);
-    va_end(args);
-    std::string rval;
-    if (characters < 0)
-    {
-        // Encoding (programmer) error.
-        mxb_assert(!true);
-        MXS_ERROR("Could not format the string %s.", format);
-    }
-    else if (characters > 0)
-    {
-        // 'characters' does not include the \0-byte.
-        int total_size = characters + 1;
-        rval.reserve(total_size);
-        rval.resize(characters);    // The final "length" of the string
-        va_start(args, format);
-        // Write directly to the string internal array, avoiding any temporary arrays.
-        vsnprintf(&rval[0], total_size, format, args);
-        va_end(args);
-    }
-    return rval;
-}
-
 namespace
 {
 

server/modules/monitor/mariadbmon/cluster_discovery.cc

@@ -12,16 +12,16 @@
  */
 
 #include "mariadbmon.hh"
-
+#include <algorithm>
 #include <inttypes.h>
 #include <string>
 #include <queue>
+#include <maxbase/format.hh>
 #include <maxscale/modutil.h>
 #include <maxscale/mysql_utils.h>
-#include <maxscale/utils.hh>
 
 using std::string;
-using maxscale::string_printf;
+using maxbase::string_printf;
 
 namespace
 {

server/modules/monitor/mariadbmon/cluster_manipulation.cc

@@ -12,18 +12,18 @@
  */
 
 #include "mariadbmon.hh"
-
+#include <algorithm>
 #include <inttypes.h>
 #include <set>
 #include <sstream>
 #include <maxbase/stopwatch.hh>
+#include <maxbase/format.hh>
 #include <maxscale/clock.h>
 #include <maxscale/mysql_utils.h>
-#include <maxscale/utils.hh>
 
 using std::string;
 using std::unique_ptr;
-using maxscale::string_printf;
+using maxbase::string_printf;
 using maxbase::StopWatch;
 using maxbase::Duration;
 

server/modules/monitor/mariadbmon/mariadbmon.cc

@@ -19,18 +19,19 @@
 #include <inttypes.h>
 #include <sstream>
 #include <maxbase/assert.h>
+#include <maxbase/format.hh>
 #include <maxscale/alloc.h>
 #include <maxscale/dcb.h>
 #include <maxscale/modulecmd.h>
 #include <maxscale/mysql_utils.h>
 #include <maxscale/routingworker.h>
 #include <maxscale/secrets.h>
-#include <maxscale/utils.hh>
+#include <maxscale/utils.h>
 // TODO: For monitor_add_parameters
 #include "../../../core/internal/monitor.h"
 
 using std::string;
-using maxscale::string_printf;
+using maxbase::string_printf;
 
 // Config parameter names
 const char* const CN_AUTO_FAILOVER = "auto_failover";
@@ -278,7 +279,6 @@ void MariaDBMonitor::diagnostics(DCB* dcb) const
 
 string MariaDBMonitor::diagnostics_to_string() const
 {
-    using maxscale::string_printf;
     string rval;
     rval += string_printf("Automatic failover:     %s\n", m_auto_failover ? "Enabled" : "Disabled");
     rval += string_printf("Failcount:              %d\n", m_failcount);

server/modules/monitor/mariadbmon/mariadbserver.cc

@@ -17,12 +17,13 @@
 #include <inttypes.h>
 #include <iomanip>
 #include <thread>
-#include <maxscale/mysql_utils.h>
-#include <maxscale/utils.hh>
 #include <set>
+#include <maxbase/format.hh>
+#include <maxscale/mysql_utils.h>
+
 
 using std::string;
-using maxscale::string_printf;
+using maxbase::string_printf;
 using maxbase::Duration;
 using maxbase::StopWatch;
 

server/modules/monitor/mariadbmon/server_utils.cc

@@ -14,11 +14,12 @@
 
 #include <algorithm>
 #include <inttypes.h>
+#include <maxbase/format.hh>
 #include <maxbase/assert.h>
-#include <maxscale/utils.hh>
+
 
 using std::string;
-using maxscale::string_printf;
+using maxbase::string_printf;
 
 namespace
 {