Add a MSVC / Windows compatible snprintf function (#7353)

Use sizeof where applicable for mt_snprintf

src/game.cpp

@@ -53,6 +53,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "nodedef.h"         // Needed for determining pointing to nodes
 #include "nodemetadata.h"
 #include "particles.h"
+#include "porting.h"
 #include "profiler.h"
 #include "quicktune_shortcutter.h"
 #include "raycast.h"
@@ -4028,7 +4029,7 @@ void Game::showPauseMenu()
 
 	 char control_text_buf[600];
 
-	 snprintf(control_text_buf, ARRLEN(control_text_buf), control_text_template.c_str(),
+	 porting::mt_snprintf(control_text_buf, sizeof(control_text_buf), control_text_template.c_str(),
 			GET_KEY_NAME(keymap_forward),
 			GET_KEY_NAME(keymap_backward),
 			GET_KEY_NAME(keymap_left),

src/gui/guiConfirmRegistration.cpp

@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <IGUIStaticText.h>
 #include <IGUIFont.h>
 #include "intlGUIEditBox.h"
+#include "porting.h"
 
 #include "gettext.h"
 
@@ -96,8 +97,9 @@ void GUIConfirmRegistration::regenerateGui(v2u32 screensize)
 				"Join to confirm account creation or click Cancel to "
 				"abort.");
 		char info_text_buf[1024];
-		snprintf(info_text_buf, sizeof(info_text_buf), info_text_template.c_str(),
-				address.c_str(), m_playername.c_str());
+		porting::mt_snprintf(info_text_buf, sizeof(info_text_buf),
+				info_text_template.c_str(), address.c_str(),
+				m_playername.c_str());
 
 		wchar_t *info_text_buf_wide = utf8_to_wide_c(info_text_buf);
 		gui::IGUIEditBox *e = new gui::intlGUIEditBox(info_text_buf_wide, true,

src/gui/profilergraph.cpp

@@ -18,6 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#include "porting.h"
 #include "profilergraph.h"
 #include "util/string.h"
 
@@ -95,12 +96,12 @@ void ProfilerGraph::draw(s32 x_left, s32 y_bottom, video::IVideoDriver *driver,
 
 		s32 texth = 15;
 		char buf[10];
-		snprintf(buf, 10, "%.3g", show_max);
+		porting::mt_snprintf(buf, sizeof(buf), "%.3g", show_max);
 		font->draw(utf8_to_wide(buf).c_str(),
 				core::rect<s32>(textx, y - graphh, textx2,
 						y - graphh + texth),
 				meta.color);
-		snprintf(buf, 10, "%.3g", show_min);
+		porting::mt_snprintf(buf, sizeof(buf), "%.3g", show_min);
 		font->draw(utf8_to_wide(buf).c_str(),
 				core::rect<s32>(textx, y - texth, textx2, y), meta.color);
 		font->draw(utf8_to_wide(id).c_str(),

src/guiscalingfilter.cpp

@@ -18,6 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "guiscalingfilter.h"
 #include "imagefilters.h"
+#include "porting.h"
 #include "settings.h"
 #include "util/numeric.h"
 #include <cstdio>
@@ -78,7 +79,7 @@ video::ITexture *guiScalingResizeCached(video::IVideoDriver *driver,
 
 	// Calculate scaled texture name.
 	char rectstr[200];
-	snprintf(rectstr, sizeof(rectstr), "%d:%d:%d:%d:%d:%d",
+	porting::mt_snprintf(rectstr, sizeof(rectstr), "%d:%d:%d:%d:%d:%d",
 		srcrect.UpperLeftCorner.X,
 		srcrect.UpperLeftCorner.Y,
 		srcrect.getWidth(),

src/map.cpp

@@ -1727,13 +1727,13 @@ std::string ServerMap::getSectorDir(v2s16 pos, int layout)
 	switch(layout)
 	{
 		case 1:
-			snprintf(cc, 9, "%.4x%.4x",
+			porting::mt_snprintf(cc, sizeof(cc), "%.4x%.4x",
 				(unsigned int) pos.X & 0xffff,
 				(unsigned int) pos.Y & 0xffff);
 
 			return m_savedir + DIR_DELIM + "sectors" + DIR_DELIM + cc;
 		case 2:
-			snprintf(cc, 9, (std::string("%.3x") + DIR_DELIM + "%.3x").c_str(),
+			porting::mt_snprintf(cc, sizeof(cc), (std::string("%.3x") + DIR_DELIM + "%.3x").c_str(),
 				(unsigned int) pos.X & 0xfff,
 				(unsigned int) pos.Y & 0xfff);
 
@@ -1791,7 +1791,7 @@ v3s16 ServerMap::getBlockPos(const std::string &sectordir, const std::string &bl
 std::string ServerMap::getBlockFilename(v3s16 p)
 {
 	char cc[5];
-	snprintf(cc, 5, "%.4x", (unsigned int)p.Y&0xffff);
+	porting::mt_snprintf(cc, sizeof(cc), "%.4x", (unsigned int)p.Y&0xffff);
 	return cc;
 }
 

src/mapblock.cpp

@@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef SERVER
 #include "mapblock_mesh.h"
 #endif
+#include "porting.h"
 #include "util/string.h"
 #include "util/serialize.h"
 #include "util/basic_macros.h"
@@ -797,7 +798,7 @@ std::string analyze_block(MapBlock *block)
 
 	v3s16 p = block->getPos();
 	char spos[25];
-	snprintf(spos, sizeof(spos), "(%2d,%2d,%2d), ", p.X, p.Y, p.Z);
+	porting::mt_snprintf(spos, sizeof(spos), "(%2d,%2d,%2d), ", p.X, p.Y, p.Z);
 	desc<<spos;
 
 	switch(block->getModified())

src/porting.cpp

@@ -50,6 +50,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/string.h"
 #include "settings.h"
 #include <list>
+#include <cstdarg>
+#include <cstdio>
 
 namespace porting
 {
@@ -661,6 +663,28 @@ void attachOrCreateConsole()
 #endif
 }
 
+int mt_snprintf(char *buf, const size_t buf_size, const char *fmt, ...)
+{
+	// https://msdn.microsoft.com/en-us/library/bt7tawza.aspx
+	//  Many of the MSVC / Windows printf-style functions do not support positional
+	//  arguments (eg. "%1$s"). We just forward the call to vsnprintf for sane
+	//  platforms, but defer to _vsprintf_p on MSVC / Windows.
+	// https://github.com/FFmpeg/FFmpeg/blob/5ae9fa13f5ac640bec113120d540f70971aa635d/compat/msvcrt/snprintf.c#L46
+	//  _vsprintf_p has to be shimmed with _vscprintf_p on -1 (for an example see
+	//  above FFmpeg link).
+	va_list args;
+	va_start(args, fmt);
+#ifndef _MSC_VER
+	int c = vsnprintf(buf, buf_size, fmt, args);
+#else  // _MSC_VER
+	int c = _vsprintf_p(buf, buf_size, fmt, args);
+	if (c == -1)
+		c = _vscprintf_p(fmt, args);
+#endif // _MSC_VER
+	va_end(args);
+	return c;
+}
+
 // Load performance counter frequency only once at startup
 #ifdef _WIN32
 

src/porting.h

@@ -327,6 +327,8 @@ bool secure_rand_fill_buf(void *buf, size_t len);
 
 // This attaches to the parents process console, or creates a new one if it doesnt exist.
 void attachOrCreateConsole();
+
+int mt_snprintf(char *buf, const size_t buf_size, const char *fmt, ...);
 } // namespace porting
 
 #ifdef __ANDROID__

src/script/common/c_internal.cpp

@@ -20,6 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "common/c_internal.h"
 #include "debug.h"
 #include "log.h"
+#include "porting.h"
 #include "settings.h"
 
 std::string script_get_backtrace(lua_State *L)
@@ -82,7 +83,7 @@ void script_error(lua_State *L, int pcall_result, const char *mod, const char *f
 		err_descr = "<no description>";
 
 	char buf[256];
-	snprintf(buf, sizeof(buf), "%s error from mod '%s' in callback %s(): ",
+	porting::mt_snprintf(buf, sizeof(buf), "%s error from mod '%s' in callback %s(): ",
 		err_type, mod, fxn);
 
 	std::string err_msg(buf);

src/script/cpp_api/s_base.cpp

@@ -293,7 +293,7 @@ void ScriptApiBase::stackDump(std::ostream &o)
 				break;
 			case LUA_TNUMBER:  /* numbers */ {
 				char buf[10];
-				snprintf(buf, 10, "%lf", lua_tonumber(m_luastack, i));
+				porting::mt_snprintf(buf, sizeof(buf), "%lf", lua_tonumber(m_luastack, i));
 				o << buf;
 				break;
 			}

src/serverenvironment.cpp

@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "nodemetadata.h"
 #include "gamedef.h"
 #include "map.h"
+#include "porting.h"
 #include "profiler.h"
 #include "raycast.h"
 #include "remoteplayer.h"
@@ -1860,9 +1861,9 @@ static void print_hexdump(std::ostream &o, const std::string &data)
 			int i = i0 + di;
 			char buf[4];
 			if(di<thislinelength)
-				snprintf(buf, 4, "%.2x ", data[i]);
+				porting::mt_snprintf(buf, sizeof(buf), "%.2x ", data[i]);
 			else
-				snprintf(buf, 4, "   ");
+				porting::mt_snprintf(buf, sizeof(buf), "   ");
 			o<<buf;
 		}
 		o<<" ";

src/unittest/test.cpp

@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "modchannels.h"
 #include "content/mods.h"
 #include "util/numeric.h"
+#include "porting.h"
 
 content_t t_CONTENT_STONE;
 content_t t_CONTENT_GRASS;
@@ -323,7 +324,7 @@ std::string TestBase::getTestTempDirectory()
 		return m_test_dir;
 
 	char buf[32];
-	snprintf(buf, sizeof(buf), "%08X", myrand());
+	porting::mt_snprintf(buf, sizeof(buf), "%08X", myrand());
 
 	m_test_dir = fs::TempPath() + DIR_DELIM "mttest_" + buf;
 	if (!fs::CreateDir(m_test_dir))
@@ -335,7 +336,7 @@ std::string TestBase::getTestTempDirectory()
 std::string TestBase::getTestTempFile()
 {
 	char buf[32];
-	snprintf(buf, sizeof(buf), "%08X", myrand());
+	porting::mt_snprintf(buf, sizeof(buf), "%08X", myrand());
 
 	return getTestTempDirectory() + DIR_DELIM + buf + ".tmp";
 }

src/unittest/test_connection.cpp

@@ -20,6 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "test.h"
 
 #include "log.h"
+#include "porting.h"
 #include "settings.h"
 #include "util/serialize.h"
 #include "network/connection.h"
@@ -280,7 +281,7 @@ void TestConnection::testConnectSendReceive()
 			if (i % 2 == 0)
 				infostream << " ";
 			char buf[10];
-			snprintf(buf, 10, "%.2X",
+			porting::mt_snprintf(buf, sizeof(buf), "%.2X",
 				((int)((const char *)pkt.getU8Ptr(0))[i]) & 0xff);
 			infostream<<buf;
 		}
@@ -323,7 +324,7 @@ void TestConnection::testConnectSendReceive()
 			if (i % 2 == 0)
 				infostream << " ";
 			char buf[10];
-			snprintf(buf, 10, "%.2X", ((int)(recvdata[i])) & 0xff);
+			porting::mt_snprintf(buf, sizeof(buf), "%.2X", ((int)(recvdata[i])) & 0xff);
 			infostream << buf;
 		}
 		if (size > 20)