port: EterBase/Debug.cpp log functions verbatim (log.txt, syserr.txt)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/port/port_debug_log_test.cpp

@@ -0,0 +1,73 @@
+// EterBase/Debug.cpp (the 40250 non-_DEBUG build): OpenLogFile sends stderr to syserr.txt and, with true,
+// opens log.txt for Log*/Trace*; SetLogLevel filters Log*. Its own process because stderr is redirected, so
+// failures go to stdout.
+#include "EterBase/StdAfx.h"
+#include "EterBase/Debug.h"
+
+#include <cstdio>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <unistd.h>
+
+static int g_failures = 0;
+#define CHECK(cond)                                                    \
+	do {                                                               \
+		if (!(cond)) {                                                 \
+			std::printf("%s:%d: CHECK(%s)\n", __FILE__, __LINE__, #cond); \
+			++g_failures;                                              \
+		}                                                              \
+	} while (0)
+
+static std::string ReadAll(const char* path)
+{
+	std::ifstream in(path);
+	std::stringstream ss;
+	ss << in.rdbuf();
+	return ss.str();
+}
+
+int main()
+{
+	char dir[] = "/tmp/mt_debuglog_XXXXXX";
+	if (!mkdtemp(dir) || chdir(dir) != 0)
+		return 1;
+
+	// Before OpenLogFile nothing reaches a log file.
+	Tracenf("before %d", 1);
+
+	OpenLogFile(true);
+	SetLogLevel(1);
+	Logn(0, "level0");
+	Logn(1, "level1");
+	Lognf(2, "lognf %d", 2);
+	Logf(0, "logf-filtered");
+	Tracen("tracen");
+	Tracef("tracef %s\n", "x");
+	TraceError("oops %d", 7);
+	LogFilef("filef %d\n", 3);
+	fflush(stderr);
+
+	const std::string log = ReadAll("log.txt");
+	const std::string syserr = ReadAll("syserr.txt");
+	CHECK(log.find("before") == std::string::npos);
+	CHECK(log.find("level0") == std::string::npos);
+	CHECK(log.find(" :: level1") != std::string::npos);
+	CHECK(log.find(" :: lognf 2\n") != std::string::npos);
+	CHECK(log.find("logf-filtered") == std::string::npos);
+	CHECK(log.find(" :: tracen") != std::string::npos);
+	CHECK(log.find(" :: tracef x\n") != std::string::npos);
+	CHECK(log.find(" :: SYSERR: oops 7\n") != std::string::npos);
+	CHECK(log.find(" :: filef 3\n") != std::string::npos);
+	CHECK(syserr.find(" :: oops 7\n") != std::string::npos && syserr.find("SYSERR") == std::string::npos);
+
+	unlink("log.txt");
+	unlink("syserr.txt");
+	chdir("/");
+	rmdir(dir);
+	if (g_failures)
+		std::printf("port_debug_log_test: %d failure(s)\n", g_failures);
+	else
+		std::puts("port_debug_log_test: ok");
+	return g_failures ? 1 : 0;
+}