X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=log.cpp;fp=log.cpp;h=ba05a64d1fe5236c4dfe370a947254587c56cf37;hp=0000000000000000000000000000000000000000;hb=d1ad2cf60ca694f742e2061a596bc27c7e58f5c8;hpb=03569c70282f68a4bc9b259fbf5b7a2b4c5594b3

diff --git a/log.cpp b/log.cpp
new file mode 100644
index 0000000..ba05a64
--- /dev/null
+++ b/log.cpp
@@ -0,0 +1,112 @@
+#include "log.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include <assert.h>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+// Yes, it's a bit ugly.
+#define SYSLOG_FAKE_FILE (static_cast<FILE *>(NULL))
+
+bool logging_started = false;
+std::vector<FILE *> log_destinations;
+
+void add_log_destination_file(const std::string &filename)
+{
+	FILE *fp = fopen(filename.c_str(), "a");
+	if (fp == NULL) {
+		perror(filename.c_str());
+		return;
+	}
+
+	log_destinations.push_back(fp);	
+}
+
+void add_log_destination_console()
+{
+	log_destinations.push_back(stderr);
+}
+
+void add_log_destination_syslog()
+{
+	openlog("cubemap", LOG_PID, LOG_DAEMON);
+	log_destinations.push_back(SYSLOG_FAKE_FILE);
+}
+
+void start_logging()
+{
+	logging_started = true;
+}
+
+void shut_down_logging()
+{
+	for (size_t i = 0; i < log_destinations.size(); ++i) {
+		if (log_destinations[i] == SYSLOG_FAKE_FILE) {
+			closelog();
+		} else if (log_destinations[i] != stderr) {
+			if (fclose(log_destinations[i]) != 0) {
+				perror("fclose");
+			}
+		}
+	}
+	log_destinations.clear();
+	logging_started = false;
+}
+
+void log(LogLevel log_level, const char *fmt, ...)
+{
+	char formatted_msg[4096];
+	va_list ap;
+	va_start(ap, fmt);
+	vsnprintf(formatted_msg, sizeof(formatted_msg), fmt, ap);
+	va_end(ap);
+
+	const char *log_level_str;
+	int syslog_level;
+
+	switch (log_level) {
+	case NO_LEVEL:
+		log_level_str = "";
+		syslog_level = LOG_INFO;
+		break;
+	case INFO:
+		log_level_str = "INFO: ";
+		syslog_level = LOG_INFO;
+		break;
+	case WARNING:
+		log_level_str = "WARNING: ";
+		syslog_level = LOG_WARNING;
+		break;
+	case ERROR:
+		log_level_str = "ERROR: ";
+		syslog_level = LOG_ERR;
+		break;
+	default:
+		assert(false);
+	}
+
+	// Log to stderr if logging hasn't been set up yet. Note that this means
+	// that such messages will come even if there are no “error_log” lines.
+	if (!logging_started) {
+		fprintf(stderr, "%s%s\n", log_level_str, formatted_msg);
+		return;
+	}
+
+	for (size_t i = 0; i < log_destinations.size(); ++i) {
+                if (log_destinations[i] == SYSLOG_FAKE_FILE) {
+			syslog(syslog_level, "%s", formatted_msg);
+		} else {
+			int err = fprintf(log_destinations[i], "%s%s\n", log_level_str, formatted_msg);
+			if (err < 0) {
+				perror("fprintf");
+			}
+			if (log_destinations[i] != stderr) {
+				fflush(log_destinations[i]);
+			}
+		}
+	}
+}