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-rw-r--r--util/log.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/util/log.c b/util/log.c
new file mode 100644
index 0000000..4a22354
--- /dev/null
+++ b/util/log.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2021 SUSE LLC
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This file implements basic logging functionality.
+ */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <time.h>
+#define LOG_FUNCNAME 1
+#include "log.h"
+#include "cleanup.h"
+
+#ifndef LOG_CLOCK
+#define LOG_CLOCK CLOCK_MONOTONIC
+#endif
+
+int log_level = DEFAULT_LOGLEVEL;
+bool log_timestamp;
+bool log_pid;
+
+void __attribute__((format(printf, 3, 4)))
+__msg(int lvl, const char *func, const char *format, ...)
+{
+ va_list ap;
+ char pidbuf[16];
+ char timebuf[32];
+ static const char *const formats[] = {
+ "%s%s%s",
+ "%s%s%s: ",
+ "%s<%s>%s ",
+ "%s<%s> %s: ",
+ "[%s] %s%s ",
+ "[%s]%s %s: ",
+ "[%s] <%s>%s ",
+ "[%s] <%s> %s: ",
+ };
+ char *header __cleanup__(cleanup_charp) = NULL;
+ char *message __cleanup__(cleanup_charp) = NULL;
+ int idx;
+
+ if (lvl > log_level)
+ return;
+
+ if (log_timestamp) {
+ struct timespec now;
+
+ clock_gettime(LOG_CLOCK, &now);
+ snprintf(timebuf, sizeof(timebuf), "%6ld.%06ld",
+ (long)now.tv_sec, now.tv_nsec / 1000);
+ } else
+ *timebuf = '\0';
+
+ if (log_pid)
+ snprintf(pidbuf, sizeof(pidbuf), "%ld", (long)getpid());
+ else
+ *pidbuf = '\0';
+
+ idx = ((log_timestamp ? 1 : 0) << 2) |
+ ((log_pid ? 1 : 0) << 1) | (func ? 1 : 0);
+
+ if (asprintf(&header, formats[idx], timebuf, pidbuf, func ? func : "")
+ == -1)
+ header = NULL;
+
+ va_start(ap, format);
+ if (vasprintf(&message, format, ap) == -1)
+ message = NULL;
+ va_end(ap);
+
+ fprintf(stderr, "%s%s", header ? header : "<error>",
+ message ? message : "<error>");
+
+}