add minimal logging framework

Makefile

@@ -1,7 +1,7 @@
 CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter
 LIBS=-lrt
 
-COMMON=name.o util.o set.o hashmap.o strv.o job.o manager.o conf-parser.o load-fragment.o socket-util.c
+COMMON=name.o util.o set.o hashmap.o strv.o job.o manager.o conf-parser.o load-fragment.o socket-util.o log.o
 
 all: systemd test-engine
 

log.c

@@ -0,0 +1,38 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "log.h"
+
+void log_meta(
+        int level,
+        const char*file,
+        int line,
+        const char *func,
+        const char *format, ...) {
+
+        const char *prefix, *suffix;
+        va_list ap;
+
+        if (LOG_PRI(level) <= LOG_ERR) {
+                prefix = "\x1B[1;31m";
+                suffix = "\x1B[0m";
+        } else {
+                prefix = "";
+                suffix = "";
+        }
+
+        va_start(ap, format);
+
+        fprintf(stderr, "(%s:%u) %s", file, line, prefix);
+        vfprintf(stderr, format, ap);
+        fprintf(stderr, "%s\n", suffix);
+
+        va_end(ap);
+
+}

log.h

@@ -0,0 +1,23 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#ifndef foologhfoo
+#define foologhfoo
+
+#include <syslog.h>
+
+#include "macro.h"
+
+void log_meta(
+        int level,
+        const char*file,
+        int line,
+        const char *func,
+        const char *format, ...) __printf_attr(5,6);
+
+#define log_debug(...)   log_meta(LOG_DEBUG,   __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define log_info(...)    log_meta(LOG_INFO,    __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define log_notice(...)  log_meta(LOG_NOTICE,  __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define log_warning(...) log_meta(LOG_WARNING, __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define log_error(...)   log_meta(LOG_ERR,     __FILE__, __LINE__, __func__, __VA_ARGS__)
+
+#endif