1 files changed, 77 insertions, 0 deletions
diff --git a/util/log.c b/util/log.c
new file mode 100644
index 00000000..760ef18a
--- /dev/null
+++ b/util/log.c
@@ -0,0 +1,77 @@
+#define _POSIX_C_SOURCE 1
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <wlr/util/log.h>
+
+static bool colored = true;
+
+static const char *verbosity_colors[] = {
+	[L_SILENT] = "",
+	[L_ERROR ] = "\x1B[1;31m",
+	[L_INFO  ] = "\x1B[1;34m",
+	[L_DEBUG ] = "\x1B[1;30m",
+};
+
+void wlr_log_stderr(log_importance_t verbosity, const char *fmt, va_list args) {
+	// prefix the time to the log message
+	struct tm result;
+	time_t t = time(NULL);
+	struct tm *tm_info = localtime_r(&t, &result);
+	char buffer[26];
+
+	// generate time prefix
+	strftime(buffer, sizeof(buffer), "%F %T - ", tm_info);
+	fprintf(stderr, "%s", buffer);
+
+	unsigned c = (verbosity < L_LAST) ? verbosity : L_LAST - 1;
+
+	if (colored && isatty(STDERR_FILENO)) {
+		fprintf(stderr, "%s", verbosity_colors[c]);
+	}
+
+	vfprintf(stderr, fmt, args);
+
+	if (colored && isatty(STDERR_FILENO)) {
+		fprintf(stderr, "\x1B[0m");
+	}
+	fprintf(stderr, "\n");
+}
+
+static log_callback_t log_callback = wlr_log_stderr;
+
+void wlr_log_init(log_callback_t callback) {
+	log_callback = callback;
+}
+
+void _wlr_vlog(log_importance_t verbosity, const char *fmt, va_list args) {
+	log_callback(verbosity, fmt, args);
+}
+
+void _wlr_log(log_importance_t verbosity, const char *fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	log_callback(verbosity, fmt, args);
+	va_end(args);
+}
+
+// strips the path prefix from filepath
+// will try to strip WLR_SRC_DIR as well as a relative src dir
+// e.g. '/src/build/wlroots/backend/wayland/backend.c' and
+// '../backend/wayland/backend.c' will both be stripped to
+// 'backend/wayland/backend.c'
+const char *_strip_path(const char *filepath) {
+	static int srclen = strlen(WLR_SRC_DIR) + 1;
+	if(*filepath == '.') {
+		while(*filepath == '.' || *filepath == '/') {
+			++filepath;
+		}
+	} else {
+		filepath += srclen;
+	}
+	return filepath;
+}