libcrystfel plumbing to allow ERROR/STATUS messages in GUI

1 files changed, 46 insertions, 0 deletions

diff --git a/libcrystfel/src/utils.c b/libcrystfel/src/utils.c
index 0c01c069..694e76bc 100644
--- a/libcrystfel/src/utils.c
+++ b/libcrystfel/src/utils.c
@@ -720,3 +720,49 @@ char *load_entire_file(const char *filename)
 
 	return contents;
 }
+
+
+/* ------------------------------ Message logging ---------------------------- */
+
+/* Lock to keep lines serialised on the terminal */
+pthread_mutex_t stderr_lock = PTHREAD_MUTEX_INITIALIZER;
+
+
+static void log_to_stderr(enum log_msg_type type, const char *msg)
+{
+	int error_print_val = get_status_label();
+	pthread_mutex_lock(&stderr_lock);
+	if ( error_print_val >= 0 ) {
+		fprintf(stderr, "%3i: ", error_print_val);
+	}
+	fprintf(stderr, "%s", msg);
+	pthread_mutex_unlock(&stderr_lock);
+}
+
+
+/* Function to call with ERROR/STATUS messages */
+void (*log_msg_func)(enum log_msg_type type, const char *) = log_to_stderr;
+
+
+void set_log_message_func(void (*new_log_msg_func)(enum log_msg_type type, const char *))
+{
+	log_msg_func = new_log_msg_func;
+}
+
+
+void STATUS(const char *format, ...)
+{
+	va_list args;
+	char tmp[1024];
+	vsnprintf(tmp, 1024, format, args);
+	log_msg_func(LOG_MSG_STATUS, tmp);
+}
+
+
+void ERROR(const char *format, ...)
+{
+	va_list args;
+	char tmp[1024];
+	vsnprintf(tmp, 1024, format, args);
+	log_msg_func(LOG_MSG_ERROR, tmp);
+}