allow formatted messages

4 files changed, 24 insertions, 0 deletions

diff --git a/common/nslog_log.hpp b/common/nslog_log.hpp
index d4ea6f6eaa..9f2f3aee7b 100644
--- a/common/nslog_log.hpp
+++ b/common/nslog_log.hpp
@@ -10,6 +10,7 @@ public:
     inline ~NSLogBackend() = default;
 
     void record(EventSeverity severity, Event event, const std::string &msg);
+    void record(EventSeverity severity, Event event, const char* format, ...);
     void record(EventSeverity severity, Event event, int64_t code);
     void record(EventSeverity severity, Event event, int64_t code, const std::string &msg);
 };
diff --git a/common/nslog_log.mm b/common/nslog_log.mm
index eed0810aee..ad685ea8dc 100644
--- a/common/nslog_log.mm
+++ b/common/nslog_log.mm
@@ -11,6 +11,19 @@ void NSLogBackend::record(EventSeverity severity, Event event, const std::string
                                  encoding:NSUTF8StringEncoding]);
 }
 
+
+void NSLogBackend::record(EventSeverity severity, Event event, const char* format, ...) {
+    va_list args;
+    va_start(args, format);
+    const int len = vsnprintf(NULL, 0, format, args);
+    va_end(args);
+    std::unique_ptr<char[]> buffer(new char[len + 1]);
+    va_start(args, format);
+    vsnprintf(buffer.get(), len + 1, format, args);
+    va_end(args);
+    NSLog(@"[%s] %s: %s", stringifyEventSeverity(severity), stringifyEvent(event), buffer.get());
+}
+
 void NSLogBackend::record(EventSeverity severity, Event event, int64_t code) {
     NSLog(@"[%s] %s: (%lld)", stringifyEventSeverity(severity), stringifyEvent(event), code);
 }
diff --git a/common/stderr_log.cpp b/common/stderr_log.cpp
index b3b1fea333..18ad9b3f10 100644
--- a/common/stderr_log.cpp
+++ b/common/stderr_log.cpp
@@ -8,6 +8,15 @@ void StderrLogBackend::record(EventSeverity severity, Event event, const std::st
     std::cerr << "[" << severity << "] " << event << ": " << msg << std::endl;
 }
 
+void StderrLogBackend::record(EventSeverity severity, Event event, const char* format, ...) {
+    std::cerr << "[" << severity << "] " << event << ": ";
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+    std::cerr << std::endl;
+}
+
 void StderrLogBackend::record(EventSeverity severity, Event event, int64_t code) {
     std::cerr << "[" << severity << "] " << event << ": (" << code << ")" << std::endl;
 }
diff --git a/common/stderr_log.hpp b/common/stderr_log.hpp
index 32b6850cb7..e2492d3af5 100644
--- a/common/stderr_log.hpp
+++ b/common/stderr_log.hpp
@@ -10,6 +10,7 @@ public:
     inline ~StderrLogBackend() = default;
 
     void record(EventSeverity severity, Event event, const std::string &msg);
+    void record(EventSeverity severity, Event event, const char* format, ...);
     void record(EventSeverity severity, Event event, int64_t code);
     void record(EventSeverity severity, Event event, int64_t code, const std::string &msg);
 };