Add mg_log_set_fn(), MG_ENABLE_LOG

src/config.h

@@ -1,5 +1,9 @@
 #pragma once
 
+#ifndef MG_ENABLE_LOG
+#define MG_ENABLE_LOG 1
+#endif
+
 #ifndef MG_ENABLE_MIP
 #define MG_ENABLE_MIP 0
 #endif
@@ -102,7 +106,3 @@
 #define MG_ENABLE_FILE 0
 #endif
 #endif
-
-#ifndef MG_PUTCHAR
-#define MG_PUTCHAR(x) putchar(x)
-#endif

src/log.c

@@ -1,10 +1,19 @@
 #include "log.h"
 #include "util.h"
 
+static void default_logger(unsigned char c) {
+  putchar(c);
+}
+
 static const char *s_spec = "2";
+static void (*s_log_func)(unsigned char) = default_logger;
+
+void mg_log_set_callback(void (*fn)(unsigned char)) {
+  s_log_func = fn;
+}
 
 static void logc(unsigned char c) {
-  MG_PUTCHAR(c);
+  s_log_func(c);
 }
 
 static void logs(const char *buf, size_t len) {

src/log.h

@@ -8,11 +8,19 @@ void mg_log(const char *fmt, ...);
 bool mg_log_prefix(int ll, const char *file, int line, const char *fname);
 void mg_log_set(const char *spec);
 void mg_hexdump(const void *buf, size_t len);
+void mg_log_set_fn(void (*logfunc)(unsigned char ch));
 
+#if MG_ENABLE_LOG
 #define MG_LOG(level, args)                                                \
   do {                                                                     \
     if (mg_log_prefix((level), __FILE__, __LINE__, __func__)) mg_log args; \
   } while (0)
+#else
+#define MG_LOG(level, args) \
+  do {                      \
+    if (0) mg_log args;     \
+  } while (0)
+#endif
 
 #define MG_ERROR(args) MG_LOG(MG_LL_ERROR, args)
 #define MG_INFO(args) MG_LOG(MG_LL_INFO, args)