1 files changed, 30 insertions, 1 deletions
diff --git a/libvpx/tools_common.c b/libvpx/tools_common.c
index 92de794..44b2a3f 100644
--- a/libvpx/tools_common.c
+++ b/libvpx/tools_common.c
@@ -7,8 +7,11 @@
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
-#include <stdio.h>
 #include "tools_common.h"
+
+#include <stdarg.h>
+#include <stdlib.h>
+
 #if defined(_WIN32) || defined(__OS2__)
 #include <io.h>
 #include <fcntl.h>
@@ -20,6 +23,18 @@
 #endif
 #endif
 
+#define LOG_ERROR(label) do {\
+  const char *l = label;\
+  va_list ap;\
+  va_start(ap, fmt);\
+  if (l)\
+    fprintf(stderr, "%s: ", l);\
+  vfprintf(stderr, fmt, ap);\
+  fprintf(stderr, "\n");\
+  va_end(ap);\
+} while (0)
+
+
 FILE *set_binary_mode(FILE *stream) {
   (void)stream;
 #if defined(_WIN32) || defined(__OS2__)
@@ -27,3 +42,17 @@ FILE *set_binary_mode(FILE *stream) {
 #endif
   return stream;
 }
+
+void die(const char *fmt, ...) {
+  LOG_ERROR(NULL);
+  usage_exit();
+}
+
+void fatal(const char *fmt, ...) {
+  LOG_ERROR("Fatal");
+  exit(EXIT_FAILURE);
+}
+
+void warn(const char *fmt, ...) {
+  LOG_ERROR("Warning");
+}