os_stream: add printf facility

1 files changed, 40 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/os/os_stream.c b/src/gallium/auxiliary/os/os_stream.c
new file mode 100644
index 0000000000..2d4e1852ba
--- /dev/null
+++ b/src/gallium/auxiliary/os/os_stream.c
@@ -0,0 +1,40 @@
+#include "pipe/p_config.h"
+
+#include "os_stream.h"
+#include "util/u_memory.h"
+#include "util/u_string.h"
+
+int
+os_default_stream_vprintf (struct os_stream* stream, const char *format, va_list ap)
+{
+   char buf[1024];
+   int retval;
+
+   retval = util_vsnprintf(buf, sizeof(buf), format, ap);
+   if(retval <= 0)
+   {}
+   else if(retval < sizeof(buf))
+      stream->write(stream, buf, retval);
+   else
+   {
+      int alloc = sizeof(buf);
+      char* str = NULL;
+      for(;;)
+      {
+         alloc += alloc;
+         if(str)
+            FREE(str);
+         str = MALLOC(alloc);
+         if(!str)
+            return -1;
+
+         retval = util_vsnprintf(str, alloc, format, ap);
+      } while(retval >= alloc);
+
+      if(retval > 0)
+         stream->write(stream, str, retval);
+      FREE(str);
+   }
+
+   return retval;
+}