avoid a possible sign-extension for offsets/sizes in SGI

[imager.git] / iolayert.h

diff --git a/iolayert.h b/iolayert.h
index d2dbb4dd02460a7965c9c36409241519536ce175..8d19451cec635dfffe4d14f956f769695f7671c7 100644 (file)
--- a/iolayert.h
+++ b/iolayert.h
@@ -90,6 +90,10 @@ struct i_io_glue_t {
   ((ig)->read_ptr < (ig)->read_end ? \
      *((ig)->read_ptr++) : \
      i_io_getc_imp(ig))
+#define i_io_nextc(ig) \
+  ((void)((ig)->read_ptr < (ig)->read_end ?    \
+         ((ig)->read_ptr++, 0) :               \
+         i_io_getc_imp(ig)))
 #define i_io_peekc(ig) \
   ((ig)->read_ptr < (ig)->read_end ? \
    *((ig)->read_ptr) :              \