X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/qmail/blobdiff_plain/2117e02ec495fdfd6e96b39778b701a5bcff8aa5..897b03dfcf776b99815eaddde4d58479f05ba166:/substdio.h

diff --git a/substdio.h b/substdio.h
index 7a0de6e..c3f7f7d 100644
--- a/substdio.h
+++ b/substdio.h
@@ -36,6 +36,12 @@ extern void substdio_seek();
 #define substdio_PEEK(s) ( (s)->x + (s)->n )
 #define substdio_SEEK(s,len) ( ( (s)->p -= (len) ) , ( (s)->n += (len) ) )
 
+#define substdio_BPUTC(s,c) \
+  ( ((s)->n != (s)->p) \
+    ? ( (s)->x[(s)->p++] = (c), 0 ) \
+    : substdio_bput((s),&(c),1) \
+  )
+
 extern int substdio_copy();
 
 #endif