add buffer_putnlflush

CHANGES

@@ -2,6 +2,7 @@
   fixed several bugs in test/uudecode.c
   add uninstall target
   add uint16_read API like the uint32_read one
+  add buffer_putnlflush
 
 0.12:
   add textcode api for uuencode/uudecode, base64, quoted printable,

buffer.h

@@ -26,6 +26,7 @@ extern int buffer_putsalign(buffer* b,const char* x);
 extern int buffer_putsflush(buffer* b,const char* x);
 
 extern int buffer_putspace(buffer* b);
+extern int buffer_putnlflush(buffer* b); /* put \n and flush */
 
 #define buffer_PUTC(s,c) \
   ( ((s)->a != (s)->p) \

buffer/buffer_putnlflush.c

@@ -0,0 +1,7 @@
+#include "str.h"
+#include "buffer.h"
+
+int buffer_putspace(buffer* b) {
+  static char nl='\n';
+  return buffer_putflush(b,&nl,1);
+}