New l and u letters in stream open mode strings.

* stream.c (parse_mode): Recognize "l" and "u", and
set new flags.
(set_mode_props): More complicated behavior to
integrate the new options with the line mode defaulting
behavior of "i".

* stream.h (struct stdio_mode): New members unbuf
and linebuf. All members become bit fields of width 1.
(stdio_mode_init_trivial): Initializers for new members.

* txr.1: Documented.

1 files changed, 10 insertions, 8 deletions

diff --git a/stream.h b/stream.h
index b96a0ae6..2474ce13 100644
--- a/stream.h
+++ b/stream.h
@@ -83,16 +83,18 @@ struct strm_ops {
 }
 
 struct stdio_mode {
-  int malformed;
-  int read;
-  int write;
-  int create;
-  int append;
-  int binary;
-  int interactive;
+  unsigned malformed : 1;
+  unsigned read : 1;
+  unsigned write : 1;
+  unsigned create : 1;
+  unsigned append : 1;
+  unsigned binary : 1;
+  unsigned interactive : 1;
+  unsigned unbuf : 1;
+  unsigned linebuf : 1;
 };
 
-#define stdio_mode_init_trivial(read) { 0, read, 0, 0, 0, 0, 0 }
+#define stdio_mode_init_trivial(read) { 0, read, 0, 0, 0, 0, 0, 0, 0 }
 
 #define std_input (deref(lookup_var_l(nil, stdin_s)))
 #define std_output (deref(lookup_var_l(nil, stdout_s)))