New function: portable-abs-path-p.

* share/txr/stdlib/doc-syms.tl: Updated.

* stream.c (portable_abs_path_p): New function, exact copy of
old abs_path_p.
(abs_path_p): Rewritten to be specific to host platform. No
Windows-drive-like prefixes are checked on POSIX.
(stream_init): Register new function. Register abs-path-p
conditionally based on 258 compatibility.

* stream.h (portable_abs_path_p): Declared.

* txr.1: Documented, with compat notes.

1 files changed, 1 insertions, 0 deletions

diff --git a/stream.h b/stream.h
index 9a1e9d4e..6d84f7a0 100644
--- a/stream.h
+++ b/stream.h
@@ -241,6 +241,7 @@ val catenated_stream_p(val obj);
 val catenated_stream_push(val new_stream, val cat_stream);
 val remove_path(val path, val throw_on_error);
 val rename_path(val from, val to);
+val portable_abs_path_p(val path);
 val abs_path_p(val path);
 val pure_rel_path_p(val path);
 val base_name(val path, val suff);