Can now read files from the filesystem.

hi

@@ -0,0 +1 @@
+Hello, this is used by `slurp.sh` test, please do not remove.

src/io/io.c

@@ -49,6 +49,10 @@ char *lisp_string_to_c_string( struct cons_pointer s ) {
         free( buffer );
     }
 
+    debug_print(L"lisp_string_to_c_string( ", DEBUG_IO);
+    debug_print_object( s, DEBUG_IO);
+    debug_printf( DEBUG_IO, L") => '%s'\n", result);
+
     return result;
 }
 
@@ -110,6 +114,10 @@ lisp_open( struct stack_frame *frame, struct cons_pointer frame_pointer,
         }
 
         free( url );
+
+        if ( pointer2cell(result).payload.stream.stream == NULL) {
+            result = NIL;
+        }
     }
 
     return result;
@@ -158,18 +166,23 @@ struct cons_pointer
 lisp_slurp( struct stack_frame *frame, struct cons_pointer frame_pointer,
             struct cons_pointer env ) {
     struct cons_pointer result = NIL;
-    struct cons_pointer cdr = NIL;
 
     if ( readp( frame->arg[0] ) ) {
         URL_FILE *stream = pointer2cell( frame->arg[0] ).payload.stream.stream;
+        struct cons_pointer cursor = make_string( url_fgetwc( stream ), NIL);
+        result = cursor;
 
-        for ( wint_t c = url_fgetwc( stream ); c != -1;
+        for ( wint_t c = url_fgetwc( stream ); !url_feof(stream);
               c = url_fgetwc( stream ) ) {
-            cdr = make_string( ( ( wchar_t ) c ), cdr );
+            debug_print(L"slurp: cursor is: ", DEBUG_IO);
+            debug_dump_object( cursor, DEBUG_IO);
+            debug_print(L"; result is: ", DEBUG_IO);
+            debug_dump_object( result, DEBUG_IO);
+            debug_println( DEBUG_IO);
 
-            if ( nilp( result ) ) {
+            struct cons_space_object * cell = &pointer2cell(cursor);
-                result = cdr;
+            cursor = make_string( ( wchar_t ) c , NIL);
-            }
+            cell->payload.string.cdr = cursor;
         }
     }
 

unit-tests/slurp.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+expected='"Hello, this is used by `slurp.sh` test, please do not remove.'
+actual=`echo '(slurp (open "hi"))' | target/psse | tail -2 | head -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '$expected', got '$actual'"
+    exit 1
+fi