Use fgets for read-line

examples/cat.scm

@@ -0,0 +1,21 @@
+(import (scheme base) 
+        (scheme file) 
+        (scheme write))
+
+(define (cat fname)
+  (call-with-input-file
+    fname
+    (lambda (fp)
+      (define (loop)
+        (let ((s (read-line fp)))
+          (cond
+           ((not (eof-object? s))
+            (display s)
+            ;(newline)
+            (loop)))))
+      (loop))))
+
+(cat
+  "cyclone.scm"
+  ;"scheme/base.sld"
+)

runtime.c

@@ -2415,22 +2415,21 @@ object Cyc_io_read_line(void *data, object cont, object port)
 {
   FILE *stream = ((port_type *) port)->fp;
   char buf[1024];
-  int i = 0, c;
+  //int i = 0, c;
 
   set_thread_blocked(data, cont);
-  while (1) {
-    c = fgetc(stream);
-    if (c == EOF && i == 0) {
+  errno = 0;
+  if (fgets(buf, 1023, stream) != NULL) {
+    make_string(s, buf);
+    return_thread_runnable(data, &s);
+  } else {
+    if (feof(stream)) {
+      return_thread_runnable(data, Cyc_EOF);
+    } else {
+      // TODO: can't do this because we said thread could be blocked
+      //Cyc_rt_raise2(data, "Error reading from file: ", obj_int2obj(errno));
       return_thread_runnable(data, Cyc_EOF);
-    } else if (c == EOF || i == 1023 || c == '\n') {
-      buf[i] = '\0';
-      {
-        make_string(s, buf);
-        return_thread_runnable(data, &s);
-      }
     }
-
-    buf[i++] = c;
   }
   return NULL;
 }