X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Ftarget-format.lisp;h=7ed2b55a1ff25bc46b327280584144e6de797a81;hb=fe6da9f355488152649de48885b96205043c0f82;hp=a5ef5e6eb44cded3f631e9a782ac514db774ed6a;hpb=8f1d4a2508e8d81564822a1668fe30a490b9c3f6;p=sbcl.git

diff --git a/src/code/target-format.lisp b/src/code/target-format.lisp
index a5ef5e6..7ed2b55 100644
--- a/src/code/target-format.lisp
+++ b/src/code/target-format.lisp
@@ -170,6 +170,14 @@
 ;;;; format interpreters and support functions for simple output
 
 (defun format-write-field (stream string mincol colinc minpad padchar padleft)
+  (when (and colinc (<= colinc 0))
+    (error 'format-error
+           :complaint "The value of colinc is ~a, should be a positive integer"
+           :args (list colinc)))
+  (when (and mincol (< mincol 0))
+    (error 'format-error
+           :complaint "The value of mincol is ~a, should be a non-negative integer"
+           :args (list mincol)))
   (unless padleft
     (write-string string stream))
   (dotimes (i minpad)
@@ -752,9 +760,10 @@
            :complaint
            "cannot specify either colon or atsign for this directive"))
   (interpret-bind-defaults ((count 1)) params
-    (fresh-line stream)
-    (dotimes (i (1- count))
-      (terpri stream))))
+    (when (plusp count)
+      (fresh-line stream)
+      (dotimes (i (1- count))
+       (terpri stream)))))
 
 (def-format-interpreter #\| (colonp atsignp params)
   (when (or colonp atsignp)