printf/snprntffuns.c: report -1 as an error.

acinclude.m4: Refuse -1 as a normal return value.

1 files changed, 2 insertions, 5 deletions

diff --git a/printf/snprntffuns.c b/printf/snprntffuns.c
index d5d76a29f..562227908 100644
--- a/printf/snprntffuns.c
+++ b/printf/snprntffuns.c
@@ -75,10 +75,7 @@ gmp_snprintf_format (struct gmp_snprintf_t *d, const char *fmt,
       va_copy (ap, orig_ap);
       ret = vsnprintf (d->buf, avail, fmt, ap);
       if (ret == -1)
-        {
-          ASSERT (strlen (d->buf) == avail-1);
-          ret = avail-1;
-        }
+        return ret;
 
       step = MIN (ret, avail-1);
       d->size -= step;
@@ -104,7 +101,7 @@ gmp_snprintf_format (struct gmp_snprintf_t *d, const char *fmt,
       ret = vsnprintf (p, alloc, fmt, ap);
       __GMP_FREE_FUNC_TYPE (p, alloc, char);
     }
-  while (ret == alloc-1 || ret == -1);
+  while (ret == alloc-1);
 
   return ret;
 }