[PATCH] Fix ecvt to pass tests

[Keith Packard]

Elide decimal point when no digits are right of that. Fix computation
of trailing zero length.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 newlib/libc/stdlib/ecvtbuf.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/newlib/libc/stdlib/ecvtbuf.c b/newlib/libc/stdlib/ecvtbuf.c
index e3d7b55d8..d2ba6359d 100644
--- a/newlib/libc/stdlib/ecvtbuf.c
+++ b/newlib/libc/stdlib/ecvtbuf.c
@@ -93,7 +93,8 @@ print_f (struct _reent *ptr,
     {
       if (p == start)
 	*buf++ = '0';
-      *buf++ = '.';
+      if (decpt < 0 && ndigit > 0)
+	*buf++ = '.';
       while (decpt < 0 && ndigit > 0)
 	{
 	  *buf++ = '0';
@@ -148,11 +149,15 @@ print_e (struct _reent *ptr,
     }
 
   *buf++ = *p++;
-  if (dot || ndigit != 0)
-    *buf++ = '.';
+  if (ndigit > 0)
+    dot = 1;
 
   while (*p && ndigit > 0)
     {
+      if (dot) {
+	*buf++ = '.';
+	dot = 0;
+      }
       *buf++ = *p++;
       ndigit--;
     }
@@ -168,6 +173,10 @@ print_e (struct _reent *ptr,
     {
       while (ndigit > 0)
 	{
+	  if  (dot) {
+	    *buf++ = '.';
+	    dot = 0;
+	  }
 	  *buf++ = '0';
 	  ndigit--;
 	}
@@ -246,7 +255,7 @@ fcvtbuf (double invalue,
 
   /* Now copy */
 
-  done = -*decpt;
+  done = 0;
   while (p < end)
     {
       *fcvt_buf++ = *p++;
-- 
2.24.0