Bug#821: Patch for /bin/echo: check write error

[Lars Wirzenius <liw@iki.fi>]

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This bug is now over 19 months old. It would be nice to get it
fixed. Patch enclosed.

-- 
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--- echo-original.c	Fri Nov  8 03:59:46 1996
+++ echo-check-write-error.c	Fri Nov  8 03:59:10 1996
@@ -225,5 +225,9 @@
     }
   if (display_return)
     putchar ('\n');
+    
+  if (ferror (stdout) || fflush (stdout) == EOF)
+    error (1, errno, "error writing to the standard output");
+    
   exit (0);
 }

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