Bug 690152, Regression: Input from stdin on OS X

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Continue to access the stream while reading a string (sgets()) until the 
string is filled, EOF is reached, or an error occurs. Don't return after 
first partial read.

Old code did the same thing for 1-byte reads. This handling is now
extended to the reads of any size.

No differences was found in the testing against 'comparefiles' and CET 
suite.

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Index: gs/base/stream.c
===================================================================
--- gs/base/stream.c	(revision 9301)
+++ gs/base/stream.c	(working copy)
@@ -535,7 +535,7 @@
 		 */
 		s->srptr = s->srlimit = s->cbuf - 1;
 		s->position += cw.ptr - wptr;
-		if (status != 1 || cw.ptr == cw.limit)
+		if (status <= 0 || cw.ptr == cw.limit)
 		    break;
 	    }
 	    c = spgetc(s);

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