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diff -up ksh-20120801/src/lib/libast/sfio/sfcvt.c.rounditgood ksh-20120801/src/lib/libast/sfio/sfcvt.c
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--- ksh-20120801/src/lib/libast/sfio/sfcvt.c.rounditgood	2014-02-27 16:45:54.630161032 +0100
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+++ ksh-20120801/src/lib/libast/sfio/sfcvt.c	2014-02-27 16:45:54.658161205 +0100
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@@ -491,7 +491,7 @@ int		format;		/* conversion format		*/
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 				*decpt += 1;
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 				if(!(format&SFFMT_EFORMAT))
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 				{	/* add one more 0 for %f precision */
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-					ep[-1] = '0';
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+					if(ep-sp>1) ep[-1] = '0';
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 					ep += 1;
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 				}
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 			}