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Mail Archives: cygwin/2000/06/28/22:46:28

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Message-ID: <B9906C3F4BB3D311A60F009027463EE991BC99@mgmgrand.adtech-inc.com>
From: "Jimen.Ching" <JChing AT adtech-inc DOT com>
To: cygwin AT sourceware DOT cygnus DOT com
Subject: sprintf bug
Date: Wed, 28 Jun 2000 16:45:32 -1000
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Hi all,

I think there is a bug with sprintf in 1.1.2.  The following is the
code snippet that reproduces the bug:

int
maint(int argc, char *argv[])
{
  char buf[256];
  double dbl = 0.0;

  sprintf(buf, "%4.3e\n", dbl);
  printf("%s", buf); /* buf contains garbage characters. */

  return;
}

It seems if you have a non-zero value after the dot in the format,
then sprintf includes that many garbage characters.  In the above case,
there are 3 garbage characters.

--jc
--
jimen AT adtech-inc DOT com     Adtech, Inc.    (808) 734-3300

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<P><FONT SIZE=2>Hi all,</FONT>
</P>

<P><FONT SIZE=2>I think there is a bug with sprintf in 1.1.2.&nbsp; The following is the</FONT>
<BR><FONT SIZE=2>code snippet that reproduces the bug:</FONT>
</P>

<P><FONT SIZE=2>int</FONT>
<BR><FONT SIZE=2>maint(int argc, char *argv[])</FONT>
<BR><FONT SIZE=2>{</FONT>
<BR><FONT SIZE=2>&nbsp; char buf[256];</FONT>
<BR><FONT SIZE=2>&nbsp; double dbl = 0.0;</FONT>
</P>

<P><FONT SIZE=2>&nbsp; sprintf(buf, &quot;%4.3e\n&quot;, dbl);</FONT>
<BR><FONT SIZE=2>&nbsp; printf(&quot;%s&quot;, buf); /* buf contains garbage characters. */</FONT>
</P>

<P><FONT SIZE=2>&nbsp; return;</FONT>
<BR><FONT SIZE=2>}</FONT>
</P>

<P><FONT SIZE=2>It seems if you have a non-zero value after the dot in the format,</FONT>
<BR><FONT SIZE=2>then sprintf includes that many garbage characters.&nbsp; In the above case,</FONT>
<BR><FONT SIZE=2>there are 3 garbage characters.</FONT>
</P>

<P><FONT SIZE=2>--jc</FONT>
<BR><FONT SIZE=2>--</FONT>
<BR><FONT SIZE=2>jimen AT adtech-inc DOT com&nbsp;&nbsp;&nbsp;&nbsp; Adtech, Inc.&nbsp;&nbsp;&nbsp; (808) 734-3300</FONT>
</P>

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