Re: [Dvipng] dvipng crash in stringrgb function

[Ahzo]

Hi,

Thanks for fixing the second crash, as well.

There's a third (and probably last) issue I've found with dvipng's handling of 
command-line parameters.
The problem can be reproduced as follows:
$ dvipng - --gamma 0.5
This is dvipng 1.15 Copyright 2002-2015 Jan-Ake Larsson
Segmentation fault

This is caused by a wrong format identifier for printf, using %s instead of %f 
for gamma, which is a double. The fix is simply:
--- a/misc.c
+++ b/misc.c
@@ -351,7 +351,7 @@ bool DecodeArgs(int argc, char ** argv)
            gamma=DEFAULT_GAMMA;
          }
          Gamma(gamma);
-         Message(PARSE_STDIN,"Gamma value is %s\n", gamma);
+         Message(PARSE_STDIN,"Gamma value is %f\n", gamma);
          break;
#ifdef HAVE_GDIMAGEGIF
        } else if (strncmp(p,"if",2)==0) { /* --gif output */

If you want to give credit, mentioning Ahzo is sufficient.

Best,
Ahzo