Re: sprintf() error (compiled by VC++)

[Hans-Bernhard B. <HBB...@t-...>]

On 06.10.2011 10:01, Shigeharu TAKENO wrote:

> I saw that gnuplot.exe of CVS version compiled by VC++ reports
[...]
>    foo = sprintf("%40d %40d %40d %40d %40d %40d",1,2,3,4,5,6)
>          ^
>    "stringvar.dem", line 59: undefined value

For what it's worth: this program doesn't appear in gnuplot.exe compiled 
by Open Watcom.

> The gnuplot show no erorr message for the command
>
>    foo = sprintf("%83d",1)
>
> but it show the same error message above for the command
>
>    foo = sprintf("%84d",1)

This doesn't cause problem either.

The root of the problem appears to be the buffer size computation and 
subsequent realloc()ation in f_sprintf().  The number 84 is magic 
because it's 84 plus the length of the format string "%84d".  Go figure.