#2103 core dump while running all.dem

[Shigeharu TAKENO]

I compiled git snapshot at 2018-11-27 on Solaris 10, and run all.dem:

cd demo
../src/gnuplot all.dem < /dev/null

But it stopped by segmentation fault in pm3d.dem. It may occur at "test palette" commend.
Doing with only pm3d.dem

./src/gnuplot pm3d.dem < /dev/null

is no problem.
The attachment file is the result of gdb.

[Shigeharu TAKENO]

The segmentation fault also occurs for the following simple script:

load "fit.dem"
reset
test palette

[Shigeharu TAKENO]

In save.c, fprintf() may write null string.
Attached patch may fix it.

[Shigeharu TAKENO]

In set.c, fit_verbosity may be set to -1.
Attached patch may fix it.

[Ethan Merritt]

Applied. Thanks.