🚀 go-pugleaf

I'm trying to write some postscript which will color a hexagonal grid,
reading the color data from the end of my ps file.  I'm reading one
byte for each hexagon, then doing some bit-twiddling to get values to call
setrgbcolor with before filling the hexagon.

I've got a version using "read" which works, but since "read" treats my
newline characters as valid binary data, it's not entirely
satisfactory.

What I want to use is "readhexstring", but since what this reads in is
treated as a string rather than an integer, I'm having trouble.  I
need to convert my one-byte string into an integer having the same
binary representation.  I don't want "cvi", because this parses a
string which represents an integer to us humans, and puts that value
on the stack -- cvi would read (1) and put the integer value 1 on the
stack, but what I need would take (1) and put the integer value 49 --
the ASCII value of the character 1 -- on the stack.

--
|  Forrest Cahoon      | cahoon@cs.umn.edu |------------------------------|
|  850 21st Ave SE     |-------------------| Only unbalanced people       |
|  Mpls MN  55414-2514 |                   |        can tip the scales... |