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Given we have a util.c anyway it does not make any sense to duplicate
code here. This way, error handling and output is in one place and one
does not have to change things in multiple different files. This also
reduces code duplication by a lot.
It also solves an older bug where the error reporting was not on point:
$ echo "farb" | ff2png
ff2png: fread: Success
(It also lacked a newline)
Now it properly reports
$ echo "farb" | ff2png
ff2png: fread: Unexpected end of file
I also fixed some other minor details, for instance that all error
messages should begin with a capital letter.
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We use some OpenBSD code in util.c (namely by Ted Unangst, Todd C.
Miller and Otto Moerbeek), which is licensed under the ISC license.
To make it clearer and make it easier to see what farbfeld really is licensed
under, we include these authors in the LICENSE file and remove the
explicit headers from util.c. While at it, we also remove superfluous
includes and shove them to the top.
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To be honest, it can happen too easily that the user forgets to put
the colour in quotation marks, yielding in the rest of the
pipeline to be discarded as a comment.
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For small images, it could happen that the output stream would not be
flushed before exit(), resulting in a lack of error-reporting on
a full device. Using fflush(), a function I first introduced in sbase,
we do the flushing before returning manually and report errors if they
occurred.
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parse_mask() -> parse a mask-color #xxxxxx
ereallocarray()
estrtonum()
These will come in handy in the respective tools.
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