tree fb461ac56b5f0e3c61a3fa0bdd909006cb584683
parent 6beae586d64f414510c04723bee475b4234bdd80
author Cosmin Truta <ctruta@gmail.com> 1704819242 +0200
committer Cosmin Truta <ctruta@gmail.com> 1704819242 +0200

pngminus: Delete the incomplete output files upon premature termination

Defer the program termination on error until all files are closed and
(if applicable) all incompletely-written output files are deleted.

In addition, perform the following maintenance tasks:
 * Rename and document the internal helpers used by the functions
   `png2pnm` and `pnm2png`.
 * Unset the executable permission bits for the *.bat test programs.