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* tree: rename usageprint() to print_usage()Joursoir2022-08-221-1/+1
| | | | Rename macro based on naming rules.
* tree: usageprint() macro no longer returns an error by itselfJoursoir2022-08-221-0/+1
| | | | | | This patch also does: - Moves usageprint() from constants.h to output.h - Returns an error after using useprint() clearly.
* tree: introduce header file for outputJoursoir2022-08-211-0/+26
The file contains only one macro right now. But it's more convenient if the header with the appropriate name will do output routines. This is one of the steps on the way to get rid of errprint_*() macros and handle errors by yourself. For more context see other patches under the same topic specified below. TOPIC=drop_errprint