Failing a command with code RET_SYN prints help and doesn't charge
BTUs. Failing with code RET_FAIL doesn't print help and charges BTUs.
A couple of command failures were changed or added recently to fail
with RET_SYN, because they're due to invalid player input. Some of
them, however, can happen after the command already did something, so
BTUs must be charged, or else players can deliberately fail the
command to save BTUs:
* Commit 9eda5f87 adds RET_SYN failures when getting player input
fails for:
- arm third argument
- deliver fourth argument
- fire third argument
- lmine second argument
- order d fourth argument
- range second argument
- sail second argument
- tend third argument
* Commit be41e70f likewise for:
- designate second argument
- morale second argument
- set third argument
- tend fourth argument
* Commit d000bf92 likewise (with a bogus commit message) for bdes
second argument.
* Commit 9f4ce71a likewise for ltend third and fourth argument.
* Commit 9031b03b changes failure code from RET_FAIL when getting
player input fails for threshold third argument. It adds RET_SYN
failure when the argument is bad. Some bad arguments already failed
that way before.
* Commit a7cf69af changes it from RET_FAIL when designate second
argument is bad.
Change them all to fail with RET_FAIL.
Many other places have the same bug, but those are left for another
day.
The old code used getstarg() to get an argument with a different
prompt than snxtitem() uses, then passed the value to snxtitem()
unchecked. If the player aborts, getstarg() returns a null pointer,
and snxtitem() prompts again. Affected:
* load/lload plane/land third argument; load_plane_ship(),
load_land_ship(), load_plane_land(), load_land_land()
* bomb, drop, fly, paradrop, recon and sweep second argument;
get_planes()
* tend and ltend second and fourth argument; ltend(), tend(),
tend_land()
* mission second argument; mission()
Fix by making snxtitem() taking a prompt argument, null pointer
requests the old prompt.
Use that to simplify multifire() and torp(). Change the other callers
to pass NULL.
The old code didn't return RET_SYN when aborting at the following
prompts:
* designate second argument
* morale second argument
* route second argument
* set third argument
* tend fourth argument
* zdone last argument
other. Ensure headers in include/ can be included in any order
(except for econfig-spec.h, which is special). New header types.h to
help avoid inclusion cycles. Sort include directives. Remove some
superflous includes.
thread entrypoints:
(lwpSelect, shutdown_sequence): Parameters didn't match thread entry
point prototype.
(lwpEntryPoint): Arguments didn't match thread entry point prototype.
Change linkage of functions without prototype declaration to static
where possible.
Remove some superflous declarations, replace others by suitable
includes.
