https://gitlab.synchro.net/main/sbbs/-/commit/20cfdb185e469b22ec9152ff
Modified Files:
src/sbbs3/data_ovl.cpp userdat.c userdat.h
Log Message:
Split-up the opening and writing of msg pointer files, to help debug issue

Reported by Keyop (upon being auto-disconnected overnight):
!ERROR 9 (Bad file descriptor) in data_ovl.cpp line 47 (putmsgptrs) writing "message pointers" access=0

Unfortunately, the way putmsgptrs() was written, we couldn't tell if this was an open (data/user/*.subs file) issue or a writing issue.

So create putmsgptrs_fp() and use that from sbbs_t::putmsgptrs(), so we can
log a different error (with more accurate details) if it's a file-open failure versues a file-write failure.
--- SBBSecho 3.20-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)