Also some minor edits.

that list in case something goes wrong in the function and we must bail out.
Courtesy of the torture testing.

accordingly

previously they could return a piece of the string, making it impossible
for the caller to detect errors.

happens

When failing, it should not tamper at all with the data it was supposed to
add to the cache.

The -t is the "torture" test that first runs the test and counts the number
of allocations performed during it, then it runs the test repeatedly over and
over again and makes alloc number N fail to verify that we detect and return
properly from error cases everywhere.

quotes...

building formposts

internally-used name.

Also, make sure we have room for the trailing zero, only scan to size-1.

Gisle Vanem reported.

known source files. Not actually verified to work yet.