first.

help get this right.

function pointers from the outside will segfault. Idea, hints and feedback
from deraadt. ok deraadt.

Noticed by deraadt@

aliases to fake up strtou?q().  espie@ OK.

that the first char in the line is not NUL after killing comments.

field separators as empty field.  This is not what we want for
whitespace-delimited fields.

o make first arg const since we don't modify it
o use strsep() instead of strtok() as strtok() changes internal state
o add some bounds checking and use strlcat() instead of pointer arithmetic
o ANSI function headers
Originally based on a patch from Lars J. Buitinck but much modified.

some brave soul should look at it.

XXX libraries should not use atexit(3) from within, as program can terminate
with _exit.

Also fix a typo; adapted from a patch by Moritz Jodeit

o) always close .Bl tags;
o) fix usage of .Xr;
millert@ ok

o) remove extra space in the end of line;
o) remove extra blank lines in the end of file;
o) remove .Pp before .Ss;
o) CAVEAT -> CAVEATS;
o) fix usage of .Fa;
o) <blank-line> -> .Pp;
o) wrap long lines;
millert@ ok

millert@ ok
deraadt@ ok to commit

will be overwritten by subsequent calls; suggested by pjanzen, ok millert

of getopt() to char variables instead of int lose on arches where char is
unsigned by default.
Clean the example by not pasting parts of <unistd.h> into it, and by not
using atoi(3).

millert@ ok

clobbered by longjmp / vfork instead of the gcc "(void)&foo;" hack.

fail anyway so check for that.  Also convert "." to "" since that
way we avoid the lstat() (which we don't need) and the subsequent
chdir() and some dir checks.

OK deraadt@