Re-write t_agetstr() so that it does not use realloc so userland
programs don't break. We now use an internal buffer to keep track
of the memory we allocate. This changes the api of t_agetstr() to
take 2 fewer arguments, but there are not many programs that use it.
Please note that this does not change binary compatibility with the
previous t_agetstr() since the usage was:
char *area, *p;
*area = NULL;
t_agetstr(ti, "ic", &area, &p);
...
free(area);
Since we don't touch the arguments and free(NULL) is a no-op, nothing
breaks.
Since we don't break binary compatibility there is no reason to bump
the library's major number, but since we change t_agetstr() I'll bump
the minor number for good measure.
until the problem gets addressed properly. The following fix
is a stopgap measure to stop the leaking :-(
I fixed the t_getstr() memory leak problem, but that instantly
revealed a problem in t_agetstr() which is an extremely broken
interface. It realloc's memory, potentially moving the area where
it returned pointers into in previous calls. This function needs
to be removed and or changed. I added a horrible work-around for
now, but I will revisit the problem shortly. In the meantime nobody
should be using the t_agetstr() API, and I'll be fixing the rest
of the programs and or the API when I figure out the best solution...
This is t_agetstr() is used by:
games/hack/hack.termcap.c
games/larn/io.c
games/tetris/screen.c
lib/libterm/termcap.c
lib/libterm/termcap.h
libexec/getty/main.c
usr.bin/top/screen.c
usr.bin/ul/ul.c
- use strlcpy() instead of strncpy() to avoid the off-by-one error
and the three missing '\0' terminations.
- perform bounds checks to make sure we don't turn this into a random
memory writing tool using setenv HOME `perl -e 'print "a"x5000'`
these capabilities and stashes them in "struct tinfo" for t_goto to
use. This makes the t_goto call more efficient and plugs a memory
leak that was present in the original t_goto implementation.
Thanks to Itojun for spotting this one too!
ZZ attribute which indicates the TERMCAP was exported from another
programme and has been truncated. Iff a real termcap entry cannot be
found then TERMCAP with a ZZ in it will be used as a last resort.
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.
the first two items result in the addition of code similar to the
following in various functions:
_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif
termcap entries simultaneously and lifts the 1024 byte limit on the termcap
entry. The original termcap api is unchanged but also no longer has
the 1024 byte limit if the termcap functions are used.
perry