fixes

[dhog@plan9.cs.su.oz.au dhog@plan9.cs.su.oz.au]

>Did anybody port "patch" to plan9?  That would make
>diffs a lot more useful.

Yes, and it's not too hard either.  You can run patch's configure script
under ape, and it works suprisingly well.  Then you just have to edit the
Makefile, adding "LIBS = -lap" and deleting "rename.o" from OBJS, and
edit util.c, replacing ask() with something sensible.  Oh, and you need
to apply the fix to ape's rename() function that I posted to the list.

So, just run "ape/psh", then type "sh configure", edit the Makefile and util.c
as suggested above, then type make, and you should get a patch binary.
If patch corrupts your files, then you need to fix rename() (don't try this
at home kids!)

Here is the hacked version of ask() that I use, which doesn't try to read
standard output or standard error:

void
ask(pat,arg1,arg2,arg3)
char *pat;
long arg1,arg2,arg3;
{
    static int ttyfd = -1;
    int r;

    Sprintf(buf, pat, arg1, arg2, arg3);
    Fflush(stderr);
    if (ttyfd >= 0 || (ttyfd = open("/dev/cons", 2)) >= 0) {
	write(ttyfd, buf, strlen(buf));
	r = read(ttyfd, buf, sizeof buf);
	Close(ttyfd);
    }
    else {				/* no terminal at all--default it */
	buf[0] = '\n';
	r = 1;
    }
    if (r <= 0)
	buf[0] = 0;
    else
	buf[r] = '\0';
}