non-busybox dhcp clients (was: PATCH: ifupdown.c, udhcpc, and standalone shell)

[Gabriel L. Somlo]

>> What if you build busybox with 'which' turned off ?
>
> this problem is already well-solved.  the code goes into libbb, where
> any applet that needs it can use it.

We're talking about this much code:

static int execable(char *program)
{
    struct stat buf;
    char *path = xstrdup(getenv("PATH"));
    char *p;
    int found = 0;
    for (p = strtok(path, ":"); p && !found; p = strtok(NULL, ":")) {
        p = xasprintf("%s/%s", p, program);
        found = (stat(p, &buf) == 0) &&
                S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode);
        free(p);
    }
    free(path);
    return found;
}

Is there anything in libbb that I can use instead of this ? If not,
and you guys want to add something in there, let me know and I'll use
it :)

Thanks,
Gabriel