ipf(1): Use strchr(3) instead of deprecated index(3)

[cy]

Looks good.

~Cy

head/contrib/ipfilter/tools/ipf.c

struct ptrace_lwpinfo32 {
         lwpid_t pl_lwpid;       /* LWP described. */
         int     pl_event;       /* Event that stopped the LWP. */
         int     pl_flags;       /* LWP flags. */
         sigset_t        pl_sigmask;     /* LWP signal mask */
         sigset_t        pl_siglist;     /* LWP pending signal */
         struct siginfo32 pl_siginfo;        /* siginfo for signal */
         char        pl_tdname[MAXCOMLEN + 1];        /* LWP name. */
         int     pl_child_pid;           /* New child pid */
+        u_int           pl_syscall_code;
+        u_int           pl_syscall_narg;
 };
 
 #endif
 
 /*
  * Functions implemented using PROC_ACTION():
  *
  * proc_read_regs(proc, regs)
ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
         pl32->pl_lwpid = pl->pl_lwpid;
         pl32->pl_event = pl->pl_event;
         pl32->pl_flags = pl->pl_flags;
         pl32->pl_sigmask = pl->pl_sigmask;
         pl32->pl_siglist = pl->pl_siglist;
         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
         strcpy(pl32->pl_tdname, pl->pl_tdname);
         pl32->pl_child_pid = pl->pl_child_pid;
+        pl32->pl_syscall_code = pl->pl_syscall_code;
+        pl32->pl_syscall_narg = pl->pl_syscall_narg;
 }
 #endif /* COMPAT_FREEBSD32 */
 
 /*
  * Process debugging system call.
  */
 #ifndef _SYS_SYSPROTO_H_
 struct ptrace_args {
if (td2->td_dbgflags & TDB_FORK) {
                         pl->pl_flags |= PL_FLAG_FORKED;
                         pl->pl_child_pid = td2->td_dbg_forked;
                 }
                 if (td2->td_dbgflags & TDB_CHILD)
                         pl->pl_flags |= PL_FLAG_CHILD;
                 pl->pl_sigmask = td2->td_sigmask;
                 pl->pl_siglist = td2->td_siglist;
                 strcpy(pl->pl_tdname, td2->td_name);
+                if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
+                        pl->pl_syscall_code = td2->td_dbg_sc_code;
+                        pl->pl_syscall_narg = td2->td_dbg_sc_narg;
+                } else {
+                        pl->pl_syscall_code = 0;
+                        pl->pl_syscall_narg = 0;
+                }
 #ifdef COMPAT_FREEBSD32
                 if (wrap32)
                         ptrace_lwpinfo_to32(pl, pl32);
 #endif
                 CTR5(KTR_PTRACE,
             "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d",
                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
                     pl->pl_child_pid);