Fix TID parser bug

I noticed this inconsistency in the error messages below:

 (gdb) print --1
 Left operand of assignment is not an lvalue.

 (gdb) thread apply 1 print --1

 Thread 1 (Thread 0x7ffff7fb6740 (LWP 17805)):
 inverted range

The "inverted range" error happens because get_number_trailer returns
0 to indicate error, but number_or_range_parser::get_number is not
checking for that.  I tried detected the error there, but that doesn't
work because number_of_range_parser is used in places that _do_ want
to legitimately handle 0.  IMO we should fix get_number_trailer's
interface or use something else when we want to parse 0 too.

I've decided to fix it in a different way, similarly to how
number_or_range_parser::finished was changed in commit 529c08b25ec7
("Add helper functions parse_flags and parse_flags_qcs").

Seems like a good change, even if we tweaked
number_or_range_parser::get_number, as it simplifies
thread_apply_command and makes them consistent with
number_or_range_parser::finished().

We now get the same error message in both cases:

 (gdb) print --1
 Left operand of assignment is not an lvalue.

 (gdb) thread apply 1 print --1

 Thread 1 (Thread 0x7ffff7fb6740 (LWP 17805)):
 Left operand of assignment is not an lvalue.

gdb/ChangeLog:
2019-06-13  Pedro Alves  <palves@redhat.com>

	* thread.c (thread_apply_command): Adjust TID parsing.
	* tid-parse.c (tid_range_parser::finished): Ensure parsing end is
	detected before end of string.
	(tid_is_in_list): Error out if LIST is invalid.

gdb/testsuite/ChangeLog:
2019-06-13  Pedro Alves  <palves@redhat.com>

	* gdb.multi/tids.exp: Adjust expected output.  Add "thread apply 1
	foo --1" test.

1 files changed, 9 insertions, 1 deletions

diff --git a/gdb/tid-parse.c b/gdb/tid-parse.c
index 828362e..07d7d2c 100644
--- a/gdb/tid-parse.c
+++ b/gdb/tid-parse.c
@@ -139,7 +139,13 @@ tid_range_parser::finished () const
   switch (m_state)
     {
     case STATE_INFERIOR:
-      return *m_cur_tok == '\0';
+      /* Parsing is finished when at end of string or null string,
+	 or we are not in a range and not in front of an integer, negative
+	 integer, convenience var or negative convenience var.  */
+      return (*m_cur_tok == '\0'
+	      || !(isdigit (*m_cur_tok)
+		   || *m_cur_tok == '$'
+		   || *m_cur_tok == '*'));
     case STATE_THREAD_RANGE:
     case STATE_STAR_RANGE:
       return m_range_parser.finished ();
@@ -311,6 +317,8 @@ tid_is_in_list (const char *list, int default_inferior,
     return 1;
 
   tid_range_parser parser (list, default_inferior);
+  if (parser.finished ())
+    invalid_thread_id_error (parser.cur_tok ());
   while (!parser.finished ())
     {
       int tmp_inf, tmp_thr_start, tmp_thr_end;