SVF: clean up, mostly for TAP state name handling

- Use the name mappings all the other code uses:
    + name-to-state ... needed to add one special case
    + state-to-name
 - Improve various diagnostics:
    + don't complain about a "valid" state when the issue
      is actually that it must be "stable"
    + say which command was affected
 - Misc:
    + make more private data and code be static
    + use public DIM() not private dimof()
    + shorten the affected lines

Re the mappings, this means we're more generous in inputs we
accept, since case won't matter.  Also our output diagnostics
will be a smidgeon more informative, saying "RUN/IDLE" not
just "IDLE" (emphasizing that there can be side effects).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/jtag/interface.c

@@ -365,6 +365,10 @@ tap_state_t tap_state_by_name(const char *name)
 {
 	tap_state_t x;
 
+	/* standard SVF name is "IDLE" */
+	if (0 == strcasecmp(name, "IDLE"))
+		return TAP_IDLE;
+
 	for (x = 0 ; x < TAP_NUM_STATES ; x++) {
 		/* be nice to the human */
 		if (0 == strcasecmp(name, tap_state_name(x))) {

src/jtag/interface.h

@@ -160,9 +160,6 @@ bool tap_is_state_stable(tap_state_t astate);
  */
 tap_state_t tap_state_transition(tap_state_t current_state, bool tms);
 
-/// Provides user-friendly name lookup of TAP states.
-tap_state_t tap_state_by_name(const char *name);
-
 /// Allow switching between old and new TMS tables. @see tap_get_tms_path
 void tap_use_new_tms_table(bool use_new);
 /// @returns True if new TMS table is active; false otherwise.

src/jtag/jtag.h

@@ -102,7 +102,10 @@ typedef enum tap_state
  * Function tap_state_name
  * Returns a string suitable for display representing the JTAG tap_state
  */
-const char* tap_state_name(tap_state_t state);
+const char *tap_state_name(tap_state_t state);
+
+/// Provides user-friendly name lookup of TAP states.
+tap_state_t tap_state_by_name(const char *name);
 
 /// The current TAP state of the pending JTAG command queue.
 extern tap_state_t cmd_queue_cur_state;