BR3414012: Make %if[n]def to handle tail spaces

In case if there a trailing spaces after expansion
%if[n]def might produce a false alarms on macro id
being expected.

Note it also makes the constructions like bare

	%ifdef
	%endif

invalid, while before they were passed well without
a notice.

Reported-by: KO Myung-Hun
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/preproc.c b/preproc.c
index 63b0c61..6360dcc 100644
--- a/preproc.c
+++ b/preproc.c
@@ -1910,8 +1910,8 @@ static bool if_condition(Token * tline, enum preproc_token ct)
 
     case PPC_IFDEF:
         j = false;              /* have we matched yet? */
-        while (tline) {
-            skip_white_(tline);
+        skip_white_(tline);
+        do {
             if (!tline || (tline->type != TOK_ID &&
                            (tline->type != TOK_PREPROC_ID ||
                             tline->text[1] != '$'))) {
@@ -1922,7 +1922,8 @@ static bool if_condition(Token * tline, enum preproc_token ct)
             if (smacro_defined(NULL, tline->text, 0, NULL, true))
                 j = true;
             tline = tline->next;
-        }
+            skip_white_(tline);
+        } while (tline);
         break;
 
     case PPC_IFENV: