mdocml: In roff_cond_sub(), make sure that the incorrect input sequence

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
In roff_cond_sub(), make sure that the incorrect input sequence `\\}',
when found on a macro line, does not close a conditional block.
The companion function roff_cond_text() already did this correctly,
but make the code more readable without functional change.
While here, report the correct column number in related error messages.

Modified Files:
--------------
    mdocml:
        roff.c

Revision Data
-------------
Index: roff.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/roff.c,v
retrieving revision 1.196
retrieving revision 1.197
diff -Lroff.c -Lroff.c -u -p -r1.196 -r1.197
--- roff.c
+++ roff.c
@@ -1082,10 +1082,11 @@ roff_cond_sub(ROFF_ARGS)
 	/* Always check for the closing delimiter `\}'. */
 
 	while (NULL != (ep = strchr(ep, '\\'))) {
-		if ('}' != *(++ep))
-			continue;
-		*ep = '&';
-		roff_ccond(r, ln, pos);
+		if ('}' == *(++ep)) {
+			*ep = '&';
+			roff_ccond(r, ln, ep - *bufp - 1);
+		}
+		++ep;
 	}
 	return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
 }
@@ -1100,13 +1101,13 @@ roff_cond_text(ROFF_ARGS)
 	rr = r->last->rule;
 	roffnode_cleanscope(r);
 
-	ep = &(*bufp)[pos];
-	for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
-		ep++;
-		if ('}' != *ep)
-			continue;
-		*ep = '&';
-		roff_ccond(r, ln, pos);
+	ep = *bufp + pos;
+	while (NULL != (ep = strchr(ep, '\\'))) {
+		if ('}' == *(++ep)) {
+			*ep = '&';
+			roff_ccond(r, ln, ep - *bufp - 1);
+		}
+		++ep;
 	}
 	return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
 }
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