CLI: Fix remote console completion.

Duplicate checking was done incorrectly when parsing completion options
from a remote console causing all options to be ignored as duplicates.
Once fixed I had to separate processing of the best match to ensure it
was not identified as a duplicate when it is the only match.

ASTERISK-27465

Change-Id: Ibbdb29f88211742071836c9b3f4d2aa1221cd0f9

main/asterisk.c

@@ -3012,19 +3012,26 @@ static char *cli_prompt(EditLine *editline)
 static struct ast_vector_string *ast_el_strtoarr(char *buf)
 {
 	char *retstr;
+	char *bestmatch;
 	struct ast_vector_string *vec = ast_calloc(1, sizeof(*vec));
 
 	if (!vec) {
 		return NULL;
 	}
 
+	/* bestmatch must not be deduplicated */
+	bestmatch = strsep(&buf, " ");
+	if (!bestmatch || !strcmp(bestmatch, AST_CLI_COMPLETE_EOF)) {
+		goto vector_cleanup;
+	}
+
 	while ((retstr = strsep(&buf, " "))) {
 		if (!strcmp(retstr, AST_CLI_COMPLETE_EOF)) {
 			break;
 		}
 
 		/* Older daemons sent duplicates. */
-		if (AST_VECTOR_GET_CMP(vec, retstr, strcasecmp)) {
+		if (AST_VECTOR_GET_CMP(vec, retstr, !strcasecmp)) {
 			continue;
 		}
 
@@ -3036,7 +3043,9 @@ static struct ast_vector_string *ast_el_strtoarr(char *buf)
 		}
 	}
 
-	if (!AST_VECTOR_SIZE(vec)) {
+	bestmatch = ast_strdup(bestmatch);
+	if (!bestmatch || AST_VECTOR_INSERT_AT(vec, 0, bestmatch)) {
+		ast_free(bestmatch);
 		goto vector_cleanup;
 	}