From: Zachary T Welch <zw@superlucidity.net>
Date: Wed, 11 Nov 2009 07:10:26 +0000 (-0800)
Subject: fix 'jtag interface' behavior
X-Git-Tag: v0.4.0-rc1~824
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=5e1b500b173c7abaf9b78e32d31140c1bd4ba090;p=openocd

fix 'jtag interface' behavior

Without this patch, running "openocd -c 'jtag interface'" segfaults.
Now, it returns the string "undefined" when the interface is unset.
---

diff --git a/src/jtag/tcl.c b/src/jtag/tcl.c
index 71efc8b5..b86e006a 100644
--- a/src/jtag/tcl.c
+++ b/src/jtag/tcl.c
@@ -422,7 +422,8 @@ static int jim_jtag_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 			Jim_WrongNumArgs(goi.interp, 1, goi.argv-1, "(no params)");
 			return JIM_ERR;
 		}
-		Jim_SetResultString(goi.interp, jtag_interface->name, -1);
+		const char *name = jtag_interface ? jtag_interface->name : NULL;
+		Jim_SetResultString(goi.interp, name ? : "undefined", -1);
 		return JIM_OK;
 	case JTAG_CMD_INIT:
 		if (goi.argc != 0) {