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tcl/drscan: handle invalid syntax with a conditional, not assert 

When "drscan" command is used improperly, such as in:
drscan stm32f1x.cpu -endstate drpause
there're no fields to scan, and so the assert leads to a
segfault. This should be treated like any other syntax error instead.

Change-Id: Id1743f5d641038e1e3754c6f3097aabc5d1916b9
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/1927
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Paul Fertser 2014-02-04 16:07:57 +04:00 committed by Spencer Oliver
parent 98b808923f
commit bb0ef230ca
1 changed files with 4 additions and 1 deletions
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5
src/jtag/tcl.c
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@ -169,7 +169,10 @@ static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *args
return JIM_ERR; return JIM_ERR;
num_fields = (argc-2)/2; num_fields = (argc-2)/2;
assert(num_fields > 0); if (num_fields <= 0) {
Jim_SetResultString(interp, "drscan: no scan fields supplied", -1);
return JIM_ERR;
}
fields = malloc(sizeof(struct scan_field) * num_fields); fields = malloc(sizeof(struct scan_field) * num_fields);
for (i = 2; i < argc; i += 2) { for (i = 2; i < argc; i += 2) {
long bits; long bits;