Comparison result is always the same

[DimitriPapadopoulos]

This piece of code:

    if (pos >= 0) {
        for (i = pos; pos >= 0; i--) {
            switch (prog[i]) {

is flagged by LGTM.com:

Comparison result is always the same
Comparison is always true because pos >= 0.

Indeed, the comparison should probably involve i instead of pos:

    if (pos >= 0) {
        for (i = pos; i >= 0; i--) {
            switch (prog[i]) {