Function ha_extract_token

src/cli/hook_augment.c:177–211

── pattern → token ────────────────────────────────────────────── * Extract the longest identifier-like run ([A-Za-z_][A-Za-z0-9_]*) of at * least HA_MIN_TOKEN chars. Pure-identifier output means it is always safe * to embed in a regex (name_pattern) with no escaping. Returns false when * the pattern has no usable token (path globs, short/regex-only patterns) — * the caller then no-ops, which

 * the pattern has no usable token (path globs, short/regex-only patterns) —
 * the caller then no-ops, which keeps the common cheap case cheap. */
static bool ha_extract_token(const char *pattern, char *out, size_t out_sz) {
    if (!pattern) {
        return false;
    }
    size_t best_start = 0;
    size_t best_len = 0;
    size_t i = 0;
    while (pattern[i]) {
        if (isalpha((unsigned char)pattern[i]) || pattern[i] == '_') {
            size_t start = i;
            while (pattern[i] && (isalnum((unsigned char)pattern[i]) || pattern[i] == '_')) {
                i++;
            }
            size_t len = i - start;
            if (len > best_len) {
                best_len = len;
                best_start = start;
            }
        } else {
            i++;
        }
    }
    if (best_len < HA_MIN_TOKEN) {
        return false;
    }
    if (best_len > HA_MAX_TOKEN) {
        best_len = HA_MAX_TOKEN;
    }
    if (best_len + 1 > out_sz) {
        best_len = out_sz - 1;
    }
    memcpy(out, pattern + best_start, best_len);
    out[best_len] = '\0';
    return true;
}

/* ── JSON helpers ─────────────────────────────────────────────────── */