#ifndef _ERROR_H
#define _ERROR_H

enum {
    ERR_COLON_REQUIRED,
    ERR_NUMBERS_ONLY,
    ERR_EXCEEDS_TOTAL_LINES,
    ERR_OFFSET_EXCEEDS_BOUNDARY,
    ERR_MUST_NOT_BE_NULL
};

static const char *range_errors[] = {
    "colon as range separator required",
    "ranges must be numbers only",
    "starting or ending range must not exceed total lines",
    "starting or ending range negative offset exceeds boundary",
    "starting or ending range must not be 0"
};

#endif /* _ERROR_H */