@param fai Pointer to the faidx_t struct
@param reg Region in the format "chr2:20,000-30,000"
@param len Length of the region; -2 if seq not present, -1 general error
@return Pointer to the quality string; null on failure
The returned quality string is allocated by malloc() family and should be
destroyed by end users by calling free() on it.
Region names can be quoted with curly braces, as for fai_fetch().
@param fai Pointer to the faidx_t struct @param reg Region in the format "chr2:20,000-30,000" @param len Length of the region; -2 if seq not present, -1 general error @return Pointer to the quality string; null on failure
The returned quality string is allocated by malloc() family and should be destroyed by end users by calling free() on it.
Region names can be quoted with curly braces, as for fai_fetch().