@param s Pointer to the tag data, as returned by bam_aux_get(). @return Pointer to the string, or NULL if the tag was not a string type If the tag is not a string type ('Z' or 'H'), errno is set to EINVAL.
See Implementation
@param s Pointer to the tag data, as returned by bam_aux_get(). @return Pointer to the string, or NULL if the tag was not a string type If the tag is not a string type ('Z' or 'H'), errno is set to EINVAL.