@param b Pointer to the bam record @param tag Desired aux tag @param s The kstring to write to.
@return 1 on success, 0 on no tag found with errno = ENOENT, -1 on error (errno will be either EINVAL or ENOMEM).
See Implementation
@param b Pointer to the bam record @param tag Desired aux tag @param s The kstring to write to.
@return 1 on success, 0 on no tag found with errno = ENOENT, -1 on error (errno will be either EINVAL or ENOMEM).