NAME

       ms_readleapseconds - Read a leap second file into a global buffer

SYNOPSIS

       #include <libmseed.h>

       int  ms_readleapseconds ( char *envvarname );

       int  ms_readleapsecondfile ( char *filename );

DESCRIPTION

       These  functions  read  a leap seconds file and store a list of leap seconds in an internal, global list.
       The leap seconds are used to determine the proper end time of a record (and consquently  a  trace).   The
       use of this facility causes the leap second indication in the fixed section data header to be ignored.

       The  ms_readleapseconds function takes and environment variable name that is expected to contain the name
       of a leap seconds file.  The ms_readleapsecondfile function takes the name of a leap second file.

LEAP SECOND LIST FILE

       The leap second list file is expected to contain a list of  leap  second  times  and  TAI-UTC  difference
       values.  The first column should be time stamps as seconds since the NTP epoch (Jan. 1 1900).  The second
       column should be an integer number of seconds that specify the difference between TAI and UTC.

       Usually the most recent version of this file is available here: https://www.ietf.org/timezones/data/leap-
       seconds.list

RETURN VALUES

       ms_readleapseconds returns the number of leap seconds read on success, -1 on file read errors and -2 when
       the environment variable is not set.

       ms_readleapsecondfile returns the number leap seconds read on success and -1 on errors.

AUTHOR

       Chad Trabant
       IRIS Data Management Center