Document:     XCLIB

Purpose:      XCLIB is the extended C library. It contains some of the
              ANSI library functions which are not available on some
              operating systems.

File:         xclib.dc3

Author:       K.G. Begeman

Description:  On some operating systems the ANSI C library routines are
              not available or have a non standard name. Some of the
              missing routines are supplied however in XCLIB. This
              document describes which routines are available. This means
              that routines NOT mentioned in this document might NOT
              be used by level 1 and level 2 programmers. This also
              means that the standard ANSI C include files can not be
              used. Therefore the GIPSY programming group supplies its
              own version of the include files. They contain only routines
              which YOU as a programmer are allowed to use. These include
              files are:

              assert.h            math.h           stdlib.h
              ctype.h             signal.h         string.h
              errno.h             stdarg.h         time.h
              float.h             stddef.h
              limits.h            stdio.h

              This implicates that the include files provided by the
              operating system cannot be used. These include files are
              stored under UPDATE, and you must refer to them in your
              source with #include "stdio.h" instead of #include <stdio.h>.

Warning:      System dependent! At the moment implemented for ALLIANT,
              CONVEX, DEC ULTRIX, HP 9000, SUN and DEC VMS.

Updates:      Feb 13, 1990: KGB, Document created.
              May 14, 1990: JPT, Refereed.
              Jun  4, 1991: KGB, strftime implemented, mktime corrected.
              Jul 20, 1991: KGB, signal and raise implemented.
              Oct  6, 1994: KGB, bug in signal_x removed.
              Feb  9, 1999: JPT, workaround for Linux ecvt() bug.
              May  4, 2007: JPT, define stub when there is nothing to compile.