ev_exist_var()

EV_$EXIST_VAR                     Domain/OS                      EV_$EXIST_VAR


NAME
     ev_$exist_var - test an environment variable

SYNOPSIS (C)
     #include <apollo/base.h>
     #include <apollo/ev.h>

     boolean ev_$exist_var(
          char *variable_name,
          short &name_length)

SYNOPSIS (Pascal)
     %include '/sys/ins/base.ins.pas';
     %include '/sys/ins/ev.ins.pas';

     function ev_$exist_var(
          in variable_name: univ ev_$string_t;
          in name_length: integer): boolean;

SYNOPSIS (FORTRAN)
     %include '/sys/ins/base.ins.ftn'
     %include '/sys/ins/ev.ins.ftn'

           integer*2 name_length
           character variable_name*256
           logical variable_exists

           variable_exists = ev_$exist_var(variable_name, name_length)

DESCRIPTION
     Ev_$exist_var returns true if a variable named variable_name is defined
     in the environment.  It returns false if a variable named variable_name

     variable_name
          The name of the environment variable to test.

     name_length
          The number of bytes in variable_name.
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