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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# ENVGETB -- Check whether the named option is set in the environment.
# Return true only if the option is defined in the environment and either has
# no value string (i.e., the existence of the variable is what is significant)
# or a value string which begins with the character 'y' or 'Y'.
bool procedure envgetb (varname)
char varname[ARB]
bool answer
pointer sp, def
int envfind()
begin
call smark (sp)
call salloc (def, SZ_LINE, TY_CHAR)
if (envfind (varname, Memc[def], SZ_LINE) < 0)
answer = false
else {
switch (Memc[def]) {
case 'y', 'Y', EOS:
answer = true
default: # abort not justified
answer = false
}
}
call sfree (sp)
return (answer)
end
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