[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Configuration environment variables should be dialect specific yet backward compatible. (#314)

[Eliot Miranda]

In  the unix variant (& hence the Mac variant), there are many environment variables that can specify such things as
    SQUEAK_PLUGINS
    SQUEAK_ENCODING
    SQUEAK_PATHENC
    SQUEAK_TEXTENC
    SQUEAK_VM
First these should be dialect-specific (PHARO_PLUGINS CUIS_PLUGINS NEWSPEAK_PLUGINS etc), and for backward-compatibility the Squeak specific names should remain functional.  So all VM environment variable access should be though a routine, somewhat like

  if ((ev = getvmenvvar("PLUGINS")))	squeakPlugins = strdup(ev);

where getvmenvvar is something like

char *
getvmenvvar(const char *var)
{
    char varname[64];
    char *value;
#if PHARO_VM
# define VM_VAR_PREFIX "PHARO_"
#elif CUIS_VM
# define VM_VAR_PREFIX "CUIS_"
#elif NEWSPEAK_VM
# define VM_VAR_PREFIX "NEWSPEAK_"
#endif
#if defined(VM_VAR_PREFIX)
    strcpy(varname,VM_VAR_PREFIX);
    strcat(varname,var);
    if ((value = getenv(varname))
        return value;
#endif
    /* now the default prefix */
    strcpy(varname,"SQUEAK_");
    strcat(varname,var);
    return getenv(varname);
}

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