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/* $Id: exopen.c,v 1.4 2009/06/03 01:10:52 ellson Exp $ $Revision: 1.4 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
/*
* Glenn Fowler
* AT&T Research
*
* expression library
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef GVDLL
#define _BLD_sfio 1
#endif
#include <exlib.h>
#include <string.h>
/*
* allocate a new expression program environment
*/
Expr_t *exopen(register Exdisc_t * disc)
{
register Expr_t *program;
register Exid_t *sym;
int debug;
if (!(program = newof(0, Expr_t, 1, 0)))
return 0;
program->symdisc.key = offsetof(Exid_t, name);
debug = getenv("VMDEBUG") != 0;
if (!(program->symbols = dtopen(&program->symdisc, Dtset)) ||
!(program->tmp = sfstropen()) ||
!(program->vm =
(debug ? vmopen(Vmdcsbrk, Vmdebug, VM_DBCHECK | VM_DBABORT) :
vmopen(Vmdcheap, Vmbest, 0)))
|| !(program->ve =
(debug ? vmopen(Vmdcsbrk, Vmdebug, VM_DBCHECK | VM_DBABORT) :
vmopen(Vmdcheap, Vmbest, 0)))) {
exclose(program, 1);
return 0;
}
program->vc = program->ve;
program->id = "libexpr:expr";
program->disc = disc;
setcontext(program);
program->file[0] = sfstdin;
program->file[1] = sfstdout;
program->file[2] = sfstderr;
strcpy(program->main.name, "main");
program->main.lex = PROCEDURE;
program->main.index = PROCEDURE;
dtinsert(program->symbols, &program->main);
if (!(disc->flags & EX_PURE))
for (sym = exbuiltin; *sym->name; sym++)
dtinsert(program->symbols, sym);
if ((sym = disc->symbols))
for (; *sym->name; sym++)
dtinsert(program->symbols, sym);
return program;
}
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