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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libexpr/exopen.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1989-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * Glenn Fowler

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 * AT&T Research

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 *

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 * expression library

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 */

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#include <exlib.h>

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/*

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 * allocate a new expression program environment

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 */

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Expr_t*

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exopen(register Exdisc_t* disc)

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{

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	register Expr_t*	program;

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	register Exid_t*	sym;

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	int			debug;

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	if (!(program = newof(0, Expr_t, 1, 0)))

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		return 0;

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	program->symdisc.key = offsetof(Exid_t, name);

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	debug = getenv("VMDEBUG") != 0;

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	if (!(program->symbols = dtopen(&program->symdisc, Dtset)) ||

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	    !(program->tmp = sfstropen()) ||

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	    !(program->vm = (debug ? vmopen(Vmdcsbrk, Vmdebug, VM_DBCHECK|VM_DBABORT) : vmopen(Vmdcheap, Vmbest, 0))) ||

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	    !(program->ve = (debug ? vmopen(Vmdcsbrk, Vmdebug, VM_DBCHECK|VM_DBABORT) : vmopen(Vmdcheap, Vmbest, 0))))

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	{

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		exclose(program, 1);

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		return 0;

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	}

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	program->id = "libexpr:expr";

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	program->disc = disc;

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	setcontext(program);

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	program->file[0] = sfstdin;

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	program->file[1] = sfstdout;

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	program->file[2] = sfstderr;

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	strcpy(program->main.name, "main");

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	program->main.lex = PROCEDURE;

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	program->main.index = PROCEDURE;

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	dtinsert(program->symbols, &program->main);

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	if (!(disc->flags & EX_PURE))

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		for (sym = exbuiltin; *sym->name; sym++)

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			dtinsert(program->symbols, sym);

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	if (sym = disc->symbols)

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		for (; *sym->name; sym++)

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			dtinsert(program->symbols, sym);

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	return program;

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}

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