1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* expression library
*/
#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;
}
|
