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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* op.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/17 15:27:22 by charles #+# #+# */
/* Updated: 2020/06/19 17:32:43 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
int eval_op(int fds[2], t_env env, t_path path, t_ast *ast)
{
int status;
int left_fds[2];
int right_fds[2];
int p[2];
left_fds[FDS_READ] = fds[FDS_READ];
left_fds[FDS_WRITE] = MS_NO_FD;
right_fds[FDS_READ] = MS_NO_FD;
right_fds[FDS_WRITE] = fds[FDS_WRITE];
if (ast->op.sep == TAG_PIPE)
{
pipe(p);
left_fds[FDS_WRITE] = p[FDS_WRITE];
right_fds[FDS_READ] = p[FDS_READ];
}
if ((status = eval(left_fds, env, path, ast->op.left)) == -1)
return (-1);
if ((ast->op.sep == TAG_AND && status != 0) ||
(ast->op.sep == TAG_PIPE && status != 0) ||
(ast->op.sep == TAG_OR && status == 0))
return (status);
return (eval(right_fds, env, path, ast->op.right));
}
int wrapped_eval(void *void_param)
{
t_fork_param_parent *param;
param = void_param;
return (eval(param->fds, param->env, param->path, param->ast));
}
int eval_parent(int fds[2], t_env env, t_path path, t_ast *ast)
{
t_fork_param_parent param;
if (!redir_extract(ast->redirs, env, fds))
{
ast->redirs = NULL;
return (-1);
}
param.fds[0] = fds[0];
param.fds[1] = fds[1];
param.env = env;
param.path = path;
ast->tag ^= AST_PARENT;
param.ast = ast->parent_ast;
return (fork_wrap(fds, ¶m, wrapped_eval));
}
int eval(int fds[2], t_env env, t_path path, t_ast *ast)
{
if (ast->tag == AST_PARENT)
return (eval_parent(fds, env, path, ast));
if (ast->tag == AST_OP)
return (eval_op(fds, env, path, ast));
if (ast->tag == AST_CMD)
return (eval_cmd(fds, env, path, ast));
return (-1);
}
|
