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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* op.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/17 15:27:22 by charles #+# #+# */
/* Updated: 2020/06/17 17:03:48 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
// TODO: add parent tag on first operation of parent to fork
int eval_op(int fds[2], t_env env, t_path path, t_op *op)
{
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 (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, op->left)) == -1)
return (-1);
if ((op->sep == TAG_AND && status != 0) ||
(op->sep == TAG_PIPE && status != 0) ||
(op->sep == TAG_OR && status == 0))
return (status);
return (eval(right_fds, env, path, op->right));
}
int eval(int fds[2], t_env env, t_path path, t_ast *ast)
{
if (ast->tag == AST_OP)
return (eval_op(fds, env, path, &ast->op));
if (ast->tag == AST_CMD)
return (eval_cmd(fds, env, path, ast));
return (-1);
}
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