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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* eval.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/04/01 17:05:21 by charles #+# #+# */
/* Updated: 2020/04/01 23:15:16 by charles ### ########.fr */
/* */
/* ************************************************************************** */
/*
** \file eval.c
** \brief Evaluation of an AST
*/
#include "eval.h"
/*
** \brief Evaluate a line
** \param state State of the evaluation
** \param line Line to evaluate
** \return Last Executed command status or -1 on error
*/
static int eval_line(t_eval_state *state, t_line *line)
{
int status;
if (line->right == NULL)
return (eval(state, line->left));
if ((status = eval(state, line->left)) == -1)
return (-1);
if ((line->sep == SEP_AND && status != 0) ||
(line->sep == SEP_OR && status == 0))
return (status);
return (eval(state, line->right));
}
/*
** \brief Evaluate a command
** \param state Evaluation state
** \param cmd Command to evaluate
** \return Executable status or -1 on error
*/
static int eval_cmd(t_eval_state *state, t_cmd *cmd)
{
int child_pid;
char *exec_path;
bool is_builtin;
is_builtin = builtin_check_exec_name(cmd->argv[0]); // no fork if builtin
if (!is_builtin)
{
if ((exec_path = exec_search_path(state->path,
env_search(state->env, "PATH"), cmd->argv[0])) == NULL)
return (-1);
}
pipe_setup_parent(cmd, state->pipe_in, state->pipe_out);
if ((child_pid = fork()) == -1)
return (-1);
if (child_pid == 0)
{
pipe_setup_child(state->pipe_in, state->pipe_out);
if (is_builtin)
exit(builtin_dispatch_run(cmd->argv, state->env));
else if (execve(exec_path, cmd->argv, NULL) == -1)
exit(EXIT_FAILURE);
exit(EXIT_SUCCESS);
}
wait(&child_pid);
return (WEXITSTATUS(child_pid));
}
/*
** \brief Evaluate an AST
** \param state State of the evaluation
** \param ast Abstract syntax tree to evaluate
** \return Executable status or -1 on error
*/
int eval(t_eval_state *state, t_ast *ast)
{
errno = 0;
if (ast->tag == TAG_LINE)
return (eval_line(state, &ast->data.line));
if (ast->tag == TAG_CMD)
return (eval_cmd(state, &ast->data.cmd));
return (-1);
}
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