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/**
** \file eval.c
** \brief Evaluation of an AST
*/
#include "eval.h"
static int eval_line(t_eval_state *state, t_line *line)
{
int status;
if (line->right == NULL)
return (eval(state, line->left));
status = eval(state, line->left);
if ((line->sep == SEP_AND && status != 0) ||
(line->sep == SEP_OR && status == 0))
return (status);
return (eval(state, line->right));
}
static char *search_exec_path(t_path path, char *path_var, char *exec_name)
{
char *exec_path;
// try current first
if ((exec_path = ft_htget(path, exec_name)) == NULL)
{
if (path_update(path, path_var) == NULL)
return (NULL);
if ((exec_path = ft_htget(path, exec_name)) == NULL)
return (NULL);
}
return exec_path;
}
static int eval_cmd(t_eval_state *state, t_cmd *cmd)
{
int child_pid;
char *exec_path;
if ((exec_path = search_exec_path(state->path, ft_htget(state->env, "PATH"), cmd->argv[0])) == NULL)
return (-1);
if (cmd->in != NULL)
{
if ((state->in_pipe[PIPE_WRITE] = open(cmd->in, O_RDONLY)) < 0)
return (-1);
}
if (cmd->out != NULL)
{
if ((state->out_pipe[PIPE_READ] = open(cmd->out,
(cmd->is_append ? O_WRONLY : O_APPEND) | O_CREAT)) < 0)
return (-1);
}
if ((child_pid = fork()) == -1)
return (-1);
if (child_pid == 0)
{
if (state->in_pipe[PIPE_READ] != PIPE_CLOSED)
dup2(STDIN_FILENO, state->in_pipe[PIPE_READ]);
if (state->out_pipe[PIPE_WRITE] != PIPE_CLOSED)
dup2(STDOUT_FILENO, state->out_pipe[PIPE_WRITE]);
if (execve(exec_path, cmd->argv, NULL /*env_array*/) == -1)
exit(EXIT_FAILURE);
}
wait(&child_pid);
return (WEXITSTATUS(child_pid));
}
int eval(t_eval_state *state, t_ast *ast)
{
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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