312 lines
6.3 KiB
C
312 lines
6.3 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* exec.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: lderidde <lderidde@student.s19.be> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/01/27 11:22:33 by lderidde #+# #+# */
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/* Updated: 2025/01/29 15:07:44 by lderidde ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "minishell.h"
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void handle_file(t_ast_n *node, int check)
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{
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int fd;
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if (check == 1)
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fd = open(node->infile, O_RDONLY);
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else if (check == 2)
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fd = open(node->outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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else if (check == 3)
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fd = open(node->outfile, O_WRONLY | O_CREAT | O_APPEND, 0666);
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if (fd == -1)
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{
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perror("open");
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exit(1);
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}
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if (check == 1)
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node->_stdin = fd;
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else if (check == 2 || check == 3)
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node->_stdout = fd;
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}
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void handle_redir(t_ast_n *node)
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{
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if (node->redir == _NR)
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return ;
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else if (node->redir == _RED_L)
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handle_file(node, 1);
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else if (node->redir == _RED_R)
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handle_file(node, 2);
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else if (node->redir == _RED_DR)
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handle_file(node, 3);
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if (node->redir == _RED_L)
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{
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dup2(node->_stdin, STDIN_FILENO);
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close(node->_stdin);
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}
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else if (node->redir == _RED_R || node->redir == _RED_DR)
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{
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dup2(node->_stdout, STDOUT_FILENO);
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close(node->_stdout);
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}
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}
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int is_builtin(char *str)
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{
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if (ft_strncmp(str, "exit", 4) == 0)
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return (1);
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else if (ft_strncmp(str, "pwd", 3) == 0)
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return (1);
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else if (ft_strncmp(str, "echo", 4) == 0)
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return (1);
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else if (ft_strncmp(str, "env", 3) == 0)
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return (1);
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else if (ft_strncmp(str, "unset", 5) == 0)
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return (1);
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else if (ft_strncmp(str, "cd", 2) == 0)
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return (1);
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else if (ft_strncmp(str, "export", 6) == 0)
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return (1);
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else
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return (0);
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}
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int exec_builtin(t_ast_n *node)
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{
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handle_redir(node);
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if (ft_strncmp(node->cmd, "exit", 4) == 0)
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return (builtin_exit(node->args, true));
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else if (ft_strncmp(node->cmd, "pwd", 3) == 0)
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return (builtin_pwd(node->args));
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else if (ft_strncmp(node->cmd, "echo", 4) == 0)
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return (builtin_echo(node->args, node->head->env));
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else if (ft_strncmp(node->cmd, "env", 3) == 0)
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return (builtin_env(node->args, node->head->env));
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else if (ft_strncmp(node->cmd, "unset", 5) == 0)
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return (builtin_unset(node->args, node->head));
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else if (ft_strncmp(node->cmd, "cd", 2) == 0)
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return (builtin_cd(node->args, node->head));
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else
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return (builtin_export(node->args, node->head));
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}
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int count_cmds(t_ast_n **pline)
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{
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int i;
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i = 0;
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if (!pline || !*pline)
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return (0);
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while (pline[i])
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i++;
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return (i);
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}
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char *find_path(char *cmd, char **env)
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{
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char *tmp;
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char *path;
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char **paths;
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int i;
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if (access(cmd, F_OK) == 0)
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return (cmd);
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i = 0;
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while (ft_strnstr(env[i], "PATH=", 5) == NULL)
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i++;
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paths = ft_split(env[i] + 5, ":");
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i = -1;
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while (paths[++i])
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{
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tmp = ft_strjoin(paths[i], "/");
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path = ft_strjoin(tmp, cmd);
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free(tmp);
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if (access(path, F_OK) == 0)
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return (free_tab(paths), path);
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free(path);
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}
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free_tab(paths);
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return (NULL);
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}
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void return_error(char *arg, char *msg, int code)
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{
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ft_fprintf(2, "%s: %s\n", arg, msg);
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exit(code);
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}
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int exec(t_ast_n *node)
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{
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char *path;
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handle_redir(node);
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path = find_path(node->cmd, node->head->env);
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if (!path)
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return_error(node->cmd, "command not found", 127);
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if (access(path, X_OK) != 0)
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{
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free(path);
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return_error(path, "Permission denied", 126);
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}
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execve(path, node->args, NULL);
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free(path);
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perror("execve");
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exit(1);
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}
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int exec_scmd(t_ast_n *node)
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{
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pid_t pid;
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int status;
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if (is_builtin(node->cmd))
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return (exec_builtin(node));
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else
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{
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pid = fork();
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if (pid == 0)
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exec(node);
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else if (pid > 0)
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{
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waitpid(pid, &status, 0);
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if (WIFEXITED(status))
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return (WEXITSTATUS(status));
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else
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return (1);
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}
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else
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perror("fork");
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return (1);
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}
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}
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// int *create_pipes(t_ast_n **pline)
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// {
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// int i;
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// int arg;
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// int *pipes;
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//
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// arg = count_cmds(pline);
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// pipes = malloc(2 * (arg - 1) * sizeof(int));
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// if (!pipes)
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// return (NULL);
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// i = -1;
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// while (++i < arg - 1)
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// {
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// pipe(&pipes[2 * i]);
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// }
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// return (pipes);
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// }
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//
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// void close_pipes(int *pipes, int count, bool flag)
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// {
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// int i;
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//
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// i = -1;
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// while (++i < count)
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// {
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// close(pipes[2 * i]);
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// close(pipes[(2 * i) + 1]);
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// }
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// if (flag)
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// free(pipes);
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// }
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int err_fork_pline(int *pipes)
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{
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close(pipes[0]);
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close(pipes[1]);
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perror("fork");
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return (1);
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}
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void exec_pchild(int *pipes, int index, t_ast_n *pcmd, int cmds)
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{
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int ret;
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if (index < cmds - 1)
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dup2(pipes[1], STDOUT_FILENO);
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close(pipes[0]);
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close(pipes[1]);
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if (is_builtin(pcmd->cmd))
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{
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ret = exec_builtin(pcmd);
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exit(ret);
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}
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else
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exec(pcmd);
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}
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int end_pline(pid_t last_pid, t_ast_n **pline)
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{
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int status;
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int i;
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i = -1;
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waitpid(last_pid, &status, 0);
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while (++i < count_cmds(pline) - 1)
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wait(NULL);
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if (WIFEXITED(status))
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return (WEXITSTATUS(status));
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else
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return (1);
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}
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int exec_pline(t_ast_n **pline)
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{
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int i;
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pid_t pid;
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pid_t last_pid;
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int pipes[2];
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i = -1;
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while (pline[++i])
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{
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pipe(pipes);
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pid = fork();
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if (pid == 0)
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exec_pchild(pipes, i, pline[i], count_cmds(pline));
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else if (pid > 0)
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{
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dup2(pipes[0], STDIN_FILENO);
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close(pipes[0]);
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close(pipes[1]);
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if(i == count_cmds(pline) - 1)
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last_pid = pid;
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}
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else if (pid < 0)
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return (err_fork_pline(pipes));
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}
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return (end_pline(last_pid, pline));
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}
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int execute_command(t_ast_n *node)
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{
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int status;
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if (node->state == _CMD)
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return (exec_scmd(node));
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else if (node->state == _AND)
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{
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status = execute_command(node->left);
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if (status == 0)
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return (execute_command(node->right));
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return (status);
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}
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else if (node->state == _OR)
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{
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status = execute_command(node->left);
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if (status != 0)
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return (execute_command(node->right));
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return (status);
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}
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else if (node->state == _PLINE)
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return (exec_pline(node->pline));
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return (0);
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}
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