6bc2eab19b
Now redirections work. > redirects to a file < reads the content of a file and set it to the input of a command >> append the output of a command into a file
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* redirections.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: sede-san <sede-san@student.42madrid.com +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2026/02/12 00:00:00 by sede-san #+# #+# */
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/* Updated: 2026/02/12 00:00:00 by sede-san ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "executor.h"
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#include <errno.h>
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static int open_redirection_target(
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const t_redirection *redirection
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)
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{
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if (redirection->type == TOKEN_REDIRECT_IN)
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return (open(redirection->target, O_RDONLY));
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if (redirection->type == TOKEN_REDIRECT_OUT)
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return (open(redirection->target, O_WRONLY | O_CREAT | O_TRUNC, 0644));
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if (redirection->type == TOKEN_APPEND)
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return (open(redirection->target, O_WRONLY | O_CREAT | O_APPEND, 0644));
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errno = EINVAL;
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return (-1);
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}
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static bool backup_stream_if_needed(
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const t_redirection *redirection,
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int *saved_stdin,
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int *saved_stdout
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)
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{
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if (redirection->type == TOKEN_REDIRECT_IN && saved_stdin != NULL
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&& *saved_stdin == -1)
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{
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*saved_stdin = dup(STDIN_FILENO);
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if (*saved_stdin == -1)
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return (perror("dup"), false);
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}
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if ((redirection->type == TOKEN_REDIRECT_OUT
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|| redirection->type == TOKEN_APPEND) && saved_stdout != NULL
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&& *saved_stdout == -1)
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{
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*saved_stdout = dup(STDOUT_FILENO);
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if (*saved_stdout == -1)
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return (perror("dup"), false);
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}
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return (true);
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}
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bool executor_apply_redirections(
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const t_command *command,
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int *saved_stdin,
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int *saved_stdout
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)
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{
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t_list *node;
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t_redirection *redirection;
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int fd;
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if (saved_stdin != NULL)
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*saved_stdin = -1;
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if (saved_stdout != NULL)
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*saved_stdout = -1;
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if (command == NULL || command->redirections == NULL)
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return (true);
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node = command->redirections;
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while (node != NULL)
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{
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redirection = (t_redirection *)node->content;
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if (redirection == NULL || redirection->target == NULL)
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return (false);
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if (!backup_stream_if_needed(redirection, saved_stdin, saved_stdout))
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return (false);
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fd = open_redirection_target(redirection);
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if (fd == -1)
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return (perror(redirection->target), false);
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if (redirection->type == TOKEN_REDIRECT_IN
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&& dup2(fd, STDIN_FILENO) == -1)
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return (close(fd), perror("dup2"), false);
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if ((redirection->type == TOKEN_REDIRECT_OUT
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|| redirection->type == TOKEN_APPEND)
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&& dup2(fd, STDOUT_FILENO) == -1)
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return (close(fd), perror("dup2"), false);
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close(fd);
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node = node->next;
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}
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return (true);
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}
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void executor_restore_redirections(
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int saved_stdin,
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int saved_stdout
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)
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{
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if (saved_stdin != -1)
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{
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if (dup2(saved_stdin, STDIN_FILENO) == -1)
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perror("dup2");
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close(saved_stdin);
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}
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if (saved_stdout != -1)
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{
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if (dup2(saved_stdout, STDOUT_FILENO) == -1)
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perror("dup2");
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close(saved_stdout);
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}
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}
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