Normed the fd function of stdme

stdme/src/fs/fd.c

@@ -0,0 +1,104 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   fd.c                                               :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/07/30 16:17:17 by rparodi           #+#    #+#             */
+/*   Updated: 2024/07/30 16:23:47 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "me/fs/fs.h"
+#include "me/mem/mem.h"
+#include "me/str/str.h"
+#include "me/types.h"
+#include "unistd.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+t_fd	*open_fd(t_str name, t_fd_perm perms, t_file_open_option open_options,
+			t_file_perm file_perm)
+{
+	t_fd				*fd;
+	struct s_file_slot	*slot;
+	int					actual_perms;
+
+	if (perms & FD_READ && perms & FD_WRITE)
+		actual_perms = O_RDWR;
+	else if (perms & FD_READ)
+		actual_perms = O_RDONLY;
+	else if (perms & FD_WRITE)
+		actual_perms = O_WRONLY;
+	else
+		return (NULL);
+	actual_perms |= open_options;
+	slot = get_unused_fd_slot();
+	fd = &slot->slot.fd;
+	fd->fd = open(name, actual_perms, file_perm);
+	if (fd->fd == -1)
+		return (fd->fd = 0, NULL);
+	slot->ty = SLOT_FD;
+	fd->name = str_clone(name);
+	fd->perms = perms;
+	fd->type = FD_FILE;
+	return (fd);
+}
+
+t_error	read_fd(t_fd *fd, t_u8 *buffer, t_usize size, t_isize *read_count)
+{
+	t_isize	ret;
+	t_isize	false_ret;
+
+	if (read_count == NULL)
+		read_count = &false_ret;
+	if (fd == NULL || buffer == NULL || fd->fd == -1 || \
+		!(fd->perms & FD_READ))
+		return (ERROR);
+	ret = read(fd->fd, buffer, size);
+	if (ret == -1)
+		return (ERROR);
+	*read_count = ret;
+	return (NO_ERROR);
+}
+
+t_error	write_fd(t_fd *fd, t_u8 *buffer, t_usize size, t_isize *write_count)
+{
+	t_isize	ret;
+	t_isize	fake_ret;
+
+	if (write_count == NULL)
+		write_count = &fake_ret;
+	if (fd == NULL || buffer == NULL || fd->fd == -1 || !(fd->perms & FD_WRITE))
+		return (ERROR);
+	ret = write(fd->fd, buffer, size);
+	if (ret == -1)
+		return (ERROR);
+	*write_count = ret;
+	return (NO_ERROR);
+}
+
+t_error	stat_fd(t_fd *fd, t_stat *stat)
+{
+	if (fd == NULL || stat == NULL || fd->fd == -1)
+		return (ERROR);
+	if (fstat(fd->fd, stat) == -1)
+		return (ERROR);
+	return (NO_ERROR);
+}
+
+void	close_fd(t_fd *fd)
+{
+	struct s_file_slot	*slot;
+
+	if (fd == NULL)
+		return ;
+	if (close(fd->fd) == -1)
+		return ;
+	slot = (void *)(fd)-offsetof(struct s_file_slot, slot.fd);
+	mem_set_zero(slot, sizeof(*slot));
+}