Parsed bin path in $PATH, now time to execve(2)

1 files changed, 106 insertions, 0 deletions

diff --git a/src/ft_e_externs_next.c b/src/ft_e_externs_next.c
new file mode 100644
index 0000000..492d7e5
--- /dev/null
+++ b/src/ft_e_externs_next.c
@@ -0,0 +1,106 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_e_externs_next.c                                :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/02/14 17:19:27 by rbousset          #+#    #+#             */
+/*   Updated: 2020/02/14 17:19:29 by rbousset         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <libft.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <stddef.h>
+
+#include "ft_f_fail.h"
+#include "ft_s_destroy.h"
+#include "ft_s_lcom.h"
+#include "ft_s_struct.h"
+
+static char
+	*ft_get_fullpath(const char *p_path,
+					const char *d_name,
+					t_msh *msh)
+{
+	char			*fullpath;
+	const size_t	path_len = ft_strlen(p_path);
+	const size_t	name_len = ft_strlen(d_name);
+
+	if (!(fullpath = (char*)malloc((path_len + name_len + 2) * sizeof(char))))
+	{
+		ft_lcom_clear(&msh->curr);
+		ft_s_destroy(msh);
+		ft_fail_alloc();
+	}
+	ft_memcpy(fullpath, p_path, path_len);
+	*(fullpath + (path_len)) = '/';
+	ft_memcpy(fullpath + path_len + 1, d_name, name_len);
+	*(fullpath + (path_len + name_len + 1)) = '\0';
+	return (fullpath);
+}
+
+char
+	*ft_search_in_path(const char *com,
+					char **envpath,
+					t_msh *msh)
+{
+	/* TODO: norme */
+	struct dirent	*ent;
+	char			**p_path;
+	char			*fullpath;
+	DIR				*dir;
+
+	(void)com;
+	p_path = envpath;
+	while (*p_path)
+	{
+		if ((dir = opendir(*p_path)) != NULL)
+		{
+			while ((ent = readdir(dir)) != NULL)
+			{
+				/* TODO: check for not bins (dirs, etc) */
+				if (ft_strncmp(com, ent->d_name, ft_strlen(com) + 1) == 0)
+				{
+					fullpath = ft_get_fullpath(*p_path, ent->d_name, msh);
+					closedir(dir);
+					return (fullpath);
+				}
+			}
+			closedir(dir);
+		}
+		p_path++;
+	}
+	return (NULL);
+}
+
+char
+	**ft_get_env_path(t_msh *msh)
+{
+	char	**p_env;
+	char	**envpath;
+	char	*envline;
+
+	p_env = msh->envp;
+	while (*p_env && ft_strncmp("PATH", *p_env, 4) != 0)
+	{
+		p_env++;
+	}
+	if (*p_env == NULL)
+		return (NULL);
+	envline = ft_strchr(*p_env, '=');
+	envline += 1;
+	if (*envline != '\0')
+	{
+		if (!(envpath = ft_split(envline, ':')))
+		{
+			ft_lcom_clear(&msh->curr);
+			ft_s_destroy(msh);
+			ft_fail_alloc();
+		}
+		return (envpath);
+	}
+	return (NULL);
+}