added basic env & setenv commands

srcs/ms_env.c

@@ -0,0 +1,99 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ms_env.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/01/13 14:44:20 by tmaze             #+#    #+#             */
+/*   Updated: 2019/01/13 19:02:04 by tmaze            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+t_envelem	*elem_new(char *key, char *val)
+{
+	t_envelem	*elem;
+
+	if ((elem = (t_envelem*)ft_memalloc(sizeof(t_envelem))) == NULL)
+		return (NULL);
+	if ((elem->key = ft_strdup(key)) == NULL)
+	{
+		ft_memdel((void**)&elem);
+		return (NULL);
+	}
+	if (val != NULL && (elem->val = ft_strdup(val)) == NULL)
+	{
+		ft_strdel(&(elem->key));
+		ft_memdel((void**)&elem);
+		return (NULL);
+	}
+	elem->val = (val == NULL) ? NULL : elem->val;
+	return (elem);
+}
+
+t_envelem	*env_getelemfromkey(char *key, t_list *env)
+{
+	t_list	*tmp;
+
+	tmp = env;
+	while (tmp)
+	{
+		if (ft_strcmp(((t_envelem*)(tmp->content))->key, key) == 0)
+			return ((t_envelem*)(tmp->content));
+		tmp = tmp->next;
+	}
+	return (NULL);
+}
+
+t_envelem	*env_addupdate(char *key, char *val, t_list **env)
+{
+	t_list		*new;
+	t_envelem	*elem;
+	char		*tmp;
+	
+	if ((elem = env_getelemfromkey(key, *env)) != NULL)
+	{
+		if (val == NULL)
+			tmp = val;
+		else if ((tmp = ft_strdup(val)) == NULL)
+			return (NULL);
+		ft_strdel(&(elem->val));
+		elem->val = tmp;
+		return (elem);
+	}
+	if ((elem = elem_new(key, val)) == NULL
+		|| (new = ft_lstnew(elem, sizeof(t_envelem))) == NULL)
+		return (NULL);
+	ft_lstaddend(env, new);
+	ft_memdel((void**)&elem);
+	return ((t_envelem*)(new->content));
+}
+
+void		env_delelem(char *key, t_list **env)
+{
+	t_list	*tmp;
+	t_list	*prec;
+
+	if (ft_strcmp(((t_envelem*)((*env)->content))->key, key) == 0)
+	{
+		tmp = *env;
+		*env = (*env)->next;
+		ft_lstdelone(&tmp, &ft_lstdelenvelem);
+		return ;
+	}
+	tmp = (*env)->next;
+	prec = (*env);
+	while (tmp)
+	{
+		if (ft_strcmp(((t_envelem*)(tmp->content))->key, key) == 0)
+		{
+			prec->next = tmp->next;
+			ft_lstdelone(&tmp, &ft_lstdelenvelem);
+			return ;
+		}
+		prec = tmp;
+		tmp = tmp->next;
+	}
+}