1 files changed, 118 insertions, 0 deletions
diff --git a/src/ft_u_vars.c b/src/ft_u_vars.c
new file mode 100644
index 0000000..4d10aeb
--- /dev/null
+++ b/src/ft_u_vars.c
@@ -0,0 +1,118 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_u_vars.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 <stdlib.h>
+#include <stdint.h>
+
+#include "ft_f_fail.h"
+#include "ft_s_destroy.h"
+#include "ft_s_lcom.h"
+#include "ft_s_struct.h"
+
+
+static char
+	*ft_set_rva(const char varname[],
+				t_msh *msh)
+{
+	char	*rvarname;
+
+	if (!(rvarname = (char*)malloc((ft_strlen(varname) + 1) * sizeof(char))))
+	{
+		ft_lcom_clear(&msh->curr);
+		ft_s_destroy(msh);
+		ft_fail_alloc(msh);
+	}
+	ft_memcpy((char*)rvarname, (const char*)varname + 1,
+		ft_strlen(varname + 1));
+	ft_strlcpy(rvarname + ft_strlen(varname + 1), "=", 2);
+	return (rvarname);
+}
+
+static char
+	*ft_dup_val(char *p_env,
+				char *rvarname,
+				t_msh *msh)
+{
+	char	*varval;
+
+	if (!(varval = ft_strdup(p_env)))
+	{
+		ft_memdel((void*)&rvarname);
+		ft_lcom_clear(&msh->curr);
+		ft_s_destroy(msh);
+		ft_fail_alloc(msh);
+	}
+	ft_memdel((void*)&rvarname);
+	return (varval);
+}
+
+static char
+	*ft_get_frm_env(char rvarname[],
+					t_msh *msh)
+{
+	char	**p_env;
+	char	*varval;
+
+	p_env = msh->envp;
+	while (*p_env)
+	{
+		if (!ft_strncmp(rvarname, *p_env, ft_strlen(rvarname)))
+		{
+			while (**p_env != '\0' && **p_env != '=')
+				*p_env += 1;
+			if (**p_env == '=')
+				*p_env += 1;
+			varval = ft_dup_val(*p_env, rvarname, msh);
+			return (varval);
+		}
+		p_env += 1;
+	}
+	return (NULL);
+}
+
+/*
+** char *
+** ft_subst_var_value(const char varname[], const t_msh *msh);
+**
+** DESCRIPTION
+** The ft_subst_var_value() function returns
+** a heap-allocated, null-terminated string
+** that may later be free'd containing the
+** value of the variable varname[] including
+** the '$' prefix. NULL is returned if varname[]
+** wasn't found.
+*/
+
+char
+	*ft_subst_var_value(const char varname[],
+						t_msh *msh)
+{
+	/* TODO: check behaviour on empty vars -> "QWE=" */
+	/* TODO: add support for special variables -> "$? $0..." */
+	/* TODO: add support for global variables -> "$hey $nigga..." */
+	char	*varval;
+	char	*rvarname;
+
+	varval = NULL;
+	rvarname = ft_set_rva(varname, msh);
+	if ((varval = ft_get_special()) != NULL)
+	{
+		return (varval);
+	}
+	else
+	{
+		varval = ft_get_frm_env(rvarname, msh);
+		return (varval);
+	}
+	return (NULL);
+}