1 files changed, 125 insertions, 0 deletions
diff --git a/src/format_string.c b/src/format_string.c
new file mode 100644
index 0000000..7e64039
--- /dev/null
+++ b/src/format_string.c
@@ -0,0 +1,125 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   format_string.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: chuhlig <chuhlig@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/12/17 19:30:11 by chuhlig           #+#    #+#             */
+/*   Updated: 2025/01/19 20:24:05 by chuhlig          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "get_next_line.h"
+#include "libft.h"
+#include "minishell.h"
+
+void	append_var_exit_code(char **dst, t_env *env)
+{
+	char	*exit_code;
+	char	*result;
+
+	exit_code = env_get(env, "?");
+	if (exit_code)
+	{
+		result = ft_strjoin(*dst, exit_code);
+		free(*dst);
+		*dst = result;
+	}
+}
+
+static void	append_slice(char **dst, char *src, int start, int end)
+{
+	char	*result;
+	int		len;
+	int		i;
+
+	if (*dst != NULL)
+		len = ft_strlen(*dst);
+	else
+		len = 0;
+	result = malloc(len + (end - start) + 1);
+	if (!result)
+		return ;
+	ft_strncpy(result, *dst, len);
+	i = 0;
+	while (start + i < end)
+	{
+		result[len + i] = src[start + i];
+		i++;
+	}
+	result[len + i] = '\0';
+	if (*dst != NULL)
+		free(*dst);
+	*dst = result;
+}
+
+static void	append_var(char **dst, char *src, int *pos, t_env *env)
+{
+	int		i;
+	char	*var;
+	char	*value;
+	char	*result;
+
+	i = 0;
+	*pos += 1;
+	while (ft_isalnum(src[*pos + i]) || src[*pos + i] == '_')
+		i++;
+	if (i == 0)
+		return ;
+	var = ft_substr(src, *pos, i);
+	value = env_get(env, var);
+	if (value)
+	{
+		result = ft_strjoin(*dst, value);
+		free(*dst);
+		*dst = result;
+	}
+	*pos += i;
+	free(var);
+}
+
+static void	handle_dollar_sign(char **result, char *str, int *pos, t_env *env)
+{
+	if (str[*pos + 1] == '?')
+	{
+		append_var_exit_code(result, env);
+		*pos += 2;
+	}
+	else if (ft_isalnum(str[*pos + 1]) || str[*pos + 1] == '_')
+		append_var(result, str, pos, env);
+	else
+	{
+		append_slice(result, str, *pos, *pos + 1);
+		(*pos)++;
+	}
+}
+
+char	*format_string(char *str, t_env *env, int is_literal)
+{
+	char	*result;
+	int		pos;
+	int		start;
+
+	pos = 0;
+	start = 0;
+	result = NULL;
+	if (!str)
+		return (NULL);
+	while (str[pos])
+	{
+		if (str[pos] == '\'' || (str[pos] == '\"' && !is_literal)
+			|| (str[pos] == '$' && !is_literal))
+		{
+			append_slice(&result, str, start, pos);
+			if (str[pos] == '$')
+				handle_dollar_sign(&result, str, &pos, env);
+			else
+				is_literal ^= (str[pos++] == '\'');
+			start = pos;
+			continue ;
+		}
+		pos++;
+	}
+	return (append_slice(&result, str, start, pos), result);
+}