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..bd7f703
--- /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: 2024/12/17 19:31:54 by chuhlig          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "get_next_line.h"
+#include "libft.h"
+#include "minishell.h"
+
+static void	append_slice(char **dst, char *src, int start, int end);
+static void	append_var(char **dst, char *src, int *pos, t_env *env);
+
+enum		e_format_mode
+{
+	LITERAL = 1,
+	VARIABLE = 2,
+};
+
+char	*format_string(char *str, t_env *env)
+{
+	char	*result;
+	int		pos;
+	int		start;
+	int		mode;
+
+	pos = 0;
+	start = 0;
+	mode = 0;
+	result = NULL;
+	if (str == NULL)
+		return (NULL);
+	while (str[pos] != '\0')
+	{
+		if (str[pos] == '\'')
+		{
+			append_slice(&result, str, start, pos);
+			start = pos + 1;
+			mode ^= LITERAL;
+		}
+		if (str[pos] == '"' && !(mode & LITERAL))
+		{
+			append_slice(&result, str, start, pos);
+			start = pos + 1;
+		}
+		if (str[pos] == '$' && !(mode & LITERAL))
+		{
+			append_slice(&result, str, start, pos);
+			append_var(&result, str, &pos, env);
+			start = pos;
+			continue ;
+		}
+		pos++;
+	}
+	append_slice(&result, str, start, pos);
+	return (result);
+}
+
+static void	append_slice(char **dst, char *src, int start, int end)
+{
+	char	*result;
+	int		len;
+	int		i;
+
+	if (*dst != NULL)
+		len = ft_strlen(*dst);
+	else
+	{
+		len = 0;
+	}
+	result = malloc(len + (end - start) + 1);
+	if (!result)
+		return ;
+	ft_strncpy(result, *dst, len);
+	i = 0;
+	while (start + i < end)
+	{
+		result[len + i] = src[start + i];
+		i++;
+	}
+	result[len + i] = '\0';
+	if (*dst != NULL)
+		free(*dst);
+	*dst = result;
+}
+
+static void	append_var(char **dst, char *src, int *pos, t_env *env)
+{
+	int		i;
+	char	*var;
+	char	*value;
+	char	*result;
+
+	i = 0;
+	*pos += 1;
+	while (src[*pos + i] != '\0' && src[*pos + i] != '\'' && src[*pos
+		+ i] != '"' && src[*pos + i] != '$')
+	{
+		i++;
+	}
+	var = malloc(i + 1);
+	if (var == NULL)
+		return ;
+	var[i] = '\0';
+	i--;
+	while (i >= 0)
+	{
+		var[i] = src[*pos + i];
+		i--;
+	}
+	value = env_get(env, var);
+	if (value != NULL)
+	{
+		result = ft_strjoin(*dst, value);
+		free(*dst);
+		*dst = result;
+	}
+	*pos += ft_strlen(var);
+}