minishell/expand_utils1.c at master · yuchi1025/minishell · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   expand_utils1.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: yucchen <yucchen@student.42singapore.sg    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/07 12:28:56 by sileow            #+#    #+#             */
/*   Updated: 2026/01/11 16:01:13 by yucchen          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "expand.h"

char	*str_append_char(char *s, char c)
{
	char	*append;
	char	temp[2];

	temp[0] = c;
	temp[1] = '\0';
	append = ft_strjoin(s, temp);
	free(s);
	if (!append)
		return (NULL);
	return (append);
}

char	*str_append_str(char *s1, char *s2)
{
	char	*append;

	if (!s2)
		return (s1);
	append = ft_strjoin(s1, s2);
	free(s1);
	if (!append)
		return (NULL);
	return (append);
}

void	update_q_status(char c, int *q_status)
{
	if (*q_status == 0 && c == '\'')
		*q_status = 1;
	else if (*q_status == 0 && c == '"')
		*q_status = 2;
	else if (*q_status == 1 && c == '\'')
		*q_status = 0;
	else if (*q_status == 2 && c == '"')
		*q_status = 0;
	else
		*q_status += 0;
}

static void	expand_status(char **expand, int *i)
{
	char	*str_status;

	str_status = ft_itoa(g_last_status);
	if (!str_status)
	{
		free(*expand);
		*expand = NULL;
		return ;
	}
	*expand = str_append_str(*expand, str_status);
	free(str_status);
	(*i)++;
}

void	expand_word(const char *src, char **expand, int *i, t_env *env)
{
	int		start;
	char	*key;

	(*i)++;
	if (src[*i] == '?')
		expand_status(expand, i);
	else if (src[*i] && (ft_isalpha(src[*i]) || src[*i] == '_'))
	{
		start = *i;
		while (src[*i] && (ft_isalnum(src[*i]) || src[*i] == '_'))
			(*i)++;
		key = ft_substr(src, start, *i - start);
		if (!key)
		{
			free(*expand);
			*expand = NULL;
			return ;
		}
		*expand = str_append_str(*expand, getenv_value(env, key));
		free(key);
	}
	else
		*expand = str_append_char(*expand, '$');
}