utils2.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   utils2.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: akhalid <akhalid@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/02/25 03:14:41 by akhalid           #+#    #+#             */
/*   Updated: 2022/03/01 16:30:03 by akhalid          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"

int	ft_strlen(char *s)
{
	int	i;

	i = 0;
	if (s)
		while (s[i])
			i++;
	return (i);
}

char	*ft_strdup(char *s1)
{
	char	*dup;
	int		i;

	i = 0;
	if (!s1)
		return (0);
	while (s1[i])
		i++;
	dup = (char *)malloc(i + 1);
	if (dup == NULL)
		return (NULL);
	i = 0;
	while (s1[i] != '\0')
	{
		dup[i] = s1[i];
		i++;
	}
	dup[i] = '\0';
	return (dup);
}

char	*ft_substr(char *s, int start, size_t len)
{
	char	*ss;
	char	*sub;
	int		i;

	if (s && start > ft_strlen(s))
		len = 0;
	ss = (char *)s;
	if (ss)
	{
		sub = (char *)malloc(sizeof(char) * (len + 1));
		if (!sub)
			return (0);
		i = 0;
		while (len--)
			sub[i++] = ss[start++];
		sub[i] = '\0';
		return (sub);
	}
	return (0);
}

char	*ft_strjoin(char *s1, char *s2)
{
	char		*str;
	int			i;
	int			j;

	str = (char *)malloc(ft_strlen(s1) + ft_strlen(s2) + 1);
	if (!s1)
		return (s2);
	if (!s2)
		return (s1);
	if (str == NULL)
		return (NULL);
	i = -1;
	while (s1[++i])
		str[i] = s1[i];
	j = -1;
	while (s2[++j])
	{
		str[i] = s2[j];
		i++;
	}
	str[i] = '\0';
	free(s1);
	free(s2);
	return (str);
}

int	ft_strcmp(char *s1, char *s2)
{
	int	i;

	i = 0;
	if (!s1 || !s2)
		return (1);
	while (s1[i] == s2[i] && s1[i] != '\0' && s2[i] != '\0')
		i++;
	return (s1[i] - s2[i]);
}