ft_strtrim.c

Go to the documentation of this file.

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rmikhayl <rmikhayl@student.42london.c      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/12/17 17:25:26 by rmikhayl          #+#    #+#             */
/*   Updated: 2023/12/17 17:25:26 by rmikhayl         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
/* *************************** ft_strtrim *********************************** */
/*   Trims leading and trailing characters from 's1' that match any character */
/*   in 'set.' Returns a new string with trimmed content or NULL if memory    */
/*   allocation fails.                                                        */
/*                                                                            */
/*   In layman's terms: It's like removing certain characters from the        */
/*   beginning and end of a sentence, creating a new sentence without them.   */
/*   If something goes wrong during this process, you get nothing.            */
/* ************************************************************************** */
 
static int  ft_char_in_set(char c, char const *set)
{
    size_t  i;
 
    i = 0;
    while (set[i])
    {
        if (set[i] == c)
            return (1);
        i++;
    }
    return (0);
}
 
char    *ft_strtrim(char const *s1, char const *set)
{
    char    *str;
    size_t  i;
    size_t  start;
    size_t  end;
 
    if (!s1 || !set)
        return (NULL);
    start = 0;
    while (s1[start] && ft_char_in_set(s1[start], set))
        start++;
    end = ft_strlen(s1);
    while (end > start && ft_char_in_set(s1[end - 1], set))
        end--;
    str = (char *)malloc(sizeof(*s1) * (end - start + 1));
    if (!str)
        return (NULL);
    i = 0;
    while (start < end)
        str[i++] = s1[start++];
    str[i] = 0;
    return (str);
}