gnl_utils.c

#include "cub3d.h"

int	ft_strlen(char *str)
{
	int	i;

	i = 0;
	while (str[i] != '\0')
		i++;
	return (i);
}

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

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

char	*ft_strdup(char *src)
{
	char	*dest;
	int		i;

	dest = malloc(ft_strlen(src) * sizeof(char) + 1);
	if (!dest)
		return (0);
	i = 0;
	while (src[i] != '\0')
	{
		dest[i] = src[i];
		i++;
	}
	dest[i] = '\0';
	return (dest);
}

int	ft_strchr(char *s, char c)
{
	while (c != *s)
	{
		if (*s == 0)
			return (0);
		s++;
	}
	return (1);
}

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

	if (!s1 || !s2)
		return (0);
	new = (char *)malloc(ft_strlen(s1) + ft_strlen(s2) + 1 * sizeof(char));
	if (!new)
		return (0);
	i = 0;
	j = 0;
	while (s1[i] != '\0')
	{
		new[i] = s1[i];
		i++;
	}
	while (s2[j] != '\0')
	{
		new[i] = s2[j];
		j++;
		i++;
	}
	new[i] = '\0';
	return (new);
}