cub3D/ft_utils_str_1.c

#include "cub3d.h"

size_t	ft_strlen(const char *s)
{
	size_t	i;

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

char	*ft_strdup(const char *src)
{
	char	*cp;
	size_t	i;

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

char	*ft_strjoin(char *left_str, char *buff)
{
	size_t	i;
	size_t	j;
	char	*str;

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

char	*ft_strchr(const char *s, int c)
{
	int	i;

	i = 0;
	if (!s)
		return (0);
	if (c == '\0')
		return ((char *)&s[ft_strlen(s)]);
	while (s[i])
	{
		if (s[i] == (char)c)
			return ((char *)&s[i]);
		i++;
	}
	return (0);
}