ft_libc_string_locate_and_compare.c

/* ************************************************************************** */
/**//**//*****//**//*   By: *//**//*   Created:   by *//*   Updated:   by *//**/
/* ************************************************************************** */

#include "libft.h"

char	*ft_strchr(const char *s, int c)
{
	while (*s)
	{
		if (*s == (char)c)
			return ((char *)s);
		s++;
	}
	if (c == '\0')
		return ((char *)s);
	return (NULL);
}

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

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

void	*ft_memchr(const void *s, int c, size_t n)
{
	while (n--)
	{
		if (*(unsigned char *)s == (unsigned char)c)
			return ((void *)s);
		s++;
	}
	return (NULL);
}

int	ft_strncmp(const char *s1, const char *s2, size_t n)
{
	while (n--)
	{
		if (*s1 != *s2)
			return (*(unsigned char *)s1 - *(unsigned char *)s2);
		if (*s1 == '\0' || *s2 == '\0')
			break ;
		s1++;
		s2++;
	}
	return (0);
}

int	ft_memcmp(const void *s1, const void *s2, size_t n)
{
	int	diff;

	while (n--)
	{
		diff = *((unsigned char *)s1++) - *((unsigned char *)s2++);
		if (diff)
			return (diff);
	}
	return (0);
}