morestringutils.c

#include "main.h"

/**
 * _strncpy - copy string
 * @dest: pointer to a char variable to be modified
 * @src: pointer to a character variable to be copied
 * @n: length of characters to be copied
 * Description: a function that copies a string.
 * - The function should work exactly like strncpy
 * Return: pointer to @dest
 */
char *_strncpy(char *dest, char *src, int n)
{
	int i;

	if (dest == NULL)
		return (NULL);

	for (i = 0; i < n && src[i] != '\0'; i++)
		dest[i] = src[i];
	for (; i < n; i++)
		dest[i] = '\0';
	return (dest);
}

/**
 * _strcmp - compare two stings
 * @s1: first operand
 * @s2: second operand
 * Description: a function that compares two strings.
 * Return: integer, < or = or > 0
 */
int _strcmp(char *s1, char *s2)
{
	int i;

	if (s1 == NULL || s2 == NULL)
		return (0);

	for (i = 0; s1[i] != '\0' && s2[i] != '\0' && s1[i] == s2[i]; i++)
		;
	return (s1[i] - s2[i]);
}

/**
 * _strdup - Duplicate A String
 * @str: pointer to a string
 *
 * Return: pointer to a string or NULL on failure
 */
char *_strdup(char *str)
{
	size_t len, i;
	char *str2;

	if (str == NULL)
		return (NULL);

	len = _strlen(str);
	str2 = malloc(sizeof(char) * (len + 1));

	if (!str2)
		return (NULL);

	for (i = 0; i <= len; i++)
		str2[i] = str[i];

	return (str2);
}

/**
 * _strncmp - compare n number of characters in two strings
 * @s1: pointer to string 1
 * @s2: pointer to string 2
 * @n: integer, number of strings to compare
 *
 * Return: integer, 0 if they are equal or otherwise
 */
int _strncmp(char *s1, char *s2, int n)
{
	int i;

	if (s1 == NULL || s2 == NULL)
		return (1);
	for (i = 0; i < n && s1[i] && s2[i]; i++)
	{
		if ((s1[i] - s2[i]) != 0 || i == n - 1)
			break;
	}
	return (s1[i] - s2[i]);
}