util_funcs1.c

#include "shell.h"

/**
 * my_strlen - gets the length of a string
 * @str: string to count
 * Return: no of chars in the string
 */
int my_strlen(char *str)
{
	int len;

	for (len = 0; str[len] != '\0'; len++)
		;

	return (len);
}

/**
 * my_strcpy - copies a string to another. destination needs to be malloc'd
 * @destination: container to insert copy
 * @source: string to be copied
 *
 * Return: a pointer to the destination
 */
char *my_strcpy(char *destination, char *source)
{
	int i;

	for (i = 0; source[i] != '\0'; i++)
		destination[i] = source[i];

	destination[i] = '\0';
	return (destination);
}

/**
 * my_strcat - appends source to destination. malloc destination before call
 * @destination: an existing string
 * @source: string to be appended to destination
 * Return: a pointer to the destination
 */
char *my_strcat(char *destination, char *source)
{
	int i, j;

	for (i = 0; destination[i] != '\0'; i++)
		;

	for (j = 0; source[j] != '\0'; j++, i++)
		destination[i] = source[j];

	destination[i] = '\0';

	return (destination);
}

/**
 * my_strcmp - compares two strings
 * @str1: string1
 * @str2: string 2 to compare with
 * Return: int representing if true or not
 */
int my_strcmp(char *str1, char *str2)
{
	int n, d;

	for (n = 0, d = 0; (str1[n] != '\0' || str2[n] != '\0'); n++)
	{
		d = str1[n] - str2[n];
		if (d != 0)
			break;
	}

	if (d < 0)
		return (-1);
	else if (d > 0)
		return (1);

	return (d);
}

/**
 * my_strdup - duplicates a string, allocating the appropriate size to the copy
 * @str: to be duplicated
 *
 * Return: pointer to the duplicated string
 */
char *my_strdup(char *str)
{
	char *dup;
	size_t len;

	len = my_strlen(str);
	dup = malloc(sizeof(char) * (len + 1));
	if (dup == NULL)
		return (NULL);
	my_memcpy(dup, str, len + 1);
	return (dup);
}