err.c

#include "main.h"

int num_len(int num);
char *_itoa(int num);
int create_error(char **args, int err);

char *error_env(char **args);
char *error_1(char **args);
char *error_2_exit(char **args);
char *error_2_cd(char **args);
char *error_2_syntax(char **args);

char *error_126(char **args);
char *error_127(char **args);

/**
 * num_len - Counts the digit length of a number.
 * @num: The number to measure.
 *
 * Return: The digit length.
 */
int num_len(int num)
{
	unsigned int num1;
	int len = 1;

	if (num < 0)
	{
		len++;
		num1 = num * -1;
	}
	else
	{
		num1 = num;
	}
	while (num1 > 9)
	{
		len++;
		num1 /= 10;
	}

	return (len);
}

/**
 * _itoa - Converts an integer to a string.
 * @num: The integer.
 *
 * Return: The converted string.
 */
char *_itoa(int num)
{
	char *buffer;
	int len = num_len(num);
	unsigned int num1;

	buffer = malloc(sizeof(char) * (len + 1));
	if (!buffer)
		return (NULL);

	buffer[len] = '\0';

	if (num < 0)
	{
		num1 = num * -1;
		buffer[0] = '-';
	}
	else
	{
		num1 = num;
	}

	len--;
	do {
		buffer[len] = (num1 % 10) + '0';
		num1 /= 10;
		len--;
	} while (num1 > 0);

	return (buffer);
}


/**
 * create_error - Writes a custom error message to stderr.
 * @args: An array of arguments.
 * @err: The error value.
 *
 * Return: The error value.
 */
int create_error(char **args, int err)
{
	char *error;

	switch (err)
	{
	case -1:
		error = error_env(args);
		break;
	case 1:
		error = error_1(args);
		break;
	case 2:
		if (*(args[0]) == 'e')
			error = error_2_exit(++args);
		else if (args[0][0] == ';' || args[0][0] == '&' || args[0][0] == '|')
			error = error_2_syntax(args);
		else
			error = error_2_cd(args);
		break;
	case 126:
		error = error_126(args);
		break;
	case 127:
		error = error_127(args);
		break;
	}
	write(STDERR_FILENO, error, _strlen(error));

	if (error)
		free(error);
	return (err);

}


/**
 * error_env - Creates an error message for shellby_env errors.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_env(char **args)
{
	char *error, *hist_str;
	int len;

	hist_str = _itoa(hist);
	if (!hist_str)
		return (NULL);

	args--;
	len = _strlen(name) + _strlen(hist_str) + _strlen(args[0]) + 45;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
	{
		free(hist_str);
		return (NULL);
	}

	_strcpy(error, name);
	_strcat(error, ": ");
	_strcat(error, hist_str);
	_strcat(error, ": ");
	_strcat(error, args[0]);
	_strcat(error, ": Unable to add/remove from environment\n");

	free(hist_str);
	return (error);
}

/**
 * error_1 - Creates an error message for shellby_alias errors.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_1(char **args)
{
	char *error;
	int len;

	len = _strlen(name) + _strlen(args[0]) + 13;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
		return (NULL);

	_strcpy(error, "alias: ");
	_strcat(error, args[0]);
	_strcat(error, " not found\n");

	return (error);
}

/**
 * error_2_exit - Creates an error message for shellby_exit errors.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_2_exit(char **args)
{
	char *error, *hist_str;
	int len;

	hist_str = _itoa(hist);
	if (!hist_str)
		return (NULL);

	len = _strlen(name) + _strlen(hist_str) + _strlen(args[0]) + 27;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
	{
		free(hist_str);
		return (NULL);
	}

	_strcpy(error, name);
	_strcat(error, ": ");
	_strcat(error, hist_str);
	_strcat(error, ": exit: Illegal number: ");
	_strcat(error, args[0]);
	_strcat(error, "\n");

	free(hist_str);
	return (error);
}

/**
 * error_2_cd - Creates an error message for shellby_cd errors.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_2_cd(char **args)
{
	char *error, *hist_str;
	int len;

	hist_str = _itoa(hist);
	if (!hist_str)
		return (NULL);

	if (args[0][0] == '-')
		args[0][2] = '\0';
	len = _strlen(name) + _strlen(hist_str) + _strlen(args[0]) + 24;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
	{
		free(hist_str);
		return (NULL);
	}

	_strcpy(error, name);
	_strcat(error, ": ");
	_strcat(error, hist_str);
	if (args[0][0] == '-')
		_strcat(error, ": cd: Illegal option ");
	else
		_strcat(error, ": cd: can't cd to ");
	_strcat(error, args[0]);
	_strcat(error, "\n");

	free(hist_str);
	return (error);
}

/**
 * error_2_syntax - Creates an error message for syntax errors.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_2_syntax(char **args)
{
	char *error, *hist_str;
	int len;

	hist_str = _itoa(hist);
	if (!hist_str)
		return (NULL);

	len = _strlen(name) + _strlen(hist_str) + _strlen(args[0]) + 33;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
	{
		free(hist_str);
		return (NULL);
	}

	_strcpy(error, name);
	_strcat(error, ": ");
	_strcat(error, hist_str);
	_strcat(error, ": Syntax error: \"");
	_strcat(error, args[0]);
	_strcat(error, "\" unexpected\n");

	free(hist_str);
	return (error);
}

/**
 * error_126 - Creates an error message for permission denied failures.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_126(char **args)
{
	char *error, *hist_str;
	int len;

	hist_str = _itoa(hist);
	if (!hist_str)
		return (NULL);

	len = _strlen(name) + _strlen(hist_str) + _strlen(args[0]) + 24;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
	{
		free(hist_str);
		return (NULL);
	}

	_strcpy(error, name);
	_strcat(error, ": ");
	_strcat(error, hist_str);
	_strcat(error, ": ");
	_strcat(error, args[0]);
	_strcat(error, ": Permission denied\n");

	free(hist_str);
	return (error);
}

/**
 * error_127 - Creates an error message for command not found failures.
 * @args: An array of arguments passed to the command.
 *
 * Return: The error string.
 */
char *error_127(char **args)
{
	char *error, *hist_str;
	int len;

	hist_str = _itoa(hist);
	if (!hist_str)
		return (NULL);

	len = _strlen(name) + _strlen(hist_str) + _strlen(args[0]) + 16;
	error = malloc(sizeof(char) * (len + 1));
	if (!error)
	{
		free(hist_str);
		return (NULL);
	}

	_strcpy(error, name);
	_strcat(error, ": ");
	_strcat(error, hist_str);
	_strcat(error, ": ");
	_strcat(error, args[0]);
	_strcat(error, ": not found\n");

	free(hist_str);
	return (error);
}