err.c

#include "shell.h"

/**
 * errorHandler - prints error message for shell
 * @build: the build vars_t
 */
void errorHandler(vars_t *build)
{
	register int len;
	static char error[BUFSIZE];
	char *ptr, *alpha;

	alpha = itoa(build->count);
	_strcat(error, build->shellName);
	_strcat(error, ": ");
	_strcat(error, alpha);
	_strcat(error, ": ");
	_strcat(error, build->args[0]);
	_strcat(error, getErrorMessage());
	if (build->args[1])
	{
	if (errno != EBADCD)
	_strcat(error, ": ");
	_strcat(error, build->args[1]);
	}
	_strcat(error, "\n");
	ptr = _strchr(error, '\n');
	len = ptr - error;
	write(STDERR_FILENO, error, len + 1);
	free(alpha);
	insertNullByte(error, 0);
}

/**
 * getErrorMessage - matches errno to corresponding string
 * Return: string of error message
 */
char *getErrorMessage(void)
{
	char *str;

	switch (errno)
	{
	case EBADCD:
	str = ": No such file or directory ";
	break;
	case ENOENT:
	str = ": command not found";
	break;
	case ENOSTRING:
	str = ": bad variable name";
	break;
	case EILLEGAL:
	str = ": Illegal number";
	break;
	case EWSIZE:
	str = ": invalid number of arguments";
	break;
	case ENOBUILTIN:
	str = ": type help for a list of built-ins";
	break;
	case EACCES:
	str = ": Permission denied";
	break;
	default:
	str = ": no error number assigned";
	}
	return (str);
}

/**
 * countDigits - count number of digits in a number
 * @num: input number
 * Return: number of digits
 */
unsigned int countDigits(int num)
{
	register int digits = 0;

	while (num > 0)
	{
	digits++;
	num /= 10;
	}
	return (digits);
}

/**
 * itoa - converts integer to string
 * @num: input integer
 * Return: string type of number
 */
char *itoa(unsigned int num)
{
	register int digits = 0;
	char *str;

	digits += countDigits(num);
	str = malloc(sizeof(char) * (digits + 1));
	if (!str)
	{
	perror("Malloc: failed\n");
	exit(errno);
	}
	insertNullByte(str, digits);
	while (num > 0)
	{
	str[digits - 1] = num % 10 + '0';
	num = num / 10;
	digits--;
	}
	return (str);
}