file_io.c

#include "header.h"
/**
 * read_textfile - reads a text file and prints it to the POSIX stdout
 * @filename: the file
 * @letters: number of letters to print
 *
 * Return: actual number of letters it could read and print
 */
ssize_t read_textfile(char *filename, size_t letters)
{
	int fd;
	ssize_t letters2;
	char *buffer;

	fd = open(filename, O_RDONLY);
	if (fd == -1)
		return (0);

	buffer = malloc(sizeof(char) * letters);
	if (buffer == NULL)
		return (0);

	if (read(fd, buffer, letters) == -1)
	{
		free(buffer);
		return (0);
	}

	letters2 = _strlen(buffer);
	letters2 = write(STDOUT_FILENO, buffer, letters2);
	if (letters2 == -1)
	{
		free(buffer);
		return (0);
	}

	free(buffer);

	return (close(fd) == -1 ? -1 : letters2);
}

/**
 * trunc_text_to_file - appends text to the end of a file
 * @filename: name of file to have text appended to
 * @text_content: text to be appended to the file
 *
 * Return: 1 on success, -1 on failure
 */
int trunc_text_to_file(char *filename, char *text_content)
{
	int fd;
	size_t len;

	fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0600);
	if (fd == -1)
		return (-1);

	if (text_content == NULL)
		return (close(fd) == -1 ? -1 : 1);

	len = _strlen(text_content);

	if (write(fd, text_content, len) == -1)
	{
		close(fd);
		return (-1);
	}

	return (close(fd) == -1 ? -1 : 1);
}

/**
 * append_text_to_file - appends text to the end of a file
 * @filename: name of file to have text appended to
 * @text_content: text to be appended to the file
 *
 * Return: 1 on success, -1 on failure
 */
int append_text_to_file(char *filename, char *text_content)
{
	int fd;
	size_t len;

	fd = open(filename, O_CREAT | O_WRONLY | O_APPEND, 0666);
	if (fd == -1)
		return (-1);

	if (text_content == NULL)
		return (close(fd) == -1 ? -1 : 1);

	len = _strlen(text_content);

	if (write(fd, text_content, len) == -1)
	{
		close(fd);
		return (-1);
	}

	return (close(fd) == -1 ? -1 : 1);
}