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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* file.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/17 09:04:03 by cacharle #+# #+# */
/* Updated: 2019/07/17 15:49:06 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include "include.h"
int print_tail(char *filename, int tail_size)
{
char *file;
int fildes;
int file_len;
if ((fildes = open(filename, O_RDONLY)) == -1)
{
close(fildes);
return (-1);
}
file = NULL;
if ((file_len = read_file(fildes, &file)) == -1)
return (-1);
/*printf("%s \n %d", file + 29000, ft_strlen(file));*/
/*for (int i = 0; i < 100; i++)*/
/*printf("%c", file[i]);*/
if (write(STDOUT_FILENO, &file[file_len - tail_size], tail_size) == -1)
return (-1);
free(file);
if (close(fildes) == -1)
return (-1);
return (0);
}
int read_file(int fildes, char **file)
{
size_t size;
size_t read_size;
int file_len;
/**file = malloc(sizeof(char) * 100);*/
file_len = 0;
size = BUF_SIZE;
read_size = BUF_SIZE;
while (!(read_size < BUF_SIZE))
{
/*printf("size %d\n", size);*/
*file = char_realloc(*file, size);
read_size = read(fildes, *file, BUF_SIZE);
/*printf("%s", *file);*/
if (read_size < BUF_SIZE)
file_len += ft_strlen(*file + BUF_SIZE - read_size);
else
file_len += BUF_SIZE;
size += BUF_SIZE;
/*size *= 2;*/
}
printf("file_len %d\n", file_len);
return (file_len);
}
char *char_realloc(char *ptr, int size)
{
int i;
char *reallocated_ptr;
reallocated_ptr = (char*)malloc(sizeof(char) * size);
i = 0;
while (i < size - BUF_SIZE)
{
reallocated_ptr[i] = ptr[i];
i++;
}
reallocated_ptr[i] = '\0';
free(ptr);
return (reallocated_ptr);
}
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