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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* helper.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/19 15:19:53 by cacharle #+# #+# */
/* Updated: 2019/07/24 17:59:52 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include "include.h"
/*
** Dynamic allocation of buffer
*/
char *read_file(int fildes)
{
char *buf;
char *file;
int file_size;
int read_size;
int buf_size;
buf_size = INIT_BUF_SIZE;
file_size = 0;
file = NULL;
if ((buf = malloc(sizeof(char) * buf_size)) == NULL)
return (NULL);
while ((read_size = read(fildes, buf, buf_size)))
{
if (read_size < 0)
return (NULL);
if ((file = ft_memcat(file, buf, file_size, read_size)) == NULL)
return (NULL);
file_size += read_size;
buf_size *= GROWTH_FACTOR;
if ((buf = realloc_buf(buf, buf_size)) == NULL)
return (NULL);
}
free(buf);
return (file);
}
/*
** Reallocate a bigger memory space for file to write what in the buffer
*/
char *ft_memcat(char *file, char *buf, int file_size,
int read_size)
{
int i;
char *file_clone;
if ((file_clone = malloc(sizeof(char) * (file_size + 1))) == NULL)
return (NULL);
i = -1;
while (++i < file_size)
file_clone[i] = file[i];
free(file);
if ((file = malloc(sizeof(char) * (file_size + read_size + 1))) == NULL)
return (NULL);
i = 0;
while (i < file_size)
{
file[i] = file_clone[i];
i++;
}
free(file_clone);
while (i < file_size + read_size)
{
file[i] = buf[i - file_size];
i++;
}
file[i] = '\0';
return (file);
}
/*
** Reallocate a new buffer and free the old one
*/
char *realloc_buf(char *buf, int buf_size)
{
free(buf);
if ((buf = (char*)malloc(sizeof(char) * buf_size)) == NULL)
return (NULL);
return (buf);
}
/*
** Return the n number of a string and return it as an int
*/
int ft_natoi(char *str, unsigned int n)
{
int nb;
unsigned int i;
nb = 0;
i = 0;
while (str[i] && i < n)
{
if (str[i] < '0' || str[i] > '9')
return (-1);
i++;
}
if (i == 0)
return (-1);
i = 0;
while (str[i] && i < n)
{
nb *= 10;
nb += str[i++] - '0';
}
if (nb == 0)
return (-1);
return (nb);
}
/*
** Print one character in the standard output
*/
void ft_putchar(char c)
{
write(STDOUT_FILENO, &c, 1);
}
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