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cbuffer.c
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cbuffer.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* cbuffer.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dlancar <dlancar@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2015/10/16 11:20:47 by dlancar #+# #+# */
/* Updated: 2016/12/08 15:15:37 by dlancar ### ########.fr */
/* */
/* ************************************************************************** */
#include "cbuffer.h"
#include <stdlib.h>
t_cbuffer *cbuffer_new(unsigned int capacity)
{
t_cbuffer *res;
res = ft_malloc(sizeof(t_cbuffer));
if (!res)
return (NULL);
res->arr = ft_malloc(capacity + 1);
if (!res->arr)
return (NULL);
ft_bzero(res->arr, capacity + 1);
res->capacity = capacity;
res->start = 0;
res->end = 0;
res->it = res->start;
res->write = false;
return (res);
}
t_cbuffer *cbuffer_add(t_cbuffer *buffer, const char *data,
unsigned int data_size)
{
unsigned int overflow;
buffer->write = true;
if (buffer->end + data_size <= buffer->capacity)
{
ft_memcpy(buffer->arr + buffer->end, data, data_size);
buffer->end += data_size;
return (buffer);
}
ft_memcpy(buffer->arr + buffer->end, data, buffer->capacity - buffer->end);
overflow = data_size - (buffer->capacity - buffer->end);
ft_memcpy(buffer->arr,
data + buffer->capacity - buffer->end,
overflow);
buffer->start = (buffer->start + overflow) % buffer->capacity;
buffer->it = buffer->start;
buffer->end = overflow;
return (buffer);
}
bool cbuffer_has_next(const t_cbuffer *buffer)
{
return ((buffer->it + 1) % buffer->capacity != buffer->end
|| buffer->write);
}
char cbuffer_get_next(const t_cbuffer *buffer)
{
return (buffer->arr[(buffer->it + 1) % buffer->capacity]);
}
char cbuffer_next(t_cbuffer *buffer)
{
char res;
res = buffer->arr[buffer->it];
buffer->write = false;
buffer->it = (buffer->it + 1) % buffer->capacity;
return (res);
}