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#include "buffer.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int buffer_grow(struct buffer * b)
{
int allocated = b->allocated + 1024;
if (8192 < allocated)
{
errno = ENOMEM;
return -1;
}
void * buffer = realloc(b->data, allocated);
if (NULL == buffer)
return -1;
b->data = buffer;
b->allocated = allocated;
return allocated;
}
int buffer_prepare_at_least(int fd, struct buffer * in, int minimum_length)
{
const int remaining_bytes = in->length - in->next;
if (remaining_bytes >= minimum_length)
return remaining_bytes;
const int free_space = in->allocated + in->offset - in->length - 1;
while (free_space < minimum_length)
if (-1 == buffer_grow(in))
return -1;
if (0 < in->offset)
{
memmove(in->data, in->data + in->offset, in->length - in->offset);
in->offset = 0;
in->length -= in->offset;
}
int length = read(fd, in->data + in->length, free_space);
if (-1 == length)
return -1;
in->length += length;
return in->length - in->next;
}
int buffer_until(struct buffer * b, const char * pattern, int pattern_length)
{
while (b->next + pattern_length <= b->length)
{
if (0 == strncmp(&b->data[b->next], pattern, pattern_length))
{
return b->next;
}
else
{
b->next++;
}
}
return -1;
}
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