Hash :
cbd7ffcb
Author :
Thomas de Grivel
Date :
2021-12-29T18:12:45
WIP
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/*
* kv - key value text file format
*
* Copyright 2022 Thomas de Grivel
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "buffer.h"
int buffer_init (s_buffer *b, FILE *fp, void *state)
{
assert(b);
b->chars = calloc(BUFFER_SIZE, 1);
if (!b->chars)
return -1;
b->fp = fp;
b->pos = 0;
b->size = BUFFER_SIZE;
b->state = state;
b->wpos = 0;
b->k = NULL;
return 0;
}
s_buffer * buffer_new (FILE *fp, void *state)
{
s_buffer *b = calloc(1, sizeof(s_buffer));
if (!b)
return NULL;
if (buffer_init(b, fp, state))
return NULL;
return b;
}
int buffer_resize (s_buffer *b, size_t new_size)
{
void *ptr;
assert(b);
assert(new_size >= b->size);
if (new_size == b->size)
return 0;
ptr = realloc(b->chars, new_size);
if (!ptr)
return -1;
b->chars = ptr;
b->size = new_size;
return 0;
}
int buffer_fill (s_buffer *b)
{
size_t r;
assert(b);
if (b->wpos == b->size &&
buffer_resize(b, b->size + BUFFER_SIZE))
return -1;
assert(b->wpos < b->size);
r = fread(b->chars + b->wpos, 1, b->size - b->wpos, b->fp);
if (r <= 0)
return -1;
b->wpos += r;
return 0;
}
int buffer_peek (s_buffer *b)
{
assert(b);
if (b->pos == b->wpos &&
buffer_fill(b))
return -1;
assert(b->pos < b->wpos);
return b->chars[b->pos];
}
int buffer_peek_n (s_buffer *b, size_t n)
{
assert(b);
if (n == 0)
return 0;
while (b->pos + n >= b->wpos)
if (buffer_fill(b))
return -1;
assert(b->pos + n < b->wpos);
return 0;
}
int buffer_read (s_buffer *b)
{
int c = buffer_peek(b);
if (c >= 0)
b->pos++;
return c;
}
int buffer_read_n (s_buffer *b, size_t n)
{
if (buffer_peek_n(b, n))
return -1;
b->pos += n;
return 0;
}
int buffer_flush (s_buffer *b)
{
assert(b);
if (b->pos == 0)
return 0;
memmove(b->chars, b->chars + b->pos, b->wpos - b->pos);
b->pos = 0;
b->wpos -= b->pos;
return 0;
}
int buffer_close (s_buffer *b)
{
if (!b)
return 0;
fclose(b->fp);
free(b->chars);
b->chars = NULL;
b->pos = 0;
b->size = 0;
b->state = NULL;
b->wpos = 0;
return 0;
}
int buffer_delete (s_buffer *b)
{
if (buffer_close(b))
return -1;
free(b);
return 0;
}