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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* FreeBSD does not have an fmemopen(), so we roll our own minimalist
* implementation here.
*/
#include "types.h"
#include <stdio.h>
#include <stdlib.h>
#include "assert.h"
#include "fmemopen.h"
#if !defined(HAVE_FMEMOPEN)
struct fmemopen_read_state {
char *next; /* the next byte to return */
char *end; /* the byte after the end of the string */
};
static int fmemopen_readfn(void *cookie, char *buf, int len)
{
struct fmemopen_read_state *read_cookie =
(struct fmemopen_read_state *)cookie;
int bytes = 0;
assert(read_cookie->next <= read_cookie->end);
if (read_cookie->next == read_cookie->end)
return 0;
bytes = read_cookie->end - read_cookie->next;
if (len < bytes)
bytes = len;
memcpy(buf, read_cookie->next, bytes);
read_cookie->next += bytes;
return bytes;
}
FILE *fmemopen(char *str, size_t size, const char *mode)
{
FILE *f = NULL;
struct fmemopen_read_state *read_cookie;
assert(strcmp(mode, "r") == 0); /* only support read for now */
read_cookie = calloc(1, sizeof(struct fmemopen_read_state));
read_cookie->next = str;
read_cookie->end = str + size;
f = fropen(read_cookie, fmemopen_readfn);
if (!f) {
free(read_cookie);
return NULL;
}
return f;
}
#endif /* HAVE_FMEMOPEN */
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