/*
* Copyright (c) 2017 Joachim Nilsson <troglobit@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_FUNOPEN
#include <stdlib.h>
#include <memory.h>
struct ops {
char *buf;
size_t len, pos;
};
typedef struct ops ops_t;
static int readfn(void *arg, char *buf, int len)
{
int sz;
ops_t *ops = (ops_t *)arg;
sz = (int)(ops->len - ops->pos);
if (sz < 0)
sz = 0;
if (len > sz)
len = sz;
memcpy(buf, &ops->buf[ops->pos], len);
ops->pos += len;
return len;
}
static int writefn(void *arg, const char *buf, int len)
{
int sz;
ops_t *ops = (ops_t *)arg;
sz = (int)(ops->len - ops->pos);
if (sz < 0)
sz = 0;
if (len > sz)
len = sz;
memcpy(&ops->buf[ops->pos], buf, len);
ops->pos += len;
return len;
}
static fpos_t seekfn(void *arg, fpos_t offset, int whence)
{
fpos_t pos;
ops_t *ops = (ops_t *)arg;
switch (whence) {
case SEEK_SET:
pos = offset;
break;
case SEEK_END:
pos = ops->len + offset;
break;
case SEEK_CUR:
pos = ops->pos + offset;
break;
default:
return -1;
}
if (pos < 0 || (size_t)pos > ops->len) {
ops->pos = 0;
return -1;
}
return 0;
}
static int closefn(void *arg)
{
free(arg);
return 0;
}
FILE *fmemopen(void *buf, size_t len, const char *type)
{
ops_t *ops = malloc(sizeof(*ops));
if (!ops)
return NULL;
memset(ops, 0, sizeof(*ops));
ops->buf = buf;
ops->len = len;
ops->pos = 0;
return funopen(ops, readfn, writefn, seekfn, closefn);
}
#elif defined(HAVE_WINDOWS_H)
#include <io.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <windows.h>
FILE *fmemopen(void *buf, size_t len, const char *type)
{
int fd;
FILE *fp;
char tp[MAX_PATH - 13];
char fn[MAX_PATH + 1];
if (!GetTempPathA(sizeof(tp), tp))
return NULL;
if (!GetTempFileNameA(tp, "confuse", 0, fn))
return NULL;
fd = _open(fn,
_O_CREAT | _O_RDWR | _O_SHORT_LIVED | _O_TEMPORARY | _O_BINARY,
_S_IREAD | _S_IWRITE);
if (fd == -1)
return NULL;
fp = _fdopen(fd, "w+");
if (!fp) {
_close(fd);
return NULL;
}
fwrite(buf, len, 1, fp);
rewind(fp);
return fp;
}
#else
#error Sorry, this platform currently has no fmemopen() replacement.
#endif
/**
* Local Variables:
* indent-tabs-mode: t
* c-file-style: "linux"
* End:
*/
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