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/*
* The MIT License (MIT)
*
* Copyright © 2015-2016 Franklin "Snaipe" Mathieu <http://snai.pe/>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include "config.h"
#include "internal.h"
#include "criterion/redirect.h"
#if defined (HAVE_FUNOPEN) || defined (HAVE_FOPENCOOKIE)
# ifdef HAVE_FUNOPEN
typedef int cr_count;
typedef int cr_retcount;
typedef fpos_t cr_off;
# else
typedef size_t cr_count;
typedef ssize_t cr_retcount;
typedef off64_t cr_off;
# endif
struct memfile {
size_t size;
size_t region_size;
size_t cur;
size_t max_size;
char *mem;
};
static inline size_t size_safe_add(size_t size, size_t cur, cr_off off)
{
cur = cur < SIZE_MAX - off ? cur + off : SIZE_MAX;
return cur < size ? cur : size;
}
static inline size_t off_safe_add(size_t size, size_t cur, cr_off off)
{
if (off >= 0)
cur = cur < SIZE_MAX - off ? cur + off : SIZE_MAX;
else
cur = cur > (size_t) -off ? cur + off : 0;
return cur < size ? cur : size;
}
# define errno_return(Errno, Val) \
do { \
errno = (Errno); \
return (Val); \
} while (0)
static cr_retcount mock_file_read(void *cookie, char *buf, cr_count count)
{
struct memfile *mf = cookie;
# ifdef HAVE_FUNOPEN
if (count < 0)
errno_return(EINVAL, (cr_retcount) - 1);
# endif
if (mf->cur >= mf->size || count == 0)
return 0;
size_t end = size_safe_add(mf->size, mf->cur, count);
count = end - mf->cur;
memcpy(buf, mf->mem + mf->cur, count);
mf->cur = end;
return count;
}
static cr_retcount mock_file_write(void *cookie, const char *buf, cr_count count)
{
struct memfile *mf = cookie;
# ifdef HAVE_FUNOPEN
if (count < 0)
errno_return(EINVAL, (cr_retcount) - 1);
# endif
if (count == 0)
return 0;
if (mf->cur >= mf->max_size)
errno_return(EIO, (cr_retcount) - 1);
size_t end = size_safe_add(mf->max_size, mf->cur, count);
if (mf->size < end)
mf->size = end;
count = end - mf->cur;
if (mf->size > mf->region_size) {
while (mf->size > mf->region_size)
mf->region_size = mf->region_size * 3 / 2;
char *newptr = realloc(mf->mem, mf->region_size);
if (!newptr)
errno_return(EIO, (cr_retcount) - 1);
mf->mem = newptr;
}
memcpy(mf->mem + mf->cur, buf, count);
mf->cur = end;
return count;
}
# ifdef HAVE_FUNOPEN
static cr_off mock_file_seek(void *cookie, cr_off off, int whence)
{
struct memfile *mf = cookie;
switch (whence) {
case SEEK_SET: return mf->cur = off;
case SEEK_CUR: return mf->cur = off_safe_add(mf->size, mf->cur, off);
case SEEK_END: return mf->cur = off_safe_add(mf->size, mf->size, off);
default: break;
}
errno = EINVAL;
return (off_t) -1;
}
# else
static int mock_file_seek(void *cookie, cr_off *off, int whence)
{
struct memfile *mf = cookie;
switch (whence) {
case SEEK_SET: mf->cur = *off; break;
case SEEK_CUR: *off = (mf->cur = off_safe_add(mf->size, mf->cur, *off)); break;
case SEEK_END: *off = (mf->cur = off_safe_add(mf->size, mf->size, *off)); break;
default: errno = EINVAL; return -1;
}
return 0;
}
# endif
static int mock_file_close(void *cookie)
{
struct memfile *mf = cookie;
free(mf->mem);
free(cookie);
return 0;
}
#endif /* defined(HAVE_FUNOPEN) || defined(HAVE_FOPENCOOKIE) */
FILE *cr_mock_file_size(size_t max_size)
{
#if defined (HAVE_FUNOPEN) || defined (HAVE_FOPENCOOKIE)
struct memfile *cookie = malloc(sizeof (struct memfile));
*cookie = (struct memfile) {
.max_size = max_size,
.region_size = 4096,
.mem = malloc(4096),
};
FILE *f;
# if defined (HAVE_FOPENCOOKIE)
f = fopencookie(cookie, "w+", (cookie_io_functions_t) {
.read = mock_file_read,
.write = mock_file_write,
.seek = mock_file_seek,
.close = mock_file_close,
});
# else
f = funopen(cookie,
mock_file_read,
mock_file_write,
mock_file_seek,
mock_file_close);
# endif
return f;
#elif defined (HAVE_OPEN_MEMSTREAM)
(void) max_size;
char *mem;
size_t sz;
/* We're actually leaking memory here. Can't do much, really -- we don't
* really know when the user decides to close the file, and iterating a
* list of opened memory streams to free them at exit wouldn't be worth
* the effort. */
return open_memstream(&mem, &sz);
#else
(void) max_size;
/* fallback to tmpfile() */
return tmpfile();
#endif
}
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