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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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.
*
*/
/**
* POSIX.2008 fake implementation for pre-POSIX.2008 systems. (OSX, BSD, MINGW, CYGWIN, older Linux &c.)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#if !(_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L)
typedef struct memstream {
off_t pos;
off_t size;
char * buffer;
char ** bufp;
size_t * sizep;
bool realloc;
} memstream_t;
static int memstream_read (void * cookie, char * buf, int size)
{
memstream_t * mem = (memstream_t *) cookie;
off_t available = mem->size - mem->pos;
if (available < 0)
available = 0;
if (size > available)
size = available;
memcpy(buf, mem->buffer + mem->pos, size);
mem->pos += size;
return size;
}
static int memstream_write (void * cookie, const char * buf, int size)
{
memstream_t * mem = (memstream_t *) cookie;
off_t available = mem->size - mem->pos;
if (size > available) {
if (mem->realloc) {
mem->buffer = (char *) realloc(mem->buffer, mem->pos + size + 1);
memset(mem->buffer + mem->size, 0, mem->pos + size + 1 - mem->size);
mem->size = mem->pos + size;
if (mem->bufp)
*(mem->bufp) = mem->buffer;
if (mem->sizep)
*(mem->sizep) = mem->size;
} else {
size = available;
}
}
memcpy(mem->buffer + mem->pos, buf, sizeof(char) * size);
mem->pos += size;
return size;
}
static fpos_t memstream_seek (void * cookie, fpos_t offset, int whence)
{
memstream_t * mem = (memstream_t *) cookie;
switch (whence) {
case SEEK_SET:
if (offset < 0)
goto error_inval;
mem->pos = offset;
return 0;
case SEEK_CUR:
if (mem->pos + offset < 0)
goto error_inval;
mem->pos += offset;
return 0;
case SEEK_END:
if (mem->size + offset < 0)
goto error_inval;
mem->pos = mem->size + offset;
break;
default:
goto error_inval;
}
return mem->pos;
error_inval:
errno = EINVAL;
return -1;
}
static int memstream_close (void * cookie)
{
memstream_t * mem = (memstream_t *) cookie;
if (mem->bufp)
*(mem->bufp) = mem->buffer;
if (mem->sizep)
*(mem->sizep) = mem->size;
free(cookie);
return 0;
}
FILE * compat_fmemopen (void * buf, size_t size, const char * mode)
{
memstream_t * mem = (memstream_t *) malloc(sizeof(memstream_t));
memset(mem, 0, sizeof(memstream_t));
mem->size = size;
mem->buffer = (char *) buf;
(void) mode;
return funopen(mem, memstream_read, memstream_write, memstream_seek, memstream_close);
}
FILE * compat_open_memstream (char ** bufp, size_t * sizep)
{
memstream_t * mem = (memstream_t *) malloc(sizeof(memstream_t));
memset(mem, 0, sizeof(memstream_t));
mem->bufp = bufp;
mem->sizep = sizep;
mem->realloc = true;
return funopen(mem, memstream_read, memstream_write, memstream_seek, memstream_close);
}
#endif /* !(_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L) */
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