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#include "stdio_impl.h"
struct cookie {
wchar_t **bufp;
size_t *sizep;
size_t pos;
wchar_t *buf;
size_t len;
size_t space;
mbstate_t mbs;
};
static off_t wms_seek(FILE *f, off_t off, int whence)
{
ssize_t base;
struct cookie *c = f->cookie;
switch (whence) {
case SEEK_SET:
base = 0;
break;
case SEEK_CUR:
base = c->pos;
break;
case SEEK_END:
base = c->len;
break;
default:
fail:
errno = EINVAL;
return -1;
}
if (-off > base || off > SSIZE_MAX/4-base) goto fail;
memset(&c->mbs, 0, sizeof c->mbs);
return c->pos = base+off;
}
static size_t wms_write(FILE *f, const unsigned char *buf, size_t len)
{
struct cookie *c = f->cookie;
size_t len2;
wchar_t *newbuf;
if (len > c->space - c->pos) {
len2 = 2*c->space+1 | c->space+len+1;
if (len2 > SSIZE_MAX/4) return 0;
newbuf = realloc(c->buf, len2*4);
if (!newbuf) return 0;
*c->bufp = c->buf = newbuf;
memset(c->buf + c->space, 0, len2 - c->space);
c->space = len2;
}
len2 = mbsnrtowcs(c->buf+c->pos, (void *)&buf, len, c->space-c->pos, &c->mbs);
if (len2 == -1) return 0;
c->pos += len2;
if (c->pos >= c->len) c->len = c->pos;
*c->sizep = c->pos;
return len;
}
static int wms_close(FILE *f)
{
return 0;
}
FILE *open_wmemstream(wchar_t **bufp, size_t *sizep)
{
FILE *f;
struct cookie *c;
if (!(f=malloc(sizeof *f + sizeof *c))) return 0;
memset(f, 0, sizeof *f + sizeof *c);
f->cookie = c = (void *)(f+1);
c->bufp = bufp;
c->sizep = sizep;
c->pos = c->len = c->space = 0;
c->buf = 0;
f->flags = F_NORD;
f->fd = -1;
f->buf = (void *)(c+1);
f->buf_size = 0;
f->lbf = EOF;
f->write = wms_write;
f->seek = wms_seek;
f->close = wms_close;
if (!libc.threaded) {
f->lock = -1;
f->next = libc.ofl_head;
if (libc.ofl_head) libc.ofl_head->prev = f;
libc.ofl_head = f;
}
return f;
}
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