1 #include "stdio_impl.h"
25 static off_t wms_seek(FILE *f, off_t off, int whence)
28 struct cookie *c = f->cookie;
34 base = (size_t [3]){0, c->pos, c->len}[whence];
35 if (off < -base || off > SSIZE_MAX/4-base) goto fail;
36 memset(&c->mbs, 0, sizeof c->mbs);
37 return c->pos = base+off;
40 static size_t wms_write(FILE *f, const unsigned char *buf, size_t len)
42 struct cookie *c = f->cookie;
43 size_t len2 = f->wpos - f->wbase;
47 if (wms_write(f, f->wbase, len2) < len2) return 0;
49 if (len + c->pos >= c->space) {
50 len2 = 2*c->space+1 | c->pos+len+1;
51 if (len2 > SSIZE_MAX/4) return 0;
52 newbuf = realloc(c->buf, len2*4);
53 if (!newbuf) return 0;
54 *c->bufp = c->buf = newbuf;
55 memset(c->buf + c->space, 0, 4*(len2 - c->space));
59 len2 = mbsnrtowcs(c->buf+c->pos, (void *)&buf, len, c->space-c->pos, &c->mbs);
60 if (len2 == -1) return 0;
62 if (c->pos >= c->len) c->len = c->pos;
67 static int wms_close(FILE *f)
72 FILE *open_wmemstream(wchar_t **bufp, size_t *sizep)
77 if (!(f=malloc(sizeof *f))) return 0;
78 if (!(buf=malloc(sizeof *buf))) {
82 memset(&f->f, 0, sizeof f->f);
83 memset(&f->c, 0, sizeof f->c);
88 f->c.pos = f->c.len = f->c.space = *sizep = 0;
89 f->c.buf = *bufp = buf;
97 f->f.write = wms_write;
99 f->f.close = wms_close;
101 if (!libc.threaded) f->f.lock = -1;
105 return __ofl_add(&f->f);