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;
45 if (len + c->pos >= c->space) {
46 len2 = 2*c->space+1 | c->pos+len+1;
47 if (len2 > SSIZE_MAX/4) return 0;
48 newbuf = realloc(c->buf, len2*4);
49 if (!newbuf) return 0;
50 *c->bufp = c->buf = newbuf;
51 memset(c->buf + c->space, 0, 4*(len2 - c->space));
55 len2 = mbsnrtowcs(c->buf+c->pos, (void *)&buf, len, c->space-c->pos, &c->mbs);
56 if (len2 == -1) return 0;
58 if (c->pos >= c->len) c->len = c->pos;
63 static int wms_close(FILE *f)
68 FILE *open_wmemstream(wchar_t **bufp, size_t *sizep)
73 if (!(f=malloc(sizeof *f))) return 0;
74 if (!(buf=malloc(sizeof *buf))) {
78 memset(&f->f, 0, sizeof f->f);
79 memset(&f->c, 0, sizeof f->c);
84 f->c.pos = f->c.len = f->c.space = *sizep = 0;
85 f->c.buf = *bufp = buf;
93 f->f.write = wms_write;
95 f->f.close = wms_close;
97 if (!libc.threaded) f->f.lock = -1;
101 return __ofl_add(&f->f);