1 #include "stdio_impl.h"
13 static off_t wms_seek(FILE *f, off_t off, int whence)
16 struct cookie *c = f->cookie;
22 base = (size_t [3]){0, c->pos, c->len}[whence];
23 if (off < -base || off > SSIZE_MAX/4-base) goto fail;
24 memset(&c->mbs, 0, sizeof c->mbs);
25 return c->pos = base+off;
28 static size_t wms_write(FILE *f, const unsigned char *buf, size_t len)
30 struct cookie *c = f->cookie;
33 if (len + c->pos >= c->space) {
34 len2 = 2*c->space+1 | c->pos+len+1;
35 if (len2 > SSIZE_MAX/4) return 0;
36 newbuf = realloc(c->buf, len2*4);
37 if (!newbuf) return 0;
38 *c->bufp = c->buf = newbuf;
39 memset(c->buf + c->space, 0, 4*(len2 - c->space));
43 len2 = mbsnrtowcs(c->buf+c->pos, (void *)&buf, len, c->space-c->pos, &c->mbs);
44 if (len2 == -1) return 0;
46 if (c->pos >= c->len) c->len = c->pos;
51 static int wms_close(FILE *f)
56 FILE *open_wmemstream(wchar_t **bufp, size_t *sizep)
60 if (!(f=malloc(sizeof *f + sizeof *c))) return 0;
61 memset(f, 0, sizeof *f + sizeof *c);
62 f->cookie = c = (void *)(f+1);
66 c->pos = c->len = c->space = 0;
71 f->buf = (void *)(c+1);
80 f->next = libc.ofl_head;
81 if (libc.ofl_head) libc.ofl_head->prev = f;