1#include "stdio_impl.h"
2#include <wchar.h>
3#include <errno.h>
4#include <limits.h>
5#include <string.h>
6#include <stdlib.h>
7#include <unsupported_api.h>
8#include "libc.h"
9
10struct cookie {
11	wchar_t **bufp;
12	size_t *sizep;
13	size_t pos;
14	wchar_t *buf;
15	size_t len;
16	size_t space;
17	mbstate_t mbs;
18};
19
20struct wms_FILE {
21	FILE f;
22	struct cookie c;
23	unsigned char buf[1];
24};
25
26static off_t wms_seek(FILE *f, off_t off, int whence)
27{
28	ssize_t base;
29	struct cookie *c = f->cookie;
30	if (whence>2U) {
31fail:
32		errno = EINVAL;
33		return -1;
34	}
35	base = (size_t [3]){0, c->pos, c->len}[whence];
36	if (off < -base || off > SSIZE_MAX/4-base) goto fail;
37	memset(&c->mbs, 0, sizeof c->mbs);
38	return c->pos = base+off;
39}
40
41static size_t wms_write(FILE *f, const unsigned char *buf, size_t len)
42{
43	struct cookie *c = f->cookie;
44	size_t len2 = f->wpos - f->wbase;
45	wchar_t *newbuf;
46	if (len2) {
47		f->wpos = f->wbase;
48		if (wms_write(f, f->wbase, len2) < len2) return 0;
49	}
50	if (len + c->pos >= c->space) {
51		len2 = 2*c->space+1 | c->pos+len+1;
52		if (len2 > SSIZE_MAX/4) return 0;
53		newbuf = realloc(c->buf, len2*4);
54		if (!newbuf) return 0;
55		*c->bufp = c->buf = newbuf;
56		memset(c->buf + c->space, 0, 4*(len2 - c->space));
57		c->space = len2;
58	}
59
60	len2 = mbsnrtowcs(c->buf+c->pos, (void *)&buf, len, c->space-c->pos, &c->mbs);
61	if (len2 == -1) return 0;
62	c->pos += len2;
63	if (c->pos >= c->len) c->len = c->pos;
64	*c->sizep = c->pos;
65	return len;
66}
67
68static int wms_close(FILE *f)
69{
70	return 0;
71}
72
73FILE *open_wmemstream(wchar_t **bufp, size_t *sizep)
74{
75	struct wms_FILE *f;
76	wchar_t *buf;
77
78	UNSUPPORTED_API_VOID(LITEOS_A);
79	if (!(f=malloc(sizeof *f))) return 0;
80	if (!(buf=malloc(sizeof *buf))) {
81		free(f);
82		return 0;
83	}
84	memset(&f->f, 0, sizeof f->f);
85	memset(&f->c, 0, sizeof f->c);
86	f->f.cookie = &f->c;
87
88	f->c.bufp = bufp;
89	f->c.sizep = sizep;
90	f->c.pos = f->c.len = f->c.space = *sizep = 0;
91	f->c.buf = *bufp = buf;
92	*buf = 0;
93
94	f->f.flags = F_NORD;
95	f->f.fd = -1;
96	f->f.buf = f->buf;
97	f->f.buf_size = 0;
98	f->f.lbf = EOF;
99	f->f.write = wms_write;
100	f->f.seek = wms_seek;
101	f->f.close = wms_close;
102
103	if (!libc.threaded) f->f.lock = -1;
104
105	fwide(&f->f, 1);
106
107	return __ofl_add(&f->f);
108}
109