Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 1 | #include "stdio_impl.h" |
Rich Felker | 835f9f9 | 2012-11-08 16:39:41 -0500 | [diff] [blame] | 2 | #include <wchar.h> |
| 3 | #include <errno.h> |
| 4 | #include <limits.h> |
| 5 | #include <string.h> |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 6 | |
| 7 | struct cookie { |
| 8 | wchar_t **bufp; |
| 9 | size_t *sizep; |
| 10 | size_t pos; |
| 11 | wchar_t *buf; |
| 12 | size_t len; |
| 13 | size_t space; |
| 14 | mbstate_t mbs; |
| 15 | }; |
| 16 | |
| 17 | static off_t wms_seek(FILE *f, off_t off, int whence) |
| 18 | { |
| 19 | ssize_t base; |
| 20 | struct cookie *c = f->cookie; |
Rich Felker | c88f36f | 2011-09-04 00:08:32 -0400 | [diff] [blame] | 21 | if (whence>2U) { |
| 22 | fail: |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 23 | errno = EINVAL; |
| 24 | return -1; |
| 25 | } |
Rich Felker | c88f36f | 2011-09-04 00:08:32 -0400 | [diff] [blame] | 26 | base = (size_t [3]){0, c->pos, c->len}[whence]; |
Rich Felker | 32d67e9 | 2011-09-04 00:06:01 -0400 | [diff] [blame] | 27 | if (off < -base || off > SSIZE_MAX/4-base) goto fail; |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 28 | memset(&c->mbs, 0, sizeof c->mbs); |
| 29 | return c->pos = base+off; |
| 30 | } |
| 31 | |
| 32 | static size_t wms_write(FILE *f, const unsigned char *buf, size_t len) |
| 33 | { |
| 34 | struct cookie *c = f->cookie; |
| 35 | size_t len2; |
| 36 | wchar_t *newbuf; |
Rich Felker | 7ee3dcb | 2011-09-04 10:29:04 -0400 | [diff] [blame] | 37 | if (len + c->pos >= c->space) { |
| 38 | len2 = 2*c->space+1 | c->pos+len+1; |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 39 | if (len2 > SSIZE_MAX/4) return 0; |
| 40 | newbuf = realloc(c->buf, len2*4); |
| 41 | if (!newbuf) return 0; |
| 42 | *c->bufp = c->buf = newbuf; |
Rich Felker | 1e69376 | 2011-09-03 20:19:51 -0400 | [diff] [blame] | 43 | memset(c->buf + c->space, 0, 4*(len2 - c->space)); |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 44 | c->space = len2; |
| 45 | } |
| 46 | |
| 47 | len2 = mbsnrtowcs(c->buf+c->pos, (void *)&buf, len, c->space-c->pos, &c->mbs); |
| 48 | if (len2 == -1) return 0; |
| 49 | c->pos += len2; |
| 50 | if (c->pos >= c->len) c->len = c->pos; |
| 51 | *c->sizep = c->pos; |
| 52 | return len; |
| 53 | } |
| 54 | |
| 55 | static int wms_close(FILE *f) |
| 56 | { |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | FILE *open_wmemstream(wchar_t **bufp, size_t *sizep) |
| 61 | { |
| 62 | FILE *f; |
| 63 | struct cookie *c; |
Rich Felker | 7b9f57f | 2015-10-08 22:03:53 +0000 | [diff] [blame] | 64 | wchar_t *buf; |
| 65 | |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 66 | if (!(f=malloc(sizeof *f + sizeof *c))) return 0; |
Rich Felker | 7b9f57f | 2015-10-08 22:03:53 +0000 | [diff] [blame] | 67 | if (!(buf=malloc(sizeof *buf))) { |
| 68 | free(f); |
| 69 | return 0; |
| 70 | } |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 71 | memset(f, 0, sizeof *f + sizeof *c); |
| 72 | f->cookie = c = (void *)(f+1); |
| 73 | |
| 74 | c->bufp = bufp; |
| 75 | c->sizep = sizep; |
Rich Felker | 7b9f57f | 2015-10-08 22:03:53 +0000 | [diff] [blame] | 76 | c->pos = c->len = c->space = *sizep = 0; |
| 77 | c->buf = *bufp = buf; |
| 78 | *buf = 0; |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 79 | |
| 80 | f->flags = F_NORD; |
| 81 | f->fd = -1; |
| 82 | f->buf = (void *)(c+1); |
| 83 | f->buf_size = 0; |
| 84 | f->lbf = EOF; |
| 85 | f->write = wms_write; |
| 86 | f->seek = wms_seek; |
| 87 | f->close = wms_close; |
| 88 | |
Rich Felker | dc059f0 | 2012-11-09 14:26:25 -0500 | [diff] [blame] | 89 | if (!libc.threaded) f->lock = -1; |
| 90 | |
Rich Felker | 1b0cdc8 | 2015-06-16 07:11:19 +0000 | [diff] [blame] | 91 | return __ofl_add(f); |
Rich Felker | 1461e02 | 2011-09-03 19:49:46 -0400 | [diff] [blame] | 92 | } |