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688903eb | 1 | /* Copyright (C) 1993-2018 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
d64b6ad0 | 3 | |
41bdb6e2 AJ |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
d64b6ad0 | 8 | |
41bdb6e2 AJ |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
d64b6ad0 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 AJ |
12 | Lesser General Public License for more details. |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
41bdb6e2 AJ |
17 | |
18 | As a special exception, if you link the code in this file with | |
19 | files compiled with a GNU compiler to produce an executable, | |
20 | that does not cause the resulting executable to be covered by | |
21 | the GNU Lesser General Public License. This exception does not | |
22 | however invalidate any other reasons why the executable file | |
23 | might be covered by the GNU Lesser General Public License. | |
24 | This exception applies to code released by its copyright holders | |
25 | in files containing the exception. */ | |
d64b6ad0 | 26 | |
107b8a92 | 27 | #include <assert.h> |
d64b6ad0 UD |
28 | #include "strfile.h" |
29 | #include "libioP.h" | |
30 | #include <string.h> | |
31 | #include <wchar.h> | |
0d875352 | 32 | #include <stdio_ext.h> |
d64b6ad0 | 33 | |
d64b6ad0 | 34 | void |
9964a145 | 35 | _IO_wstr_init_static (FILE *fp, wchar_t *ptr, size_t size, |
9dd346ff | 36 | wchar_t *pstart) |
d64b6ad0 | 37 | { |
40a54e4d | 38 | wchar_t *end; |
b2637a22 | 39 | |
d64b6ad0 | 40 | if (size == 0) |
40a54e4d | 41 | end = ptr + __wcslen (ptr); |
9964a145 | 42 | else if ((size_t) ptr + size * sizeof (wchar_t) > (size_t) ptr) |
40a54e4d UD |
43 | end = ptr + size; |
44 | else | |
45 | /* Even for misaligned ptr make sure there is integral number of wide | |
46 | characters. */ | |
9964a145 | 47 | end = ptr + (-1 - (size_t) ptr) / sizeof (wchar_t); |
d18ea0c5 | 48 | _IO_wsetb (fp, ptr, end, 0); |
d64b6ad0 UD |
49 | |
50 | fp->_wide_data->_IO_write_base = ptr; | |
51 | fp->_wide_data->_IO_read_base = ptr; | |
52 | fp->_wide_data->_IO_read_ptr = ptr; | |
53 | if (pstart) | |
54 | { | |
55 | fp->_wide_data->_IO_write_ptr = pstart; | |
40a54e4d | 56 | fp->_wide_data->_IO_write_end = end; |
d64b6ad0 UD |
57 | fp->_wide_data->_IO_read_end = pstart; |
58 | } | |
59 | else | |
60 | { | |
61 | fp->_wide_data->_IO_write_ptr = ptr; | |
62 | fp->_wide_data->_IO_write_end = ptr; | |
40a54e4d | 63 | fp->_wide_data->_IO_read_end = end; |
d64b6ad0 UD |
64 | } |
65 | /* A null _allocate_buffer function flags the strfile as being static. */ | |
107b8a92 | 66 | (((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0; |
d64b6ad0 UD |
67 | } |
68 | ||
9964a145 ZW |
69 | wint_t |
70 | _IO_wstr_overflow (FILE *fp, wint_t c) | |
d64b6ad0 UD |
71 | { |
72 | int flush_only = c == WEOF; | |
9964a145 | 73 | size_t pos; |
d64b6ad0 UD |
74 | if (fp->_flags & _IO_NO_WRITES) |
75 | return flush_only ? 0 : WEOF; | |
76 | if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING)) | |
77 | { | |
78 | fp->_flags |= _IO_CURRENTLY_PUTTING; | |
79 | fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr; | |
80 | fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end; | |
81 | } | |
107b8a92 | 82 | pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base; |
9964a145 | 83 | if (pos >= (size_t) (_IO_wblen (fp) + flush_only)) |
d64b6ad0 | 84 | { |
1e88bd0f | 85 | if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* not allowed to enlarge */ |
d64b6ad0 UD |
86 | return WEOF; |
87 | else | |
88 | { | |
89 | wchar_t *new_buf; | |
90 | wchar_t *old_buf = fp->_wide_data->_IO_buf_base; | |
107b8a92 | 91 | size_t old_wblen = _IO_wblen (fp); |
9964a145 | 92 | size_t new_size = 2 * old_wblen + 100; |
bdf1ff05 PP |
93 | |
94 | if (__glibc_unlikely (new_size < old_wblen) | |
95 | || __glibc_unlikely (new_size > SIZE_MAX / sizeof (wchar_t))) | |
107b8a92 | 96 | return EOF; |
bdf1ff05 | 97 | |
d64b6ad0 UD |
98 | new_buf |
99 | = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size | |
100 | * sizeof (wchar_t)); | |
101 | if (new_buf == NULL) | |
102 | { | |
103 | /* __ferror(fp) = 1; */ | |
104 | return WEOF; | |
105 | } | |
106 | if (old_buf) | |
107 | { | |
107b8a92 | 108 | __wmemcpy (new_buf, old_buf, old_wblen); |
d64b6ad0 UD |
109 | (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf); |
110 | /* Make sure _IO_setb won't try to delete _IO_buf_base. */ | |
111 | fp->_wide_data->_IO_buf_base = NULL; | |
112 | } | |
107b8a92 | 113 | |
cfac4de6 | 114 | __wmemset (new_buf + old_wblen, L'\0', new_size - old_wblen); |
107b8a92 | 115 | |
d18ea0c5 | 116 | _IO_wsetb (fp, new_buf, new_buf + new_size, 1); |
d64b6ad0 UD |
117 | fp->_wide_data->_IO_read_base = |
118 | new_buf + (fp->_wide_data->_IO_read_base - old_buf); | |
119 | fp->_wide_data->_IO_read_ptr = | |
120 | new_buf + (fp->_wide_data->_IO_read_ptr - old_buf); | |
121 | fp->_wide_data->_IO_read_end = | |
122 | new_buf + (fp->_wide_data->_IO_read_end - old_buf); | |
123 | fp->_wide_data->_IO_write_ptr = | |
124 | new_buf + (fp->_wide_data->_IO_write_ptr - old_buf); | |
125 | ||
126 | fp->_wide_data->_IO_write_base = new_buf; | |
127 | fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end; | |
128 | } | |
129 | } | |
130 | ||
131 | if (!flush_only) | |
132 | *fp->_wide_data->_IO_write_ptr++ = c; | |
133 | if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end) | |
134 | fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; | |
135 | return c; | |
136 | } | |
137 | ||
107b8a92 | 138 | |
9964a145 ZW |
139 | wint_t |
140 | _IO_wstr_underflow (FILE *fp) | |
d64b6ad0 UD |
141 | { |
142 | if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end) | |
143 | fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; | |
144 | if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING)) | |
145 | { | |
146 | fp->_flags &= ~_IO_CURRENTLY_PUTTING; | |
147 | fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr; | |
148 | fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end; | |
149 | } | |
150 | if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end) | |
151 | return *fp->_wide_data->_IO_read_ptr; | |
152 | else | |
0923a2c8 | 153 | return WEOF; |
d64b6ad0 UD |
154 | } |
155 | ||
a334319f | 156 | |
107b8a92 | 157 | /* The size of the valid part of the buffer. */ |
9964a145 ZW |
158 | ssize_t |
159 | _IO_wstr_count (FILE *fp) | |
d64b6ad0 | 160 | { |
107b8a92 UD |
161 | struct _IO_wide_data *wd = fp->_wide_data; |
162 | ||
163 | return ((wd->_IO_write_ptr > wd->_IO_read_end | |
164 | ? wd->_IO_write_ptr : wd->_IO_read_end) | |
165 | - wd->_IO_read_base); | |
d64b6ad0 UD |
166 | } |
167 | ||
107b8a92 UD |
168 | |
169 | static int | |
9964a145 | 170 | enlarge_userbuf (FILE *fp, off64_t offset, int reading) |
107b8a92 | 171 | { |
9964a145 | 172 | if ((ssize_t) offset <= _IO_wblen (fp)) |
107b8a92 UD |
173 | return 0; |
174 | ||
175 | struct _IO_wide_data *wd = fp->_wide_data; | |
176 | ||
9964a145 | 177 | ssize_t oldend = wd->_IO_write_end - wd->_IO_write_base; |
107b8a92 UD |
178 | |
179 | /* Try to enlarge the buffer. */ | |
1e88bd0f | 180 | if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) |
107b8a92 UD |
181 | /* User-provided buffer. */ |
182 | return 1; | |
183 | ||
9964a145 | 184 | size_t newsize = offset + 100; |
bdf1ff05 PP |
185 | if (__glibc_unlikely (newsize > SIZE_MAX / sizeof (wchar_t))) |
186 | return 1; | |
187 | ||
107b8a92 UD |
188 | wchar_t *oldbuf = wd->_IO_buf_base; |
189 | wchar_t *newbuf | |
190 | = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize | |
191 | * sizeof (wchar_t)); | |
192 | if (newbuf == NULL) | |
193 | return 1; | |
194 | ||
195 | if (oldbuf != NULL) | |
196 | { | |
197 | __wmemcpy (newbuf, oldbuf, _IO_wblen (fp)); | |
198 | (*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf); | |
199 | /* Make sure _IO_setb won't try to delete | |
200 | _IO_buf_base. */ | |
201 | wd->_IO_buf_base = NULL; | |
202 | } | |
203 | ||
d18ea0c5 | 204 | _IO_wsetb (fp, newbuf, newbuf + newsize, 1); |
107b8a92 UD |
205 | |
206 | if (reading) | |
207 | { | |
208 | wd->_IO_write_base = newbuf + (wd->_IO_write_base - oldbuf); | |
209 | wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf); | |
210 | wd->_IO_write_end = newbuf + (wd->_IO_write_end - oldbuf); | |
211 | wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf); | |
212 | ||
213 | wd->_IO_read_base = newbuf; | |
214 | wd->_IO_read_end = wd->_IO_buf_end; | |
215 | } | |
216 | else | |
217 | { | |
218 | wd->_IO_read_base = newbuf + (wd->_IO_read_base - oldbuf); | |
219 | wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf); | |
220 | wd->_IO_read_end = newbuf + (wd->_IO_read_end - oldbuf); | |
221 | wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf); | |
222 | ||
223 | wd->_IO_write_base = newbuf; | |
224 | wd->_IO_write_end = wd->_IO_buf_end; | |
225 | } | |
226 | ||
227 | /* Clear the area between the last write position and th | |
228 | new position. */ | |
229 | assert (offset >= oldend); | |
230 | if (reading) | |
cfac4de6 | 231 | __wmemset (wd->_IO_read_base + oldend, L'\0', offset - oldend); |
107b8a92 | 232 | else |
cfac4de6 | 233 | __wmemset (wd->_IO_write_base + oldend, L'\0', offset - oldend); |
107b8a92 UD |
234 | |
235 | return 0; | |
236 | } | |
237 | ||
645f97ce | 238 | static void |
9964a145 | 239 | _IO_wstr_switch_to_get_mode (FILE *fp) |
645f97ce AZ |
240 | { |
241 | if (_IO_in_backup (fp)) | |
242 | fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_backup_base; | |
243 | else | |
244 | { | |
245 | fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_buf_base; | |
246 | if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end) | |
247 | fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; | |
248 | } | |
249 | fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr; | |
250 | fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; | |
251 | ||
252 | fp->_flags &= ~_IO_CURRENTLY_PUTTING; | |
253 | } | |
107b8a92 | 254 | |
9964a145 ZW |
255 | off64_t |
256 | _IO_wstr_seekoff (FILE *fp, off64_t offset, int dir, int mode) | |
d64b6ad0 | 257 | { |
9964a145 | 258 | off64_t new_pos; |
d64b6ad0 UD |
259 | |
260 | if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET)) | |
261 | mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT); | |
262 | ||
645f97ce AZ |
263 | bool was_writing = (fp->_wide_data->_IO_write_ptr > |
264 | fp->_wide_data->_IO_write_base | |
265 | || _IO_in_put_mode (fp)); | |
266 | if (was_writing) | |
267 | _IO_wstr_switch_to_get_mode (fp); | |
268 | ||
d64b6ad0 UD |
269 | if (mode == 0) |
270 | { | |
645f97ce AZ |
271 | new_pos = (fp->_wide_data->_IO_write_ptr |
272 | - fp->_wide_data->_IO_write_base); | |
d64b6ad0 UD |
273 | } |
274 | else | |
275 | { | |
9964a145 | 276 | ssize_t cur_size = _IO_wstr_count (fp); |
d64b6ad0 UD |
277 | new_pos = EOF; |
278 | ||
279 | /* Move the get pointer, if requested. */ | |
280 | if (mode & _IOS_INPUT) | |
281 | { | |
9964a145 | 282 | ssize_t base; |
d64b6ad0 UD |
283 | switch (dir) |
284 | { | |
645f97ce AZ |
285 | case _IO_seek_set: |
286 | base = 0; | |
d64b6ad0 UD |
287 | break; |
288 | case _IO_seek_cur: | |
645f97ce AZ |
289 | base = (fp->_wide_data->_IO_read_ptr |
290 | - fp->_wide_data->_IO_read_base); | |
d64b6ad0 | 291 | break; |
645f97ce AZ |
292 | default: /* case _IO_seek_end: */ |
293 | base = cur_size; | |
d64b6ad0 UD |
294 | break; |
295 | } | |
9964a145 | 296 | ssize_t maxval = SSIZE_MAX/sizeof (wchar_t) - base; |
645f97ce AZ |
297 | if (offset < -base || offset > maxval) |
298 | { | |
299 | __set_errno (EINVAL); | |
300 | return EOF; | |
301 | } | |
302 | base += offset; | |
303 | if (base > cur_size | |
304 | && enlarge_userbuf (fp, base, 1) != 0) | |
d64b6ad0 UD |
305 | return EOF; |
306 | fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base | |
645f97ce | 307 | + base); |
d64b6ad0 UD |
308 | fp->_wide_data->_IO_read_end = (fp->_wide_data->_IO_read_base |
309 | + cur_size); | |
310 | new_pos = offset; | |
311 | } | |
312 | ||
313 | /* Move the put pointer, if requested. */ | |
314 | if (mode & _IOS_OUTPUT) | |
315 | { | |
9964a145 | 316 | ssize_t base; |
d64b6ad0 UD |
317 | switch (dir) |
318 | { | |
645f97ce AZ |
319 | case _IO_seek_set: |
320 | base = 0; | |
d64b6ad0 UD |
321 | break; |
322 | case _IO_seek_cur: | |
645f97ce AZ |
323 | base = (fp->_wide_data->_IO_write_ptr |
324 | - fp->_wide_data->_IO_write_base); | |
d64b6ad0 | 325 | break; |
645f97ce AZ |
326 | default: /* case _IO_seek_end: */ |
327 | base = cur_size; | |
d64b6ad0 UD |
328 | break; |
329 | } | |
9964a145 | 330 | ssize_t maxval = SSIZE_MAX/sizeof (wchar_t) - base; |
645f97ce AZ |
331 | if (offset < -base || offset > maxval) |
332 | { | |
333 | __set_errno (EINVAL); | |
334 | return EOF; | |
335 | } | |
336 | base += offset; | |
337 | if (base > cur_size | |
338 | && enlarge_userbuf (fp, base, 0) != 0) | |
d64b6ad0 UD |
339 | return EOF; |
340 | fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base | |
645f97ce AZ |
341 | + base); |
342 | new_pos = base; | |
d64b6ad0 UD |
343 | } |
344 | } | |
345 | return new_pos; | |
346 | } | |
347 | ||
9964a145 ZW |
348 | wint_t |
349 | _IO_wstr_pbackfail (FILE *fp, wint_t c) | |
d64b6ad0 | 350 | { |
6dd67bd5 | 351 | if ((fp->_flags & _IO_NO_WRITES) && c != WEOF) |
d64b6ad0 | 352 | return WEOF; |
d18ea0c5 | 353 | return _IO_wdefault_pbackfail (fp, c); |
d64b6ad0 UD |
354 | } |
355 | ||
356 | void | |
9964a145 | 357 | _IO_wstr_finish (FILE *fp, int dummy) |
d64b6ad0 | 358 | { |
1e88bd0f | 359 | if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF)) |
d64b6ad0 UD |
360 | (((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base); |
361 | fp->_wide_data->_IO_buf_base = NULL; | |
362 | ||
d18ea0c5 | 363 | _IO_wdefault_finish (fp, 0); |
d64b6ad0 UD |
364 | } |
365 | ||
db3476af | 366 | const struct _IO_jump_t _IO_wstr_jumps libio_vtable = |
d64b6ad0 UD |
367 | { |
368 | JUMP_INIT_DUMMY, | |
369 | JUMP_INIT(finish, _IO_wstr_finish), | |
370 | JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstr_overflow), | |
371 | JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow), | |
d18ea0c5 | 372 | JUMP_INIT(uflow, (_IO_underflow_t) _IO_wdefault_uflow), |
d64b6ad0 | 373 | JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail), |
d18ea0c5 AS |
374 | JUMP_INIT(xsputn, _IO_wdefault_xsputn), |
375 | JUMP_INIT(xsgetn, _IO_wdefault_xsgetn), | |
d64b6ad0 UD |
376 | JUMP_INIT(seekoff, _IO_wstr_seekoff), |
377 | JUMP_INIT(seekpos, _IO_default_seekpos), | |
bff334e0 | 378 | JUMP_INIT(setbuf, _IO_default_setbuf), |
d64b6ad0 | 379 | JUMP_INIT(sync, _IO_default_sync), |
d18ea0c5 | 380 | JUMP_INIT(doallocate, _IO_wdefault_doallocate), |
d64b6ad0 UD |
381 | JUMP_INIT(read, _IO_default_read), |
382 | JUMP_INIT(write, _IO_default_write), | |
383 | JUMP_INIT(seek, _IO_default_seek), | |
384 | JUMP_INIT(close, _IO_default_close), | |
385 | JUMP_INIT(stat, _IO_default_stat), | |
386 | JUMP_INIT(showmanyc, _IO_default_showmanyc), | |
387 | JUMP_INIT(imbue, _IO_default_imbue) | |
388 | }; |