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Commit | Line | Data |
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104b92f8 PB |
1 | /* Align/Truncate a string in a given screen width |
2 | Copyright (C) 2009-2010 Free Software Foundation, Inc. | |
3 | ||
4 | This program is free software: you can redistribute it and/or modify | |
36c7f785 PB |
5 | it under the terms of the GNU Lesser General Public License as published by |
6 | the Free Software Foundation, either version 2.1 of the License, or | |
104b92f8 PB |
7 | (at your option) any later version. |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
16 | ||
17 | /* Written by Pádraig Brady. */ | |
18 | ||
19 | #include <config.h> | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <stdio.h> | |
24 | #include <stdbool.h> | |
25 | #include <limits.h> | |
1b1f66e4 | 26 | #include <ctype.h> |
104b92f8 PB |
27 | |
28 | #include "c.h" | |
29 | #include "mbsalign.h" | |
ab753d8f | 30 | #include "strutils.h" |
104b92f8 PB |
31 | #include "widechar.h" |
32 | ||
104b92f8 PB |
33 | /* Replace non printable chars. |
34 | Note \t and \n etc. are non printable. | |
35 | Return 1 if replacement made, 0 otherwise. */ | |
36 | ||
1b1f66e4 KZ |
37 | /* |
38 | * Counts number of cells in multibyte string. For all control and | |
39 | * non-printable chars is the result width enlarged to store \x?? hex | |
40 | * sequence. See mbs_safe_encode(). | |
0c33fcbf KZ |
41 | * |
42 | * Returns: number of cells, @sz returns number of bytes. | |
1b1f66e4 | 43 | */ |
0c33fcbf | 44 | size_t mbs_safe_nwidth(const char *buf, size_t bufsz, size_t *sz) |
1b1f66e4 | 45 | { |
0c33fcbf KZ |
46 | const char *p = buf, *last = buf; |
47 | size_t width = 0, bytes = 0; | |
1b1f66e4 | 48 | |
4a423fb9 KZ |
49 | #ifdef HAVE_WIDECHAR |
50 | mbstate_t st; | |
1b1f66e4 | 51 | memset(&st, 0, sizeof(st)); |
4a423fb9 | 52 | #endif |
0c33fcbf KZ |
53 | if (p && *p && bufsz) |
54 | last = p + (bufsz - 1); | |
55 | ||
56 | while (p && *p && p <= last) { | |
43afa845 KZ |
57 | if ((p < last && *p == '\\' && *(p + 1) == 'x') |
58 | || iscntrl((unsigned char) *p)) { | |
0c33fcbf | 59 | width += 4, bytes += 4; /* *p encoded to \x?? */ |
1b1f66e4 KZ |
60 | p++; |
61 | } | |
62 | #ifdef HAVE_WIDECHAR | |
63 | else { | |
64 | wchar_t wc; | |
65 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
66 | ||
67 | if (len == 0) | |
68 | break; | |
69 | ||
70 | if (len == (size_t) -1 || len == (size_t) -2) { | |
71 | len = 1; | |
0c33fcbf KZ |
72 | if (isprint((unsigned char) *p)) |
73 | width += 1, bytes += 1; | |
74 | else | |
75 | width += 4, bytes += 4; | |
1b1f66e4 | 76 | |
0c33fcbf | 77 | } else if (!iswprint(wc)) { |
1b1f66e4 | 78 | width += len * 4; /* hex encode whole sequence */ |
0c33fcbf KZ |
79 | bytes += len * 4; |
80 | } else { | |
1b1f66e4 | 81 | width += wcwidth(wc); /* number of cells */ |
0c33fcbf KZ |
82 | bytes += len; /* number of bytes */ |
83 | } | |
1b1f66e4 KZ |
84 | p += len; |
85 | } | |
86 | #else | |
87 | else if (!isprint((unsigned char) *p)) { | |
0c33fcbf | 88 | width += 4, bytes += 4; /* *p encoded to \x?? */ |
1b1f66e4 KZ |
89 | p++; |
90 | } else { | |
0c33fcbf | 91 | width++, bytes++; |
1b1f66e4 KZ |
92 | p++; |
93 | } | |
94 | #endif | |
95 | } | |
96 | ||
0c33fcbf KZ |
97 | if (sz) |
98 | *sz = bytes; | |
1b1f66e4 KZ |
99 | return width; |
100 | } | |
101 | ||
0c33fcbf KZ |
102 | size_t mbs_safe_width(const char *s) |
103 | { | |
104 | if (!s || !*s) | |
105 | return 0; | |
106 | return mbs_safe_nwidth(s, strlen(s), NULL); | |
107 | } | |
108 | ||
1b1f66e4 | 109 | /* |
c426f70f | 110 | * Copy @s to @buf and replace control and non-printable chars with |
ff471d89 KZ |
111 | * \x?? hex sequence. The @width returns number of cells. The @safechars |
112 | * are not encoded. | |
c426f70f KZ |
113 | * |
114 | * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s))) | |
115 | * bytes. | |
1b1f66e4 | 116 | */ |
ff471d89 | 117 | char *mbs_safe_encode_to_buffer(const char *s, size_t *width, char *buf, const char *safechars) |
1b1f66e4 | 118 | { |
1b1f66e4 | 119 | const char *p = s; |
c426f70f | 120 | char *r; |
1b1f66e4 KZ |
121 | size_t sz = s ? strlen(s) : 0; |
122 | ||
4a423fb9 KZ |
123 | #ifdef HAVE_WIDECHAR |
124 | mbstate_t st; | |
125 | memset(&st, 0, sizeof(st)); | |
126 | #endif | |
c426f70f | 127 | if (!sz || !buf) |
1b1f66e4 KZ |
128 | return NULL; |
129 | ||
c426f70f | 130 | r = buf; |
1b1f66e4 KZ |
131 | *width = 0; |
132 | ||
133 | while (p && *p) { | |
ff471d89 KZ |
134 | if (safechars && strchr(safechars, *p)) { |
135 | *r++ = *p++; | |
136 | continue; | |
137 | } | |
138 | ||
43afa845 KZ |
139 | if ((*p == '\\' && *(p + 1) == 'x') |
140 | || iscntrl((unsigned char) *p)) { | |
1b1f66e4 KZ |
141 | sprintf(r, "\\x%02x", (unsigned char) *p); |
142 | r += 4; | |
143 | *width += 4; | |
144 | p++; | |
145 | } | |
146 | #ifdef HAVE_WIDECHAR | |
147 | else { | |
148 | wchar_t wc; | |
149 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
150 | ||
151 | if (len == 0) | |
152 | break; /* end of string */ | |
153 | ||
154 | if (len == (size_t) -1 || len == (size_t) -2) { | |
155 | len = 1; | |
156 | /* | |
157 | * Not valid multibyte sequence -- maybe it's | |
158 | * printable char according to the current locales. | |
159 | */ | |
160 | if (!isprint((unsigned char) *p)) { | |
161 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
162 | r += 4; | |
163 | *width += 4; | |
164 | } else { | |
4a423fb9 | 165 | (*width)++; |
1b1f66e4 KZ |
166 | *r++ = *p; |
167 | } | |
168 | } else if (!iswprint(wc)) { | |
169 | size_t i; | |
170 | for (i = 0; i < len; i++) { | |
edf86d6b | 171 | sprintf(r, "\\x%02x", (unsigned char) p[i]); |
1b1f66e4 KZ |
172 | r += 4; |
173 | *width += 4; | |
174 | } | |
175 | } else { | |
176 | memcpy(r, p, len); | |
177 | r += len; | |
178 | *width += wcwidth(wc); | |
179 | } | |
180 | p += len; | |
181 | } | |
182 | #else | |
183 | else if (!isprint((unsigned char) *p)) { | |
184 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
185 | p++; | |
186 | r += 4; | |
187 | *width += 4; | |
188 | } else { | |
189 | *r++ = *p++; | |
4a423fb9 | 190 | (*width)++; |
1b1f66e4 KZ |
191 | } |
192 | #endif | |
193 | } | |
194 | ||
195 | *r = '\0'; | |
c426f70f KZ |
196 | return buf; |
197 | } | |
198 | ||
365ed9f6 KZ |
199 | /* |
200 | * Copy @s to @buf and replace broken sequences to \x?? hex sequence. The | |
201 | * @width returns number of cells. The @safechars are not encoded. | |
202 | * | |
203 | * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s))) | |
204 | * bytes. | |
205 | */ | |
206 | char *mbs_invalid_encode_to_buffer(const char *s, size_t *width, char *buf) | |
207 | { | |
208 | const char *p = s; | |
209 | char *r; | |
210 | size_t sz = s ? strlen(s) : 0; | |
211 | ||
212 | #ifdef HAVE_WIDECHAR | |
213 | mbstate_t st; | |
214 | memset(&st, 0, sizeof(st)); | |
215 | #endif | |
216 | if (!sz || !buf) | |
217 | return NULL; | |
218 | ||
219 | r = buf; | |
220 | *width = 0; | |
221 | ||
222 | while (p && *p) { | |
223 | #ifdef HAVE_WIDECHAR | |
224 | wchar_t wc; | |
225 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
2ba65f37 VD |
226 | #else |
227 | size_t len = 1; | |
228 | #endif | |
365ed9f6 KZ |
229 | |
230 | if (len == 0) | |
231 | break; /* end of string */ | |
232 | ||
233 | if (len == (size_t) -1 || len == (size_t) -2) { | |
234 | len = 1; | |
235 | /* | |
236 | * Not valid multibyte sequence -- maybe it's | |
237 | * printable char according to the current locales. | |
238 | */ | |
239 | if (!isprint((unsigned char) *p)) { | |
240 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
241 | r += 4; | |
242 | *width += 4; | |
243 | } else { | |
244 | (*width)++; | |
245 | *r++ = *p; | |
246 | } | |
43afa845 KZ |
247 | } else if (*p == '\\' && *(p + 1) == 'x') { |
248 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
249 | r += 4; | |
250 | *width += 4; | |
365ed9f6 KZ |
251 | } else { |
252 | memcpy(r, p, len); | |
253 | r += len; | |
254 | *width += wcwidth(wc); | |
255 | } | |
256 | p += len; | |
365ed9f6 KZ |
257 | } |
258 | ||
259 | *r = '\0'; | |
260 | return buf; | |
261 | } | |
262 | ||
c426f70f KZ |
263 | size_t mbs_safe_encode_size(size_t bytes) |
264 | { | |
265 | return (bytes * 4) + 1; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Returns allocated string where all control and non-printable chars are | |
270 | * replaced with \x?? hex sequence. | |
271 | */ | |
272 | char *mbs_safe_encode(const char *s, size_t *width) | |
273 | { | |
274 | size_t sz = s ? strlen(s) : 0; | |
f4d37838 | 275 | char *buf, *ret = NULL; |
c426f70f KZ |
276 | |
277 | if (!sz) | |
278 | return NULL; | |
279 | buf = malloc(mbs_safe_encode_size(sz)); | |
a86b9f25 KZ |
280 | if (buf) |
281 | ret = mbs_safe_encode_to_buffer(s, width, buf, NULL); | |
282 | if (!ret) | |
283 | free(buf); | |
284 | return ret; | |
1b1f66e4 KZ |
285 | } |
286 | ||
365ed9f6 KZ |
287 | /* |
288 | * Returns allocated string where all broken widechars chars are | |
289 | * replaced with \x?? hex sequence. | |
290 | */ | |
291 | char *mbs_invalid_encode(const char *s, size_t *width) | |
292 | { | |
293 | size_t sz = s ? strlen(s) : 0; | |
294 | char *buf, *ret = NULL; | |
295 | ||
296 | if (!sz) | |
297 | return NULL; | |
298 | buf = malloc(mbs_safe_encode_size(sz)); | |
299 | if (buf) | |
300 | ret = mbs_invalid_encode_to_buffer(s, width, buf); | |
301 | if (!ret) | |
302 | free(buf); | |
303 | return ret; | |
304 | } | |
305 | ||
4a423fb9 KZ |
306 | #ifdef HAVE_WIDECHAR |
307 | ||
104b92f8 PB |
308 | static bool |
309 | wc_ensure_printable (wchar_t *wchars) | |
310 | { | |
311 | bool replaced = false; | |
312 | wchar_t *wc = wchars; | |
313 | while (*wc) | |
314 | { | |
315 | if (!iswprint ((wint_t) *wc)) | |
316 | { | |
317 | *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */ | |
318 | replaced = true; | |
319 | } | |
320 | wc++; | |
321 | } | |
322 | return replaced; | |
323 | } | |
324 | ||
325 | /* Truncate wchar string to width cells. | |
326 | * Returns number of cells used. */ | |
327 | ||
328 | static size_t | |
329 | wc_truncate (wchar_t *wc, size_t width) | |
330 | { | |
331 | size_t cells = 0; | |
332 | int next_cells = 0; | |
333 | ||
334 | while (*wc) | |
335 | { | |
336 | next_cells = wcwidth (*wc); | |
337 | if (next_cells == -1) /* non printable */ | |
338 | { | |
339 | *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */ | |
340 | next_cells = 1; | |
341 | } | |
342 | if (cells + next_cells > width) | |
343 | break; | |
d94c5198 | 344 | |
104b92f8 PB |
345 | cells += next_cells; |
346 | wc++; | |
347 | } | |
348 | *wc = L'\0'; | |
349 | return cells; | |
350 | } | |
351 | ||
352 | /* FIXME: move this function to gnulib as it's missing on: | |
353 | OpenBSD 3.8, IRIX 5.3, Solaris 2.5.1, mingw, BeOS */ | |
354 | ||
355 | static int | |
356 | rpl_wcswidth (const wchar_t *s, size_t n) | |
357 | { | |
358 | int ret = 0; | |
359 | ||
360 | while (n-- > 0 && *s != L'\0') | |
361 | { | |
362 | int nwidth = wcwidth (*s++); | |
363 | if (nwidth == -1) /* non printable */ | |
364 | return -1; | |
365 | if (ret > (INT_MAX - nwidth)) /* overflow */ | |
366 | return -1; | |
367 | ret += nwidth; | |
368 | } | |
369 | ||
370 | return ret; | |
371 | } | |
4a423fb9 | 372 | #endif /* HAVE_WIDECHAR */ |
104b92f8 | 373 | |
5f94ca33 KZ |
374 | /* Truncate multi-byte string to @width and returns number of |
375 | * bytes of the new string @str, and in @width returns number | |
376 | * of cells. | |
377 | */ | |
378 | size_t | |
379 | mbs_truncate(char *str, size_t *width) | |
380 | { | |
2897f29a | 381 | ssize_t bytes = strlen(str); |
5f94ca33 | 382 | #ifdef HAVE_WIDECHAR |
2897f29a | 383 | ssize_t sz = mbstowcs(NULL, str, 0); |
5f94ca33 KZ |
384 | wchar_t *wcs = NULL; |
385 | ||
2897f29a | 386 | if (sz == (ssize_t) -1) |
5f94ca33 KZ |
387 | goto done; |
388 | ||
d94c5198 | 389 | wcs = calloc(1, (sz + 1) * sizeof(wchar_t)); |
5f94ca33 KZ |
390 | if (!wcs) |
391 | goto done; | |
392 | ||
393 | if (!mbstowcs(wcs, str, sz)) | |
394 | goto done; | |
395 | *width = wc_truncate(wcs, *width); | |
396 | bytes = wcstombs(str, wcs, bytes); | |
397 | done: | |
398 | free(wcs); | |
399 | #else | |
6426f926 | 400 | if (bytes >= 0 && *width < (size_t) bytes) |
5f94ca33 KZ |
401 | bytes = *width; |
402 | #endif | |
403 | if (bytes >= 0) | |
404 | str[bytes] = '\0'; | |
405 | return bytes; | |
406 | } | |
407 | ||
104b92f8 PB |
408 | /* Write N_SPACES space characters to DEST while ensuring |
409 | nothing is written beyond DEST_END. A terminating NUL | |
410 | is always added to DEST. | |
411 | A pointer to the terminating NUL is returned. */ | |
412 | ||
413 | static char* | |
57867795 | 414 | mbs_align_pad (char *dest, const char* dest_end, size_t n_spaces, int padchar) |
104b92f8 PB |
415 | { |
416 | /* FIXME: Should we pad with "figure space" (\u2007) | |
417 | if non ascii data present? */ | |
efb2fe5f | 418 | for (/* nothing */; n_spaces && (dest < dest_end); n_spaces--) |
57867795 | 419 | *dest++ = padchar; |
104b92f8 PB |
420 | *dest = '\0'; |
421 | return dest; | |
422 | } | |
423 | ||
57867795 KZ |
424 | size_t |
425 | mbsalign (const char *src, char *dest, size_t dest_size, | |
426 | size_t *width, mbs_align_t align, int flags) | |
427 | { | |
428 | return mbsalign_with_padding(src, dest, dest_size, width, align, flags, ' '); | |
429 | } | |
430 | ||
104b92f8 PB |
431 | /* Align a string, SRC, in a field of *WIDTH columns, handling multi-byte |
432 | characters; write the result into the DEST_SIZE-byte buffer, DEST. | |
433 | ALIGNMENT specifies whether to left- or right-justify or to center. | |
434 | If SRC requires more than *WIDTH columns, truncate it to fit. | |
435 | When centering, the number of trailing spaces may be one less than the | |
436 | number of leading spaces. The FLAGS parameter is unused at present. | |
437 | Return the length in bytes required for the final result, not counting | |
438 | the trailing NUL. A return value of DEST_SIZE or larger means there | |
439 | wasn't enough space. DEST will be NUL terminated in any case. | |
440 | Return (size_t) -1 upon error (invalid multi-byte sequence in SRC, | |
441 | or malloc failure), unless MBA_UNIBYTE_FALLBACK is specified. | |
442 | Update *WIDTH to indicate how many columns were used before padding. */ | |
443 | ||
444 | size_t | |
57867795 | 445 | mbsalign_with_padding (const char *src, char *dest, size_t dest_size, |
c191740c KZ |
446 | size_t *width, mbs_align_t align, |
447 | #ifdef HAVE_WIDECHAR | |
448 | int flags, | |
449 | #else | |
450 | int flags __attribute__((__unused__)), | |
451 | #endif | |
57867795 | 452 | int padchar) |
104b92f8 PB |
453 | { |
454 | size_t ret = -1; | |
455 | size_t src_size = strlen (src) + 1; | |
456 | char *newstr = NULL; | |
457 | wchar_t *str_wc = NULL; | |
458 | const char *str_to_print = src; | |
459 | size_t n_cols = src_size - 1; | |
460 | size_t n_used_bytes = n_cols; /* Not including NUL */ | |
3acc206d | 461 | size_t n_spaces = 0, space_left; |
6426f926 KZ |
462 | |
463 | #ifdef HAVE_WIDECHAR | |
104b92f8 PB |
464 | bool conversion = false; |
465 | bool wc_enabled = false; | |
466 | ||
104b92f8 PB |
467 | /* In multi-byte locales convert to wide characters |
468 | to allow easy truncation. Also determine number | |
469 | of screen columns used. */ | |
470 | if (MB_CUR_MAX > 1) | |
471 | { | |
472 | size_t src_chars = mbstowcs (NULL, src, 0); | |
473 | if (src_chars == (size_t) -1) | |
474 | { | |
475 | if (flags & MBA_UNIBYTE_FALLBACK) | |
476 | goto mbsalign_unibyte; | |
477 | else | |
478 | goto mbsalign_cleanup; | |
479 | } | |
480 | src_chars += 1; /* make space for NUL */ | |
481 | str_wc = malloc (src_chars * sizeof (wchar_t)); | |
482 | if (str_wc == NULL) | |
483 | { | |
484 | if (flags & MBA_UNIBYTE_FALLBACK) | |
485 | goto mbsalign_unibyte; | |
486 | else | |
487 | goto mbsalign_cleanup; | |
488 | } | |
489 | if (mbstowcs (str_wc, src, src_chars) != 0) | |
490 | { | |
491 | str_wc[src_chars - 1] = L'\0'; | |
492 | wc_enabled = true; | |
493 | conversion = wc_ensure_printable (str_wc); | |
494 | n_cols = rpl_wcswidth (str_wc, src_chars); | |
495 | } | |
496 | } | |
497 | ||
498 | /* If we transformed or need to truncate the source string | |
499 | then create a modified copy of it. */ | |
500 | if (wc_enabled && (conversion || (n_cols > *width))) | |
501 | { | |
502 | if (conversion) | |
503 | { | |
504 | /* May have increased the size by converting | |
505 | \t to \uFFFD for example. */ | |
506 | src_size = wcstombs(NULL, str_wc, 0) + 1; | |
507 | } | |
508 | newstr = malloc (src_size); | |
509 | if (newstr == NULL) | |
510 | { | |
511 | if (flags & MBA_UNIBYTE_FALLBACK) | |
512 | goto mbsalign_unibyte; | |
513 | else | |
514 | goto mbsalign_cleanup; | |
515 | } | |
516 | str_to_print = newstr; | |
517 | n_cols = wc_truncate (str_wc, *width); | |
518 | n_used_bytes = wcstombs (newstr, str_wc, src_size); | |
519 | } | |
104b92f8 PB |
520 | |
521 | mbsalign_unibyte: | |
6426f926 | 522 | #endif |
104b92f8 PB |
523 | |
524 | if (n_cols > *width) /* Unibyte truncation required. */ | |
525 | { | |
526 | n_cols = *width; | |
527 | n_used_bytes = n_cols; | |
528 | } | |
529 | ||
530 | if (*width > n_cols) /* Padding required. */ | |
531 | n_spaces = *width - n_cols; | |
532 | ||
533 | /* indicate to caller how many cells needed (not including padding). */ | |
534 | *width = n_cols; | |
535 | ||
536 | /* indicate to caller how many bytes needed (not including NUL). */ | |
537 | ret = n_used_bytes + (n_spaces * 1); | |
538 | ||
539 | /* Write as much NUL terminated output to DEST as possible. */ | |
540 | if (dest_size != 0) | |
541 | { | |
542 | char *dest_end = dest + dest_size - 1; | |
f7ff0414 SK |
543 | size_t start_spaces; |
544 | size_t end_spaces; | |
104b92f8 PB |
545 | |
546 | switch (align) | |
547 | { | |
548 | case MBS_ALIGN_CENTER: | |
549 | start_spaces = n_spaces / 2 + n_spaces % 2; | |
550 | end_spaces = n_spaces / 2; | |
551 | break; | |
552 | case MBS_ALIGN_LEFT: | |
553 | start_spaces = 0; | |
554 | end_spaces = n_spaces; | |
555 | break; | |
556 | case MBS_ALIGN_RIGHT: | |
557 | start_spaces = n_spaces; | |
558 | end_spaces = 0; | |
559 | break; | |
ce7b11a9 SK |
560 | default: |
561 | abort(); | |
104b92f8 PB |
562 | } |
563 | ||
57867795 | 564 | dest = mbs_align_pad (dest, dest_end, start_spaces, padchar); |
3acc206d | 565 | space_left = dest_end - dest; |
104b92f8 | 566 | dest = mempcpy (dest, str_to_print, min (n_used_bytes, space_left)); |
57867795 | 567 | mbs_align_pad (dest, dest_end, end_spaces, padchar); |
104b92f8 | 568 | } |
6426f926 | 569 | #ifdef HAVE_WIDECHAR |
104b92f8 | 570 | mbsalign_cleanup: |
6426f926 | 571 | #endif |
104b92f8 PB |
572 | free (str_wc); |
573 | free (newstr); | |
574 | ||
575 | return ret; | |
576 | } |