]>
Commit | Line | Data |
---|---|---|
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 | ||
104b92f8 PB |
19 | #include <stdlib.h> |
20 | #include <string.h> | |
21 | #include <stdio.h> | |
22 | #include <stdbool.h> | |
23 | #include <limits.h> | |
1b1f66e4 | 24 | #include <ctype.h> |
104b92f8 PB |
25 | |
26 | #include "c.h" | |
27 | #include "mbsalign.h" | |
ab753d8f | 28 | #include "strutils.h" |
104b92f8 PB |
29 | #include "widechar.h" |
30 | ||
0957fdca KZ |
31 | /* |
32 | * Counts number of cells in multibyte string. All control and | |
33 | * non-printable chars are ignored. | |
34 | * | |
35 | * Returns: number of cells. | |
36 | */ | |
37 | size_t mbs_nwidth(const char *buf, size_t bufsz) | |
38 | { | |
39 | const char *p = buf, *last = buf; | |
40 | size_t width = 0; | |
41 | ||
42 | #ifdef HAVE_WIDECHAR | |
43 | mbstate_t st; | |
44 | memset(&st, 0, sizeof(st)); | |
45 | #endif | |
46 | if (p && *p && bufsz) | |
47 | last = p + (bufsz - 1); | |
48 | ||
49 | while (p && *p && p <= last) { | |
50 | if (iscntrl((unsigned char) *p)) { | |
51 | p++; | |
52 | ||
53 | /* try detect "\e[x;ym" and skip on success */ | |
54 | if (*p && *p == '[') { | |
55 | const char *e = p; | |
56 | while (*e && e < last && *e != 'm') | |
57 | e++; | |
58 | if (*e == 'm') | |
59 | p = e + 1; | |
60 | } | |
61 | continue; | |
62 | } | |
63 | #ifdef HAVE_WIDECHAR | |
64 | wchar_t wc; | |
65 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
66 | ||
67 | if (len == 0) | |
68 | break; | |
69 | if (len > 0 && iswprint(wc)) { | |
70 | int x = wcwidth(wc); | |
71 | if (x > 0) | |
72 | width += x; | |
73 | } else if (len == (size_t) -1 || len == (size_t) -2) | |
74 | len = 1; | |
75 | p += len; | |
76 | #else | |
77 | if (isprint((unsigned char) *p)) | |
78 | width++; | |
79 | p++; | |
80 | #endif | |
81 | } | |
82 | ||
83 | return width; | |
84 | } | |
85 | ||
86 | size_t mbs_width(const char *s) | |
87 | { | |
88 | if (!s || !*s) | |
89 | return 0; | |
90 | return mbs_nwidth(s, strlen(s)); | |
91 | } | |
104b92f8 | 92 | |
1b1f66e4 KZ |
93 | /* |
94 | * Counts number of cells in multibyte string. For all control and | |
95 | * non-printable chars is the result width enlarged to store \x?? hex | |
96 | * sequence. See mbs_safe_encode(). | |
0c33fcbf KZ |
97 | * |
98 | * Returns: number of cells, @sz returns number of bytes. | |
1b1f66e4 | 99 | */ |
0c33fcbf | 100 | size_t mbs_safe_nwidth(const char *buf, size_t bufsz, size_t *sz) |
1b1f66e4 | 101 | { |
0c33fcbf KZ |
102 | const char *p = buf, *last = buf; |
103 | size_t width = 0, bytes = 0; | |
1b1f66e4 | 104 | |
4a423fb9 KZ |
105 | #ifdef HAVE_WIDECHAR |
106 | mbstate_t st; | |
1b1f66e4 | 107 | memset(&st, 0, sizeof(st)); |
4a423fb9 | 108 | #endif |
0c33fcbf KZ |
109 | if (p && *p && bufsz) |
110 | last = p + (bufsz - 1); | |
111 | ||
112 | while (p && *p && p <= last) { | |
43afa845 KZ |
113 | if ((p < last && *p == '\\' && *(p + 1) == 'x') |
114 | || iscntrl((unsigned char) *p)) { | |
0c33fcbf | 115 | width += 4, bytes += 4; /* *p encoded to \x?? */ |
1b1f66e4 KZ |
116 | p++; |
117 | } | |
118 | #ifdef HAVE_WIDECHAR | |
119 | else { | |
120 | wchar_t wc; | |
121 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
122 | ||
123 | if (len == 0) | |
124 | break; | |
125 | ||
126 | if (len == (size_t) -1 || len == (size_t) -2) { | |
127 | len = 1; | |
0c33fcbf KZ |
128 | if (isprint((unsigned char) *p)) |
129 | width += 1, bytes += 1; | |
130 | else | |
131 | width += 4, bytes += 4; | |
1b1f66e4 | 132 | |
0c33fcbf | 133 | } else if (!iswprint(wc)) { |
1b1f66e4 | 134 | width += len * 4; /* hex encode whole sequence */ |
0c33fcbf KZ |
135 | bytes += len * 4; |
136 | } else { | |
1b1f66e4 | 137 | width += wcwidth(wc); /* number of cells */ |
0c33fcbf KZ |
138 | bytes += len; /* number of bytes */ |
139 | } | |
1b1f66e4 KZ |
140 | p += len; |
141 | } | |
142 | #else | |
143 | else if (!isprint((unsigned char) *p)) { | |
0c33fcbf | 144 | width += 4, bytes += 4; /* *p encoded to \x?? */ |
1b1f66e4 KZ |
145 | p++; |
146 | } else { | |
0c33fcbf | 147 | width++, bytes++; |
1b1f66e4 KZ |
148 | p++; |
149 | } | |
150 | #endif | |
151 | } | |
152 | ||
0c33fcbf KZ |
153 | if (sz) |
154 | *sz = bytes; | |
1b1f66e4 KZ |
155 | return width; |
156 | } | |
157 | ||
0c33fcbf KZ |
158 | size_t mbs_safe_width(const char *s) |
159 | { | |
160 | if (!s || !*s) | |
161 | return 0; | |
162 | return mbs_safe_nwidth(s, strlen(s), NULL); | |
163 | } | |
164 | ||
1b1f66e4 | 165 | /* |
c426f70f | 166 | * Copy @s to @buf and replace control and non-printable chars with |
ff471d89 KZ |
167 | * \x?? hex sequence. The @width returns number of cells. The @safechars |
168 | * are not encoded. | |
c426f70f KZ |
169 | * |
170 | * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s))) | |
171 | * bytes. | |
1b1f66e4 | 172 | */ |
ff471d89 | 173 | char *mbs_safe_encode_to_buffer(const char *s, size_t *width, char *buf, const char *safechars) |
1b1f66e4 | 174 | { |
1b1f66e4 | 175 | const char *p = s; |
c426f70f | 176 | char *r; |
1b1f66e4 KZ |
177 | size_t sz = s ? strlen(s) : 0; |
178 | ||
4a423fb9 KZ |
179 | #ifdef HAVE_WIDECHAR |
180 | mbstate_t st; | |
181 | memset(&st, 0, sizeof(st)); | |
182 | #endif | |
c426f70f | 183 | if (!sz || !buf) |
1b1f66e4 KZ |
184 | return NULL; |
185 | ||
c426f70f | 186 | r = buf; |
1b1f66e4 KZ |
187 | *width = 0; |
188 | ||
189 | while (p && *p) { | |
ff471d89 KZ |
190 | if (safechars && strchr(safechars, *p)) { |
191 | *r++ = *p++; | |
192 | continue; | |
193 | } | |
194 | ||
43afa845 KZ |
195 | if ((*p == '\\' && *(p + 1) == 'x') |
196 | || iscntrl((unsigned char) *p)) { | |
1b1f66e4 KZ |
197 | sprintf(r, "\\x%02x", (unsigned char) *p); |
198 | r += 4; | |
199 | *width += 4; | |
200 | p++; | |
201 | } | |
202 | #ifdef HAVE_WIDECHAR | |
203 | else { | |
204 | wchar_t wc; | |
205 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
206 | ||
207 | if (len == 0) | |
208 | break; /* end of string */ | |
209 | ||
210 | if (len == (size_t) -1 || len == (size_t) -2) { | |
211 | len = 1; | |
212 | /* | |
213 | * Not valid multibyte sequence -- maybe it's | |
214 | * printable char according to the current locales. | |
215 | */ | |
216 | if (!isprint((unsigned char) *p)) { | |
217 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
218 | r += 4; | |
219 | *width += 4; | |
220 | } else { | |
4a423fb9 | 221 | (*width)++; |
1b1f66e4 KZ |
222 | *r++ = *p; |
223 | } | |
224 | } else if (!iswprint(wc)) { | |
225 | size_t i; | |
226 | for (i = 0; i < len; i++) { | |
edf86d6b | 227 | sprintf(r, "\\x%02x", (unsigned char) p[i]); |
1b1f66e4 KZ |
228 | r += 4; |
229 | *width += 4; | |
230 | } | |
231 | } else { | |
232 | memcpy(r, p, len); | |
233 | r += len; | |
234 | *width += wcwidth(wc); | |
235 | } | |
236 | p += len; | |
237 | } | |
238 | #else | |
239 | else if (!isprint((unsigned char) *p)) { | |
240 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
241 | p++; | |
242 | r += 4; | |
243 | *width += 4; | |
244 | } else { | |
245 | *r++ = *p++; | |
4a423fb9 | 246 | (*width)++; |
1b1f66e4 KZ |
247 | } |
248 | #endif | |
249 | } | |
250 | ||
251 | *r = '\0'; | |
c426f70f KZ |
252 | return buf; |
253 | } | |
254 | ||
365ed9f6 KZ |
255 | /* |
256 | * Copy @s to @buf and replace broken sequences to \x?? hex sequence. The | |
257 | * @width returns number of cells. The @safechars are not encoded. | |
258 | * | |
259 | * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s))) | |
260 | * bytes. | |
261 | */ | |
262 | char *mbs_invalid_encode_to_buffer(const char *s, size_t *width, char *buf) | |
263 | { | |
264 | const char *p = s; | |
265 | char *r; | |
266 | size_t sz = s ? strlen(s) : 0; | |
267 | ||
268 | #ifdef HAVE_WIDECHAR | |
269 | mbstate_t st; | |
270 | memset(&st, 0, sizeof(st)); | |
271 | #endif | |
272 | if (!sz || !buf) | |
273 | return NULL; | |
274 | ||
275 | r = buf; | |
276 | *width = 0; | |
277 | ||
278 | while (p && *p) { | |
279 | #ifdef HAVE_WIDECHAR | |
280 | wchar_t wc; | |
281 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
2ba65f37 VD |
282 | #else |
283 | size_t len = 1; | |
284 | #endif | |
365ed9f6 KZ |
285 | |
286 | if (len == 0) | |
287 | break; /* end of string */ | |
288 | ||
289 | if (len == (size_t) -1 || len == (size_t) -2) { | |
290 | len = 1; | |
291 | /* | |
292 | * Not valid multibyte sequence -- maybe it's | |
293 | * printable char according to the current locales. | |
294 | */ | |
295 | if (!isprint((unsigned char) *p)) { | |
296 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
297 | r += 4; | |
298 | *width += 4; | |
299 | } else { | |
300 | (*width)++; | |
301 | *r++ = *p; | |
302 | } | |
43afa845 KZ |
303 | } else if (*p == '\\' && *(p + 1) == 'x') { |
304 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
305 | r += 4; | |
306 | *width += 4; | |
365ed9f6 KZ |
307 | } else { |
308 | memcpy(r, p, len); | |
309 | r += len; | |
310 | *width += wcwidth(wc); | |
311 | } | |
312 | p += len; | |
365ed9f6 KZ |
313 | } |
314 | ||
315 | *r = '\0'; | |
316 | return buf; | |
317 | } | |
318 | ||
c426f70f KZ |
319 | size_t mbs_safe_encode_size(size_t bytes) |
320 | { | |
321 | return (bytes * 4) + 1; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Returns allocated string where all control and non-printable chars are | |
326 | * replaced with \x?? hex sequence. | |
327 | */ | |
328 | char *mbs_safe_encode(const char *s, size_t *width) | |
329 | { | |
330 | size_t sz = s ? strlen(s) : 0; | |
f4d37838 | 331 | char *buf, *ret = NULL; |
c426f70f KZ |
332 | |
333 | if (!sz) | |
334 | return NULL; | |
335 | buf = malloc(mbs_safe_encode_size(sz)); | |
a86b9f25 KZ |
336 | if (buf) |
337 | ret = mbs_safe_encode_to_buffer(s, width, buf, NULL); | |
338 | if (!ret) | |
339 | free(buf); | |
340 | return ret; | |
1b1f66e4 KZ |
341 | } |
342 | ||
365ed9f6 KZ |
343 | /* |
344 | * Returns allocated string where all broken widechars chars are | |
345 | * replaced with \x?? hex sequence. | |
346 | */ | |
347 | char *mbs_invalid_encode(const char *s, size_t *width) | |
348 | { | |
349 | size_t sz = s ? strlen(s) : 0; | |
350 | char *buf, *ret = NULL; | |
351 | ||
352 | if (!sz) | |
353 | return NULL; | |
354 | buf = malloc(mbs_safe_encode_size(sz)); | |
355 | if (buf) | |
356 | ret = mbs_invalid_encode_to_buffer(s, width, buf); | |
357 | if (!ret) | |
358 | free(buf); | |
359 | return ret; | |
360 | } | |
361 | ||
4a423fb9 KZ |
362 | #ifdef HAVE_WIDECHAR |
363 | ||
104b92f8 PB |
364 | static bool |
365 | wc_ensure_printable (wchar_t *wchars) | |
366 | { | |
367 | bool replaced = false; | |
368 | wchar_t *wc = wchars; | |
369 | while (*wc) | |
370 | { | |
371 | if (!iswprint ((wint_t) *wc)) | |
372 | { | |
373 | *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */ | |
374 | replaced = true; | |
375 | } | |
376 | wc++; | |
377 | } | |
378 | return replaced; | |
379 | } | |
380 | ||
381 | /* Truncate wchar string to width cells. | |
382 | * Returns number of cells used. */ | |
383 | ||
384 | static size_t | |
385 | wc_truncate (wchar_t *wc, size_t width) | |
386 | { | |
387 | size_t cells = 0; | |
388 | int next_cells = 0; | |
389 | ||
390 | while (*wc) | |
391 | { | |
392 | next_cells = wcwidth (*wc); | |
393 | if (next_cells == -1) /* non printable */ | |
394 | { | |
395 | *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */ | |
396 | next_cells = 1; | |
397 | } | |
398 | if (cells + next_cells > width) | |
399 | break; | |
d94c5198 | 400 | |
104b92f8 PB |
401 | cells += next_cells; |
402 | wc++; | |
403 | } | |
404 | *wc = L'\0'; | |
405 | return cells; | |
406 | } | |
407 | ||
104b92f8 PB |
408 | static int |
409 | rpl_wcswidth (const wchar_t *s, size_t n) | |
410 | { | |
411 | int ret = 0; | |
412 | ||
413 | while (n-- > 0 && *s != L'\0') | |
414 | { | |
415 | int nwidth = wcwidth (*s++); | |
416 | if (nwidth == -1) /* non printable */ | |
417 | return -1; | |
418 | if (ret > (INT_MAX - nwidth)) /* overflow */ | |
419 | return -1; | |
420 | ret += nwidth; | |
421 | } | |
422 | ||
423 | return ret; | |
424 | } | |
4a423fb9 | 425 | #endif /* HAVE_WIDECHAR */ |
104b92f8 | 426 | |
5f94ca33 KZ |
427 | /* Truncate multi-byte string to @width and returns number of |
428 | * bytes of the new string @str, and in @width returns number | |
429 | * of cells. | |
430 | */ | |
431 | size_t | |
432 | mbs_truncate(char *str, size_t *width) | |
433 | { | |
2897f29a | 434 | ssize_t bytes = strlen(str); |
5f94ca33 | 435 | #ifdef HAVE_WIDECHAR |
2897f29a | 436 | ssize_t sz = mbstowcs(NULL, str, 0); |
5f94ca33 KZ |
437 | wchar_t *wcs = NULL; |
438 | ||
2897f29a | 439 | if (sz == (ssize_t) -1) |
5f94ca33 KZ |
440 | goto done; |
441 | ||
d94c5198 | 442 | wcs = calloc(1, (sz + 1) * sizeof(wchar_t)); |
5f94ca33 KZ |
443 | if (!wcs) |
444 | goto done; | |
445 | ||
446 | if (!mbstowcs(wcs, str, sz)) | |
447 | goto done; | |
448 | *width = wc_truncate(wcs, *width); | |
449 | bytes = wcstombs(str, wcs, bytes); | |
450 | done: | |
451 | free(wcs); | |
452 | #else | |
6426f926 | 453 | if (bytes >= 0 && *width < (size_t) bytes) |
5f94ca33 KZ |
454 | bytes = *width; |
455 | #endif | |
456 | if (bytes >= 0) | |
457 | str[bytes] = '\0'; | |
458 | return bytes; | |
459 | } | |
460 | ||
104b92f8 PB |
461 | /* Write N_SPACES space characters to DEST while ensuring |
462 | nothing is written beyond DEST_END. A terminating NUL | |
463 | is always added to DEST. | |
464 | A pointer to the terminating NUL is returned. */ | |
465 | ||
466 | static char* | |
57867795 | 467 | mbs_align_pad (char *dest, const char* dest_end, size_t n_spaces, int padchar) |
104b92f8 | 468 | { |
efb2fe5f | 469 | for (/* nothing */; n_spaces && (dest < dest_end); n_spaces--) |
57867795 | 470 | *dest++ = padchar; |
104b92f8 PB |
471 | *dest = '\0'; |
472 | return dest; | |
473 | } | |
474 | ||
57867795 KZ |
475 | size_t |
476 | mbsalign (const char *src, char *dest, size_t dest_size, | |
477 | size_t *width, mbs_align_t align, int flags) | |
478 | { | |
479 | return mbsalign_with_padding(src, dest, dest_size, width, align, flags, ' '); | |
480 | } | |
481 | ||
104b92f8 PB |
482 | /* Align a string, SRC, in a field of *WIDTH columns, handling multi-byte |
483 | characters; write the result into the DEST_SIZE-byte buffer, DEST. | |
484 | ALIGNMENT specifies whether to left- or right-justify or to center. | |
485 | If SRC requires more than *WIDTH columns, truncate it to fit. | |
486 | When centering, the number of trailing spaces may be one less than the | |
487 | number of leading spaces. The FLAGS parameter is unused at present. | |
488 | Return the length in bytes required for the final result, not counting | |
489 | the trailing NUL. A return value of DEST_SIZE or larger means there | |
490 | wasn't enough space. DEST will be NUL terminated in any case. | |
491 | Return (size_t) -1 upon error (invalid multi-byte sequence in SRC, | |
492 | or malloc failure), unless MBA_UNIBYTE_FALLBACK is specified. | |
493 | Update *WIDTH to indicate how many columns were used before padding. */ | |
494 | ||
495 | size_t | |
57867795 | 496 | mbsalign_with_padding (const char *src, char *dest, size_t dest_size, |
c191740c KZ |
497 | size_t *width, mbs_align_t align, |
498 | #ifdef HAVE_WIDECHAR | |
499 | int flags, | |
500 | #else | |
501 | int flags __attribute__((__unused__)), | |
502 | #endif | |
57867795 | 503 | int padchar) |
104b92f8 PB |
504 | { |
505 | size_t ret = -1; | |
506 | size_t src_size = strlen (src) + 1; | |
507 | char *newstr = NULL; | |
508 | wchar_t *str_wc = NULL; | |
509 | const char *str_to_print = src; | |
510 | size_t n_cols = src_size - 1; | |
511 | size_t n_used_bytes = n_cols; /* Not including NUL */ | |
3acc206d | 512 | size_t n_spaces = 0, space_left; |
6426f926 KZ |
513 | |
514 | #ifdef HAVE_WIDECHAR | |
104b92f8 PB |
515 | bool conversion = false; |
516 | bool wc_enabled = false; | |
517 | ||
104b92f8 PB |
518 | /* In multi-byte locales convert to wide characters |
519 | to allow easy truncation. Also determine number | |
520 | of screen columns used. */ | |
521 | if (MB_CUR_MAX > 1) | |
522 | { | |
523 | size_t src_chars = mbstowcs (NULL, src, 0); | |
524 | if (src_chars == (size_t) -1) | |
525 | { | |
526 | if (flags & MBA_UNIBYTE_FALLBACK) | |
527 | goto mbsalign_unibyte; | |
528 | else | |
529 | goto mbsalign_cleanup; | |
530 | } | |
531 | src_chars += 1; /* make space for NUL */ | |
532 | str_wc = malloc (src_chars * sizeof (wchar_t)); | |
533 | if (str_wc == NULL) | |
534 | { | |
535 | if (flags & MBA_UNIBYTE_FALLBACK) | |
536 | goto mbsalign_unibyte; | |
537 | else | |
538 | goto mbsalign_cleanup; | |
539 | } | |
540 | if (mbstowcs (str_wc, src, src_chars) != 0) | |
541 | { | |
542 | str_wc[src_chars - 1] = L'\0'; | |
543 | wc_enabled = true; | |
544 | conversion = wc_ensure_printable (str_wc); | |
545 | n_cols = rpl_wcswidth (str_wc, src_chars); | |
546 | } | |
547 | } | |
548 | ||
549 | /* If we transformed or need to truncate the source string | |
550 | then create a modified copy of it. */ | |
551 | if (wc_enabled && (conversion || (n_cols > *width))) | |
552 | { | |
553 | if (conversion) | |
554 | { | |
555 | /* May have increased the size by converting | |
556 | \t to \uFFFD for example. */ | |
557 | src_size = wcstombs(NULL, str_wc, 0) + 1; | |
558 | } | |
559 | newstr = malloc (src_size); | |
560 | if (newstr == NULL) | |
561 | { | |
562 | if (flags & MBA_UNIBYTE_FALLBACK) | |
563 | goto mbsalign_unibyte; | |
564 | else | |
565 | goto mbsalign_cleanup; | |
566 | } | |
567 | str_to_print = newstr; | |
568 | n_cols = wc_truncate (str_wc, *width); | |
569 | n_used_bytes = wcstombs (newstr, str_wc, src_size); | |
570 | } | |
104b92f8 PB |
571 | |
572 | mbsalign_unibyte: | |
6426f926 | 573 | #endif |
104b92f8 PB |
574 | |
575 | if (n_cols > *width) /* Unibyte truncation required. */ | |
576 | { | |
577 | n_cols = *width; | |
578 | n_used_bytes = n_cols; | |
579 | } | |
580 | ||
581 | if (*width > n_cols) /* Padding required. */ | |
582 | n_spaces = *width - n_cols; | |
583 | ||
584 | /* indicate to caller how many cells needed (not including padding). */ | |
585 | *width = n_cols; | |
586 | ||
587 | /* indicate to caller how many bytes needed (not including NUL). */ | |
588 | ret = n_used_bytes + (n_spaces * 1); | |
589 | ||
590 | /* Write as much NUL terminated output to DEST as possible. */ | |
591 | if (dest_size != 0) | |
592 | { | |
593 | char *dest_end = dest + dest_size - 1; | |
f7ff0414 SK |
594 | size_t start_spaces; |
595 | size_t end_spaces; | |
104b92f8 PB |
596 | |
597 | switch (align) | |
598 | { | |
599 | case MBS_ALIGN_CENTER: | |
600 | start_spaces = n_spaces / 2 + n_spaces % 2; | |
601 | end_spaces = n_spaces / 2; | |
602 | break; | |
603 | case MBS_ALIGN_LEFT: | |
604 | start_spaces = 0; | |
605 | end_spaces = n_spaces; | |
606 | break; | |
607 | case MBS_ALIGN_RIGHT: | |
608 | start_spaces = n_spaces; | |
609 | end_spaces = 0; | |
610 | break; | |
ce7b11a9 SK |
611 | default: |
612 | abort(); | |
104b92f8 PB |
613 | } |
614 | ||
57867795 | 615 | dest = mbs_align_pad (dest, dest_end, start_spaces, padchar); |
3acc206d | 616 | space_left = dest_end - dest; |
104b92f8 | 617 | dest = mempcpy (dest, str_to_print, min (n_used_bytes, space_left)); |
57867795 | 618 | mbs_align_pad (dest, dest_end, end_spaces, padchar); |
104b92f8 | 619 | } |
6426f926 | 620 | #ifdef HAVE_WIDECHAR |
104b92f8 | 621 | mbsalign_cleanup: |
6426f926 | 622 | #endif |
104b92f8 PB |
623 | free (str_wc); |
624 | free (newstr); | |
625 | ||
626 | return ret; | |
627 | } |