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79feaa60 KZ |
1 | /* |
2 | * SPDX-License-Identifier: LGPL-2.1-or-later | |
3 | * | |
4 | * Align/Truncate a string in a given screen width | |
5 | * Copyright (C) 2009-2010 Free Software Foundation, Inc. | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify it | |
8 | * under the terms of the GNU Lesser General Public License as published by the | |
9 | * Free Software Foundation, either version 2.1 of the License, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | * Written by Pádraig Brady. | |
13 | */ | |
104b92f8 PB |
14 | #include <stdlib.h> |
15 | #include <string.h> | |
16 | #include <stdio.h> | |
17 | #include <stdbool.h> | |
18 | #include <limits.h> | |
1b1f66e4 | 19 | #include <ctype.h> |
104b92f8 PB |
20 | |
21 | #include "c.h" | |
22 | #include "mbsalign.h" | |
ab753d8f | 23 | #include "strutils.h" |
104b92f8 PB |
24 | #include "widechar.h" |
25 | ||
0957fdca KZ |
26 | /* |
27 | * Counts number of cells in multibyte string. All control and | |
28 | * non-printable chars are ignored. | |
29 | * | |
30 | * Returns: number of cells. | |
31 | */ | |
32 | size_t mbs_nwidth(const char *buf, size_t bufsz) | |
33 | { | |
34 | const char *p = buf, *last = buf; | |
35 | size_t width = 0; | |
36 | ||
37 | #ifdef HAVE_WIDECHAR | |
38 | mbstate_t st; | |
39 | memset(&st, 0, sizeof(st)); | |
40 | #endif | |
41 | if (p && *p && bufsz) | |
42 | last = p + (bufsz - 1); | |
43 | ||
44 | while (p && *p && p <= last) { | |
45 | if (iscntrl((unsigned char) *p)) { | |
46 | p++; | |
47 | ||
48 | /* try detect "\e[x;ym" and skip on success */ | |
49 | if (*p && *p == '[') { | |
50 | const char *e = p; | |
51 | while (*e && e < last && *e != 'm') | |
52 | e++; | |
53 | if (*e == 'm') | |
54 | p = e + 1; | |
55 | } | |
56 | continue; | |
57 | } | |
58 | #ifdef HAVE_WIDECHAR | |
59 | wchar_t wc; | |
60 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
61 | ||
62 | if (len == 0) | |
63 | break; | |
64 | if (len > 0 && iswprint(wc)) { | |
65 | int x = wcwidth(wc); | |
66 | if (x > 0) | |
67 | width += x; | |
68 | } else if (len == (size_t) -1 || len == (size_t) -2) | |
69 | len = 1; | |
70 | p += len; | |
71 | #else | |
72 | if (isprint((unsigned char) *p)) | |
73 | width++; | |
74 | p++; | |
75 | #endif | |
76 | } | |
77 | ||
78 | return width; | |
79 | } | |
80 | ||
81 | size_t mbs_width(const char *s) | |
82 | { | |
83 | if (!s || !*s) | |
84 | return 0; | |
85 | return mbs_nwidth(s, strlen(s)); | |
86 | } | |
104b92f8 | 87 | |
1b1f66e4 KZ |
88 | /* |
89 | * Counts number of cells in multibyte string. For all control and | |
90 | * non-printable chars is the result width enlarged to store \x?? hex | |
91 | * sequence. See mbs_safe_encode(). | |
0c33fcbf KZ |
92 | * |
93 | * Returns: number of cells, @sz returns number of bytes. | |
1b1f66e4 | 94 | */ |
0c33fcbf | 95 | size_t mbs_safe_nwidth(const char *buf, size_t bufsz, size_t *sz) |
1b1f66e4 | 96 | { |
0c33fcbf KZ |
97 | const char *p = buf, *last = buf; |
98 | size_t width = 0, bytes = 0; | |
1b1f66e4 | 99 | |
4a423fb9 KZ |
100 | #ifdef HAVE_WIDECHAR |
101 | mbstate_t st; | |
1b1f66e4 | 102 | memset(&st, 0, sizeof(st)); |
4a423fb9 | 103 | #endif |
0c33fcbf KZ |
104 | if (p && *p && bufsz) |
105 | last = p + (bufsz - 1); | |
106 | ||
107 | while (p && *p && p <= last) { | |
43afa845 KZ |
108 | if ((p < last && *p == '\\' && *(p + 1) == 'x') |
109 | || iscntrl((unsigned char) *p)) { | |
0c33fcbf | 110 | width += 4, bytes += 4; /* *p encoded to \x?? */ |
1b1f66e4 KZ |
111 | p++; |
112 | } | |
113 | #ifdef HAVE_WIDECHAR | |
114 | else { | |
115 | wchar_t wc; | |
116 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
117 | ||
118 | if (len == 0) | |
119 | break; | |
120 | ||
121 | if (len == (size_t) -1 || len == (size_t) -2) { | |
122 | len = 1; | |
0c33fcbf KZ |
123 | if (isprint((unsigned char) *p)) |
124 | width += 1, bytes += 1; | |
125 | else | |
126 | width += 4, bytes += 4; | |
1b1f66e4 | 127 | |
0c33fcbf | 128 | } else if (!iswprint(wc)) { |
1b1f66e4 | 129 | width += len * 4; /* hex encode whole sequence */ |
0c33fcbf KZ |
130 | bytes += len * 4; |
131 | } else { | |
1b1f66e4 | 132 | width += wcwidth(wc); /* number of cells */ |
0c33fcbf KZ |
133 | bytes += len; /* number of bytes */ |
134 | } | |
1b1f66e4 KZ |
135 | p += len; |
136 | } | |
137 | #else | |
138 | else if (!isprint((unsigned char) *p)) { | |
0c33fcbf | 139 | width += 4, bytes += 4; /* *p encoded to \x?? */ |
1b1f66e4 KZ |
140 | p++; |
141 | } else { | |
0c33fcbf | 142 | width++, bytes++; |
1b1f66e4 KZ |
143 | p++; |
144 | } | |
145 | #endif | |
146 | } | |
147 | ||
0c33fcbf KZ |
148 | if (sz) |
149 | *sz = bytes; | |
1b1f66e4 KZ |
150 | return width; |
151 | } | |
152 | ||
0c33fcbf KZ |
153 | size_t mbs_safe_width(const char *s) |
154 | { | |
155 | if (!s || !*s) | |
156 | return 0; | |
157 | return mbs_safe_nwidth(s, strlen(s), NULL); | |
158 | } | |
159 | ||
1b1f66e4 | 160 | /* |
c426f70f | 161 | * Copy @s to @buf and replace control and non-printable chars with |
ff471d89 KZ |
162 | * \x?? hex sequence. The @width returns number of cells. The @safechars |
163 | * are not encoded. | |
c426f70f KZ |
164 | * |
165 | * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s))) | |
166 | * bytes. | |
1b1f66e4 | 167 | */ |
ff471d89 | 168 | char *mbs_safe_encode_to_buffer(const char *s, size_t *width, char *buf, const char *safechars) |
1b1f66e4 | 169 | { |
1b1f66e4 | 170 | const char *p = s; |
c426f70f | 171 | char *r; |
1b1f66e4 KZ |
172 | size_t sz = s ? strlen(s) : 0; |
173 | ||
4a423fb9 KZ |
174 | #ifdef HAVE_WIDECHAR |
175 | mbstate_t st; | |
176 | memset(&st, 0, sizeof(st)); | |
177 | #endif | |
c426f70f | 178 | if (!sz || !buf) |
1b1f66e4 KZ |
179 | return NULL; |
180 | ||
c426f70f | 181 | r = buf; |
1b1f66e4 KZ |
182 | *width = 0; |
183 | ||
184 | while (p && *p) { | |
ff471d89 KZ |
185 | if (safechars && strchr(safechars, *p)) { |
186 | *r++ = *p++; | |
187 | continue; | |
188 | } | |
189 | ||
43afa845 KZ |
190 | if ((*p == '\\' && *(p + 1) == 'x') |
191 | || iscntrl((unsigned char) *p)) { | |
1b1f66e4 KZ |
192 | sprintf(r, "\\x%02x", (unsigned char) *p); |
193 | r += 4; | |
194 | *width += 4; | |
195 | p++; | |
196 | } | |
197 | #ifdef HAVE_WIDECHAR | |
198 | else { | |
199 | wchar_t wc; | |
200 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
201 | ||
202 | if (len == 0) | |
203 | break; /* end of string */ | |
204 | ||
205 | if (len == (size_t) -1 || len == (size_t) -2) { | |
206 | len = 1; | |
207 | /* | |
208 | * Not valid multibyte sequence -- maybe it's | |
209 | * printable char according to the current locales. | |
210 | */ | |
211 | if (!isprint((unsigned char) *p)) { | |
212 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
213 | r += 4; | |
214 | *width += 4; | |
215 | } else { | |
4a423fb9 | 216 | (*width)++; |
1b1f66e4 KZ |
217 | *r++ = *p; |
218 | } | |
219 | } else if (!iswprint(wc)) { | |
220 | size_t i; | |
221 | for (i = 0; i < len; i++) { | |
edf86d6b | 222 | sprintf(r, "\\x%02x", (unsigned char) p[i]); |
1b1f66e4 KZ |
223 | r += 4; |
224 | *width += 4; | |
225 | } | |
226 | } else { | |
227 | memcpy(r, p, len); | |
228 | r += len; | |
229 | *width += wcwidth(wc); | |
230 | } | |
231 | p += len; | |
232 | } | |
233 | #else | |
234 | else if (!isprint((unsigned char) *p)) { | |
235 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
236 | p++; | |
237 | r += 4; | |
238 | *width += 4; | |
239 | } else { | |
240 | *r++ = *p++; | |
4a423fb9 | 241 | (*width)++; |
1b1f66e4 KZ |
242 | } |
243 | #endif | |
244 | } | |
245 | ||
246 | *r = '\0'; | |
c426f70f KZ |
247 | return buf; |
248 | } | |
249 | ||
365ed9f6 KZ |
250 | /* |
251 | * Copy @s to @buf and replace broken sequences to \x?? hex sequence. The | |
252 | * @width returns number of cells. The @safechars are not encoded. | |
253 | * | |
254 | * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s))) | |
255 | * bytes. | |
256 | */ | |
257 | char *mbs_invalid_encode_to_buffer(const char *s, size_t *width, char *buf) | |
258 | { | |
259 | const char *p = s; | |
260 | char *r; | |
261 | size_t sz = s ? strlen(s) : 0; | |
262 | ||
263 | #ifdef HAVE_WIDECHAR | |
264 | mbstate_t st; | |
265 | memset(&st, 0, sizeof(st)); | |
266 | #endif | |
267 | if (!sz || !buf) | |
268 | return NULL; | |
269 | ||
270 | r = buf; | |
271 | *width = 0; | |
272 | ||
273 | while (p && *p) { | |
274 | #ifdef HAVE_WIDECHAR | |
275 | wchar_t wc; | |
276 | size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); | |
2ba65f37 VD |
277 | #else |
278 | size_t len = 1; | |
279 | #endif | |
365ed9f6 KZ |
280 | |
281 | if (len == 0) | |
282 | break; /* end of string */ | |
283 | ||
284 | if (len == (size_t) -1 || len == (size_t) -2) { | |
285 | len = 1; | |
286 | /* | |
287 | * Not valid multibyte sequence -- maybe it's | |
288 | * printable char according to the current locales. | |
289 | */ | |
290 | if (!isprint((unsigned char) *p)) { | |
291 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
292 | r += 4; | |
293 | *width += 4; | |
294 | } else { | |
295 | (*width)++; | |
296 | *r++ = *p; | |
297 | } | |
43afa845 KZ |
298 | } else if (*p == '\\' && *(p + 1) == 'x') { |
299 | sprintf(r, "\\x%02x", (unsigned char) *p); | |
300 | r += 4; | |
301 | *width += 4; | |
365ed9f6 | 302 | } else { |
cba33452 | 303 | r = mempcpy(r, p, len); |
365ed9f6 KZ |
304 | *width += wcwidth(wc); |
305 | } | |
306 | p += len; | |
365ed9f6 KZ |
307 | } |
308 | ||
309 | *r = '\0'; | |
310 | return buf; | |
311 | } | |
312 | ||
6b724741 KZ |
313 | /* |
314 | * Guess size | |
315 | */ | |
c426f70f KZ |
316 | size_t mbs_safe_encode_size(size_t bytes) |
317 | { | |
318 | return (bytes * 4) + 1; | |
319 | } | |
320 | ||
6b724741 KZ |
321 | /* |
322 | * Count size of the original string in bytes (count \x?? as one byte) | |
323 | */ | |
324 | size_t mbs_safe_decode_size(const char *p) | |
325 | { | |
326 | size_t bytes = 0; | |
327 | ||
328 | while (p && *p) { | |
329 | if (*p == '\\' && *(p + 1) == 'x' && | |
330 | isxdigit(*(p + 2)) && isxdigit(*(p + 3))) | |
331 | p += 4; | |
332 | else | |
333 | p++; | |
334 | bytes++; | |
335 | } | |
336 | return bytes; | |
337 | } | |
338 | ||
c426f70f KZ |
339 | /* |
340 | * Returns allocated string where all control and non-printable chars are | |
341 | * replaced with \x?? hex sequence. | |
342 | */ | |
343 | char *mbs_safe_encode(const char *s, size_t *width) | |
344 | { | |
345 | size_t sz = s ? strlen(s) : 0; | |
f4d37838 | 346 | char *buf, *ret = NULL; |
c426f70f KZ |
347 | |
348 | if (!sz) | |
349 | return NULL; | |
350 | buf = malloc(mbs_safe_encode_size(sz)); | |
a86b9f25 KZ |
351 | if (buf) |
352 | ret = mbs_safe_encode_to_buffer(s, width, buf, NULL); | |
353 | if (!ret) | |
354 | free(buf); | |
355 | return ret; | |
1b1f66e4 KZ |
356 | } |
357 | ||
365ed9f6 KZ |
358 | /* |
359 | * Returns allocated string where all broken widechars chars are | |
360 | * replaced with \x?? hex sequence. | |
361 | */ | |
362 | char *mbs_invalid_encode(const char *s, size_t *width) | |
363 | { | |
364 | size_t sz = s ? strlen(s) : 0; | |
365 | char *buf, *ret = NULL; | |
366 | ||
367 | if (!sz) | |
368 | return NULL; | |
369 | buf = malloc(mbs_safe_encode_size(sz)); | |
370 | if (buf) | |
371 | ret = mbs_invalid_encode_to_buffer(s, width, buf); | |
372 | if (!ret) | |
373 | free(buf); | |
374 | return ret; | |
375 | } | |
376 | ||
4a423fb9 KZ |
377 | #ifdef HAVE_WIDECHAR |
378 | ||
104b92f8 PB |
379 | static bool |
380 | wc_ensure_printable (wchar_t *wchars) | |
381 | { | |
382 | bool replaced = false; | |
383 | wchar_t *wc = wchars; | |
384 | while (*wc) | |
385 | { | |
386 | if (!iswprint ((wint_t) *wc)) | |
387 | { | |
388 | *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */ | |
389 | replaced = true; | |
390 | } | |
391 | wc++; | |
392 | } | |
393 | return replaced; | |
394 | } | |
395 | ||
396 | /* Truncate wchar string to width cells. | |
397 | * Returns number of cells used. */ | |
398 | ||
399 | static size_t | |
400 | wc_truncate (wchar_t *wc, size_t width) | |
401 | { | |
402 | size_t cells = 0; | |
403 | int next_cells = 0; | |
404 | ||
405 | while (*wc) | |
406 | { | |
407 | next_cells = wcwidth (*wc); | |
408 | if (next_cells == -1) /* non printable */ | |
409 | { | |
410 | *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */ | |
411 | next_cells = 1; | |
412 | } | |
413 | if (cells + next_cells > width) | |
414 | break; | |
d94c5198 | 415 | |
104b92f8 PB |
416 | cells += next_cells; |
417 | wc++; | |
418 | } | |
419 | *wc = L'\0'; | |
420 | return cells; | |
421 | } | |
422 | ||
104b92f8 PB |
423 | static int |
424 | rpl_wcswidth (const wchar_t *s, size_t n) | |
425 | { | |
426 | int ret = 0; | |
427 | ||
428 | while (n-- > 0 && *s != L'\0') | |
429 | { | |
430 | int nwidth = wcwidth (*s++); | |
431 | if (nwidth == -1) /* non printable */ | |
432 | return -1; | |
433 | if (ret > (INT_MAX - nwidth)) /* overflow */ | |
434 | return -1; | |
435 | ret += nwidth; | |
436 | } | |
437 | ||
438 | return ret; | |
439 | } | |
4a423fb9 | 440 | #endif /* HAVE_WIDECHAR */ |
104b92f8 | 441 | |
5f94ca33 KZ |
442 | /* Truncate multi-byte string to @width and returns number of |
443 | * bytes of the new string @str, and in @width returns number | |
444 | * of cells. | |
445 | */ | |
446 | size_t | |
447 | mbs_truncate(char *str, size_t *width) | |
448 | { | |
2897f29a | 449 | ssize_t bytes = strlen(str); |
5f94ca33 | 450 | #ifdef HAVE_WIDECHAR |
2897f29a | 451 | ssize_t sz = mbstowcs(NULL, str, 0); |
5f94ca33 KZ |
452 | wchar_t *wcs = NULL; |
453 | ||
2897f29a | 454 | if (sz == (ssize_t) -1) |
5f94ca33 KZ |
455 | goto done; |
456 | ||
d94c5198 | 457 | wcs = calloc(1, (sz + 1) * sizeof(wchar_t)); |
5f94ca33 KZ |
458 | if (!wcs) |
459 | goto done; | |
460 | ||
461 | if (!mbstowcs(wcs, str, sz)) | |
462 | goto done; | |
463 | *width = wc_truncate(wcs, *width); | |
464 | bytes = wcstombs(str, wcs, bytes); | |
465 | done: | |
466 | free(wcs); | |
467 | #else | |
6426f926 | 468 | if (bytes >= 0 && *width < (size_t) bytes) |
5f94ca33 KZ |
469 | bytes = *width; |
470 | #endif | |
471 | if (bytes >= 0) | |
472 | str[bytes] = '\0'; | |
473 | return bytes; | |
474 | } | |
475 | ||
104b92f8 PB |
476 | /* Write N_SPACES space characters to DEST while ensuring |
477 | nothing is written beyond DEST_END. A terminating NUL | |
478 | is always added to DEST. | |
479 | A pointer to the terminating NUL is returned. */ | |
480 | ||
481 | static char* | |
57867795 | 482 | mbs_align_pad (char *dest, const char* dest_end, size_t n_spaces, int padchar) |
104b92f8 | 483 | { |
efb2fe5f | 484 | for (/* nothing */; n_spaces && (dest < dest_end); n_spaces--) |
57867795 | 485 | *dest++ = padchar; |
104b92f8 PB |
486 | *dest = '\0'; |
487 | return dest; | |
488 | } | |
489 | ||
57867795 KZ |
490 | size_t |
491 | mbsalign (const char *src, char *dest, size_t dest_size, | |
492 | size_t *width, mbs_align_t align, int flags) | |
493 | { | |
494 | return mbsalign_with_padding(src, dest, dest_size, width, align, flags, ' '); | |
495 | } | |
496 | ||
104b92f8 PB |
497 | /* Align a string, SRC, in a field of *WIDTH columns, handling multi-byte |
498 | characters; write the result into the DEST_SIZE-byte buffer, DEST. | |
499 | ALIGNMENT specifies whether to left- or right-justify or to center. | |
500 | If SRC requires more than *WIDTH columns, truncate it to fit. | |
501 | When centering, the number of trailing spaces may be one less than the | |
502 | number of leading spaces. The FLAGS parameter is unused at present. | |
503 | Return the length in bytes required for the final result, not counting | |
504 | the trailing NUL. A return value of DEST_SIZE or larger means there | |
505 | wasn't enough space. DEST will be NUL terminated in any case. | |
506 | Return (size_t) -1 upon error (invalid multi-byte sequence in SRC, | |
507 | or malloc failure), unless MBA_UNIBYTE_FALLBACK is specified. | |
508 | Update *WIDTH to indicate how many columns were used before padding. */ | |
509 | ||
510 | size_t | |
57867795 | 511 | mbsalign_with_padding (const char *src, char *dest, size_t dest_size, |
c191740c KZ |
512 | size_t *width, mbs_align_t align, |
513 | #ifdef HAVE_WIDECHAR | |
514 | int flags, | |
515 | #else | |
516 | int flags __attribute__((__unused__)), | |
517 | #endif | |
57867795 | 518 | int padchar) |
104b92f8 PB |
519 | { |
520 | size_t ret = -1; | |
521 | size_t src_size = strlen (src) + 1; | |
522 | char *newstr = NULL; | |
523 | wchar_t *str_wc = NULL; | |
524 | const char *str_to_print = src; | |
525 | size_t n_cols = src_size - 1; | |
526 | size_t n_used_bytes = n_cols; /* Not including NUL */ | |
3acc206d | 527 | size_t n_spaces = 0, space_left; |
6426f926 KZ |
528 | |
529 | #ifdef HAVE_WIDECHAR | |
104b92f8 PB |
530 | bool conversion = false; |
531 | bool wc_enabled = false; | |
532 | ||
104b92f8 PB |
533 | /* In multi-byte locales convert to wide characters |
534 | to allow easy truncation. Also determine number | |
535 | of screen columns used. */ | |
536 | if (MB_CUR_MAX > 1) | |
537 | { | |
538 | size_t src_chars = mbstowcs (NULL, src, 0); | |
539 | if (src_chars == (size_t) -1) | |
540 | { | |
541 | if (flags & MBA_UNIBYTE_FALLBACK) | |
542 | goto mbsalign_unibyte; | |
543 | else | |
544 | goto mbsalign_cleanup; | |
545 | } | |
546 | src_chars += 1; /* make space for NUL */ | |
547 | str_wc = malloc (src_chars * sizeof (wchar_t)); | |
548 | if (str_wc == NULL) | |
549 | { | |
550 | if (flags & MBA_UNIBYTE_FALLBACK) | |
551 | goto mbsalign_unibyte; | |
552 | else | |
553 | goto mbsalign_cleanup; | |
554 | } | |
555 | if (mbstowcs (str_wc, src, src_chars) != 0) | |
556 | { | |
557 | str_wc[src_chars - 1] = L'\0'; | |
558 | wc_enabled = true; | |
559 | conversion = wc_ensure_printable (str_wc); | |
560 | n_cols = rpl_wcswidth (str_wc, src_chars); | |
561 | } | |
562 | } | |
563 | ||
564 | /* If we transformed or need to truncate the source string | |
565 | then create a modified copy of it. */ | |
566 | if (wc_enabled && (conversion || (n_cols > *width))) | |
567 | { | |
568 | if (conversion) | |
569 | { | |
570 | /* May have increased the size by converting | |
571 | \t to \uFFFD for example. */ | |
572 | src_size = wcstombs(NULL, str_wc, 0) + 1; | |
573 | } | |
574 | newstr = malloc (src_size); | |
575 | if (newstr == NULL) | |
576 | { | |
577 | if (flags & MBA_UNIBYTE_FALLBACK) | |
578 | goto mbsalign_unibyte; | |
579 | else | |
580 | goto mbsalign_cleanup; | |
581 | } | |
582 | str_to_print = newstr; | |
583 | n_cols = wc_truncate (str_wc, *width); | |
584 | n_used_bytes = wcstombs (newstr, str_wc, src_size); | |
585 | } | |
104b92f8 PB |
586 | |
587 | mbsalign_unibyte: | |
6426f926 | 588 | #endif |
104b92f8 PB |
589 | |
590 | if (n_cols > *width) /* Unibyte truncation required. */ | |
591 | { | |
592 | n_cols = *width; | |
593 | n_used_bytes = n_cols; | |
594 | } | |
595 | ||
596 | if (*width > n_cols) /* Padding required. */ | |
597 | n_spaces = *width - n_cols; | |
598 | ||
599 | /* indicate to caller how many cells needed (not including padding). */ | |
600 | *width = n_cols; | |
601 | ||
602 | /* indicate to caller how many bytes needed (not including NUL). */ | |
603 | ret = n_used_bytes + (n_spaces * 1); | |
604 | ||
605 | /* Write as much NUL terminated output to DEST as possible. */ | |
606 | if (dest_size != 0) | |
607 | { | |
608 | char *dest_end = dest + dest_size - 1; | |
f7ff0414 SK |
609 | size_t start_spaces; |
610 | size_t end_spaces; | |
104b92f8 PB |
611 | |
612 | switch (align) | |
613 | { | |
614 | case MBS_ALIGN_CENTER: | |
615 | start_spaces = n_spaces / 2 + n_spaces % 2; | |
616 | end_spaces = n_spaces / 2; | |
617 | break; | |
618 | case MBS_ALIGN_LEFT: | |
619 | start_spaces = 0; | |
620 | end_spaces = n_spaces; | |
621 | break; | |
622 | case MBS_ALIGN_RIGHT: | |
623 | start_spaces = n_spaces; | |
624 | end_spaces = 0; | |
625 | break; | |
ce7b11a9 SK |
626 | default: |
627 | abort(); | |
104b92f8 PB |
628 | } |
629 | ||
57867795 | 630 | dest = mbs_align_pad (dest, dest_end, start_spaces, padchar); |
3acc206d | 631 | space_left = dest_end - dest; |
104b92f8 | 632 | dest = mempcpy (dest, str_to_print, min (n_used_bytes, space_left)); |
57867795 | 633 | mbs_align_pad (dest, dest_end, end_spaces, padchar); |
104b92f8 | 634 | } |
6426f926 | 635 | #ifdef HAVE_WIDECHAR |
104b92f8 | 636 | mbsalign_cleanup: |
6426f926 | 637 | #endif |
104b92f8 PB |
638 | free (str_wc); |
639 | free (newstr); | |
640 | ||
641 | return ret; | |
642 | } |