Merge branch 'ak/typofixes'
[git/gitster.git] / utf8.c
blob6bfaefa28ebbbfd145b30b58fe0e937ea921ec91
1 #include "git-compat-util.h"
2 #include "strbuf.h"
3 #include "utf8.h"
5 /* This code is originally from https://www.cl.cam.ac.uk/~mgk25/ucs/ */
7 static const char utf16_be_bom[] = {'\xFE', '\xFF'};
8 static const char utf16_le_bom[] = {'\xFF', '\xFE'};
9 static const char utf32_be_bom[] = {'\0', '\0', '\xFE', '\xFF'};
10 static const char utf32_le_bom[] = {'\xFF', '\xFE', '\0', '\0'};
12 struct interval {
13 ucs_char_t first;
14 ucs_char_t last;
17 size_t display_mode_esc_sequence_len(const char *s)
19 const char *p = s;
20 if (*p++ != '\033')
21 return 0;
22 if (*p++ != '[')
23 return 0;
24 while (isdigit(*p) || *p == ';')
25 p++;
26 if (*p++ != 'm')
27 return 0;
28 return p - s;
31 /* auxiliary function for binary search in interval table */
32 static int bisearch(ucs_char_t ucs, const struct interval *table, int max)
34 int min = 0;
35 int mid;
37 if (ucs < table[0].first || ucs > table[max].last)
38 return 0;
39 while (max >= min) {
40 mid = min + (max - min) / 2;
41 if (ucs > table[mid].last)
42 min = mid + 1;
43 else if (ucs < table[mid].first)
44 max = mid - 1;
45 else
46 return 1;
49 return 0;
52 /* The following two functions define the column width of an ISO 10646
53 * character as follows:
55 * - The null character (U+0000) has a column width of 0.
57 * - Other C0/C1 control characters and DEL will lead to a return
58 * value of -1.
60 * - Non-spacing and enclosing combining characters (general
61 * category code Mn or Me in the Unicode database) have a
62 * column width of 0.
64 * - SOFT HYPHEN (U+00AD) has a column width of 1.
66 * - Other format characters (general category code Cf in the Unicode
67 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
69 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
70 * have a column width of 0.
72 * - Spacing characters in the East Asian Wide (W) or East Asian
73 * Full-width (F) category as defined in Unicode Technical
74 * Report #11 have a column width of 2.
76 * - All remaining characters (including all printable
77 * ISO 8859-1 and WGL4 characters, Unicode control characters,
78 * etc.) have a column width of 1.
80 * This implementation assumes that ucs_char_t characters are encoded
81 * in ISO 10646.
84 static int git_wcwidth(ucs_char_t ch)
87 * Sorted list of non-overlapping intervals of non-spacing characters,
89 #include "unicode-width.h"
91 /* test for 8-bit control characters */
92 if (ch == 0)
93 return 0;
94 if (ch < 32 || (ch >= 0x7f && ch < 0xa0))
95 return -1;
97 /* binary search in table of non-spacing characters */
98 if (bisearch(ch, zero_width, ARRAY_SIZE(zero_width) - 1))
99 return 0;
101 /* binary search in table of double width characters */
102 if (bisearch(ch, double_width, ARRAY_SIZE(double_width) - 1))
103 return 2;
105 return 1;
109 * Pick one ucs character starting from the location *start points at,
110 * and return it, while updating the *start pointer to point at the
111 * end of that character. When remainder_p is not NULL, the location
112 * holds the number of bytes remaining in the string that we are allowed
113 * to pick from. Otherwise we are allowed to pick up to the NUL that
114 * would eventually appear in the string. *remainder_p is also reduced
115 * by the number of bytes we have consumed.
117 * If the string was not a valid UTF-8, *start pointer is set to NULL
118 * and the return value is undefined.
120 static ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p)
122 unsigned char *s = (unsigned char *)*start;
123 ucs_char_t ch;
124 size_t remainder, incr;
127 * A caller that assumes NUL terminated text can choose
128 * not to bother with the remainder length. We will
129 * stop at the first NUL.
131 remainder = (remainder_p ? *remainder_p : 999);
133 if (remainder < 1) {
134 goto invalid;
135 } else if (*s < 0x80) {
136 /* 0xxxxxxx */
137 ch = *s;
138 incr = 1;
139 } else if ((s[0] & 0xe0) == 0xc0) {
140 /* 110XXXXx 10xxxxxx */
141 if (remainder < 2 ||
142 (s[1] & 0xc0) != 0x80 ||
143 (s[0] & 0xfe) == 0xc0)
144 goto invalid;
145 ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
146 incr = 2;
147 } else if ((s[0] & 0xf0) == 0xe0) {
148 /* 1110XXXX 10Xxxxxx 10xxxxxx */
149 if (remainder < 3 ||
150 (s[1] & 0xc0) != 0x80 ||
151 (s[2] & 0xc0) != 0x80 ||
152 /* overlong? */
153 (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) ||
154 /* surrogate? */
155 (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) ||
156 /* U+FFFE or U+FFFF? */
157 (s[0] == 0xef && s[1] == 0xbf &&
158 (s[2] & 0xfe) == 0xbe))
159 goto invalid;
160 ch = ((s[0] & 0x0f) << 12) |
161 ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
162 incr = 3;
163 } else if ((s[0] & 0xf8) == 0xf0) {
164 /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
165 if (remainder < 4 ||
166 (s[1] & 0xc0) != 0x80 ||
167 (s[2] & 0xc0) != 0x80 ||
168 (s[3] & 0xc0) != 0x80 ||
169 /* overlong? */
170 (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) ||
171 /* > U+10FFFF? */
172 (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4)
173 goto invalid;
174 ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) |
175 ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
176 incr = 4;
177 } else {
178 invalid:
179 *start = NULL;
180 return 0;
183 *start += incr;
184 if (remainder_p)
185 *remainder_p = remainder - incr;
186 return ch;
190 * This function returns the number of columns occupied by the character
191 * pointed to by the variable start. The pointer is updated to point at
192 * the next character. When remainder_p is not NULL, it points at the
193 * location that stores the number of remaining bytes we can use to pick
194 * a character (see pick_one_utf8_char() above).
196 int utf8_width(const char **start, size_t *remainder_p)
198 ucs_char_t ch = pick_one_utf8_char(start, remainder_p);
199 if (!*start)
200 return 0;
201 return git_wcwidth(ch);
205 * Returns the total number of columns required by a null-terminated
206 * string, assuming that the string is utf8. Returns strlen() instead
207 * if the string does not look like a valid utf8 string.
209 int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
211 const char *orig = string;
212 size_t width = 0;
214 while (string && string < orig + len) {
215 int glyph_width;
216 size_t skip;
218 while (skip_ansi &&
219 (skip = display_mode_esc_sequence_len(string)) != 0)
220 string += skip;
222 glyph_width = utf8_width(&string, NULL);
223 if (glyph_width > 0)
224 width += glyph_width;
228 * TODO: fix the interface of this function and `utf8_strwidth()` to
229 * return `size_t` instead of `int`.
231 return cast_size_t_to_int(string ? width : len);
234 int utf8_strwidth(const char *string)
236 return utf8_strnwidth(string, strlen(string), 0);
239 int is_utf8(const char *text)
241 while (*text) {
242 if (*text == '\n' || *text == '\t' || *text == '\r') {
243 text++;
244 continue;
246 utf8_width(&text, NULL);
247 if (!text)
248 return 0;
250 return 1;
253 static void strbuf_add_indented_text(struct strbuf *buf, const char *text,
254 int indent, int indent2)
256 if (indent < 0)
257 indent = 0;
258 while (*text) {
259 const char *eol = strchrnul(text, '\n');
260 if (*eol == '\n')
261 eol++;
262 strbuf_addchars(buf, ' ', indent);
263 strbuf_add(buf, text, eol - text);
264 text = eol;
265 indent = indent2;
270 * Wrap the text, if necessary. The variable indent is the indent for the
271 * first line, indent2 is the indent for all other lines.
272 * If indent is negative, assume that already -indent columns have been
273 * consumed (and no extra indent is necessary for the first line).
275 void strbuf_add_wrapped_text(struct strbuf *buf,
276 const char *text, int indent1, int indent2, int width)
278 int indent, w, assume_utf8 = 1;
279 const char *bol, *space, *start = text;
280 size_t orig_len = buf->len;
282 if (width <= 0) {
283 strbuf_add_indented_text(buf, text, indent1, indent2);
284 return;
287 retry:
288 bol = text;
289 w = indent = indent1;
290 space = NULL;
291 if (indent < 0) {
292 w = -indent;
293 space = text;
296 for (;;) {
297 char c;
298 size_t skip;
300 while ((skip = display_mode_esc_sequence_len(text)))
301 text += skip;
303 c = *text;
304 if (!c || isspace(c)) {
305 if (w <= width || !space) {
306 const char *start = bol;
307 if (!c && text == start)
308 return;
309 if (space)
310 start = space;
311 else
312 strbuf_addchars(buf, ' ', indent);
313 strbuf_add(buf, start, text - start);
314 if (!c)
315 return;
316 space = text;
317 if (c == '\t')
318 w |= 0x07;
319 else if (c == '\n') {
320 space++;
321 if (*space == '\n') {
322 strbuf_addch(buf, '\n');
323 goto new_line;
325 else if (!isalnum(*space))
326 goto new_line;
327 else
328 strbuf_addch(buf, ' ');
330 w++;
331 text++;
333 else {
334 new_line:
335 strbuf_addch(buf, '\n');
336 text = bol = space + isspace(*space);
337 space = NULL;
338 w = indent = indent2;
340 continue;
342 if (assume_utf8) {
343 w += utf8_width(&text, NULL);
344 if (!text) {
345 assume_utf8 = 0;
346 text = start;
347 strbuf_setlen(buf, orig_len);
348 goto retry;
350 } else {
351 w++;
352 text++;
357 void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len,
358 int indent, int indent2, int width)
360 char *tmp = xstrndup(data, len);
361 strbuf_add_wrapped_text(buf, tmp, indent, indent2, width);
362 free(tmp);
365 void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
366 const char *subst)
368 const char *src = sb_src->buf, *end = sb_src->buf + sb_src->len;
369 struct strbuf dst;
370 int w = 0;
372 strbuf_init(&dst, sb_src->len);
374 while (src < end) {
375 const char *old;
376 int glyph_width;
377 size_t n;
379 while ((n = display_mode_esc_sequence_len(src))) {
380 strbuf_add(&dst, src, n);
381 src += n;
384 if (src >= end)
385 break;
387 old = src;
388 glyph_width = utf8_width((const char**)&src, NULL);
389 if (!src) /* broken utf-8, do nothing */
390 goto out;
393 * In case we see a control character we copy it into the
394 * buffer, but don't add it to the width.
396 if (glyph_width < 0)
397 glyph_width = 0;
399 if (glyph_width && w >= pos && w < pos + width) {
400 if (subst) {
401 strbuf_addstr(&dst, subst);
402 subst = NULL;
404 } else {
405 strbuf_add(&dst, old, src - old);
408 w += glyph_width;
411 strbuf_swap(sb_src, &dst);
412 out:
413 strbuf_release(&dst);
417 * Returns true (1) if the src encoding name matches the dst encoding
418 * name directly or one of its alternative names. E.g. UTF-16BE is the
419 * same as UTF16BE.
421 static int same_utf_encoding(const char *src, const char *dst)
423 if (skip_iprefix(src, "utf", &src) && skip_iprefix(dst, "utf", &dst)) {
424 skip_prefix(src, "-", &src);
425 skip_prefix(dst, "-", &dst);
426 return !strcasecmp(src, dst);
428 return 0;
431 int is_encoding_utf8(const char *name)
433 if (!name)
434 return 1;
435 if (same_utf_encoding("utf-8", name))
436 return 1;
437 return 0;
440 int same_encoding(const char *src, const char *dst)
442 static const char utf8[] = "UTF-8";
444 if (!src)
445 src = utf8;
446 if (!dst)
447 dst = utf8;
448 if (same_utf_encoding(src, dst))
449 return 1;
450 return !strcasecmp(src, dst);
454 * Wrapper for fprintf and returns the total number of columns required
455 * for the printed string, assuming that the string is utf8.
457 int utf8_fprintf(FILE *stream, const char *format, ...)
459 struct strbuf buf = STRBUF_INIT;
460 va_list arg;
461 int columns;
463 va_start(arg, format);
464 strbuf_vaddf(&buf, format, arg);
465 va_end(arg);
467 columns = fputs(buf.buf, stream);
468 if (0 <= columns) /* keep the error from the I/O */
469 columns = utf8_strwidth(buf.buf);
470 strbuf_release(&buf);
471 return columns;
475 * Given a buffer and its encoding, return it re-encoded
476 * with iconv. If the conversion fails, returns NULL.
478 #ifndef NO_ICONV
479 #if defined(OLD_ICONV) || (defined(__sun__) && !defined(_XPG6))
480 typedef const char * iconv_ibp;
481 #else
482 typedef char * iconv_ibp;
483 #endif
484 char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv,
485 size_t bom_len, size_t *outsz_p)
487 size_t outsz, outalloc;
488 char *out, *outpos;
489 iconv_ibp cp;
491 outsz = insz;
492 outalloc = st_add(outsz, 1 + bom_len); /* for terminating NUL */
493 out = xmalloc(outalloc);
494 outpos = out + bom_len;
495 cp = (iconv_ibp)in;
497 while (1) {
498 size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz);
500 if (cnt == (size_t) -1) {
501 size_t sofar;
502 if (errno != E2BIG) {
503 free(out);
504 return NULL;
506 /* insz has remaining number of bytes.
507 * since we started outsz the same as insz,
508 * it is likely that insz is not enough for
509 * converting the rest.
511 sofar = outpos - out;
512 outalloc = st_add3(sofar, st_mult(insz, 2), 32);
513 out = xrealloc(out, outalloc);
514 outpos = out + sofar;
515 outsz = outalloc - sofar - 1;
517 else {
518 *outpos = '\0';
519 if (outsz_p)
520 *outsz_p = outpos - out;
521 break;
524 return out;
527 static const char *fallback_encoding(const char *name)
530 * Some platforms do not have the variously spelled variants of
531 * UTF-8, so let's fall back to trying the most official
532 * spelling. We do so only as a fallback in case the platform
533 * does understand the user's spelling, but not our official
534 * one.
536 if (is_encoding_utf8(name))
537 return "UTF-8";
540 * Even though latin-1 is still seen in e-mail
541 * headers, some platforms only install ISO-8859-1.
543 if (!strcasecmp(name, "latin-1"))
544 return "ISO-8859-1";
546 return name;
549 char *reencode_string_len(const char *in, size_t insz,
550 const char *out_encoding, const char *in_encoding,
551 size_t *outsz)
553 iconv_t conv;
554 char *out;
555 const char *bom_str = NULL;
556 size_t bom_len = 0;
558 if (!in_encoding)
559 return NULL;
561 /* UTF-16LE-BOM is the same as UTF-16 for reading */
562 if (same_utf_encoding("UTF-16LE-BOM", in_encoding))
563 in_encoding = "UTF-16";
566 * For writing, UTF-16 iconv typically creates "UTF-16BE-BOM"
567 * Some users under Windows want the little endian version
569 * We handle UTF-16 and UTF-32 ourselves only if the platform does not
570 * provide a BOM (which we require), since we want to match the behavior
571 * of the system tools and libc as much as possible.
573 if (same_utf_encoding("UTF-16LE-BOM", out_encoding)) {
574 bom_str = utf16_le_bom;
575 bom_len = sizeof(utf16_le_bom);
576 out_encoding = "UTF-16LE";
577 } else if (same_utf_encoding("UTF-16BE-BOM", out_encoding)) {
578 bom_str = utf16_be_bom;
579 bom_len = sizeof(utf16_be_bom);
580 out_encoding = "UTF-16BE";
581 #ifdef ICONV_OMITS_BOM
582 } else if (same_utf_encoding("UTF-16", out_encoding)) {
583 bom_str = utf16_be_bom;
584 bom_len = sizeof(utf16_be_bom);
585 out_encoding = "UTF-16BE";
586 } else if (same_utf_encoding("UTF-32", out_encoding)) {
587 bom_str = utf32_be_bom;
588 bom_len = sizeof(utf32_be_bom);
589 out_encoding = "UTF-32BE";
590 #endif
593 conv = iconv_open(out_encoding, in_encoding);
594 if (conv == (iconv_t) -1) {
595 in_encoding = fallback_encoding(in_encoding);
596 out_encoding = fallback_encoding(out_encoding);
598 conv = iconv_open(out_encoding, in_encoding);
599 if (conv == (iconv_t) -1)
600 return NULL;
602 out = reencode_string_iconv(in, insz, conv, bom_len, outsz);
603 iconv_close(conv);
604 if (out && bom_str && bom_len)
605 memcpy(out, bom_str, bom_len);
606 return out;
608 #endif
610 static int has_bom_prefix(const char *data, size_t len,
611 const char *bom, size_t bom_len)
613 return data && bom && (len >= bom_len) && !memcmp(data, bom, bom_len);
616 int has_prohibited_utf_bom(const char *enc, const char *data, size_t len)
618 return (
619 (same_utf_encoding("UTF-16BE", enc) ||
620 same_utf_encoding("UTF-16LE", enc)) &&
621 (has_bom_prefix(data, len, utf16_be_bom, sizeof(utf16_be_bom)) ||
622 has_bom_prefix(data, len, utf16_le_bom, sizeof(utf16_le_bom)))
623 ) || (
624 (same_utf_encoding("UTF-32BE", enc) ||
625 same_utf_encoding("UTF-32LE", enc)) &&
626 (has_bom_prefix(data, len, utf32_be_bom, sizeof(utf32_be_bom)) ||
627 has_bom_prefix(data, len, utf32_le_bom, sizeof(utf32_le_bom)))
631 int is_missing_required_utf_bom(const char *enc, const char *data, size_t len)
633 return (
634 (same_utf_encoding(enc, "UTF-16")) &&
635 !(has_bom_prefix(data, len, utf16_be_bom, sizeof(utf16_be_bom)) ||
636 has_bom_prefix(data, len, utf16_le_bom, sizeof(utf16_le_bom)))
637 ) || (
638 (same_utf_encoding(enc, "UTF-32")) &&
639 !(has_bom_prefix(data, len, utf32_be_bom, sizeof(utf32_be_bom)) ||
640 has_bom_prefix(data, len, utf32_le_bom, sizeof(utf32_le_bom)))
645 * Returns first character length in bytes for multi-byte `text` according to
646 * `encoding`.
648 * - The `text` pointer is updated to point at the next character.
649 * - When `remainder_p` is not NULL, on entry `*remainder_p` is how much bytes
650 * we can consume from text, and on exit `*remainder_p` is reduced by returned
651 * character length. Otherwise `text` is treated as limited by NUL.
653 int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding)
655 int chrlen;
656 const char *p = *text;
657 size_t r = (remainder_p ? *remainder_p : SIZE_MAX);
659 if (r < 1)
660 return 0;
662 if (is_encoding_utf8(encoding)) {
663 pick_one_utf8_char(&p, &r);
665 chrlen = p ? (p - *text)
666 : 1 /* not valid UTF-8 -> raw byte sequence */;
668 else {
670 * TODO use iconv to decode one char and obtain its chrlen
671 * for now, let's treat encodings != UTF-8 as one-byte
673 chrlen = 1;
676 *text += chrlen;
677 if (remainder_p)
678 *remainder_p -= chrlen;
680 return chrlen;
684 * Pick the next char from the stream, ignoring codepoints an HFS+ would.
685 * Note that this is _not_ complete by any means. It's just enough
686 * to make is_hfs_dotgit() work, and should not be used otherwise.
688 static ucs_char_t next_hfs_char(const char **in)
690 while (1) {
691 ucs_char_t out = pick_one_utf8_char(in, NULL);
693 * check for malformed utf8. Technically this
694 * gets converted to a percent-sequence, but
695 * returning 0 is good enough for is_hfs_dotgit
696 * to realize it cannot be .git
698 if (!*in)
699 return 0;
701 /* these code points are ignored completely */
702 switch (out) {
703 case 0x200c: /* ZERO WIDTH NON-JOINER */
704 case 0x200d: /* ZERO WIDTH JOINER */
705 case 0x200e: /* LEFT-TO-RIGHT MARK */
706 case 0x200f: /* RIGHT-TO-LEFT MARK */
707 case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */
708 case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */
709 case 0x202c: /* POP DIRECTIONAL FORMATTING */
710 case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */
711 case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */
712 case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */
713 case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */
714 case 0x206c: /* INHIBIT ARABIC FORM SHAPING */
715 case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */
716 case 0x206e: /* NATIONAL DIGIT SHAPES */
717 case 0x206f: /* NOMINAL DIGIT SHAPES */
718 case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */
719 continue;
722 return out;
726 static int is_hfs_dot_generic(const char *path,
727 const char *needle, size_t needle_len)
729 ucs_char_t c;
731 c = next_hfs_char(&path);
732 if (c != '.')
733 return 0;
736 * there's a great deal of other case-folding that occurs
737 * in HFS+, but this is enough to catch our fairly vanilla
738 * hard-coded needles.
740 for (; needle_len > 0; needle++, needle_len--) {
741 c = next_hfs_char(&path);
744 * We know our needles contain only ASCII, so we clamp here to
745 * make the results of tolower() sane.
747 if (c > 127)
748 return 0;
749 if (tolower(c) != *needle)
750 return 0;
753 c = next_hfs_char(&path);
754 if (c && !is_dir_sep(c))
755 return 0;
757 return 1;
761 * Inline wrapper to make sure the compiler resolves strlen() on literals at
762 * compile time.
764 static inline int is_hfs_dot_str(const char *path, const char *needle)
766 return is_hfs_dot_generic(path, needle, strlen(needle));
769 int is_hfs_dotgit(const char *path)
771 return is_hfs_dot_str(path, "git");
774 int is_hfs_dotgitmodules(const char *path)
776 return is_hfs_dot_str(path, "gitmodules");
779 int is_hfs_dotgitignore(const char *path)
781 return is_hfs_dot_str(path, "gitignore");
784 int is_hfs_dotgitattributes(const char *path)
786 return is_hfs_dot_str(path, "gitattributes");
789 int is_hfs_dotmailmap(const char *path)
791 return is_hfs_dot_str(path, "mailmap");
794 const char utf8_bom[] = "\357\273\277";
796 int skip_utf8_bom(char **text, size_t len)
798 if (len < strlen(utf8_bom) ||
799 memcmp(*text, utf8_bom, strlen(utf8_bom)))
800 return 0;
801 *text += strlen(utf8_bom);
802 return 1;
805 void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
806 const char *s)
808 size_t slen = strlen(s);
809 int display_len = utf8_strnwidth(s, slen, 0);
810 int utf8_compensation = slen - display_len;
812 if (display_len >= width) {
813 strbuf_addstr(buf, s);
814 return;
817 if (position == ALIGN_LEFT)
818 strbuf_addf(buf, "%-*s", width + utf8_compensation, s);
819 else if (position == ALIGN_MIDDLE) {
820 int left = (width - display_len) / 2;
821 strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s);
822 } else if (position == ALIGN_RIGHT)
823 strbuf_addf(buf, "%*s", width + utf8_compensation, s);