| #include "git-compat-util.h" | |
| #include "strbuf.h" | |
| #include "utf8.h" | |
| /* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */ | |
| struct interval { | |
| ucs_char_t first; | |
| ucs_char_t last; | |
| }; | |
| size_t display_mode_esc_sequence_len(const char *s) | |
| { | |
| const char *p = s; | |
| if (*p++ != '\033') | |
| return 0; | |
| if (*p++ != '[') | |
| return 0; | |
| while (isdigit(*p) || *p == ';') | |
| p++; | |
| if (*p++ != 'm') | |
| return 0; | |
| return p - s; | |
| } | |
| /* auxiliary function for binary search in interval table */ | |
| static int bisearch(ucs_char_t ucs, const struct interval *table, int max) | |
| { | |
| int min = 0; | |
| int mid; | |
| if (ucs < table[0].first || ucs > table[max].last) | |
| return 0; | |
| while (max >= min) { | |
| mid = (min + max) / 2; | |
| if (ucs > table[mid].last) | |
| min = mid + 1; | |
| else if (ucs < table[mid].first) | |
| max = mid - 1; | |
| else | |
| return 1; | |
| } | |
| return 0; | |
| } | |
| /* The following two functions define the column width of an ISO 10646 | |
| * character as follows: | |
| * | |
| * - The null character (U+0000) has a column width of 0. | |
| * | |
| * - Other C0/C1 control characters and DEL will lead to a return | |
| * value of -1. | |
| * | |
| * - Non-spacing and enclosing combining characters (general | |
| * category code Mn or Me in the Unicode database) have a | |
| * column width of 0. | |
| * | |
| * - SOFT HYPHEN (U+00AD) has a column width of 1. | |
| * | |
| * - Other format characters (general category code Cf in the Unicode | |
| * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. | |
| * | |
| * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) | |
| * have a column width of 0. | |
| * | |
| * - Spacing characters in the East Asian Wide (W) or East Asian | |
| * Full-width (F) category as defined in Unicode Technical | |
| * Report #11 have a column width of 2. | |
| * | |
| * - All remaining characters (including all printable | |
| * ISO 8859-1 and WGL4 characters, Unicode control characters, | |
| * etc.) have a column width of 1. | |
| * | |
| * This implementation assumes that ucs_char_t characters are encoded | |
| * in ISO 10646. | |
| */ | |
| static int git_wcwidth(ucs_char_t ch) | |
| { | |
| /* | |
| * Sorted list of non-overlapping intervals of non-spacing characters, | |
| */ | |
| #include "unicode_width.h" | |
| /* test for 8-bit control characters */ | |
| if (ch == 0) | |
| return 0; | |
| if (ch < 32 || (ch >= 0x7f && ch < 0xa0)) | |
| return -1; | |
| /* binary search in table of non-spacing characters */ | |
| if (bisearch(ch, zero_width, sizeof(zero_width) | |
| / sizeof(struct interval) - 1)) | |
| return 0; | |
| /* binary search in table of double width characters */ | |
| if (bisearch(ch, double_width, sizeof(double_width) | |
| / sizeof(struct interval) - 1)) | |
| return 2; | |
| return 1; | |
| } | |
| /* | |
| * Pick one ucs character starting from the location *start points at, | |
| * and return it, while updating the *start pointer to point at the | |
| * end of that character. When remainder_p is not NULL, the location | |
| * holds the number of bytes remaining in the string that we are allowed | |
| * to pick from. Otherwise we are allowed to pick up to the NUL that | |
| * would eventually appear in the string. *remainder_p is also reduced | |
| * by the number of bytes we have consumed. | |
| * | |
| * If the string was not a valid UTF-8, *start pointer is set to NULL | |
| * and the return value is undefined. | |
| */ | |
| static ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p) | |
| { | |
| unsigned char *s = (unsigned char *)*start; | |
| ucs_char_t ch; | |
| size_t remainder, incr; | |
| /* | |
| * A caller that assumes NUL terminated text can choose | |
| * not to bother with the remainder length. We will | |
| * stop at the first NUL. | |
| */ | |
| remainder = (remainder_p ? *remainder_p : 999); | |
| if (remainder < 1) { | |
| goto invalid; | |
| } else if (*s < 0x80) { | |
| /* 0xxxxxxx */ | |
| ch = *s; | |
| incr = 1; | |
| } else if ((s[0] & 0xe0) == 0xc0) { | |
| /* 110XXXXx 10xxxxxx */ | |
| if (remainder < 2 || | |
| (s[1] & 0xc0) != 0x80 || | |
| (s[0] & 0xfe) == 0xc0) | |
| goto invalid; | |
| ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); | |
| incr = 2; | |
| } else if ((s[0] & 0xf0) == 0xe0) { | |
| /* 1110XXXX 10Xxxxxx 10xxxxxx */ | |
| if (remainder < 3 || | |
| (s[1] & 0xc0) != 0x80 || | |
| (s[2] & 0xc0) != 0x80 || | |
| /* overlong? */ | |
| (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || | |
| /* surrogate? */ | |
| (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) || | |
| /* U+FFFE or U+FFFF? */ | |
| (s[0] == 0xef && s[1] == 0xbf && | |
| (s[2] & 0xfe) == 0xbe)) | |
| goto invalid; | |
| ch = ((s[0] & 0x0f) << 12) | | |
| ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); | |
| incr = 3; | |
| } else if ((s[0] & 0xf8) == 0xf0) { | |
| /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */ | |
| if (remainder < 4 || | |
| (s[1] & 0xc0) != 0x80 || | |
| (s[2] & 0xc0) != 0x80 || | |
| (s[3] & 0xc0) != 0x80 || | |
| /* overlong? */ | |
| (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) || | |
| /* > U+10FFFF? */ | |
| (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) | |
| goto invalid; | |
| ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) | | |
| ((s[2] & 0x3f) << 6) | (s[3] & 0x3f); | |
| incr = 4; | |
| } else { | |
| invalid: | |
| *start = NULL; | |
| return 0; | |
| } | |
| *start += incr; | |
| if (remainder_p) | |
| *remainder_p = remainder - incr; | |
| return ch; | |
| } | |
| /* | |
| * This function returns the number of columns occupied by the character | |
| * pointed to by the variable start. The pointer is updated to point at | |
| * the next character. When remainder_p is not NULL, it points at the | |
| * location that stores the number of remaining bytes we can use to pick | |
| * a character (see pick_one_utf8_char() above). | |
| */ | |
| int utf8_width(const char **start, size_t *remainder_p) | |
| { | |
| ucs_char_t ch = pick_one_utf8_char(start, remainder_p); | |
| if (!*start) | |
| return 0; | |
| return git_wcwidth(ch); | |
| } | |
| /* | |
| * Returns the total number of columns required by a null-terminated | |
| * string, assuming that the string is utf8. Returns strlen() instead | |
| * if the string does not look like a valid utf8 string. | |
| */ | |
| int utf8_strnwidth(const char *string, int len, int skip_ansi) | |
| { | |
| int width = 0; | |
| const char *orig = string; | |
| if (len == -1) | |
| len = strlen(string); | |
| while (string && string < orig + len) { | |
| int skip; | |
| while (skip_ansi && | |
| (skip = display_mode_esc_sequence_len(string)) != 0) | |
| string += skip; | |
| width += utf8_width(&string, NULL); | |
| } | |
| return string ? width : len; | |
| } | |
| int utf8_strwidth(const char *string) | |
| { | |
| return utf8_strnwidth(string, -1, 0); | |
| } | |
| int is_utf8(const char *text) | |
| { | |
| while (*text) { | |
| if (*text == '\n' || *text == '\t' || *text == '\r') { | |
| text++; | |
| continue; | |
| } | |
| utf8_width(&text, NULL); | |
| if (!text) | |
| return 0; | |
| } | |
| return 1; | |
| } | |
| static void strbuf_add_indented_text(struct strbuf *buf, const char *text, | |
| int indent, int indent2) | |
| { | |
| if (indent < 0) | |
| indent = 0; | |
| while (*text) { | |
| const char *eol = strchrnul(text, '\n'); | |
| if (*eol == '\n') | |
| eol++; | |
| strbuf_addchars(buf, ' ', indent); | |
| strbuf_add(buf, text, eol - text); | |
| text = eol; | |
| indent = indent2; | |
| } | |
| } | |
| /* | |
| * Wrap the text, if necessary. The variable indent is the indent for the | |
| * first line, indent2 is the indent for all other lines. | |
| * If indent is negative, assume that already -indent columns have been | |
| * consumed (and no extra indent is necessary for the first line). | |
| */ | |
| void strbuf_add_wrapped_text(struct strbuf *buf, | |
| const char *text, int indent1, int indent2, int width) | |
| { | |
| int indent, w, assume_utf8 = 1; | |
| const char *bol, *space, *start = text; | |
| size_t orig_len = buf->len; | |
| if (width <= 0) { | |
| strbuf_add_indented_text(buf, text, indent1, indent2); | |
| return; | |
| } | |
| retry: | |
| bol = text; | |
| w = indent = indent1; | |
| space = NULL; | |
| if (indent < 0) { | |
| w = -indent; | |
| space = text; | |
| } | |
| for (;;) { | |
| char c; | |
| size_t skip; | |
| while ((skip = display_mode_esc_sequence_len(text))) | |
| text += skip; | |
| c = *text; | |
| if (!c || isspace(c)) { | |
| if (w <= width || !space) { | |
| const char *start = bol; | |
| if (!c && text == start) | |
| return; | |
| if (space) | |
| start = space; | |
| else | |
| strbuf_addchars(buf, ' ', indent); | |
| strbuf_add(buf, start, text - start); | |
| if (!c) | |
| return; | |
| space = text; | |
| if (c == '\t') | |
| w |= 0x07; | |
| else if (c == '\n') { | |
| space++; | |
| if (*space == '\n') { | |
| strbuf_addch(buf, '\n'); | |
| goto new_line; | |
| } | |
| else if (!isalnum(*space)) | |
| goto new_line; | |
| else | |
| strbuf_addch(buf, ' '); | |
| } | |
| w++; | |
| text++; | |
| } | |
| else { | |
| new_line: | |
| strbuf_addch(buf, '\n'); | |
| text = bol = space + isspace(*space); | |
| space = NULL; | |
| w = indent = indent2; | |
| } | |
| continue; | |
| } | |
| if (assume_utf8) { | |
| w += utf8_width(&text, NULL); | |
| if (!text) { | |
| assume_utf8 = 0; | |
| text = start; | |
| strbuf_setlen(buf, orig_len); | |
| goto retry; | |
| } | |
| } else { | |
| w++; | |
| text++; | |
| } | |
| } | |
| } | |
| void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len, | |
| int indent, int indent2, int width) | |
| { | |
| char *tmp = xstrndup(data, len); | |
| strbuf_add_wrapped_text(buf, tmp, indent, indent2, width); | |
| free(tmp); | |
| } | |
| void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width, | |
| const char *subst) | |
| { | |
| struct strbuf sb_dst = STRBUF_INIT; | |
| char *src = sb_src->buf; | |
| char *end = src + sb_src->len; | |
| char *dst; | |
| int w = 0, subst_len = 0; | |
| if (subst) | |
| subst_len = strlen(subst); | |
| strbuf_grow(&sb_dst, sb_src->len + subst_len); | |
| dst = sb_dst.buf; | |
| while (src < end) { | |
| char *old; | |
| size_t n; | |
| while ((n = display_mode_esc_sequence_len(src))) { | |
| memcpy(dst, src, n); | |
| src += n; | |
| dst += n; | |
| } | |
| if (src >= end) | |
| break; | |
| old = src; | |
| n = utf8_width((const char**)&src, NULL); | |
| if (!src) /* broken utf-8, do nothing */ | |
| return; | |
| if (n && w >= pos && w < pos + width) { | |
| if (subst) { | |
| memcpy(dst, subst, subst_len); | |
| dst += subst_len; | |
| subst = NULL; | |
| } | |
| w += n; | |
| continue; | |
| } | |
| memcpy(dst, old, src - old); | |
| dst += src - old; | |
| w += n; | |
| } | |
| strbuf_setlen(&sb_dst, dst - sb_dst.buf); | |
| strbuf_swap(sb_src, &sb_dst); | |
| strbuf_release(&sb_dst); | |
| } | |
| int is_encoding_utf8(const char *name) | |
| { | |
| if (!name) | |
| return 1; | |
| if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8")) | |
| return 1; | |
| return 0; | |
| } | |
| int same_encoding(const char *src, const char *dst) | |
| { | |
| if (is_encoding_utf8(src) && is_encoding_utf8(dst)) | |
| return 1; | |
| return !strcasecmp(src, dst); | |
| } | |
| /* | |
| * Wrapper for fprintf and returns the total number of columns required | |
| * for the printed string, assuming that the string is utf8. | |
| */ | |
| int utf8_fprintf(FILE *stream, const char *format, ...) | |
| { | |
| struct strbuf buf = STRBUF_INIT; | |
| va_list arg; | |
| int columns; | |
| va_start(arg, format); | |
| strbuf_vaddf(&buf, format, arg); | |
| va_end(arg); | |
| columns = fputs(buf.buf, stream); | |
| if (0 <= columns) /* keep the error from the I/O */ | |
| columns = utf8_strwidth(buf.buf); | |
| strbuf_release(&buf); | |
| return columns; | |
| } | |
| /* | |
| * Given a buffer and its encoding, return it re-encoded | |
| * with iconv. If the conversion fails, returns NULL. | |
| */ | |
| #ifndef NO_ICONV | |
| #if defined(OLD_ICONV) || (defined(__sun__) && !defined(_XPG6)) | |
| typedef const char * iconv_ibp; | |
| #else | |
| typedef char * iconv_ibp; | |
| #endif | |
| char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv, int *outsz_p) | |
| { | |
| size_t outsz, outalloc; | |
| char *out, *outpos; | |
| iconv_ibp cp; | |
| outsz = insz; | |
| outalloc = outsz + 1; /* for terminating NUL */ | |
| out = xmalloc(outalloc); | |
| outpos = out; | |
| cp = (iconv_ibp)in; | |
| while (1) { | |
| size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz); | |
| if (cnt == (size_t) -1) { | |
| size_t sofar; | |
| if (errno != E2BIG) { | |
| free(out); | |
| return NULL; | |
| } | |
| /* insz has remaining number of bytes. | |
| * since we started outsz the same as insz, | |
| * it is likely that insz is not enough for | |
| * converting the rest. | |
| */ | |
| sofar = outpos - out; | |
| outalloc = sofar + insz * 2 + 32; | |
| out = xrealloc(out, outalloc); | |
| outpos = out + sofar; | |
| outsz = outalloc - sofar - 1; | |
| } | |
| else { | |
| *outpos = '\0'; | |
| if (outsz_p) | |
| *outsz_p = outpos - out; | |
| break; | |
| } | |
| } | |
| return out; | |
| } | |
| static const char *fallback_encoding(const char *name) | |
| { | |
| /* | |
| * Some platforms do not have the variously spelled variants of | |
| * UTF-8, so let's fall back to trying the most official | |
| * spelling. We do so only as a fallback in case the platform | |
| * does understand the user's spelling, but not our official | |
| * one. | |
| */ | |
| if (is_encoding_utf8(name)) | |
| return "UTF-8"; | |
| /* | |
| * Even though latin-1 is still seen in e-mail | |
| * headers, some platforms only install ISO-8859-1. | |
| */ | |
| if (!strcasecmp(name, "latin-1")) | |
| return "ISO-8859-1"; | |
| return name; | |
| } | |
| char *reencode_string_len(const char *in, int insz, | |
| const char *out_encoding, const char *in_encoding, | |
| int *outsz) | |
| { | |
| iconv_t conv; | |
| char *out; | |
| if (!in_encoding) | |
| return NULL; | |
| conv = iconv_open(out_encoding, in_encoding); | |
| if (conv == (iconv_t) -1) { | |
| in_encoding = fallback_encoding(in_encoding); | |
| out_encoding = fallback_encoding(out_encoding); | |
| conv = iconv_open(out_encoding, in_encoding); | |
| if (conv == (iconv_t) -1) | |
| return NULL; | |
| } | |
| out = reencode_string_iconv(in, insz, conv, outsz); | |
| iconv_close(conv); | |
| return out; | |
| } | |
| #endif | |
| /* | |
| * Returns first character length in bytes for multi-byte `text` according to | |
| * `encoding`. | |
| * | |
| * - The `text` pointer is updated to point at the next character. | |
| * - When `remainder_p` is not NULL, on entry `*remainder_p` is how much bytes | |
| * we can consume from text, and on exit `*remainder_p` is reduced by returned | |
| * character length. Otherwise `text` is treated as limited by NUL. | |
| */ | |
| int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding) | |
| { | |
| int chrlen; | |
| const char *p = *text; | |
| size_t r = (remainder_p ? *remainder_p : SIZE_MAX); | |
| if (r < 1) | |
| return 0; | |
| if (is_encoding_utf8(encoding)) { | |
| pick_one_utf8_char(&p, &r); | |
| chrlen = p ? (p - *text) | |
| : 1 /* not valid UTF-8 -> raw byte sequence */; | |
| } | |
| else { | |
| /* | |
| * TODO use iconv to decode one char and obtain its chrlen | |
| * for now, let's treat encodings != UTF-8 as one-byte | |
| */ | |
| chrlen = 1; | |
| } | |
| *text += chrlen; | |
| if (remainder_p) | |
| *remainder_p -= chrlen; | |
| return chrlen; | |
| } | |
| /* | |
| * Pick the next char from the stream, ignoring codepoints an HFS+ would. | |
| * Note that this is _not_ complete by any means. It's just enough | |
| * to make is_hfs_dotgit() work, and should not be used otherwise. | |
| */ | |
| static ucs_char_t next_hfs_char(const char **in) | |
| { | |
| while (1) { | |
| ucs_char_t out = pick_one_utf8_char(in, NULL); | |
| /* | |
| * check for malformed utf8. Technically this | |
| * gets converted to a percent-sequence, but | |
| * returning 0 is good enough for is_hfs_dotgit | |
| * to realize it cannot be .git | |
| */ | |
| if (!*in) | |
| return 0; | |
| /* these code points are ignored completely */ | |
| switch (out) { | |
| case 0x200c: /* ZERO WIDTH NON-JOINER */ | |
| case 0x200d: /* ZERO WIDTH JOINER */ | |
| case 0x200e: /* LEFT-TO-RIGHT MARK */ | |
| case 0x200f: /* RIGHT-TO-LEFT MARK */ | |
| case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */ | |
| case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */ | |
| case 0x202c: /* POP DIRECTIONAL FORMATTING */ | |
| case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */ | |
| case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */ | |
| case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */ | |
| case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */ | |
| case 0x206c: /* INHIBIT ARABIC FORM SHAPING */ | |
| case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */ | |
| case 0x206e: /* NATIONAL DIGIT SHAPES */ | |
| case 0x206f: /* NOMINAL DIGIT SHAPES */ | |
| case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */ | |
| continue; | |
| } | |
| return out; | |
| } | |
| } | |
| int is_hfs_dotgit(const char *path) | |
| { | |
| ucs_char_t c; | |
| c = next_hfs_char(&path); | |
| if (c != '.') | |
| return 0; | |
| c = next_hfs_char(&path); | |
| /* | |
| * there's a great deal of other case-folding that occurs | |
| * in HFS+, but this is enough to catch anything that will | |
| * convert to ".git" | |
| */ | |
| if (c != 'g' && c != 'G') | |
| return 0; | |
| c = next_hfs_char(&path); | |
| if (c != 'i' && c != 'I') | |
| return 0; | |
| c = next_hfs_char(&path); | |
| if (c != 't' && c != 'T') | |
| return 0; | |
| c = next_hfs_char(&path); | |
| if (c && !is_dir_sep(c)) | |
| return 0; | |
| return 1; | |
| } | |
| const char utf8_bom[] = "\357\273\277"; | |
| int skip_utf8_bom(char **text, size_t len) | |
| { | |
| if (len < strlen(utf8_bom) || | |
| memcmp(*text, utf8_bom, strlen(utf8_bom))) | |
| return 0; | |
| *text += strlen(utf8_bom); | |
| return 1; | |
| } | |
| void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width, | |
| const char *s) | |
| { | |
| int slen = strlen(s); | |
| int display_len = utf8_strnwidth(s, slen, 0); | |
| int utf8_compensation = slen - display_len; | |
| if (display_len >= width) { | |
| strbuf_addstr(buf, s); | |
| return; | |
| } | |
| if (position == ALIGN_LEFT) | |
| strbuf_addf(buf, "%-*s", width + utf8_compensation, s); | |
| else if (position == ALIGN_MIDDLE) { | |
| int left = (width - display_len) / 2; | |
| strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s); | |
| } else if (position == ALIGN_RIGHT) | |
| strbuf_addf(buf, "%*s", width + utf8_compensation, s); | |
| } |
