| #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_addchars(struct strbuf *sb, int c, size_t n) |
| { |
| strbuf_grow(sb, n); |
| memset(sb->buf + sb->len, c, n); |
| strbuf_setlen(sb, sb->len + n); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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) { |
| /* |
| * 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(in_encoding)) |
| in_encoding = "UTF-8"; |
| if (is_encoding_utf8(out_encoding)) |
| out_encoding = "UTF-8"; |
| 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; |
| } |