diff options
Diffstat (limited to 'third_party/git/utf8.c')
| -rw-r--r-- | third_party/git/utf8.c | 813 |
1 files changed, 0 insertions, 813 deletions
diff --git a/third_party/git/utf8.c b/third_party/git/utf8.c deleted file mode 100644 index 3b42fadffd..0000000000 --- a/third_party/git/utf8.c +++ /dev/null @@ -1,813 +0,0 @@ -#include "git-compat-util.h" -#include "strbuf.h" -#include "utf8.h" - -/* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */ - -static const char utf16_be_bom[] = {'\xFE', '\xFF'}; -static const char utf16_le_bom[] = {'\xFF', '\xFE'}; -static const char utf32_be_bom[] = {'\0', '\0', '\xFE', '\xFF'}; -static const char utf32_le_bom[] = {'\xFF', '\xFE', '\0', '\0'}; - -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 - min) / 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 */ - goto out; - 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); -out: - strbuf_release(&sb_dst); -} - -/* - * Returns true (1) if the src encoding name matches the dst encoding - * name directly or one of its alternative names. E.g. UTF-16BE is the - * same as UTF16BE. - */ -static int same_utf_encoding(const char *src, const char *dst) -{ - if (istarts_with(src, "utf") && istarts_with(dst, "utf")) { - /* src[3] or dst[3] might be '\0' */ - int i = (src[3] == '-' ? 4 : 3); - int j = (dst[3] == '-' ? 4 : 3); - return !strcasecmp(src+i, dst+j); - } - return 0; -} - -int is_encoding_utf8(const char *name) -{ - if (!name) - return 1; - if (same_utf_encoding("utf-8", name)) - return 1; - return 0; -} - -int same_encoding(const char *src, const char *dst) -{ - static const char utf8[] = "UTF-8"; - - if (!src) - src = utf8; - if (!dst) - dst = utf8; - if (same_utf_encoding(src, 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, - size_t bom_len, size_t *outsz_p) -{ - size_t outsz, outalloc; - char *out, *outpos; - iconv_ibp cp; - - outsz = insz; - outalloc = st_add(outsz, 1 + bom_len); /* for terminating NUL */ - out = xmalloc(outalloc); - outpos = out + bom_len; - 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 = st_add3(sofar, st_mult(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, size_t insz, - const char *out_encoding, const char *in_encoding, - size_t *outsz) -{ - iconv_t conv; - char *out; - const char *bom_str = NULL; - size_t bom_len = 0; - - if (!in_encoding) - return NULL; - - /* UTF-16LE-BOM is the same as UTF-16 for reading */ - if (same_utf_encoding("UTF-16LE-BOM", in_encoding)) - in_encoding = "UTF-16"; - - /* - * For writing, UTF-16 iconv typically creates "UTF-16BE-BOM" - * Some users under Windows want the little endian version - * - * We handle UTF-16 and UTF-32 ourselves only if the platform does not - * provide a BOM (which we require), since we want to match the behavior - * of the system tools and libc as much as possible. - */ - if (same_utf_encoding("UTF-16LE-BOM", out_encoding)) { - bom_str = utf16_le_bom; - bom_len = sizeof(utf16_le_bom); - out_encoding = "UTF-16LE"; - } else if (same_utf_encoding("UTF-16BE-BOM", out_encoding)) { - bom_str = utf16_be_bom; - bom_len = sizeof(utf16_be_bom); - out_encoding = "UTF-16BE"; -#ifdef ICONV_OMITS_BOM - } else if (same_utf_encoding("UTF-16", out_encoding)) { - bom_str = utf16_be_bom; - bom_len = sizeof(utf16_be_bom); - out_encoding = "UTF-16BE"; - } else if (same_utf_encoding("UTF-32", out_encoding)) { - bom_str = utf32_be_bom; - bom_len = sizeof(utf32_be_bom); - out_encoding = "UTF-32BE"; -#endif - } - - 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, bom_len, outsz); - iconv_close(conv); - if (out && bom_str && bom_len) - memcpy(out, bom_str, bom_len); - return out; -} -#endif - -static int has_bom_prefix(const char *data, size_t len, - const char *bom, size_t bom_len) -{ - return data && bom && (len >= bom_len) && !memcmp(data, bom, bom_len); -} - -int has_prohibited_utf_bom(const char *enc, const char *data, size_t len) -{ - return ( - (same_utf_encoding("UTF-16BE", enc) || - same_utf_encoding("UTF-16LE", enc)) && - (has_bom_prefix(data, len, utf16_be_bom, sizeof(utf16_be_bom)) || - has_bom_prefix(data, len, utf16_le_bom, sizeof(utf16_le_bom))) - ) || ( - (same_utf_encoding("UTF-32BE", enc) || - same_utf_encoding("UTF-32LE", enc)) && - (has_bom_prefix(data, len, utf32_be_bom, sizeof(utf32_be_bom)) || - has_bom_prefix(data, len, utf32_le_bom, sizeof(utf32_le_bom))) - ); -} - -int is_missing_required_utf_bom(const char *enc, const char *data, size_t len) -{ - return ( - (same_utf_encoding(enc, "UTF-16")) && - !(has_bom_prefix(data, len, utf16_be_bom, sizeof(utf16_be_bom)) || - has_bom_prefix(data, len, utf16_le_bom, sizeof(utf16_le_bom))) - ) || ( - (same_utf_encoding(enc, "UTF-32")) && - !(has_bom_prefix(data, len, utf32_be_bom, sizeof(utf32_be_bom)) || - has_bom_prefix(data, len, utf32_le_bom, sizeof(utf32_le_bom))) - ); -} - -/* - * 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; - } -} - -static int is_hfs_dot_generic(const char *path, - const char *needle, size_t needle_len) -{ - ucs_char_t c; - - c = next_hfs_char(&path); - if (c != '.') - return 0; - - /* - * there's a great deal of other case-folding that occurs - * in HFS+, but this is enough to catch our fairly vanilla - * hard-coded needles. - */ - for (; needle_len > 0; needle++, needle_len--) { - c = next_hfs_char(&path); - - /* - * We know our needles contain only ASCII, so we clamp here to - * make the results of tolower() sane. - */ - if (c > 127) - return 0; - if (tolower(c) != *needle) - return 0; - } - - c = next_hfs_char(&path); - if (c && !is_dir_sep(c)) - return 0; - - return 1; -} - -/* - * Inline wrapper to make sure the compiler resolves strlen() on literals at - * compile time. - */ -static inline int is_hfs_dot_str(const char *path, const char *needle) -{ - return is_hfs_dot_generic(path, needle, strlen(needle)); -} - -int is_hfs_dotgit(const char *path) -{ - return is_hfs_dot_str(path, "git"); -} - -int is_hfs_dotgitmodules(const char *path) -{ - return is_hfs_dot_str(path, "gitmodules"); -} - -int is_hfs_dotgitignore(const char *path) -{ - return is_hfs_dot_str(path, "gitignore"); -} - -int is_hfs_dotgitattributes(const char *path) -{ - return is_hfs_dot_str(path, "gitattributes"); -} - -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); -} |