зеркало из https://github.com/microsoft/git.git
358 строки
9.9 KiB
C
358 строки
9.9 KiB
C
#include "git-compat-util.h"
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#include "utf8.h"
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/* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */
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typedef unsigned int ucs_char_t; /* assuming 32bit int */
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struct interval {
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int first;
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int last;
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};
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/* auxiliary function for binary search in interval table */
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static int bisearch(ucs_char_t ucs, const struct interval *table, int max)
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{
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int min = 0;
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int mid;
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if (ucs < table[0].first || ucs > table[max].last)
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return 0;
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while (max >= min) {
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mid = (min + max) / 2;
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if (ucs > table[mid].last)
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min = mid + 1;
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else if (ucs < table[mid].first)
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max = mid - 1;
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else
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return 1;
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}
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return 0;
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}
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/* The following two functions define the column width of an ISO 10646
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* character as follows:
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*
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* - The null character (U+0000) has a column width of 0.
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*
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* - Other C0/C1 control characters and DEL will lead to a return
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* value of -1.
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*
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* - Non-spacing and enclosing combining characters (general
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* category code Mn or Me in the Unicode database) have a
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* column width of 0.
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*
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* - SOFT HYPHEN (U+00AD) has a column width of 1.
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*
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* - Other format characters (general category code Cf in the Unicode
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* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
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*
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* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
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* have a column width of 0.
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*
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* - Spacing characters in the East Asian Wide (W) or East Asian
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* Full-width (F) category as defined in Unicode Technical
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* Report #11 have a column width of 2.
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*
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* - All remaining characters (including all printable
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* ISO 8859-1 and WGL4 characters, Unicode control characters,
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* etc.) have a column width of 1.
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*
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* This implementation assumes that ucs_char_t characters are encoded
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* in ISO 10646.
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*/
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static int git_wcwidth(ucs_char_t ch)
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{
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/*
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* Sorted list of non-overlapping intervals of non-spacing characters,
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* generated by
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* "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c".
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*/
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static const struct interval combining[] = {
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{ 0x0300, 0x0357 }, { 0x035D, 0x036F }, { 0x0483, 0x0486 },
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{ 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
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{ 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
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{ 0x05C4, 0x05C4 }, { 0x0600, 0x0603 }, { 0x0610, 0x0615 },
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{ 0x064B, 0x0658 }, { 0x0670, 0x0670 }, { 0x06D6, 0x06E4 },
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{ 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, { 0x070F, 0x070F },
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{ 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 },
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{ 0x0901, 0x0902 }, { 0x093C, 0x093C }, { 0x0941, 0x0948 },
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{ 0x094D, 0x094D }, { 0x0951, 0x0954 }, { 0x0962, 0x0963 },
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{ 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 },
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{ 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 },
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{ 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 },
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{ 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 },
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{ 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 },
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{ 0x0ACD, 0x0ACD }, { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 },
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{ 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
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{ 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
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{ 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
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{ 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
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{ 0x0CBC, 0x0CBC }, { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 },
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{ 0x0CCC, 0x0CCD }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
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{ 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
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{ 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
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{ 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
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{ 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
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{ 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
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{ 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
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{ 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
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{ 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
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{ 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x1712, 0x1714 },
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{ 0x1732, 0x1734 }, { 0x1752, 0x1753 }, { 0x1772, 0x1773 },
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{ 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
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{ 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD }, { 0x180B, 0x180D },
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{ 0x18A9, 0x18A9 }, { 0x1920, 0x1922 }, { 0x1927, 0x1928 },
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{ 0x1932, 0x1932 }, { 0x1939, 0x193B }, { 0x200B, 0x200F },
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{ 0x202A, 0x202E }, { 0x2060, 0x2063 }, { 0x206A, 0x206F },
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{ 0x20D0, 0x20EA }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
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{ 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE23 },
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{ 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }, { 0x1D167, 0x1D169 },
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{ 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B },
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{ 0x1D1AA, 0x1D1AD }, { 0xE0001, 0xE0001 },
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{ 0xE0020, 0xE007F }, { 0xE0100, 0xE01EF }
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};
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/* test for 8-bit control characters */
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if (ch == 0)
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return 0;
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if (ch < 32 || (ch >= 0x7f && ch < 0xa0))
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return -1;
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/* binary search in table of non-spacing characters */
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if (bisearch(ch, combining, sizeof(combining)
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/ sizeof(struct interval) - 1))
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return 0;
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/*
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* If we arrive here, ch is neither a combining nor a C0/C1
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* control character.
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*/
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return 1 +
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(ch >= 0x1100 &&
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/* Hangul Jamo init. consonants */
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(ch <= 0x115f ||
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ch == 0x2329 || ch == 0x232a ||
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/* CJK ... Yi */
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(ch >= 0x2e80 && ch <= 0xa4cf &&
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ch != 0x303f) ||
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/* Hangul Syllables */
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(ch >= 0xac00 && ch <= 0xd7a3) ||
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/* CJK Compatibility Ideographs */
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(ch >= 0xf900 && ch <= 0xfaff) ||
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/* CJK Compatibility Forms */
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(ch >= 0xfe30 && ch <= 0xfe6f) ||
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/* Fullwidth Forms */
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(ch >= 0xff00 && ch <= 0xff60) ||
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(ch >= 0xffe0 && ch <= 0xffe6) ||
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(ch >= 0x20000 && ch <= 0x2fffd) ||
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(ch >= 0x30000 && ch <= 0x3fffd)));
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}
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/*
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* This function returns the number of columns occupied by the character
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* pointed to by the variable start. The pointer is updated to point at
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* the next character. If it was not valid UTF-8, the pointer is set to NULL.
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*/
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int utf8_width(const char **start)
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{
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unsigned char *s = (unsigned char *)*start;
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ucs_char_t ch;
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if (*s < 0x80) {
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/* 0xxxxxxx */
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ch = *s;
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*start += 1;
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} else if ((s[0] & 0xe0) == 0xc0) {
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/* 110XXXXx 10xxxxxx */
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if ((s[1] & 0xc0) != 0x80 ||
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/* overlong? */
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(s[0] & 0xfe) == 0xc0)
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goto invalid;
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ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
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*start += 2;
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} else if ((s[0] & 0xf0) == 0xe0) {
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/* 1110XXXX 10Xxxxxx 10xxxxxx */
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if ((s[1] & 0xc0) != 0x80 ||
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(s[2] & 0xc0) != 0x80 ||
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/* overlong? */
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(s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) ||
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/* surrogate? */
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(s[0] == 0xed && (s[1] & 0xe0) == 0xa0) ||
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/* U+FFFE or U+FFFF? */
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(s[0] == 0xef && s[1] == 0xbf &&
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(s[2] & 0xfe) == 0xbe))
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goto invalid;
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ch = ((s[0] & 0x0f) << 12) |
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((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
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*start += 3;
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} else if ((s[0] & 0xf8) == 0xf0) {
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/* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
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if ((s[1] & 0xc0) != 0x80 ||
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(s[2] & 0xc0) != 0x80 ||
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(s[3] & 0xc0) != 0x80 ||
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/* overlong? */
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(s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) ||
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/* > U+10FFFF? */
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(s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4)
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goto invalid;
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ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) |
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((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
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*start += 4;
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} else {
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invalid:
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*start = NULL;
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return 0;
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}
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return git_wcwidth(ch);
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}
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int is_utf8(const char *text)
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{
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while (*text) {
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if (*text == '\n' || *text == '\t' || *text == '\r') {
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text++;
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continue;
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}
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utf8_width(&text);
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if (!text)
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return 0;
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}
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return 1;
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}
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static void print_spaces(int count)
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{
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static const char s[] = " ";
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while (count >= sizeof(s)) {
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fwrite(s, sizeof(s) - 1, 1, stdout);
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count -= sizeof(s) - 1;
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}
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fwrite(s, count, 1, stdout);
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}
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/*
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* Wrap the text, if necessary. The variable indent is the indent for the
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* first line, indent2 is the indent for all other lines.
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* If indent is negative, assume that already -indent columns have been
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* consumed (and no extra indent is necessary for the first line).
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*/
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int print_wrapped_text(const char *text, int indent, int indent2, int width)
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{
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int w = indent, assume_utf8 = is_utf8(text);
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const char *bol = text, *space = NULL;
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if (indent < 0) {
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w = -indent;
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space = text;
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}
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for (;;) {
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char c = *text;
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if (!c || isspace(c)) {
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if (w < width || !space) {
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const char *start = bol;
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if (space)
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start = space;
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else
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print_spaces(indent);
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fwrite(start, text - start, 1, stdout);
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if (!c)
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return w;
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else if (c == '\t')
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w |= 0x07;
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space = text;
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w++;
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text++;
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}
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else {
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putchar('\n');
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text = bol = space + isspace(*space);
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space = NULL;
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w = indent = indent2;
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}
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continue;
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}
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if (assume_utf8)
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w += utf8_width(&text);
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else {
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w++;
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text++;
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}
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}
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return w;
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}
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int is_encoding_utf8(const char *name)
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{
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if (!name)
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return 1;
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if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8"))
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return 1;
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return 0;
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}
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/*
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* Given a buffer and its encoding, return it re-encoded
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* with iconv. If the conversion fails, returns NULL.
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*/
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#ifndef NO_ICONV
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#ifdef OLD_ICONV
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typedef const char * iconv_ibp;
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#else
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typedef char * iconv_ibp;
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#endif
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char *reencode_string(const char *in, const char *out_encoding, const char *in_encoding)
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{
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iconv_t conv;
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size_t insz, outsz, outalloc;
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char *out, *outpos;
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iconv_ibp cp;
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if (!in_encoding)
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return NULL;
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conv = iconv_open(out_encoding, in_encoding);
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if (conv == (iconv_t) -1)
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return NULL;
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insz = strlen(in);
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outsz = insz;
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outalloc = outsz + 1; /* for terminating NUL */
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out = xmalloc(outalloc);
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outpos = out;
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cp = (iconv_ibp)in;
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while (1) {
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size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz);
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if (cnt == -1) {
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size_t sofar;
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if (errno != E2BIG) {
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free(out);
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iconv_close(conv);
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return NULL;
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}
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/* insz has remaining number of bytes.
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* since we started outsz the same as insz,
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* it is likely that insz is not enough for
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* converting the rest.
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*/
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sofar = outpos - out;
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outalloc = sofar + insz * 2 + 32;
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out = xrealloc(out, outalloc);
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outpos = out + sofar;
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outsz = outalloc - sofar - 1;
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}
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else {
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*outpos = '\0';
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break;
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}
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}
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iconv_close(conv);
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return out;
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}
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#endif
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