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Differential D6198 Diff 19780 extern/wcwidth/wcwidth.c

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extern/wcwidth/wcwidth.c

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* *
* Permission to use, copy, modify, and distribute this software * Permission to use, copy, modify, and distribute this software
* for any purpose and without fee is hereby granted. The author * for any purpose and without fee is hereby granted. The author
* disclaims all warranties with regard to this software. * disclaims all warranties with regard to this software.
* *
* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
*/ */
#include <wchar.h>
#include "wcwidth.h" #include "wcwidth.h"
struct interval { struct interval {
int first; int first;
int last; int last;
}; };
/* auxiliary function for binary search in interval table */ /* auxiliary function for binary search in interval table */
static int bisearch(wchar_t ucs, const struct interval *table, int max) { static int bisearch(char32_t ucs, const struct interval *table, int max) {
int min = 0; int min = 0;
int mid; int mid;
if (ucs < table[0].first || ucs > table[max].last) if (ucs < table[0].first || ucs > table[max].last)
return 0; return 0;
while (max >= min) { while (max >= min) {
mid = (min + max) / 2; mid = (min + max) / 2;
if (ucs > table[mid].last) if (ucs > table[mid].last)
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* - All remaining characters (including all printable * - All remaining characters (including all printable
* ISO 8859-1 and WGL4 characters, Unicode control characters, * ISO 8859-1 and WGL4 characters, Unicode control characters,
* etc.) have a column width of 1. * etc.) have a column width of 1.
* *
* This implementation assumes that wchar_t characters are encoded * This implementation assumes that wchar_t characters are encoded
* in ISO 10646. * in ISO 10646.
*/ */
int mk_wcwidth(wchar_t ucs) int mk_wcwidth(char32_t ucs)
{ {
/* sorted list of non-overlapping intervals of non-spacing characters */ /* sorted list of non-overlapping intervals of non-spacing characters */
/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */ /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
static const struct interval combining[] = { static const struct interval combining[] = {
{ 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 }, { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
{ 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
{ 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 }, { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
{ 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 }, { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
▲ Show 20 Lines • Show All 68 Lines • ▼ Show 20 Lines (ucs <= 0x115f || /* Hangul Jamo init. consonants */
(ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */ (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
(ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */ (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
(ucs >= 0xffe0 && ucs <= 0xffe6) || (ucs >= 0xffe0 && ucs <= 0xffe6) ||
(ucs >= 0x20000 && ucs <= 0x2fffd) || (ucs >= 0x20000 && ucs <= 0x2fffd) ||
(ucs >= 0x30000 && ucs <= 0x3fffd))); (ucs >= 0x30000 && ucs <= 0x3fffd)));
} }
int mk_wcswidth(const wchar_t *pwcs, size_t n) int mk_wcswidth(const char32_t *pwcs, size_t n)
{ {
int w, width = 0; int w, width = 0;
for (;*pwcs && n-- > 0; pwcs++) for (;*pwcs && n-- > 0; pwcs++)
if ((w = mk_wcwidth(*pwcs)) < 0) if ((w = mk_wcwidth(*pwcs)) < 0)
return -1; return -1;
else else
width += w; width += w;
return width; return width;
} }
/* /*
* The following functions are the same as mk_wcwidth() and * The following functions are the same as mk_wcwidth() and
* mk_wcswidth(), except that spacing characters in the East Asian * mk_wcswidth(), except that spacing characters in the East Asian
* Ambiguous (A) category as defined in Unicode Technical Report #11 * Ambiguous (A) category as defined in Unicode Technical Report #11
* have a column width of 2. This variant might be useful for users of * have a column width of 2. This variant might be useful for users of
* CJK legacy encodings who want to migrate to UCS without changing * CJK legacy encodings who want to migrate to UCS without changing
* the traditional terminal character-width behaviour. It is not * the traditional terminal character-width behaviour. It is not
* otherwise recommended for general use. * otherwise recommended for general use.
*/ */
int mk_wcwidth_cjk(wchar_t ucs) int mk_wcwidth_cjk(char32_t ucs)
{ {
/* sorted list of non-overlapping intervals of East Asian Ambiguous /* sorted list of non-overlapping intervals of East Asian Ambiguous
* characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */ * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
static const struct interval ambiguous[] = { static const struct interval ambiguous[] = {
{ 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 }, { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
{ 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 }, { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
{ 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 }, { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
{ 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 }, { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
▲ Show 20 Lines • Show All 51 Lines • ▼ Show 20 Linesint mk_wcwidth_cjk(char32_t ucs)
if (bisearch(ucs, ambiguous, if (bisearch(ucs, ambiguous,
sizeof(ambiguous) / sizeof(struct interval) - 1)) sizeof(ambiguous) / sizeof(struct interval) - 1))
return 2; return 2;
return mk_wcwidth(ucs); return mk_wcwidth(ucs);
} }
int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n) int mk_wcswidth_cjk(const char32_t *pwcs, size_t n)
{ {
int w, width = 0; int w, width = 0;
for (;*pwcs && n-- > 0; pwcs++) for (;*pwcs && n-- > 0; pwcs++)
if ((w = mk_wcwidth_cjk(*pwcs)) < 0) if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
return -1; return -1;
else else
width += w; width += w;
return width; return width;
} }