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https://github.com/topjohnwu/ndk-busybox.git
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more fine-grained Unicode support
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
083e172641
commit
2edba21f4c
51
Config.in
51
Config.in
@ -141,6 +141,57 @@ config FEATURE_CHECK_UNICODE_IN_ENV
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Otherwise, Unicode support will be always enabled and active.
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config SUBST_WCHAR
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int "Character code to substitute unprintable characters with"
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range 1 4294967295
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depends on FEATURE_ASSUME_UNICODE
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default 63
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help
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Typical values are 63 for '?' (works with any output device),
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30 for ASCII substitute control code,
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65533 (0xfffd) for Unicode replacement character.
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config LAST_SUPPORTED_WCHAR
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int "Range of supported Unicode characters"
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range 0 4294967295
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depends on FEATURE_ASSUME_UNICODE
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default 767
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help
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Any character with Unicode value bigger than this is assumed
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to be non-printable on output device. Many applets replace
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such chars with substitution character.
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The idea is that many valid printable Unicode chars are
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nevertheless are not displayed correctly. Think about
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combining charachers, double-wide hieroglyphs and such.
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Many terminals, xterms and such will fail to handle them
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correctly.
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Typical values are:
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126 - ASCII only
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767 (0x2ff) - there are no combining chars in [0..767] range
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(the range includes Latin 1, Latin Ext. A and B),
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code is ~700 bytes smaller for this case.
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4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
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code is ~300 bytes smaller for this case.
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0 - off, any valid printable Unicode character will be printed.
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config UNICODE_COMBINING_WCHARS
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bool "Allow zero-width Unicode characters on output"
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default n
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depends on FEATURE_ASSUME_UNICODE
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help
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With this option off, any Unicode char with width of 0
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is substituted on output.
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config UNICODE_WIDE_WCHARS
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bool "Allow wide Unicode characters on output"
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default n
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depends on FEATURE_ASSUME_UNICODE
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help
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With this option off, any Unicode char with width > 1
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is substituted on output.
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config LONG_OPTS
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bool "Support for --long-options"
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default y
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@ -216,8 +216,6 @@ size_t FAST_FUNC mbstowcs(wchar_t *dest, const char *src, size_t n)
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return org_n - n;
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}
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#include "unicode_wcwidth.c"
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int FAST_FUNC iswspace(wint_t wc)
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{
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return (unsigned)wc <= 0x7f && isspace(wc);
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@ -233,6 +231,8 @@ int FAST_FUNC iswpunct(wint_t wc)
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return (unsigned)wc <= 0x7f && ispunct(wc);
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}
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#include "unicode_wcwidth.c"
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#endif /* Homegrown Unicode support */
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@ -251,8 +251,22 @@ char* FAST_FUNC unicode_cut_nchars(unsigned width, const char *src)
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char *dst;
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unsigned dst_len;
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if (unicode_status != UNICODE_ON)
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return xasprintf("%-*.*s", width, width, src);
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if (unicode_status != UNICODE_ON) {
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char *d = dst = xmalloc(width + 1);
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while ((int)--width >= 0) {
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unsigned char c = *src;
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if (c == '\0') {
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do
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*d++ = ' ';
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while ((int)--width >= 0);
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break;
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}
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*d++ = (c >= ' ' && c < 0x7f) ? c : '?';
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src++;
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}
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*d = '\0';
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return dst;
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}
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dst = NULL;
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dst_len = 0;
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@ -260,31 +274,64 @@ char* FAST_FUNC unicode_cut_nchars(unsigned width, const char *src)
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int w;
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wchar_t wc;
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dst = xrealloc(dst, dst_len + 2 * MB_CUR_MAX);
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#if ENABLE_LOCALE_SUPPORT
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{
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mbstate_t mbst = { 0 };
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ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst);
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if (rc <= 0) /* error, or end-of-string */
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/* If invalid sequence is seen: -1 is returned,
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* src points to the invalid sequence, errno = EILSEQ.
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* Else number of wchars (excluding terminating L'\0')
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* written to dest is returned.
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* If len (here: 1) non-L'\0' wchars stored at dest,
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* src points to the next char to be converted.
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* If string is completely converted: src = NULL.
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*/
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if (rc == 0) /* end-of-string */
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break;
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if (rc < 0) { /* error */
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src++;
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goto subst;
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}
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if (!iswprint(wc))
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goto subst;
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}
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#else
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src = mbstowc_internal(&wc, src);
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if (!src || wc == 0) /* error, or end-of-string */
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break;
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#endif
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w = wcwidth(wc);
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if (w < 0) /* non-printable wchar */
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break;
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width -= w;
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if ((int)width < 0) { /* string is longer than width */
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width += w;
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while (width) {
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dst[dst_len++] = ' ';
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width--;
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{
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const char *src1 = mbstowc_internal(&wc, src);
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/* src = NULL: invalid sequence is seen,
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* else: wc is set, src is advanced to next mb char
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*/
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if (src1) {/* no error */
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if (wc == 0) /* end-of-string */
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break;
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src = src1;
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} else { /* error */
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src++;
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goto subst;
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}
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}
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#endif
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if (CONFIG_LAST_SUPPORTED_WCHAR && wc > CONFIG_LAST_SUPPORTED_WCHAR)
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goto subst;
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w = wcwidth(wc);
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if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0) /* non-printable wchar */
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|| (!ENABLE_UNICODE_COMBINING_WCHARS && wc <= 0)
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|| (!ENABLE_UNICODE_WIDE_WCHARS && wc > 1)
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) {
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subst:
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wc = CONFIG_SUBST_WCHAR;
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w = 1;
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}
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width -= w;
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/* Note: if width == 0, we still may add more chars,
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* they may be zero-width or combining ones */
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if ((int)width < 0) {
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/* can't add this wc, string would become longer than width */
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width += w;
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break;
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}
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dst = xrealloc(dst, dst_len + MB_CUR_MAX);
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#if ENABLE_LOCALE_SUPPORT
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{
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mbstate_t mbst = { 0 };
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@ -294,7 +341,14 @@ char* FAST_FUNC unicode_cut_nchars(unsigned width, const char *src)
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dst_len += wcrtomb_internal(&dst[dst_len], wc);
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#endif
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}
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/* Pad to remaining width */
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dst = xrealloc(dst, dst_len + width + 1);
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while ((int)--width >= 0) {
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dst[dst_len++] = ' ';
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}
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dst[dst_len] = '\0';
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return dst;
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}
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@ -59,6 +59,13 @@
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* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
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*/
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#if CONFIG_LAST_SUPPORTED_WCHAR == 0
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# define LAST_SUPPORTED_WCHAR ((1 << 31) - 1)
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#else
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# define LAST_SUPPORTED_WCHAR CONFIG_LAST_SUPPORTED_WCHAR
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#endif
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#if LAST_SUPPORTED_WCHAR >= 0x0300
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struct interval {
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uint16_t first;
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uint16_t last;
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@ -111,6 +118,7 @@ static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
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}
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return 0;
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}
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#endif
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/* The following two functions define the column width of an ISO 10646
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@ -146,6 +154,7 @@ static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
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*/
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static int wcwidth(unsigned ucs)
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{
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#if LAST_SUPPORTED_WCHAR >= 0x0300
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/* sorted list of non-overlapping intervals of non-spacing characters */
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/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
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static const struct interval combining[] = {
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@ -420,12 +429,15 @@ static int wcwidth(unsigned ucs)
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#undef BIG_
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#undef PAIR
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};
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# if LAST_SUPPORTED_WCHAR >= 0x1100
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static const struct interval combining0x10000[] = {
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{ 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F },
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{ 0x0A38, 0x0A3A }, { 0x0A3F, 0x0A3F }, { 0xD167, 0xD169 },
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{ 0xD173, 0xD182 }, { 0xD185, 0xD18B }, { 0xD1AA, 0xD1AD },
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{ 0xD242, 0xD244 }
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};
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# endif
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#endif
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if (ucs == 0)
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return 0;
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@ -435,6 +447,9 @@ static int wcwidth(unsigned ucs)
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if (ucs < 0x0300) /* optimization */
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return 1;
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#if LAST_SUPPORTED_WCHAR < 0x0300
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return -1;
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#else
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/* binary search in table of non-spacing characters */
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if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1))
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return 0;
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@ -444,6 +459,9 @@ static int wcwidth(unsigned ucs)
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if (ucs < 0x1100) /* optimization */
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return 1;
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# if LAST_SUPPORTED_WCHAR < 0x1100
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return -1;
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# else
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/* binary search in table of non-spacing characters, cont. */
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if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1))
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return 0;
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@ -458,8 +476,8 @@ static int wcwidth(unsigned ucs)
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return 1 +
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( (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */
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|| ucs == 0x2329
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|| ucs == 0x232a
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|| ucs == 0x2329 /* left-pointing angle bracket; also CJK punct. char */
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|| ucs == 0x232a /* right-pointing angle bracket; also CJK punct. char */
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|| (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) /* CJK ... Yi */
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|| (ucs >= 0xac00 && ucs <= 0xd7a3) /* Hangul Syllables */
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|| (ucs >= 0xf900 && ucs <= 0xfaff) /* CJK Compatibility Ideographs */
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@ -470,4 +488,6 @@ static int wcwidth(unsigned ucs)
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|| (ucs >= 0x20000 && ucs <= 0x2fffd)
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|| (ucs >= 0x30000 && ucs <= 0x3fffd)
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);
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# endif
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#endif
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}
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