[git commit master] more fine-grained Unicode support
Denys Vlasenko
vda.linux at googlemail.com
Fri Jan 29 08:12:31 UTC 2010
commit: http://git.busybox.net/busybox/commit/?id=2edba21f4c59d071f2241c2f47021c7034ec7cb8
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
Config.in | 51 ++++++++++++++++++++++++++++
libbb/unicode.c | 86 ++++++++++++++++++++++++++++++++++++++---------
libbb/unicode_wcwidth.c | 24 ++++++++++++-
3 files changed, 143 insertions(+), 18 deletions(-)
diff --git a/Config.in b/Config.in
index 8e75153..6844483 100644
--- a/Config.in
+++ b/Config.in
@@ -141,6 +141,57 @@ config FEATURE_CHECK_UNICODE_IN_ENV
Otherwise, Unicode support will be always enabled and active.
+config SUBST_WCHAR
+ int "Character code to substitute unprintable characters with"
+ range 1 4294967295
+ depends on FEATURE_ASSUME_UNICODE
+ default 63
+ help
+ Typical values are 63 for '?' (works with any output device),
+ 30 for ASCII substitute control code,
+ 65533 (0xfffd) for Unicode replacement character.
+
+config LAST_SUPPORTED_WCHAR
+ int "Range of supported Unicode characters"
+ range 0 4294967295
+ depends on FEATURE_ASSUME_UNICODE
+ default 767
+ help
+ Any character with Unicode value bigger than this is assumed
+ to be non-printable on output device. Many applets replace
+ such chars with substitution character.
+
+ The idea is that many valid printable Unicode chars are
+ nevertheless are not displayed correctly. Think about
+ combining charachers, double-wide hieroglyphs and such.
+ Many terminals, xterms and such will fail to handle them
+ correctly.
+
+ Typical values are:
+ 126 - ASCII only
+ 767 (0x2ff) - there are no combining chars in [0..767] range
+ (the range includes Latin 1, Latin Ext. A and B),
+ code is ~700 bytes smaller for this case.
+ 4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
+ code is ~300 bytes smaller for this case.
+ 0 - off, any valid printable Unicode character will be printed.
+
+config UNICODE_COMBINING_WCHARS
+ bool "Allow zero-width Unicode characters on output"
+ default n
+ depends on FEATURE_ASSUME_UNICODE
+ help
+ With this option off, any Unicode char with width of 0
+ is substituted on output.
+
+config UNICODE_WIDE_WCHARS
+ bool "Allow wide Unicode characters on output"
+ default n
+ depends on FEATURE_ASSUME_UNICODE
+ help
+ With this option off, any Unicode char with width > 1
+ is substituted on output.
+
config LONG_OPTS
bool "Support for --long-options"
default y
diff --git a/libbb/unicode.c b/libbb/unicode.c
index 39b173e..878af84 100644
--- a/libbb/unicode.c
+++ b/libbb/unicode.c
@@ -216,8 +216,6 @@ size_t FAST_FUNC mbstowcs(wchar_t *dest, const char *src, size_t n)
return org_n - n;
}
-#include "unicode_wcwidth.c"
-
int FAST_FUNC iswspace(wint_t wc)
{
return (unsigned)wc <= 0x7f && isspace(wc);
@@ -233,6 +231,8 @@ int FAST_FUNC iswpunct(wint_t wc)
return (unsigned)wc <= 0x7f && ispunct(wc);
}
+#include "unicode_wcwidth.c"
+
#endif /* Homegrown Unicode support */
@@ -251,8 +251,22 @@ char* FAST_FUNC unicode_cut_nchars(unsigned width, const char *src)
char *dst;
unsigned dst_len;
- if (unicode_status != UNICODE_ON)
- return xasprintf("%-*.*s", width, width, src);
+ if (unicode_status != UNICODE_ON) {
+ char *d = dst = xmalloc(width + 1);
+ while ((int)--width >= 0) {
+ unsigned char c = *src;
+ if (c == '\0') {
+ do
+ *d++ = ' ';
+ while ((int)--width >= 0);
+ break;
+ }
+ *d++ = (c >= ' ' && c < 0x7f) ? c : '?';
+ src++;
+ }
+ *d = '\0';
+ return dst;
+ }
dst = NULL;
dst_len = 0;
@@ -260,31 +274,64 @@ char* FAST_FUNC unicode_cut_nchars(unsigned width, const char *src)
int w;
wchar_t wc;
- dst = xrealloc(dst, dst_len + 2 * MB_CUR_MAX);
#if ENABLE_LOCALE_SUPPORT
{
mbstate_t mbst = { 0 };
ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst);
- if (rc <= 0) /* error, or end-of-string */
+ /* If invalid sequence is seen: -1 is returned,
+ * src points to the invalid sequence, errno = EILSEQ.
+ * Else number of wchars (excluding terminating L'\0')
+ * written to dest is returned.
+ * If len (here: 1) non-L'\0' wchars stored at dest,
+ * src points to the next char to be converted.
+ * If string is completely converted: src = NULL.
+ */
+ if (rc == 0) /* end-of-string */
break;
+ if (rc < 0) { /* error */
+ src++;
+ goto subst;
+ }
+ if (!iswprint(wc))
+ goto subst;
}
#else
- src = mbstowc_internal(&wc, src);
- if (!src || wc == 0) /* error, or end-of-string */
- break;
+ {
+ const char *src1 = mbstowc_internal(&wc, src);
+ /* src = NULL: invalid sequence is seen,
+ * else: wc is set, src is advanced to next mb char
+ */
+ if (src1) {/* no error */
+ if (wc == 0) /* end-of-string */
+ break;
+ src = src1;
+ } else { /* error */
+ src++;
+ goto subst;
+ }
+ }
#endif
+ if (CONFIG_LAST_SUPPORTED_WCHAR && wc > CONFIG_LAST_SUPPORTED_WCHAR)
+ goto subst;
w = wcwidth(wc);
- if (w < 0) /* non-printable wchar */
- break;
+ if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0) /* non-printable wchar */
+ || (!ENABLE_UNICODE_COMBINING_WCHARS && wc <= 0)
+ || (!ENABLE_UNICODE_WIDE_WCHARS && wc > 1)
+ ) {
+ subst:
+ wc = CONFIG_SUBST_WCHAR;
+ w = 1;
+ }
width -= w;
- if ((int)width < 0) { /* string is longer than width */
+ /* Note: if width == 0, we still may add more chars,
+ * they may be zero-width or combining ones */
+ if ((int)width < 0) {
+ /* can't add this wc, string would become longer than width */
width += w;
- while (width) {
- dst[dst_len++] = ' ';
- width--;
- }
break;
}
+
+ dst = xrealloc(dst, dst_len + MB_CUR_MAX);
#if ENABLE_LOCALE_SUPPORT
{
mbstate_t mbst = { 0 };
@@ -294,7 +341,14 @@ char* FAST_FUNC unicode_cut_nchars(unsigned width, const char *src)
dst_len += wcrtomb_internal(&dst[dst_len], wc);
#endif
}
+
+ /* Pad to remaining width */
+ dst = xrealloc(dst, dst_len + width + 1);
+ while ((int)--width >= 0) {
+ dst[dst_len++] = ' ';
+ }
dst[dst_len] = '\0';
+
return dst;
}
diff --git a/libbb/unicode_wcwidth.c b/libbb/unicode_wcwidth.c
index 8d301f7..ab62b18 100644
--- a/libbb/unicode_wcwidth.c
+++ b/libbb/unicode_wcwidth.c
@@ -59,6 +59,13 @@
* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
*/
+#if CONFIG_LAST_SUPPORTED_WCHAR == 0
+# define LAST_SUPPORTED_WCHAR ((1 << 31) - 1)
+#else
+# define LAST_SUPPORTED_WCHAR CONFIG_LAST_SUPPORTED_WCHAR
+#endif
+
+#if LAST_SUPPORTED_WCHAR >= 0x0300
struct interval {
uint16_t first;
uint16_t last;
@@ -111,6 +118,7 @@ static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
}
return 0;
}
+#endif
/* The following two functions define the column width of an ISO 10646
@@ -146,6 +154,7 @@ static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
*/
static int wcwidth(unsigned ucs)
{
+#if LAST_SUPPORTED_WCHAR >= 0x0300
/* sorted list of non-overlapping intervals of non-spacing characters */
/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
static const struct interval combining[] = {
@@ -420,12 +429,15 @@ static int wcwidth(unsigned ucs)
#undef BIG_
#undef PAIR
};
+# if LAST_SUPPORTED_WCHAR >= 0x1100
static const struct interval combining0x10000[] = {
{ 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F },
{ 0x0A38, 0x0A3A }, { 0x0A3F, 0x0A3F }, { 0xD167, 0xD169 },
{ 0xD173, 0xD182 }, { 0xD185, 0xD18B }, { 0xD1AA, 0xD1AD },
{ 0xD242, 0xD244 }
};
+# endif
+#endif
if (ucs == 0)
return 0;
@@ -435,6 +447,9 @@ static int wcwidth(unsigned ucs)
if (ucs < 0x0300) /* optimization */
return 1;
+#if LAST_SUPPORTED_WCHAR < 0x0300
+ return -1;
+#else
/* binary search in table of non-spacing characters */
if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1))
return 0;
@@ -444,6 +459,9 @@ static int wcwidth(unsigned ucs)
if (ucs < 0x1100) /* optimization */
return 1;
+# if LAST_SUPPORTED_WCHAR < 0x1100
+ return -1;
+# else
/* binary search in table of non-spacing characters, cont. */
if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1))
return 0;
@@ -458,8 +476,8 @@ static int wcwidth(unsigned ucs)
return 1 +
( (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */
- || ucs == 0x2329
- || ucs == 0x232a
+ || ucs == 0x2329 /* left-pointing angle bracket; also CJK punct. char */
+ || ucs == 0x232a /* right-pointing angle bracket; also CJK punct. char */
|| (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) /* CJK ... Yi */
|| (ucs >= 0xac00 && ucs <= 0xd7a3) /* Hangul Syllables */
|| (ucs >= 0xf900 && ucs <= 0xfaff) /* CJK Compatibility Ideographs */
@@ -470,4 +488,6 @@ static int wcwidth(unsigned ucs)
|| (ucs >= 0x20000 && ucs <= 0x2fffd)
|| (ucs >= 0x30000 && ucs <= 0x3fffd)
);
+# endif
+#endif
}
--
1.6.3.3
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