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30ebd7bd7838787bdb7de0b484e37e442ab16ac5
busybox/libbb/unicode.c
Tomas Heinrich c5c006c10c lineedit: first shot at optional unicode bidi input support 
function                                             old     new   delta
read_line_input                                     4886    5003    +117
in_uint16_table                                        -      97     +97
in_interval_table                                      -      78     +78
static.rtl_b                                           -      68     +68
unicode_isrtl                                          -      55     +55
isrtl_str                                              -      51     +51
static.rtl_p                                           -      42     +42
unicode_conv_to_printable2                           633     477    -156
------------------------------------------------------------------------------
(add/remove: 6/0 grow/shrink: 1/1 up/down: 508/-156)          Total: 352 bytes

Signed-off-by: Tomas Heinrich <heinrich.tomas@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-03-18 18:35:37 +01:00

561 lines
12 KiB
C
Raw Blame History

/* vi: set sw=4 ts=4: */
/*
* Unicode support routines.
*
* Copyright (C) 2009 Denys Vlasenko
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include "unicode.h"
/* If it's not #defined as a constant in unicode.h... */
#ifndef unicode_status
uint8_t unicode_status;
#endif
/* This file is compiled only if FEATURE_ASSUME_UNICODE is on.
* We check other options and decide whether to use libc support
* via locale, or use our own logic:
*/
#if ENABLE_LOCALE_SUPPORT
/* Unicode support using libc locale support. */
void FAST_FUNC init_unicode(void)
{
/* In unicode, this is a one character string */
static const char unicode_0x394[] = { 0xce, 0x94, 0 };
if (unicode_status != UNICODE_UNKNOWN)
return;
unicode_status = unicode_strlen(unicode_0x394) == 1 ? UNICODE_ON : UNICODE_OFF;
}
#else
/* Homegrown Unicode support. It knows only C and Unicode locales. */
# if ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
void FAST_FUNC init_unicode(void)
{
char *lang;
if (unicode_status != UNICODE_UNKNOWN)
return;
unicode_status = UNICODE_OFF;
lang = getenv("LANG");
if (!lang || !(strstr(lang, ".utf") || strstr(lang, ".UTF")))
return;
unicode_status = UNICODE_ON;
}
# endif
static size_t wcrtomb_internal(char *s, wchar_t wc)
{
int n, i;
uint32_t v = wc;
if (v <= 0x7f) {
*s = v;
return 1;
}
/* RFC 3629 says that Unicode ends at 10FFFF,
* but we cover entire 32 bits */
/* 4000000-FFFFFFFF -> 111111tt 10tttttt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
/* 200000-3FFFFFF -> 111110tt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
/* 10000-1FFFFF -> 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx */
/* 800-FFFF -> 1110yyyy 10yyyyxx 10xxxxxx */
/* 80-7FF -> 110yyyxx 10xxxxxx */
/* How many bytes do we need? */
n = 2;
/* (0x80000000+ would result in n = 7, limiting n to 6) */
while (v >= 0x800 && n < 6) {
v >>= 5;
n++;
}
/* Fill bytes n-1..1 */
i = n;
while (--i) {
s[i] = (wc & 0x3f) | 0x80;
wc >>= 6;
}
/* Fill byte 0 */
s[0] = wc | (uint8_t)(0x3f00 >> n);
return n;
}
size_t FAST_FUNC wcrtomb(char *s, wchar_t wc, mbstate_t *ps UNUSED_PARAM)
{
if (unicode_status != UNICODE_ON) {
*s = wc;
return 1;
}
return wcrtomb_internal(s, wc);
}
size_t FAST_FUNC wcstombs(char *dest, const wchar_t *src, size_t n)
{
size_t org_n = n;
if (unicode_status != UNICODE_ON) {
while (n) {
wchar_t c = *src++;
*dest++ = c;
if (c == 0)
break;
n--;
}
return org_n - n;
}
while (n >= MB_CUR_MAX) {
wchar_t wc = *src++;
size_t len = wcrtomb_internal(dest, wc);
if (wc == L'\0')
return org_n - n;
dest += len;
n -= len;
}
while (n) {
char tbuf[MB_CUR_MAX];
wchar_t wc = *src++;
size_t len = wcrtomb_internal(tbuf, wc);
if (len > n)
len = n;
memcpy(dest, tbuf, len);
if (wc == L'\0')
return org_n - n;
dest += len;
n -= len;
}
return org_n - n;
}
#define ERROR_WCHAR (~(wchar_t)0)
static const char *mbstowc_internal(wchar_t *res, const char *src)
{
int bytes;
unsigned c = (unsigned char) *src++;
if (c <= 0x7f) {
*res = c;
return src;
}
/* 80-7FF -> 110yyyxx 10xxxxxx */
/* 800-FFFF -> 1110yyyy 10yyyyxx 10xxxxxx */
/* 10000-1FFFFF -> 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx */
/* 200000-3FFFFFF -> 111110tt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
/* 4000000-FFFFFFFF -> 111111tt 10tttttt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
bytes = 0;
do {
c <<= 1;
bytes++;
} while ((c & 0x80) && bytes < 6);
if (bytes == 1) {
/* A bare "continuation" byte. Say, 80 */
*res = ERROR_WCHAR;
return src;
}
c = (uint8_t)(c) >> bytes;
while (--bytes) {
unsigned ch = (unsigned char) *src;
if ((ch & 0xc0) != 0x80) {
/* Missing "continuation" byte. Example: e0 80 */
*res = ERROR_WCHAR;
return src;
}
c = (c << 6) + (ch & 0x3f);
src++;
}
/* TODO */
/* Need to check that c isn't produced by overlong encoding */
/* Example: 11000000 10000000 converts to NUL */
/* 11110000 10000000 10000100 10000000 converts to 0x100 */
/* correct encoding: 11000100 10000000 */
if (c <= 0x7f) { /* crude check */
*res = ERROR_WCHAR;
return src;
}
*res = c;
return src;
}
size_t FAST_FUNC mbstowcs(wchar_t *dest, const char *src, size_t n)
{
size_t org_n = n;
if (unicode_status != UNICODE_ON) {
while (n) {
unsigned char c = *src++;
if (dest)
*dest++ = c;
if (c == 0)
break;
n--;
}
return org_n - n;
}
while (n) {
wchar_t wc;
src = mbstowc_internal(&wc, src);
if (wc == ERROR_WCHAR) /* error */
return (size_t) -1L;
if (dest)
*dest++ = wc;
if (wc == 0) /* end-of-string */
break;
n--;
}
return org_n - n;
}
int FAST_FUNC iswspace(wint_t wc)
{
return (unsigned)wc <= 0x7f && isspace(wc);
}
int FAST_FUNC iswalnum(wint_t wc)
{
return (unsigned)wc <= 0x7f && isalnum(wc);
}
int FAST_FUNC iswpunct(wint_t wc)
{
return (unsigned)wc <= 0x7f && ispunct(wc);
}
#include "unicode_wcwidth.c"
# if ENABLE_UNICODE_BIDI_SUPPORT
int FAST_FUNC unicode_isrtl(wint_t wc)
{
/* ranges taken from
* http://www.unicode.org/Public/5.2.0/ucd/extracted/DerivedBidiClass.txt
* Bidi_Class=Left_To_Right | Bidi_Class=Arabic_Letter
*/
static const struct interval rtl_b[] = {
# define BIG_(a,b) { a, b },
# define PAIR(a,b)
PAIR(0x0590, 0x0590)
PAIR(0x05BE, 0x05BE)
PAIR(0x05C0, 0x05C0)
PAIR(0x05C3, 0x05C3)
PAIR(0x05C6, 0x05C6)
BIG_(0x05C8, 0x05FF)
PAIR(0x0604, 0x0605)
PAIR(0x0608, 0x0608)
PAIR(0x060B, 0x060B)
PAIR(0x060D, 0x060D)
BIG_(0x061B, 0x064A)
PAIR(0x065F, 0x065F)
PAIR(0x066D, 0x066F)
BIG_(0x0671, 0x06D5)
PAIR(0x06E5, 0x06E6)
PAIR(0x06EE, 0x06EF)
BIG_(0x06FA, 0x070E)
PAIR(0x0710, 0x0710)
BIG_(0x0712, 0x072F)
BIG_(0x074B, 0x07A5)
BIG_(0x07B1, 0x07EA)
PAIR(0x07F4, 0x07F5)
BIG_(0x07FA, 0x0815)
PAIR(0x081A, 0x081A)
PAIR(0x0824, 0x0824)
PAIR(0x0828, 0x0828)
BIG_(0x082E, 0x08FF)
PAIR(0x200F, 0x200F)
PAIR(0x202B, 0x202B)
PAIR(0x202E, 0x202E)
BIG_(0xFB1D, 0xFB1D)
BIG_(0xFB1F, 0xFB28)
BIG_(0xFB2A, 0xFD3D)
BIG_(0xFD40, 0xFDCF)
BIG_(0xFDC8, 0xFDCF)
BIG_(0xFDF0, 0xFDFC)
BIG_(0xFDFE, 0xFDFF)
BIG_(0xFE70, 0xFEFE)
/* Probably not necessary
{0x10800, 0x1091E},
{0x10920, 0x10A00},
{0x10A04, 0x10A04},
{0x10A07, 0x10A0B},
{0x10A10, 0x10A37},
{0x10A3B, 0x10A3E},
{0x10A40, 0x10A7F},
{0x10B36, 0x10B38},
{0x10B40, 0x10E5F},
{0x10E7F, 0x10FFF},
{0x1E800, 0x1EFFF}
*/
# undef BIG_
# undef PAIR
};
static const uint16_t rtl_p[] = {
# define BIG_(a,b)
# define PAIR(a,b) (a << 2) | (b-a),
/* Exact copy-n-paste of the above: */
PAIR(0x0590, 0x0590)
PAIR(0x05BE, 0x05BE)
PAIR(0x05C0, 0x05C0)
PAIR(0x05C3, 0x05C3)
PAIR(0x05C6, 0x05C6)
BIG_(0x05C8, 0x05FF)
PAIR(0x0604, 0x0605)
PAIR(0x0608, 0x0608)
PAIR(0x060B, 0x060B)
PAIR(0x060D, 0x060D)
BIG_(0x061B, 0x064A)
PAIR(0x065F, 0x065F)
PAIR(0x066D, 0x066F)
BIG_(0x0671, 0x06D5)
PAIR(0x06E5, 0x06E6)
PAIR(0x06EE, 0x06EF)
BIG_(0x06FA, 0x070E)
PAIR(0x0710, 0x0710)
BIG_(0x0712, 0x072F)
BIG_(0x074B, 0x07A5)
BIG_(0x07B1, 0x07EA)
PAIR(0x07F4, 0x07F5)
BIG_(0x07FA, 0x0815)
PAIR(0x081A, 0x081A)
PAIR(0x0824, 0x0824)
PAIR(0x0828, 0x0828)
BIG_(0x082E, 0x08FF)
PAIR(0x200F, 0x200F)
PAIR(0x202B, 0x202B)
PAIR(0x202E, 0x202E)
BIG_(0xFB1D, 0xFB1D)
BIG_(0xFB1F, 0xFB28)
BIG_(0xFB2A, 0xFD3D)
BIG_(0xFD40, 0xFDCF)
BIG_(0xFDC8, 0xFDCF)
BIG_(0xFDF0, 0xFDFC)
BIG_(0xFDFE, 0xFDFF)
BIG_(0xFE70, 0xFEFE)
/* Probably not necessary
{0x10800, 0x1091E},
{0x10920, 0x10A00},
{0x10A04, 0x10A04},
{0x10A07, 0x10A0B},
{0x10A10, 0x10A37},
{0x10A3B, 0x10A3E},
{0x10A40, 0x10A7F},
{0x10B36, 0x10B38},
{0x10B40, 0x10E5F},
{0x10E7F, 0x10FFF},
{0x1E800, 0x1EFFF}
*/
# undef BIG_
# undef PAIR
};
if (in_interval_table(wc, rtl_b, ARRAY_SIZE(rtl_b) - 1))
return 1;
if (in_uint16_table(wc, rtl_p, ARRAY_SIZE(rtl_p) - 1))
return 1;
return 0;
}
# endif /* UNICODE_BIDI_SUPPORT */
#endif /* Homegrown Unicode support */
/* The rest is mostly same for libc and for "homegrown" support */
size_t FAST_FUNC unicode_strlen(const char *string)
{
size_t width = mbstowcs(NULL, string, INT_MAX);
if (width == (size_t)-1L)
return strlen(string);
return width;
}
static char* FAST_FUNC unicode_conv_to_printable2(uni_stat_t *stats, const char *src, unsigned width, int flags)
{
char *dst;
unsigned dst_len;
unsigned uni_count;
unsigned uni_width;
if (unicode_status != UNICODE_ON) {
char *d;
if (flags & UNI_FLAG_PAD) {
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';
} else {
d = dst = xstrndup(src, width);
while (*d) {
unsigned char c = *d;
if (c < ' ' || c >= 0x7f)
*d = '?';
d++;
}
}
if (stats)
stats->byte_count = stats->unicode_count = (d - dst);
return dst;
}
dst = NULL;
uni_count = uni_width = 0;
dst_len = 0;
while (1) {
int w;
wchar_t wc;
#if ENABLE_LOCALE_SUPPORT
{
mbstate_t mbst = { 0 };
ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst);
/* 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);
/* src is advanced to next mb char
* wc == ERROR_WCHAR: invalid sequence is seen
* else: wc is set
*/
if (wc == ERROR_WCHAR) /* error */
goto subst;
if (wc == 0) /* end-of-string */
break;
#endif
if (CONFIG_LAST_SUPPORTED_WCHAR && wc > CONFIG_LAST_SUPPORTED_WCHAR)
goto subst;
w = wcwidth(wc);
if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0) /* non-printable wchar */
|| (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
|| (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
) {
subst:
wc = CONFIG_SUBST_WCHAR;
w = 1;
}
width -= w;
/* 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;
break;
}
uni_count++;
uni_width += w;
dst = xrealloc(dst, dst_len + MB_CUR_MAX);
#if ENABLE_LOCALE_SUPPORT
{
mbstate_t mbst = { 0 };
dst_len += wcrtomb(&dst[dst_len], wc, &mbst);
}
#else
dst_len += wcrtomb_internal(&dst[dst_len], wc);
#endif
}
/* Pad to remaining width */
if (flags & UNI_FLAG_PAD) {
dst = xrealloc(dst, dst_len + width + 1);
uni_count += width;
uni_width += width;
while ((int)--width >= 0) {
dst[dst_len++] = ' ';
}
}
dst[dst_len] = '\0';
if (stats) {
stats->byte_count = dst_len;
stats->unicode_count = uni_count;
stats->unicode_width = uni_width;
}
return dst;
}
char* FAST_FUNC unicode_conv_to_printable(uni_stat_t *stats, const char *src)
{
return unicode_conv_to_printable2(stats, src, INT_MAX, 0);
}
char* FAST_FUNC unicode_conv_to_printable_maxwidth(uni_stat_t *stats, const char *src, unsigned maxwidth)
{
return unicode_conv_to_printable2(stats, src, maxwidth, 0);
}
char* FAST_FUNC unicode_conv_to_printable_fixedwidth(uni_stat_t *stats, const char *src, unsigned width)
{
return unicode_conv_to_printable2(stats, src, width, UNI_FLAG_PAD);
}
#ifdef UNUSED
unsigned FAST_FUNC unicode_padding_to_width(unsigned width, const char *src)
{
if (unicode_status != UNICODE_ON) {
return width - strnlen(src, width);
}
while (1) {
int w;
wchar_t wc;
#if ENABLE_LOCALE_SUPPORT
{
mbstate_t mbst = { 0 };
ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst);
if (rc <= 0) /* error, or end-of-string */
return width;
}
#else
src = mbstowc_internal(&wc, src);
if (wc == ERROR_WCHAR || wc == 0) /* error, or end-of-string */
return width;
#endif
w = wcwidth(wc);
if (w < 0) /* non-printable wchar */
return width;
width -= w;
if ((int)width <= 0) /* string is longer than width */
return 0;
}
}
#endif
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