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libbb/lineedit: add support for preserving "broken" (non-unicode) chars

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Signed-off-by: Tomas Heinrich <heinrich.tomas@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Tomas Heinrich 2010-04-29 13:43:39 +02:00 committed by Denys Vlasenko
parent 25b10d97e6
commit a659b81dfa
4 changed files with 89 additions and 20 deletions
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11
Config.in
View File

@ -223,6 +223,17 @@ config UNICODE_NEUTRAL_TABLE
With this option on, more extensive (and bigger) table
of neutral chars will be used.
config UNICODE_PRESERVE_BROKEN
bool "Make it possible to enter sequences of chars which are not Unicode"
default n
depends on UNICODE_SUPPORT
help
With this option on, invalid UTF-8 bytes are not substituted
with the selected substitution character.
For example, this means that entering 'l', 's', ' ', 0xff, [Enter]
at shell prompt will list file named 0xff (single char name
with char value 255), not file named '?'.
config LONG_OPTS
bool "Support for --long-options"
default y

62
libbb/lineedit.c
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@ -68,7 +68,7 @@
#undef CHAR_T
#if ENABLE_UNICODE_SUPPORT
# define BB_NUL L'\0'
# define BB_NUL ((wchar_t)0)
# define CHAR_T wchar_t
static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
# if ENABLE_FEATURE_EDITING_VI
@ -92,6 +92,14 @@ static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
#endif
# if ENABLE_UNICODE_PRESERVE_BROKEN
# define unicode_mark_inv_wchar(wc) ((wc) | 0x20000000)
# define unicode_is_inv_wchar(wc) ((wc) & 0x20000000)
# else
# define unicode_is_inv_wchar(wc) 0
# endif
enum {
/* We use int16_t for positions, need to limit line len */
MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
@ -208,24 +216,58 @@ static size_t load_string(const char *src, int maxsize)
ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
if (len < 0)
len = 0;
command_ps[len] = L'\0';
command_ps[len] = 0;
return len;
}
static size_t save_string(char *dst, int maxsize)
static unsigned save_string(char *dst, unsigned maxsize)
{
#if !ENABLE_UNICODE_PRESERVE_BROKEN
ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
if (len < 0)
len = 0;
dst[len] = '\0';
return len;
#else
unsigned dstpos = 0;
unsigned srcpos = 0;
maxsize--;
while (dstpos < maxsize) {
wchar_t wc;
int n = srcpos;
while ((wc = command_ps[srcpos]) != 0
&& !unicode_is_inv_wchar(wc)
) {
srcpos++;
}
command_ps[srcpos] = 0;
n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
if (n < 0) /* should not happen */
break;
dstpos += n;
if (wc == 0) /* usually is */
break;
/* We do have invalid byte here! */
command_ps[srcpos] = wc; /* restore it */
srcpos++;
if (dstpos == maxsize)
break;
dst[dstpos++] = (char) wc;
}
dst[dstpos] = '\0';
return dstpos;
#endif
}
/* I thought just fputwc(c, stdout) would work. But no... */
static void BB_PUTCHAR(wchar_t c)
{
char buf[MB_CUR_MAX + 1];
mbstate_t mbst = { 0 };
ssize_t len = wcrtomb(buf, c, &mbst);
ssize_t len;
if (unicode_is_inv_wchar(c))
c = CONFIG_SUBST_WCHAR;
len = wcrtomb(buf, c, &mbst);
if (len > 0) {
buf[len] = '\0';
fputs(buf, stdout);
@ -238,7 +280,7 @@ static size_t load_string(const char *src, int maxsize)
return strlen(command_ps);
}
# if ENABLE_FEATURE_TAB_COMPLETION
static void save_string(char *dst, int maxsize)
static void save_string(char *dst, unsigned maxsize)
{
safe_strncpy(dst, command_ps, maxsize);
}
@ -1719,13 +1761,11 @@ static int lineedit_read_key(char *read_key_buffer)
pushback:
/* Invalid sequence. Save all "bad bytes" except first */
read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
/*
* ic = unicode_buf[0] sounds even better, but currently
* this does not work: wchar_t[] -> char[] conversion
* when lineedit finishes mangles such "raw bytes"
* (by misinterpreting them as unicode chars):
*/
# if !ENABLE_UNICODE_PRESERVE_BROKEN
ic = CONFIG_SUBST_WCHAR;
# else
ic = unicode_mark_inv_wchar(unicode_buf[0]);
# endif
} else {
/* Valid unicode char, return its code */
ic = wc;

12
libbb/unicode.c
View File

@ -423,7 +423,6 @@ static int wcwidth(unsigned ucs)
# if LAST_SUPPORTED_WCHAR >= 0x300
/* 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[] = {
# define BIG_(a,b) { a, b },
# define PAIR(a,b)
# define ARRAY /* PAIR if < 0x4000 and no more than 4 chars big */ \
@ -557,10 +556,9 @@ static int wcwidth(unsigned ucs)
BIG_(0xFE20, 0xFE23) \
BIG_(0xFEFF, 0xFEFF) \
BIG_(0xFFF9, 0xFFFB)
ARRAY
static const struct interval combining[] = { ARRAY };
# undef BIG_
# undef PAIR
};
# define BIG_(a,b)
# define PAIR(a,b) (a << 2) | (b-a),
static const uint16_t combining1[] = { ARRAY };
@ -668,7 +666,6 @@ int FAST_FUNC unicode_bidi_isrtl(wint_t wc)
* 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)
# define ARRAY \
@ -723,10 +720,9 @@ int FAST_FUNC unicode_bidi_isrtl(wint_t wc)
{0x10E7F, 0x10FFF},
{0x1E800, 0x1EFFF}
*/
ARRAY
static const struct interval rtl_b[] = { ARRAY };
# undef BIG_
# undef PAIR
};
# define BIG_(a,b)
# define PAIR(a,b) (a << 2) | (b-a),
static const uint16_t rtl_p[] = { ARRAY };
@ -755,7 +751,6 @@ int FAST_FUNC unicode_bidi_is_neutral_wchar(wint_t wc)
* White_Space, Other_Neutral, European_Number, European_Separator,
* European_Terminator, Arabic_Number, Common_Separator
*/
static const struct interval neutral_b[] = {
# define BIG_(a,b) { a, b },
# define PAIR(a,b)
# define ARRAY \
@ -929,10 +924,9 @@ int FAST_FUNC unicode_bidi_is_neutral_wchar(wint_t wc)
{0x1F030, 0x1F093},
{0x1F100, 0x1F10A}
*/
ARRAY
static const struct interval neutral_b[] = { ARRAY };
# undef BIG_
# undef PAIR
};
# define BIG_(a,b)
# define PAIR(a,b) (a << 2) | (b-a),
static const uint16_t neutral_p[] = { ARRAY };

24
testsuite/ash.tests
View File

@ -7,8 +7,30 @@
. ./testing.sh
test -f "$bindir/.config" && . "$bindir/.config"
# testing "test name" "options" "expected result" "file input" "stdin"
if test x"$CONFIG_UNICODE_PRESERVE_BROKEN" = x"y"; then
testing "One byte which is not valid unicode char followed by valid input" \
"script -q -c 'ash' /dev/null >/dev/null; cat ash.output" \
"\
00000000 ff 2d 0a |.-.|
00000003
" \
"" \
"echo \xff- | hexdump -C >ash.output; exit; exit; exit; exit\n"
testing "30 bytes which are not valid unicode chars followed by valid input" \
"script -q -c 'ash' /dev/null >/dev/null; cat ash.output" \
"\
00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff 2d 0a |..............-.|
00000020
" \
"" \
"echo \xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff- | hexdump -C >ash.output; exit; exit; exit; exit\n"
else
testing "One byte which is not valid unicode char followed by valid input" \
"script -q -c 'ash' /dev/null >/dev/null; cat ash.output" \
"\
@ -27,6 +49,8 @@ testing "30 bytes which are not valid unicode chars followed by valid input" \
" \
"" \
"echo \xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff- | hexdump -C >ash.output; exit; exit; exit; exit\n"
fi
# Not sure this behavior is perfect: we lose all invalid input which precedes
# arrow keys and such. In this example, \xff\xff are lost