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/* mbutil.c -- readline multibyte character utility functions */
/* Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of the GNU Readline Library (Readline), a library
for reading lines of text with interactive input and history editing.
Readline is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Readline is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Readline. If not, see <http://www.gnu.org/licenses/>.
*/
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#include <sys/types.h>
#include <fcntl.h>
#include "posixjmp.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h> /* for _POSIX_VERSION */
#endif /* HAVE_UNISTD_H */
#if defined (HAVE_STDLIB_H)
# include <stdlib.h>
#else
# include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */
#include <stdio.h>
#include <ctype.h>
/* System-specific feature definitions and include files. */
#include "rldefs.h"
#include "rlmbutil.h"
#if defined (TIOCSTAT_IN_SYS_IOCTL)
# include <sys/ioctl.h>
#endif /* TIOCSTAT_IN_SYS_IOCTL */
/* Some standard library routines. */
#include "readline.h"
#include "rlprivate.h"
#include "xmalloc.h"
/* Declared here so it can be shared between the readline and history
libraries. */
#if defined (HANDLE_MULTIBYTE)
int rl_byte_oriented = 0;
#else
int rl_byte_oriented = 1;
#endif
/* Ditto */
int _rl_utf8locale = 0;
/* **************************************************************** */
/* */
/* Multibyte Character Utility Functions */
/* */
/* **************************************************************** */
#if defined(HANDLE_MULTIBYTE)
/* **************************************************************** */
/* */
/* UTF-8 specific Character Utility Functions */
/* */
/* **************************************************************** */
/* Return the length in bytes of the possibly-multibyte character beginning
at S. Encoding is UTF-8. */
static int
_rl_utf8_mblen (const char *s, size_t n)
{
unsigned char c, c1, c2, c3;
if (s == 0)
return (0); /* no shift states */
if (n <= 0)
return (-1);
c = (unsigned char)*s;
if (c < 0x80)
return (c != 0);
if (c >= 0xc2)
{
c1 = (unsigned char)s[1];
if (c < 0xe0)
{
if (n == 1)
return -2;
if (n >= 2 && (c1 ^ 0x80) < 0x40)
return 2;
}
else if (c < 0xf0)
{
if (n == 1)
return -2;
if ((c1 ^ 0x80) < 0x40
&& (c >= 0xe1 || c1 >= 0xa0)
&& (c != 0xed || c1 < 0xa0))
{
if (n == 2)
return -2;
c2 = (unsigned char)s[2];
if ((c2 ^ 0x80) < 0x40)
return 3;
}
}
else if (c < 0xf4)
{
if (n == 1)
return -2;
if (((c1 ^ 0x80) < 0x40)
&& (c >= 0xf1 || c1 >= 0x90)
&& (c < 0xf4 || (c == 0xf4 && c1 < 0x90)))
{
if (n == 2)
return -2;
c2 = (unsigned char)s[2];
if ((c2 ^ 0x80) < 0x40)
{
if (n == 3)
return -2;
c3 = (unsigned char)s[3];
if ((c3 ^ 0x80) < 0x40)
return 4;
}
}
}
}
/* invalid or incomplete multibyte character */
return -1;
}
static int
_rl_find_next_mbchar_internal (char *string, int seed, int count, int find_non_zero)
{
size_t tmp, len;
mbstate_t ps;
int point;
WCHAR_T wc;
tmp = 0;
memset(&ps, 0, sizeof (mbstate_t));
if (seed < 0)
seed = 0;
if (count <= 0)
return seed;
point = seed + _rl_adjust_point (string, seed, &ps);
/* if _rl_adjust_point returns -1, the character or string is invalid.
treat as a byte. */
if (point == seed - 1) /* invalid */
return seed + 1;
/* if this is true, means that seed was not pointing to a byte indicating
the beginning of a multibyte character. Correct the point and consume
one char. */
if (seed < point)
count--;
while (count > 0)
{
len = strlen (string + point);
if (len == 0)
break;
if (_rl_utf8locale && UTF8_SINGLEBYTE(string[point]))
{
tmp = 1;
wc = (WCHAR_T) string[point];
memset(&ps, 0, sizeof(mbstate_t));
}
else
tmp = MBRTOWC (&wc, string+point, len, &ps);
if (MB_INVALIDCH ((size_t)tmp))
{
/* invalid bytes. assume a byte represents a character */
point++;
count--;
/* reset states. */
memset(&ps, 0, sizeof(mbstate_t));
}
else if (MB_NULLWCH (tmp))
break; /* found wide '\0' */
else
{
/* valid bytes */
point += tmp;
if (find_non_zero)
{
if (WCWIDTH (wc) == 0)
continue;
else
count--;
}
else
count--;
}
}
if (find_non_zero)
{
tmp = MBRTOWC (&wc, string + point, strlen (string + point), &ps);
while (MB_NULLWCH (tmp) == 0 && MB_INVALIDCH (tmp) == 0 && WCWIDTH (wc) == 0)
{
point += tmp;
tmp = MBRTOWC (&wc, string + point, strlen (string + point), &ps);
}
}
return point;
}
static inline int
_rl_test_nonzero (char *string, int ind, int len)
{
size_t tmp;
WCHAR_T wc;
mbstate_t ps;
memset (&ps, 0, sizeof (mbstate_t));
tmp = MBRTOWC (&wc, string + ind, len - ind, &ps);
/* treat invalid multibyte sequences as non-zero-width */
return (MB_INVALIDCH (tmp) || MB_NULLWCH (tmp) || WCWIDTH (wc) > 0);
}
/* experimental -- needs to handle zero-width characters better */
static int
_rl_find_prev_utf8char (char *string, int seed, int find_non_zero)
{
char *s;
unsigned char b;
int save, prev;
size_t len;
if (find_non_zero)
len = RL_STRLEN (string);
prev = seed - 1;
while (prev >= 0)
{
b = (unsigned char)string[prev];
if (UTF8_SINGLEBYTE (b))
return (prev);
save = prev;
/* Move back until we're not in the middle of a multibyte char */
if (UTF8_MBCHAR (b))
{
while (prev > 0 && (b = (unsigned char)string[--prev]) && UTF8_MBCHAR (b))
;
}
if (UTF8_MBFIRSTCHAR (b))
{
if (find_non_zero)
{
if (_rl_test_nonzero (string, prev, len))
return (prev);
else /* valid but WCWIDTH (wc) == 0 */
prev = prev - 1;
}
else
return (prev);
}
else
return (save); /* invalid utf-8 multibyte sequence */
}
return ((prev < 0) ? 0 : prev);
}
/*static*/ int
_rl_find_prev_mbchar_internal (char *string, int seed, int find_non_zero)
{
mbstate_t ps;
int prev, non_zero_prev, point, length;
size_t tmp;
WCHAR_T wc;
if (_rl_utf8locale)
return (_rl_find_prev_utf8char (string, seed, find_non_zero));
memset(&ps, 0, sizeof(mbstate_t));
length = strlen(string);
if (seed < 0)
return 0;
else if (length < seed)
return length;
prev = non_zero_prev = point = 0;
while (point < seed)
{
if (_rl_utf8locale && UTF8_SINGLEBYTE(string[point]))
{
tmp = 1;
wc = (WCHAR_T) string[point];
memset(&ps, 0, sizeof(mbstate_t));
}
else
tmp = MBRTOWC (&wc, string + point, length - point, &ps);
if (MB_INVALIDCH ((size_t)tmp))
{
/* in this case, bytes are invalid or too short to compose
multibyte char, so assume that the first byte represents
a single character anyway. */
tmp = 1;
/* clear the state of the byte sequence, because
in this case effect of mbstate is undefined */
memset(&ps, 0, sizeof (mbstate_t));
/* Since we're assuming that this byte represents a single
non-zero-width character, don't forget about it. */
prev = point;
}
else if (MB_NULLWCH (tmp))
break; /* Found '\0' char. Can this happen? */
else
{
if (find_non_zero)
{
if (WCWIDTH (wc) != 0)
prev = point;
}
else
prev = point;
}
point += tmp;
}
return prev;
}
/* return the number of bytes parsed from the multibyte sequence starting
at src, if a non-L'\0' wide character was recognized. It returns 0,
if a L'\0' wide character was recognized. It returns (size_t)(-1),
if an invalid multibyte sequence was encountered. It returns (size_t)(-2)
if it couldn't parse a complete multibyte character. */
int
_rl_get_char_len (char *src, mbstate_t *ps)
{
size_t tmp, l;
int mb_cur_max;
/* Look at no more than MB_CUR_MAX characters */
l = (size_t)strlen (src);
if (_rl_utf8locale && l > 0 && UTF8_SINGLEBYTE(*src))
tmp = (*src != 0) ? 1 : 0;
else
{
mb_cur_max = MB_CUR_MAX;
tmp = mbrlen((const char *)src, (l < mb_cur_max) ? l : mb_cur_max, ps);
}
if (tmp == (size_t)(-2))
{
/* too short to compose multibyte char */
if (ps)
memset (ps, 0, sizeof(mbstate_t));
return -2;
}
else if (tmp == (size_t)(-1))
{
/* invalid to compose multibyte char */
/* initialize the conversion state */
if (ps)
memset (ps, 0, sizeof(mbstate_t));
return -1;
}
else if (tmp == (size_t)0)
return 0;
else
return (int)tmp;
}
/* compare the specified two characters. If the characters matched,
return 1. Otherwise return 0. */
int
_rl_compare_chars (char *buf1, int pos1, mbstate_t *ps1, char *buf2, int pos2, mbstate_t *ps2)
{
int i, w1, w2;
if ((w1 = _rl_get_char_len (&buf1[pos1], ps1)) <= 0 ||
(w2 = _rl_get_char_len (&buf2[pos2], ps2)) <= 0 ||
(w1 != w2) ||
(buf1[pos1] != buf2[pos2]))
return 0;
for (i = 1; i < w1; i++)
if (buf1[pos1+i] != buf2[pos2+i])
return 0;
return 1;
}
/* adjust pointed byte and find mbstate of the point of string.
adjusted point will be point <= adjusted_point, and returns
differences of the byte(adjusted_point - point).
if point is invalid (point < 0 || more than string length),
it returns -1 */
int
_rl_adjust_point (char *string, int point, mbstate_t *ps)
{
size_t tmp;
int length, pos;
tmp = 0;
pos = 0;
length = strlen(string);
if (point < 0)
return -1;
if (length < point)
return -1;
while (pos < point)
{
if (_rl_utf8locale && UTF8_SINGLEBYTE(string[pos]))
tmp = 1;
else
tmp = mbrlen (string + pos, length - pos, ps);
if (MB_INVALIDCH ((size_t)tmp))
{
/* in this case, bytes are invalid or too short to compose
multibyte char, so assume that the first byte represents
a single character anyway. */
pos++;
/* clear the state of the byte sequence, because
in this case effect of mbstate is undefined */
if (ps)
memset (ps, 0, sizeof (mbstate_t));
}
else if (MB_NULLWCH (tmp))
pos++;
else
pos += tmp;
}
return (pos - point);
}
int
_rl_is_mbchar_matched (char *string, int seed, int end, char *mbchar, int length)
{
int i;
if ((end - seed) < length)
return 0;
for (i = 0; i < length; i++)
if (string[seed + i] != mbchar[i])
return 0;
return 1;
}
WCHAR_T
_rl_char_value (char *buf, int ind)
{
size_t tmp;
WCHAR_T wc;
mbstate_t ps;
int l;
if (MB_LEN_MAX == 1 || rl_byte_oriented)
return ((WCHAR_T) buf[ind]);
if (_rl_utf8locale && UTF8_SINGLEBYTE(buf[ind]))
return ((WCHAR_T) buf[ind]);
l = strlen (buf);
if (ind >= l - 1)
return ((WCHAR_T) buf[ind]);
if (l < ind) /* Sanity check */
l = strlen (buf+ind);
memset (&ps, 0, sizeof (mbstate_t));
tmp = MBRTOWC (&wc, buf + ind, l - ind, &ps);
if (MB_INVALIDCH (tmp) || MB_NULLWCH (tmp))
return ((WCHAR_T) buf[ind]);
return wc;
}
#endif /* HANDLE_MULTIBYTE */
/* Find next `count' characters started byte point of the specified seed.
If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte
characters. */
#undef _rl_find_next_mbchar
int
_rl_find_next_mbchar (char *string, int seed, int count, int flags)
{
#if defined (HANDLE_MULTIBYTE)
return _rl_find_next_mbchar_internal (string, seed, count, flags);
#else
return (seed + count);
#endif
}
/* Find previous character started byte point of the specified seed.
Returned point will be point <= seed. If flags is MB_FIND_NONZERO,
we look for non-zero-width multibyte characters. */
#undef _rl_find_prev_mbchar
int
_rl_find_prev_mbchar (char *string, int seed, int flags)
{
#if defined (HANDLE_MULTIBYTE)
return _rl_find_prev_mbchar_internal (string, seed, flags);
#else
return ((seed == 0) ? seed : seed - 1);
#endif
}
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