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-rw-r--r--lib/readline/mbutil.c524
1 files changed, 524 insertions, 0 deletions
diff --git a/lib/readline/mbutil.c b/lib/readline/mbutil.c
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--- /dev/null
+++ b/lib/readline/mbutil.c
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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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