338 lines
8.2 KiB
C
338 lines
8.2 KiB
C
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/* mbutil.c -- readline multibyte character utility functions */
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <fcntl.h>
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#include "posixjmp.h"
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h> /* for _POSIX_VERSION */
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#include <stdio.h>
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#include <ctype.h>
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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#include "rlmbutil.h"
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#if defined (TIOCSTAT_IN_SYS_IOCTL)
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# include <sys/ioctl.h>
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#endif /* TIOCSTAT_IN_SYS_IOCTL */
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/* Some standard library routines. */
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#include "readline.h"
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#include "rlprivate.h"
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#include "xmalloc.h"
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/* Declared here so it can be shared between the readline and history
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libraries. */
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#if defined (HANDLE_MULTIBYTE)
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int rl_byte_oriented = 0;
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#else
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int rl_byte_oriented = 1;
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#endif
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/* **************************************************************** */
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/* */
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/* Multibyte Character Utility Functions */
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/* */
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/* **************************************************************** */
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#if defined(HANDLE_MULTIBYTE)
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static int
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_rl_find_next_mbchar_internal (string, seed, count, find_non_zero)
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char *string;
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int seed, count, find_non_zero;
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{
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size_t tmp = 0;
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mbstate_t ps;
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int point = 0;
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wchar_t wc;
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memset(&ps, 0, sizeof (mbstate_t));
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if (seed < 0)
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seed = 0;
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if (count <= 0)
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return seed;
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point = seed + _rl_adjust_point(string, seed, &ps);
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/* if this is true, means that seed was not pointed character
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started byte. So correct the point and consume count */
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if (seed < point)
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count --;
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while (count > 0)
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{
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tmp = mbrtowc (&wc, string+point, strlen(string + point), &ps);
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if ((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2)
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{
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/* invalid bytes. asume a byte represents a character */
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point++;
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count--;
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/* reset states. */
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memset(&ps, 0, sizeof(mbstate_t));
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}
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else if (tmp == (size_t)0)
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/* found '\0' char */
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break;
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else
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{
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/* valid bytes */
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point += tmp;
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if (find_non_zero)
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{
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if (wcwidth (wc) == 0)
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continue;
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else
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count--;
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}
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else
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count--;
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}
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}
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if (find_non_zero)
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{
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tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps);
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while (wcwidth (wc) == 0)
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{
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point += tmp;
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tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps);
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if (tmp == (size_t)(0) || tmp == (size_t)(-1) || tmp == (size_t)(-2))
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break;
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}
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}
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return point;
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}
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static int
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_rl_find_prev_mbchar_internal (string, seed, find_non_zero)
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char *string;
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int seed, find_non_zero;
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{
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mbstate_t ps;
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int prev, non_zero_prev, point, length;
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size_t tmp;
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wchar_t wc;
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memset(&ps, 0, sizeof(mbstate_t));
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length = strlen(string);
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if (seed < 0)
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return 0;
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else if (length < seed)
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return length;
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prev = non_zero_prev = point = 0;
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while (point < seed)
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{
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tmp = mbrtowc (&wc, string + point, length - point, &ps);
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if ((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2)
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{
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/* in this case, bytes are invalid or shorted to compose
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multibyte char, so assume that the first byte represents
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a single character anyway. */
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tmp = 1;
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/* clear the state of the byte sequence, because
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in this case effect of mbstate is undefined */
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memset(&ps, 0, sizeof (mbstate_t));
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}
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else if (tmp == 0)
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break; /* Found '\0' char. Can this happen? */
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else
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{
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if (find_non_zero)
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{
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if (wcwidth (wc) != 0)
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prev = point;
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}
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else
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prev = point;
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}
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point += tmp;
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}
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return prev;
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}
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/* return the number of bytes parsed from the multibyte sequence starting
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at src, if a non-L'\0' wide character was recognized. It returns 0,
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if a L'\0' wide character was recognized. It returns (size_t)(-1),
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if an invalid multibyte sequence was encountered. It returns (size_t)(-2)
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if it couldn't parse a complete multibyte character. */
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int
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_rl_get_char_len (src, ps)
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char *src;
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mbstate_t *ps;
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{
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size_t tmp;
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tmp = mbrlen((const char *)src, (size_t)strlen (src), ps);
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if (tmp == (size_t)(-2))
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{
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/* shorted to compose multibyte char */
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memset (ps, 0, sizeof(mbstate_t));
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return -2;
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}
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else if (tmp == (size_t)(-1))
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{
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/* invalid to compose multibyte char */
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/* initialize the conversion state */
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memset (ps, 0, sizeof(mbstate_t));
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return -1;
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}
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else if (tmp == (size_t)0)
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return 0;
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else
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return (int)tmp;
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}
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/* compare the specified two characters. If the characters matched,
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return 1. Otherwise return 0. */
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int
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_rl_compare_chars (buf1, pos1, ps1, buf2, pos2, ps2)
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char *buf1, *buf2;
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mbstate_t *ps1, *ps2;
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int pos1, pos2;
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{
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int i, w1, w2;
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if ((w1 = _rl_get_char_len (&buf1[pos1], ps1)) <= 0 ||
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(w2 = _rl_get_char_len (&buf2[pos2], ps2)) <= 0 ||
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(w1 != w2) ||
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(buf1[pos1] != buf2[pos2]))
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return 0;
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for (i = 1; i < w1; i++)
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if (buf1[pos1+i] != buf2[pos2+i])
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return 0;
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return 1;
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}
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/* adjust pointed byte and find mbstate of the point of string.
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adjusted point will be point <= adjusted_point, and returns
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differences of the byte(adjusted_point - point).
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if point is invalied (point < 0 || more than string length),
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it returns -1 */
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int
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_rl_adjust_point(string, point, ps)
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char *string;
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int point;
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mbstate_t *ps;
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{
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size_t tmp = 0;
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int length;
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int pos = 0;
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length = strlen(string);
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if (point < 0)
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return -1;
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if (length < point)
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return -1;
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while (pos < point)
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{
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tmp = mbrlen (string + pos, length - pos, ps);
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if((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2)
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{
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/* in this case, bytes are invalid or shorted to compose
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multibyte char, so assume that the first byte represents
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a single character anyway. */
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pos++;
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/* clear the state of the byte sequence, because
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in this case effect of mbstate is undefined */
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memset (ps, 0, sizeof (mbstate_t));
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}
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else
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pos += tmp;
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}
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return (pos - point);
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}
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int
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_rl_is_mbchar_matched (string, seed, end, mbchar, length)
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char *string;
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int seed, end;
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char *mbchar;
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int length;
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{
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int i;
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if ((end - seed) < length)
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return 0;
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for (i = 0; i < length; i++)
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if (string[seed + i] != mbchar[i])
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return 0;
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return 1;
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}
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#endif /* HANDLE_MULTIBYTE */
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/* Find next `count' characters started byte point of the specified seed.
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If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte
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characters. */
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#undef _rl_find_next_mbchar
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int
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_rl_find_next_mbchar (string, seed, count, flags)
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char *string;
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int seed, count, flags;
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{
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#if defined (HANDLE_MULTIBYTE)
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return _rl_find_next_mbchar_internal (string, seed, count, flags);
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#else
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return (seed + count);
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#endif
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}
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/* Find previous character started byte point of the specified seed.
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Returned point will be point <= seed. If flags is MB_FIND_NONZERO,
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we look for non-zero-width multibyte characters. */
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#undef _rl_find_prev_mbchar
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int
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_rl_find_prev_mbchar (string, seed, flags)
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char *string;
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int seed, flags;
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{
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#if defined (HANDLE_MULTIBYTE)
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return _rl_find_prev_mbchar_internal (string, seed, flags);
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#else
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return ((seed == 0) ? seed : seed - 1);
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#endif
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}
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