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binutils-gdb/readline/mbutil.c
Patrick Palka 5836a818ec Revert "Sync readline/ to version 7.0 alpha"
This reverts commit b558ff043d.
This reverts commit 4a11f20659.

The initial import commit failed to retain local changes made to
readline's configure.in (and the commit message erroneously stated that
there were no local changes that needed to be reapplied).  Also the
import caused a couple of build errors and a scattering of testsuite
regressions throughout many arches.  It's probably better to start over
with this import, hopefully more carefully next time.
2015-07-25 15:57:00 -04:00

376 lines
8.8 KiB
C

/* mbutil.c -- readline multibyte character utility functions */
/* Copyright (C) 2001-2009 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
/* **************************************************************** */
/* */
/* Multibyte Character Utility Functions */
/* */
/* **************************************************************** */
#if defined(HANDLE_MULTIBYTE)
static int
_rl_find_next_mbchar_internal (string, seed, count, find_non_zero)
char *string;
int seed, count, 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 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;
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 int
_rl_find_prev_mbchar_internal (string, seed, find_non_zero)
char *string;
int seed, find_non_zero;
{
mbstate_t ps;
int prev, non_zero_prev, point, length;
size_t tmp;
wchar_t wc;
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)
{
tmp = mbrtowc (&wc, string + point, length - point, &ps);
if (MB_INVALIDCH ((size_t)tmp))
{
/* in this case, bytes are invalid or shorted 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 (src, ps)
char *src;
mbstate_t *ps;
{
size_t tmp;
tmp = mbrlen((const char *)src, (size_t)strlen (src), ps);
if (tmp == (size_t)(-2))
{
/* shorted 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 (buf1, pos1, ps1, buf2, pos2, ps2)
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 invalied (point < 0 || more than string length),
it returns -1 */
int
_rl_adjust_point(string, point, ps)
char *string;
int point;
mbstate_t *ps;
{
size_t tmp = 0;
int length;
int pos = 0;
length = strlen(string);
if (point < 0)
return -1;
if (length < point)
return -1;
while (pos < point)
{
tmp = mbrlen (string + pos, length - pos, ps);
if (MB_INVALIDCH ((size_t)tmp))
{
/* in this case, bytes are invalid or shorted 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 (string, seed, end, mbchar, length)
char *string;
int seed, 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 (buf, ind)
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]);
l = strlen (buf);
if (ind >= l - 1)
return ((wchar_t) 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 (string, seed, count, flags)
char *string;
int seed, count, 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 (string, seed, flags)
char *string;
int seed, flags;
{
#if defined (HANDLE_MULTIBYTE)
return _rl_find_prev_mbchar_internal (string, seed, flags);
#else
return ((seed == 0) ? seed : seed - 1);
#endif
}