foxiepaws
/
weechat
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
weechat/src/core/wee-utf8.c

780 lines
19 KiB
C
Raw Permalink Blame History

/*
* wee-utf8.c - UTF-8 string functions
*
* Copyright (C) 2003-2020 Sébastien Helleu <flashcode@flashtux.org>
* Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
*
* This file is part of WeeChat, the extensible chat client.
*
* WeeChat 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.
*
* WeeChat 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 WeeChat. If not, see <https://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <wctype.h>
#include "weechat.h"
#include "wee-utf8.h"
#include "wee-config.h"
#include "wee-string.h"
int local_utf8 = 0;
/*
* Initializes UTF-8 in WeeChat.
*/
void
utf8_init ()
{
local_utf8 = (string_strcasecmp (weechat_local_charset, "UTF-8") == 0);
}
/*
* Checks if a string has some 8-bit chars.
*
* Returns:
* 1: string has 8-bit chars
* 0: string has only 7-bit chars
*/
int
utf8_has_8bits (const char *string)
{
while (string && string[0])
{
if (string[0] & 0x80)
return 1;
string++;
}
return 0;
}
/*
* Checks if a string is UTF-8 valid.
*
* If length is <= 0, checks whole string.
* If length is > 0, checks only this number of chars (not bytes).
*
* Returns:
* 1: string is UTF-8 valid
* 0: string it not UTF-8 valid, and then if error is not NULL, it is set
* with first non valid UTF-8 char in string
*/
int
utf8_is_valid (const char *string, int length, char **error)
{
int code_point, current_char;
current_char = 0;
while (string && string[0]
&& ((length <= 0) || (current_char < length)))
{
/*
* UTF-8, 2 bytes, should be: 110vvvvv 10vvvvvv
* and in range: U+0080 - U+07FF
*/
if (((unsigned char)(string[0]) & 0xE0) == 0xC0)
{
if (!string[1] || (((unsigned char)(string[1]) & 0xC0) != 0x80))
goto invalid;
code_point = utf8_char_int (string);
if ((code_point < 0x0080) || (code_point > 0x07FF))
goto invalid;
string += 2;
}
/*
* UTF-8, 3 bytes, should be: 1110vvvv 10vvvvvv 10vvvvvv
* and in range: U+0800 - U+FFFF
* (note: high and low surrogate halves used by UTF-16 (U+D800 through
* U+DFFF) are not legal Unicode values)
*/
else if (((unsigned char)(string[0]) & 0xF0) == 0xE0)
{
if (!string[1] || !string[2]
|| (((unsigned char)(string[1]) & 0xC0) != 0x80)
|| (((unsigned char)(string[2]) & 0xC0) != 0x80))
{
goto invalid;
}
code_point = utf8_char_int (string);
if ((code_point < 0x0800)
|| (code_point > 0xFFFF)
|| ((code_point >= 0xD800) && (code_point <= 0xDFFF)))
{
goto invalid;
}
string += 3;
}
/*
* UTF-8, 4 bytes, should be: 11110vvv 10vvvvvv 10vvvvvv 10vvvvvv
* and in range: U+10000 - U+1FFFFF
*/
else if (((unsigned char)(string[0]) & 0xF8) == 0xF0)
{
if (!string[1] || !string[2] || !string[3]
|| (((unsigned char)(string[1]) & 0xC0) != 0x80)
|| (((unsigned char)(string[2]) & 0xC0) != 0x80)
|| (((unsigned char)(string[3]) & 0xC0) != 0x80))
{
goto invalid;
}
code_point = utf8_char_int (string);
if ((code_point < 0x10000) || (code_point > 0x1FFFFF))
goto invalid;
string += 4;
}
/* UTF-8, 1 byte, should be: 0vvvvvvv */
else if ((unsigned char)(string[0]) >= 0x80)
goto invalid;
else
string++;
current_char++;
}
if (error)
*error = NULL;
return 1;
invalid:
if (error)
*error = (char *)string;
return 0;
}
/*
* Normalizes an string: removes non UTF-8 chars and replaces them by a
* "replacement" char.
*/
void
utf8_normalize (char *string, char replacement)
{
char *error;
while (string && string[0])
{
if (utf8_is_valid (string, -1, &error))
return;
error[0] = replacement;
string = error + 1;
}
}
/*
* Gets pointer to previous UTF-8 char in a string.
*
* Returns pointer to previous UTF-8 char, NULL if not found (for example
* "string_start" was reached).
*/
const char *
utf8_prev_char (const char *string_start, const char *string)
{
if (!string || (string <= string_start))
return NULL;
string--;
if (((unsigned char)(string[0]) & 0xC0) == 0x80)
{
/* UTF-8, at least 2 bytes */
string--;
if (string < string_start)
return (char *)string + 1;
if (((unsigned char)(string[0]) & 0xC0) == 0x80)
{
/* UTF-8, at least 3 bytes */
string--;
if (string < string_start)
return (char *)string + 1;
if (((unsigned char)(string[0]) & 0xC0) == 0x80)
{
/* UTF-8, 4 bytes */
string--;
if (string < string_start)
return (char *)string + 1;
return (char *)string;
}
else
return (char *)string;
}
else
return (char *)string;
}
return (char *)string;
}
/*
* Gets pointer to next UTF-8 char in a string.
*
* Returns pointer to next UTF-8 char, NULL if string was NULL.
*/
const char *
utf8_next_char (const char *string)
{
if (!string)
return NULL;
/* UTF-8, 2 bytes: 110vvvvv 10vvvvvv */
if (((unsigned char)(string[0]) & 0xE0) == 0xC0)
{
if (!string[1])
return (char *)string + 1;
return (char *)string + 2;
}
/* UTF-8, 3 bytes: 1110vvvv 10vvvvvv 10vvvvvv */
else if (((unsigned char)(string[0]) & 0xF0) == 0xE0)
{
if (!string[1])
return (char *)string + 1;
if (!string[2])
return (char *)string + 2;
return (char *)string + 3;
}
/* UTF-8, 4 bytes: 11110vvv 10vvvvvv 10vvvvvv 10vvvvvv */
else if (((unsigned char)(string[0]) & 0xF8) == 0xF0)
{
if (!string[1])
return (char *)string + 1;
if (!string[2])
return (char *)string + 2;
if (!string[3])
return (char *)string + 3;
return (char *)string + 4;
}
/* UTF-8, 1 byte: 0vvvvvvv */
return (char *)string + 1;
}
/*
* Gets UTF-8 char as an integer.
*
* Returns the UTF-8 char as integer number.
*/
int
utf8_char_int (const char *string)
{
const unsigned char *ptr_string;
if (!string)
return 0;
ptr_string = (unsigned char *)string;
/* UTF-8, 2 bytes: 110vvvvv 10vvvvvv */
if ((ptr_string[0] & 0xE0) == 0xC0)
{
if (!ptr_string[1])
return (int)(ptr_string[0] & 0x1F);
return ((int)(ptr_string[0] & 0x1F) << 6) +
((int)(ptr_string[1] & 0x3F));
}
/* UTF-8, 3 bytes: 1110vvvv 10vvvvvv 10vvvvvv */
else if ((ptr_string[0] & 0xF0) == 0xE0)
{
if (!ptr_string[1])
return (int)(ptr_string[0] & 0x0F);
if (!ptr_string[2])
return (((int)(ptr_string[0] & 0x0F)) << 6) +
((int)(ptr_string[1] & 0x3F));
return (((int)(ptr_string[0] & 0x0F)) << 12) +
(((int)(ptr_string[1] & 0x3F)) << 6) +
((int)(ptr_string[2] & 0x3F));
}
/* UTF-8, 4 bytes: 11110vvv 10vvvvvv 10vvvvvv 10vvvvvv */
else if ((ptr_string[0] & 0xF8) == 0xF0)
{
if (!ptr_string[1])
return (int)(ptr_string[0] & 0x07);
if (!ptr_string[2])
return (((int)(ptr_string[0] & 0x07)) << 6) +
((int)(ptr_string[1] & 0x3F));
if (!ptr_string[3])
return (((int)(ptr_string[0] & 0x07)) << 12) +
(((int)(ptr_string[1] & 0x3F)) << 6) +
((int)(ptr_string[2] & 0x3F));
return (((int)(ptr_string[0] & 0x07)) << 18) +
(((int)(ptr_string[1] & 0x3F)) << 12) +
(((int)(ptr_string[2] & 0x3F)) << 6) +
((int)(ptr_string[3] & 0x3F));
}
/* UTF-8, 1 byte: 0vvvvvvv */
return (int)ptr_string[0];
}
/*
* Converts a unicode char (as unsigned integer) to a string.
*
* The string must have a size >= 5
* (4 bytes for the UTF-8 char + the final '\0').
*
* In case of error (if unicode value is > 0x1FFFFF), the string is set to an
* empty string (string[0] == '\0').
*/
void
utf8_int_string (unsigned int unicode_value, char *string)
{
if (!string)
return;
string[0] = '\0';
if (unicode_value <= 0x007F)
{
/* UTF-8, 1 byte: 0vvvvvvv */
string[0] = unicode_value;
string[1] = '\0';
}
else if (unicode_value <= 0x07FF)
{
/* UTF-8, 2 bytes: 110vvvvv 10vvvvvv */
string[0] = 0xC0 | ((unicode_value >> 6) & 0x1F);
string[1] = 0x80 | (unicode_value & 0x3F);
string[2] = '\0';
}
else if (unicode_value <= 0xFFFF)
{
/* UTF-8, 3 bytes: 1110vvvv 10vvvvvv 10vvvvvv */
string[0] = 0xE0 | ((unicode_value >> 12) & 0x0F);
string[1] = 0x80 | ((unicode_value >> 6) & 0x3F);
string[2] = 0x80 | (unicode_value & 0x3F);
string[3] = '\0';
}
else if (unicode_value <= 0x1FFFFF)
{
/* UTF-8, 4 bytes: 11110vvv 10vvvvvv 10vvvvvv 10vvvvvv */
string[0] = 0xF0 | ((unicode_value >> 18) & 0x07);
string[1] = 0x80 | ((unicode_value >> 12) & 0x3F);
string[2] = 0x80 | ((unicode_value >> 6) & 0x3F);
string[3] = 0x80 | (unicode_value & 0x3F);
string[4] = '\0';
}
}
/*
* Gets wide char from string (first char).
*
* Returns the char as "wint_t", WEOF is string was NULL/empty or in case of
* error.
*/
wint_t
utf8_wide_char (const char *string)
{
int char_size;
wint_t result;
if (!string || !string[0])
return WEOF;
char_size = utf8_char_size (string);
switch (char_size)
{
case 1:
result = (wint_t)string[0];
break;
case 2:
result = ((wint_t)((unsigned char)string[0])) << 8
| ((wint_t)((unsigned char)string[1]));
break;
case 3:
result = ((wint_t)((unsigned char)string[0])) << 16
| ((wint_t)((unsigned char)string[1])) << 8
| ((wint_t)((unsigned char)string[2]));
break;
case 4:
result = ((wint_t)((unsigned char)string[0])) << 24
| ((wint_t)((unsigned char)string[1])) << 16
| ((wint_t)((unsigned char)string[2])) << 8
| ((wint_t)((unsigned char)string[3]));
break;
default:
result = WEOF;
}
return result;
}
/*
* Gets size of UTF-8 char (in bytes).
*
* Returns an integer between 0 and 4.
*/
int
utf8_char_size (const char *string)
{
if (!string)
return 0;
return utf8_next_char (string) - string;
}
/*
* Gets length of an UTF-8 string in number of chars (not bytes).
* Result is <= strlen (string).
*
* Returns length of string (>= 0).
*/
int
utf8_strlen (const char *string)
{
int length;
if (!string)
return 0;
length = 0;
while (string && string[0])
{
string = utf8_next_char (string);
length++;
}
return length;
}
/*
* Gets length of an UTF-8 string for N bytes max in string.
*
* Returns length of string (>= 0).
*/
int
utf8_strnlen (const char *string, int bytes)
{
char *start;
int length;
if (!string)
return 0;
start = (char *)string;
length = 0;
while (string && string[0] && (string - start < bytes))
{
string = utf8_next_char (string);
length++;
}
return length;
}
/*
* Gets number of chars needed on screen to display the UTF-8 string.
*
* Returns the number of chars (>= 0).
*/
int
utf8_strlen_screen (const char *string)
{
int length, num_char, add_for_tab;
wchar_t *alloc_wstring, *ptr_wstring, wstring[4+2];
const char *ptr_string;
if (!string || !string[0])
return 0;
if (!local_utf8)
return utf8_strlen (string);
alloc_wstring = NULL;
if (!string[1] || !string[2] || !string[3] || !string[4])
{
/* optimization for max 4 chars: no malloc */
num_char = 4 + 1;
ptr_wstring = wstring;
}
else
{
num_char = mbstowcs (NULL, string, 0) + 1;
alloc_wstring = malloc ((num_char + 1) * sizeof (alloc_wstring[0]));
if (!alloc_wstring)
return utf8_strlen (string);
ptr_wstring = alloc_wstring;
}
if (mbstowcs (ptr_wstring, string, num_char) != (size_t)(-1))
{
length = wcswidth (ptr_wstring, num_char);
/*
* if the char is non-printable, wcswidth returns -1
* (for example the length of the snowman without snow (U+26C4) == -1)
* => in this case, consider the length is 1, to prevent any display bug
*/
if (length < 0)
length = 1;
}
else
length = utf8_strlen (string);
if (alloc_wstring)
free (alloc_wstring);
add_for_tab = CONFIG_INTEGER(config_look_tab_width) - 1;
if (add_for_tab > 0)
{
for (ptr_string = string; ptr_string[0]; ptr_string++)
{
if (ptr_string[0] == '\t')
length += add_for_tab;
}
}
return length;
}
/*
* Compares two UTF-8 chars (case sensitive).
*
* Returns:
* -1: string1 < string2
* 0: string1 == string2
* 1: string1 > string2
*/
int
utf8_charcmp (const char *string1, const char *string2)
{
int length1, length2, i, diff;
if (!string1 || !string2)
return (string1) ? 1 : ((string2) ? -1 : 0);
length1 = utf8_char_size (string1);
length2 = utf8_char_size (string2);
i = 0;
while ((i < length1) && (i < length2))
{
diff = (int)((unsigned char) string1[i]) - (int)((unsigned char) string2[i]);
if (diff != 0)
return (diff < 0) ? -1 : 1;
i++;
}
/* string1 == string2 ? */
if ((i == length1) && (i == length2))
return 0;
/* string1 < string2 ? */
if (i == length1)
return 1;
/* string1 > string2 */
return -1;
}
/*
* Compares two UTF-8 chars (case is ignored).
*
* Returns:
* -1: string1 < string2
* 0: string1 == string2
* 1: string1 > string2
*/
int
utf8_charcasecmp (const char *string1, const char *string2)
{
wint_t wchar1, wchar2;
if (!string1 || !string2)
return (string1) ? 1 : ((string2) ? -1 : 0);
wchar1 = utf8_wide_char (string1);
if ((wchar1 >= 'A') && (wchar1 <= 'Z'))
wchar1 += ('a' - 'A');
wchar2 = utf8_wide_char (string2);
if ((wchar2 >= 'A') && (wchar2 <= 'Z'))
wchar2 += ('a' - 'A');
return (wchar1 < wchar2) ? -1 : ((wchar1 == wchar2) ? 0 : 1);
}
/*
* Compares two UTF-8 chars (case is ignored) using a range.
*
* The range is the number of chars which can be converted from upper to lower
* case. For example 26 = all letters of alphabet, 29 = all letters + 3 chars.
*
* Examples:
* - range = 26: A-Z ==> a-z
* - range = 29: A-Z [ \ ] ==> a-z { | }
* - range = 30: A-Z [ \ ] ^ ==> a-z { | } ~
* (ranges 29 and 30 are used by some protocols like IRC)
*
* Returns:
* < 0: char1 < char2
* 0: char1 == char2
* > 0: char1 > char2
*/
int
utf8_charcasecmp_range (const char *string1, const char *string2, int range)
{
wint_t wchar1, wchar2;
if (!string1 || !string2)
return (string1) ? 1 : ((string2) ? -1 : 0);
wchar1 = utf8_wide_char (string1);
if ((wchar1 >= (wint_t)'A') && (wchar1 < (wint_t)('A' + range)))
wchar1 += ('a' - 'A');
wchar2 = utf8_wide_char (string2);
if ((wchar2 >= (wint_t)'A') && (wchar2 < (wint_t)('A' + range)))
wchar2 += ('a' - 'A');
return (wchar1 < wchar2) ? -1 : ((wchar1 == wchar2) ? 0 : 1);
}
/*
* Gets number of chars needed on screen to display the UTF-8 char.
*
* Returns the number of chars (>= 0).
*/
int
utf8_char_size_screen (const char *string)
{
int char_size;
char utf_char[16];
if (!string)
return 0;
char_size = utf8_char_size (string);
if (char_size == 0)
return 0;
memcpy (utf_char, string, char_size);
utf_char[char_size] = '\0';
return utf8_strlen_screen (utf_char);
}
/*
* Moves forward N chars in an UTF-8 string.
*
* Returns pointer to the new position in string.
*/
const char *
utf8_add_offset (const char *string, int offset)
{
if (!string)
return NULL;
while (string && string[0] && (offset > 0))
{
string = utf8_next_char (string);
offset--;
}
return string;
}
/*
* Gets real position in UTF-8 string, in bytes.
*
* Argument "pos" is a number of chars (not bytes).
*
* Example: ("déca", 2) returns 3.
*
* Returns the real position (>= 0).
*/
int
utf8_real_pos (const char *string, int pos)
{
int count, real_pos;
const char *next_char;
if (!string)
return pos;
count = 0;
real_pos = 0;
while (string && string[0] && (count < pos))
{
next_char = utf8_next_char (string);
real_pos += (next_char - string);
string = next_char;
count++;
}
return real_pos;
}
/*
* Gets position in UTF-8 string, in chars.
*
* Argument "real_pos" is a number of bytes (not chars).
*
* Example: ("déca", 3) returns 2.
*
* Returns the position in string.
*/
int
utf8_pos (const char *string, int real_pos)
{
int count;
char *limit;
if (!string || !weechat_local_charset)
return real_pos;
count = 0;
limit = (char *)string + real_pos;
while (string && string[0] && (string < limit))
{
string = utf8_next_char (string);
count++;
}
return count;
}
/*
* Duplicates an UTF-8 string, with max N chars.
*
* Note: result must be freed after use.
*/
char *
utf8_strndup (const char *string, int length)
{
const char *end;
if (!string || (length < 0))
return NULL;
if (length == 0)
return strdup ("");
end = utf8_add_offset (string, length);
if (!end || (end == string))
return strdup (string);
return string_strndup (string, end - string);
}
Reference in New Issue View Git Blame Copy Permalink