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a2403a0ed9afdfaea7abb5555dbdf555b56eff9a
neovim/src/nvim/mbyte.c
ZviRackover 2bddc4ca54 Remove occurences of mb_head_off
2018-08-15 22:02:33 +03:00

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
/// mbyte.c: Code specifically for handling multi-byte characters.
/// Multibyte extensions partly by Sung-Hoon Baek
///
/// The encoding used in nvim is always UTF-8. "enc_utf8" and "has_mbyte" is
/// thus always true. "enc_dbcs" is always zero. The 'encoding' option is
/// read-only and always reads "utf-8".
///
/// The cell width on the display needs to be determined from the character
/// value. Recognizing UTF-8 bytes is easy: 0xxx.xxxx is a single-byte char,
/// 10xx.xxxx is a trailing byte, 11xx.xxxx is a leading byte of a multi-byte
/// character. To make things complicated, up to six composing characters
/// are allowed. These are drawn on top of the first char. For most editing
/// the sequence of bytes with composing characters included is considered to
/// be one character.
///
/// UTF-8 is used everywhere in the core. This is in registers, text
/// manipulation, buffers, etc. Nvim core communicates with external plugins
/// and GUIs in this encoding.
///
/// The encoding of a file is specified with 'fileencoding'. Conversion
/// is to be done when it's different from "utf-8".
///
/// Vim scripts may contain an ":scriptencoding" command. This has an effect
/// for some commands, like ":menutrans".
#include <inttypes.h>
#include <stdbool.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "nvim/vim.h"
#include "nvim/ascii.h"
#ifdef HAVE_LOCALE_H
# include <locale.h>
#endif
#include "nvim/eval.h"
#include "nvim/path.h"
#include "nvim/iconv.h"
#include "nvim/mbyte.h"
#include "nvim/charset.h"
#include "nvim/cursor.h"
#include "nvim/fileio.h"
#include "nvim/func_attr.h"
#include "nvim/memline.h"
#include "nvim/message.h"
#include "nvim/misc1.h"
#include "nvim/memory.h"
#include "nvim/option.h"
#include "nvim/screen.h"
#include "nvim/spell.h"
#include "nvim/strings.h"
#include "nvim/os/os.h"
#include "nvim/arabic.h"
#include "nvim/mark.h"
typedef struct {
int rangeStart;
int rangeEnd;
int step;
int offset;
} convertStruct;
struct interval {
long first;
long last;
};
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "mbyte.c.generated.h"
# include "unicode_tables.generated.h"
#endif
char_u e_loadlib[] = "E370: Could not load library %s";
char_u e_loadfunc[] = "E448: Could not load library function %s";
// To speed up BYTELEN(); keep a lookup table to quickly get the length in
// bytes of a UTF-8 character from the first byte of a UTF-8 string. Bytes
// which are illegal when used as the first byte have a 1. The NUL byte has
// length 1.
const uint8_t utf8len_tab[] = {
// ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 ?A ?B ?C ?D ?E ?F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 1?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 2?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 3?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 4?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 5?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 6?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 7?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 8?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 9?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // A?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // B?
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C?
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // D?
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // E?
4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1, // F?
};
// Like utf8len_tab above, but using a zero for illegal lead bytes.
const uint8_t utf8len_tab_zero[] = {
// ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 ?A ?B ?C ?D ?E ?F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 1?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 2?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 3?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 4?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 5?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 6?
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 7?
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8?
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9?
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // A?
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // B?
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C?
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // D?
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // E?
4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 0, 0, // F?
};
/*
* Canonical encoding names and their properties.
* "iso-8859-n" is handled by enc_canonize() directly.
*/
static struct
{ const char *name; int prop; int codepage; }
enc_canon_table[] =
{
#define IDX_LATIN_1 0
{"latin1", ENC_8BIT + ENC_LATIN1, 1252},
#define IDX_ISO_2 1
{"iso-8859-2", ENC_8BIT, 0},
#define IDX_ISO_3 2
{"iso-8859-3", ENC_8BIT, 0},
#define IDX_ISO_4 3
{"iso-8859-4", ENC_8BIT, 0},
#define IDX_ISO_5 4
{"iso-8859-5", ENC_8BIT, 0},
#define IDX_ISO_6 5
{"iso-8859-6", ENC_8BIT, 0},
#define IDX_ISO_7 6
{"iso-8859-7", ENC_8BIT, 0},
#define IDX_ISO_8 7
{"iso-8859-8", ENC_8BIT, 0},
#define IDX_ISO_9 8
{"iso-8859-9", ENC_8BIT, 0},
#define IDX_ISO_10 9
{"iso-8859-10", ENC_8BIT, 0},
#define IDX_ISO_11 10
{"iso-8859-11", ENC_8BIT, 0},
#define IDX_ISO_13 11
{"iso-8859-13", ENC_8BIT, 0},
#define IDX_ISO_14 12
{"iso-8859-14", ENC_8BIT, 0},
#define IDX_ISO_15 13
{"iso-8859-15", ENC_8BIT + ENC_LATIN9, 0},
#define IDX_KOI8_R 14
{"koi8-r", ENC_8BIT, 0},
#define IDX_KOI8_U 15
{"koi8-u", ENC_8BIT, 0},
#define IDX_UTF8 16
{"utf-8", ENC_UNICODE, 0},
#define IDX_UCS2 17
{"ucs-2", ENC_UNICODE + ENC_ENDIAN_B + ENC_2BYTE, 0},
#define IDX_UCS2LE 18
{"ucs-2le", ENC_UNICODE + ENC_ENDIAN_L + ENC_2BYTE, 0},
#define IDX_UTF16 19
{"utf-16", ENC_UNICODE + ENC_ENDIAN_B + ENC_2WORD, 0},
#define IDX_UTF16LE 20
{"utf-16le", ENC_UNICODE + ENC_ENDIAN_L + ENC_2WORD, 0},
#define IDX_UCS4 21
{"ucs-4", ENC_UNICODE + ENC_ENDIAN_B + ENC_4BYTE, 0},
#define IDX_UCS4LE 22
{"ucs-4le", ENC_UNICODE + ENC_ENDIAN_L + ENC_4BYTE, 0},
/* For debugging DBCS encoding on Unix. */
#define IDX_DEBUG 23
{"debug", ENC_DBCS, DBCS_DEBUG},
#define IDX_EUC_JP 24
{"euc-jp", ENC_DBCS, DBCS_JPNU},
#define IDX_SJIS 25
{"sjis", ENC_DBCS, DBCS_JPN},
#define IDX_EUC_KR 26
{"euc-kr", ENC_DBCS, DBCS_KORU},
#define IDX_EUC_CN 27
{"euc-cn", ENC_DBCS, DBCS_CHSU},
#define IDX_EUC_TW 28
{"euc-tw", ENC_DBCS, DBCS_CHTU},
#define IDX_BIG5 29
{"big5", ENC_DBCS, DBCS_CHT},
/* MS-DOS and MS-Windows codepages are included here, so that they can be
* used on Unix too. Most of them are similar to ISO-8859 encodings, but
* not exactly the same. */
#define IDX_CP437 30
{"cp437", ENC_8BIT, 437}, /* like iso-8859-1 */
#define IDX_CP737 31
{"cp737", ENC_8BIT, 737}, /* like iso-8859-7 */
#define IDX_CP775 32
{"cp775", ENC_8BIT, 775}, /* Baltic */
#define IDX_CP850 33
{"cp850", ENC_8BIT, 850}, /* like iso-8859-4 */
#define IDX_CP852 34
{"cp852", ENC_8BIT, 852}, /* like iso-8859-1 */
#define IDX_CP855 35
{"cp855", ENC_8BIT, 855}, /* like iso-8859-2 */
#define IDX_CP857 36
{"cp857", ENC_8BIT, 857}, /* like iso-8859-5 */
#define IDX_CP860 37
{"cp860", ENC_8BIT, 860}, /* like iso-8859-9 */
#define IDX_CP861 38
{"cp861", ENC_8BIT, 861}, /* like iso-8859-1 */
#define IDX_CP862 39
{"cp862", ENC_8BIT, 862}, /* like iso-8859-1 */
#define IDX_CP863 40
{"cp863", ENC_8BIT, 863}, /* like iso-8859-8 */
#define IDX_CP865 41
{"cp865", ENC_8BIT, 865}, /* like iso-8859-1 */
#define IDX_CP866 42
{"cp866", ENC_8BIT, 866}, /* like iso-8859-5 */
#define IDX_CP869 43
{"cp869", ENC_8BIT, 869}, /* like iso-8859-7 */
#define IDX_CP874 44
{"cp874", ENC_8BIT, 874}, /* Thai */
#define IDX_CP932 45
{"cp932", ENC_DBCS, DBCS_JPN},
#define IDX_CP936 46
{"cp936", ENC_DBCS, DBCS_CHS},
#define IDX_CP949 47
{"cp949", ENC_DBCS, DBCS_KOR},
#define IDX_CP950 48
{"cp950", ENC_DBCS, DBCS_CHT},
#define IDX_CP1250 49
{"cp1250", ENC_8BIT, 1250}, /* Czech, Polish, etc. */
#define IDX_CP1251 50
{"cp1251", ENC_8BIT, 1251}, /* Cyrillic */
/* cp1252 is considered to be equal to latin1 */
#define IDX_CP1253 51
{"cp1253", ENC_8BIT, 1253}, /* Greek */
#define IDX_CP1254 52
{"cp1254", ENC_8BIT, 1254}, /* Turkish */
#define IDX_CP1255 53
{"cp1255", ENC_8BIT, 1255}, /* Hebrew */
#define IDX_CP1256 54
{"cp1256", ENC_8BIT, 1256}, /* Arabic */
#define IDX_CP1257 55
{"cp1257", ENC_8BIT, 1257}, /* Baltic */
#define IDX_CP1258 56
{"cp1258", ENC_8BIT, 1258}, /* Vietnamese */
#define IDX_MACROMAN 57
{"macroman", ENC_8BIT + ENC_MACROMAN, 0}, /* Mac OS */
#define IDX_HPROMAN8 58
{"hp-roman8", ENC_8BIT, 0}, /* HP Roman8 */
#define IDX_COUNT 59
};
/*
* Aliases for encoding names.
*/
static struct
{ const char *name; int canon; }
enc_alias_table[] =
{
{"ansi", IDX_LATIN_1},
{"iso-8859-1", IDX_LATIN_1},
{"latin2", IDX_ISO_2},
{"latin3", IDX_ISO_3},
{"latin4", IDX_ISO_4},
{"cyrillic", IDX_ISO_5},
{"arabic", IDX_ISO_6},
{"greek", IDX_ISO_7},
{"hebrew", IDX_ISO_8},
{"latin5", IDX_ISO_9},
{"turkish", IDX_ISO_9}, /* ? */
{"latin6", IDX_ISO_10},
{"nordic", IDX_ISO_10}, /* ? */
{"thai", IDX_ISO_11}, /* ? */
{"latin7", IDX_ISO_13},
{"latin8", IDX_ISO_14},
{"latin9", IDX_ISO_15},
{"utf8", IDX_UTF8},
{"unicode", IDX_UCS2},
{"ucs2", IDX_UCS2},
{"ucs2be", IDX_UCS2},
{"ucs-2be", IDX_UCS2},
{"ucs2le", IDX_UCS2LE},
{"utf16", IDX_UTF16},
{"utf16be", IDX_UTF16},
{"utf-16be", IDX_UTF16},
{"utf16le", IDX_UTF16LE},
{"ucs4", IDX_UCS4},
{"ucs4be", IDX_UCS4},
{"ucs-4be", IDX_UCS4},
{"ucs4le", IDX_UCS4LE},
{"utf32", IDX_UCS4},
{"utf-32", IDX_UCS4},
{"utf32be", IDX_UCS4},
{"utf-32be", IDX_UCS4},
{"utf32le", IDX_UCS4LE},
{"utf-32le", IDX_UCS4LE},
{"932", IDX_CP932},
{"949", IDX_CP949},
{"936", IDX_CP936},
{"gbk", IDX_CP936},
{"950", IDX_CP950},
{"eucjp", IDX_EUC_JP},
{"unix-jis", IDX_EUC_JP},
{"ujis", IDX_EUC_JP},
{"shift-jis", IDX_SJIS},
{"pck", IDX_SJIS}, /* Sun: PCK */
{"euckr", IDX_EUC_KR},
{"5601", IDX_EUC_KR}, /* Sun: KS C 5601 */
{"euccn", IDX_EUC_CN},
{"gb2312", IDX_EUC_CN},
{"euctw", IDX_EUC_TW},
{"japan", IDX_EUC_JP},
{"korea", IDX_EUC_KR},
{"prc", IDX_EUC_CN},
{"chinese", IDX_EUC_CN},
{"taiwan", IDX_EUC_TW},
{"cp950", IDX_BIG5},
{"950", IDX_BIG5},
{"mac", IDX_MACROMAN},
{"mac-roman", IDX_MACROMAN},
{NULL, 0}
};
/*
* Find encoding "name" in the list of canonical encoding names.
* Returns -1 if not found.
*/
static int enc_canon_search(const char_u *name)
{
int i;
for (i = 0; i < IDX_COUNT; ++i)
if (STRCMP(name, enc_canon_table[i].name) == 0)
return i;
return -1;
}
/*
* Find canonical encoding "name" in the list and return its properties.
* Returns 0 if not found.
*/
int enc_canon_props(const char_u *name)
{
int i;
i = enc_canon_search(name);
if (i >= 0)
return enc_canon_table[i].prop;
if (STRNCMP(name, "2byte-", 6) == 0)
return ENC_DBCS;
if (STRNCMP(name, "8bit-", 5) == 0 || STRNCMP(name, "iso-8859-", 9) == 0)
return ENC_8BIT;
return 0;
}
/*
* Return the size of the BOM for the current buffer:
* 0 - no BOM
* 2 - UCS-2 or UTF-16 BOM
* 4 - UCS-4 BOM
* 3 - UTF-8 BOM
*/
int bomb_size(void)
{
int n = 0;
if (curbuf->b_p_bomb && !curbuf->b_p_bin) {
if (*curbuf->b_p_fenc == NUL
|| STRCMP(curbuf->b_p_fenc, "utf-8") == 0) {
n = 3;
} else if (STRNCMP(curbuf->b_p_fenc, "ucs-2", 5) == 0
|| STRNCMP(curbuf->b_p_fenc, "utf-16", 6) == 0) {
n = 2;
} else if (STRNCMP(curbuf->b_p_fenc, "ucs-4", 5) == 0) {
n = 4;
}
}
return n;
}
/*
* Remove all BOM from "s" by moving remaining text.
*/
void remove_bom(char_u *s)
{
char *p = (char *)s;
while ((p = strchr(p, 0xef)) != NULL) {
if ((uint8_t)p[1] == 0xbb && (uint8_t)p[2] == 0xbf) {
STRMOVE(p, p + 3);
} else {
p++;
}
}
}
/*
* Get class of pointer:
* 0 for blank or NUL
* 1 for punctuation
* 2 for an (ASCII) word character
* >2 for other word characters
*/
int mb_get_class(const char_u *p)
{
return mb_get_class_tab(p, curbuf->b_chartab);
}
int mb_get_class_tab(const char_u *p, const uint64_t *const chartab)
{
if (MB_BYTE2LEN(p[0]) == 1) {
if (p[0] == NUL || ascii_iswhite(p[0])) {
return 0;
}
if (vim_iswordc_tab(p[0], chartab)) {
return 2;
}
return 1;
}
return utf_class_tab(utf_ptr2char(p), chartab);
}
/*
* Return true if "c" is in "table".
*/
static bool intable(const struct interval *table, size_t n_items, int c)
{
int mid, bot, top;
/* first quick check for Latin1 etc. characters */
if (c < table[0].first)
return false;
/* binary search in table */
bot = 0;
top = (int)(n_items - 1);
while (top >= bot) {
mid = (bot + top) / 2;
if (table[mid].last < c)
bot = mid + 1;
else if (table[mid].first > c)
top = mid - 1;
else
return true;
}
return false;
}
/*
* For UTF-8 character "c" return 2 for a double-width character, 1 for others.
* Returns 4 or 6 for an unprintable character.
* Is only correct for characters >= 0x80.
* When p_ambw is "double", return 2 for a character with East Asian Width
* class 'A'(mbiguous).
*/
int utf_char2cells(int c)
{
if (c >= 0x100) {
#ifdef USE_WCHAR_FUNCTIONS
/*
* Assume the library function wcwidth() works better than our own
* stuff. It should return 1 for ambiguous width chars!
*/
int n = wcwidth(c);
if (n < 0)
return 6; /* unprintable, displays <xxxx> */
if (n > 1)
return n;
#else
if (!utf_printable(c))
return 6; /* unprintable, displays <xxxx> */
if (intable(doublewidth, ARRAY_SIZE(doublewidth), c))
return 2;
#endif
if (p_emoji && intable(emoji_width, ARRAY_SIZE(emoji_width), c)) {
return 2;
}
}
/* Characters below 0x100 are influenced by 'isprint' option */
else if (c >= 0x80 && !vim_isprintc(c))
return 4; /* unprintable, displays <xx> */
if (c >= 0x80 && *p_ambw == 'd' && intable(ambiguous, ARRAY_SIZE(ambiguous), c))
return 2;
return 1;
}
/// Return the number of display cells character at "*p" occupies.
/// This doesn't take care of unprintable characters, use ptr2cells() for that.
int utf_ptr2cells(const char_u *p)
{
int c;
/* Need to convert to a wide character. */
if (*p >= 0x80) {
c = utf_ptr2char(p);
/* An illegal byte is displayed as <xx>. */
if (utf_ptr2len(p) == 1 || c == NUL)
return 4;
/* If the char is ASCII it must be an overlong sequence. */
if (c < 0x80)
return char2cells(c);
return utf_char2cells(c);
}
return 1;
}
/// Like utf_ptr2cells(), but limit string length to "size".
/// For an empty string or truncated character returns 1.
int utf_ptr2cells_len(const char_u *p, int size)
{
int c;
/* Need to convert to a wide character. */
if (size > 0 && *p >= 0x80) {
if (utf_ptr2len_len(p, size) < utf8len_tab[*p])
return 1; /* truncated */
c = utf_ptr2char(p);
/* An illegal byte is displayed as <xx>. */
if (utf_ptr2len(p) == 1 || c == NUL)
return 4;
/* If the char is ASCII it must be an overlong sequence. */
if (c < 0x80)
return char2cells(c);
return utf_char2cells(c);
}
return 1;
}
/// Calculate the number of cells occupied by string `str`.
///
/// @param str The source string, may not be NULL, must be a NUL-terminated
/// string.
/// @return The number of cells occupied by string `str`
size_t mb_string2cells(const char_u *str)
{
size_t clen = 0;
for (const char_u *p = str; *p != NUL; p += (*mb_ptr2len)(p)) {
clen += (*mb_ptr2cells)(p);
}
return clen;
}
/// Return number of display cells for char at ScreenLines[off].
/// We make sure that the offset used is less than "max_off".
int utf_off2cells(unsigned off, unsigned max_off)
{
return (off + 1 < max_off && ScreenLines[off + 1][0] == 0) ? 2 : 1;
}
/// Convert a UTF-8 byte sequence to a wide character
///
/// If the sequence is illegal or truncated by a NUL then the first byte is
/// returned.
/// For an overlong sequence this may return zero.
/// Does not include composing characters for obvious reasons.
///
/// @param[in] p String to convert.
///
/// @return Unicode codepoint or byte value.
int utf_ptr2char(const char_u *const p)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
{
if (p[0] < 0x80) { // Be quick for ASCII.
return p[0];
}
const uint8_t len = utf8len_tab_zero[p[0]];
if (len > 1 && (p[1] & 0xc0) == 0x80) {
if (len == 2) {
return ((p[0] & 0x1f) << 6) + (p[1] & 0x3f);
}
if ((p[2] & 0xc0) == 0x80) {
if (len == 3) {
return (((p[0] & 0x0f) << 12) + ((p[1] & 0x3f) << 6)
+ (p[2] & 0x3f));
}
if ((p[3] & 0xc0) == 0x80) {
if (len == 4) {
return (((p[0] & 0x07) << 18) + ((p[1] & 0x3f) << 12)
+ ((p[2] & 0x3f) << 6) + (p[3] & 0x3f));
}
if ((p[4] & 0xc0) == 0x80) {
if (len == 5) {
return (((p[0] & 0x03) << 24) + ((p[1] & 0x3f) << 18)
+ ((p[2] & 0x3f) << 12) + ((p[3] & 0x3f) << 6)
+ (p[4] & 0x3f));
}
if ((p[5] & 0xc0) == 0x80 && len == 6) {
return (((p[0] & 0x01) << 30) + ((p[1] & 0x3f) << 24)
+ ((p[2] & 0x3f) << 18) + ((p[3] & 0x3f) << 12)
+ ((p[4] & 0x3f) << 6) + (p[5] & 0x3f));
}
}
}
}
}
// Illegal value: just return the first byte.
return p[0];
}
/*
* Convert a UTF-8 byte sequence to a wide character.
* String is assumed to be terminated by NUL or after "n" bytes, whichever
* comes first.
* The function is safe in the sense that it never accesses memory beyond the
* first "n" bytes of "s".
*
* On success, returns decoded codepoint, advances "s" to the beginning of
* next character and decreases "n" accordingly.
*
* If end of string was reached, returns 0 and, if "n" > 0, advances "s" past
* NUL byte.
*
* If byte sequence is illegal or incomplete, returns -1 and does not advance
* "s".
*/
static int utf_safe_read_char_adv(const char_u **s, size_t *n)
{
int c;
if (*n == 0) /* end of buffer */
return 0;
uint8_t k = utf8len_tab_zero[**s];
if (k == 1) {
/* ASCII character or NUL */
(*n)--;
return *(*s)++;
}
if (k <= *n) {
/* We have a multibyte sequence and it isn't truncated by buffer
* limits so utf_ptr2char() is safe to use. Or the first byte is
* illegal (k=0), and it's also safe to use utf_ptr2char(). */
c = utf_ptr2char(*s);
/* On failure, utf_ptr2char() returns the first byte, so here we
* check equality with the first byte. The only non-ASCII character
* which equals the first byte of its own UTF-8 representation is
* U+00C3 (UTF-8: 0xC3 0x83), so need to check that special case too.
* It's safe even if n=1, else we would have k=2 > n. */
if (c != (int)(**s) || (c == 0xC3 && (*s)[1] == 0x83)) {
/* byte sequence was successfully decoded */
*s += k;
*n -= k;
return c;
}
}
/* byte sequence is incomplete or illegal */
return -1;
}
/*
* Get character at **pp and advance *pp to the next character.
* Note: composing characters are skipped!
*/
int mb_ptr2char_adv(const char_u **const pp)
{
int c;
c = utf_ptr2char(*pp);
*pp += (*mb_ptr2len)(*pp);
return c;
}
/*
* Get character at **pp and advance *pp to the next character.
* Note: composing characters are returned as separate characters.
*/
int mb_cptr2char_adv(const char_u **pp)
{
int c;
c = utf_ptr2char(*pp);
*pp += utf_ptr2len(*pp);
return c;
}
/*
* Check if the character pointed to by "p2" is a composing character when it
* comes after "p1". For Arabic sometimes "ab" is replaced with "c", which
* behaves like a composing character.
*/
bool utf_composinglike(const char_u *p1, const char_u *p2)
{
int c2;
c2 = utf_ptr2char(p2);
if (utf_iscomposing(c2))
return true;
if (!arabic_maycombine(c2))
return false;
return arabic_combine(utf_ptr2char(p1), c2);
}
/// Convert a UTF-8 string to a wide character
///
/// Also gets up to #MAX_MCO composing characters.
///
/// @param[out] pcc Location where to store composing characters. Must have
/// space at least for #MAX_MCO + 1 elements.
///
/// @return leading character.
int utfc_ptr2char(const char_u *p, int *pcc)
{
int len;
int c;
int cc;
int i = 0;
c = utf_ptr2char(p);
len = utf_ptr2len(p);
/* Only accept a composing char when the first char isn't illegal. */
if ((len > 1 || *p < 0x80)
&& p[len] >= 0x80
&& UTF_COMPOSINGLIKE(p, p + len)) {
cc = utf_ptr2char(p + len);
for (;; ) {
pcc[i++] = cc;
if (i == MAX_MCO)
break;
len += utf_ptr2len(p + len);
if (p[len] < 0x80 || !utf_iscomposing(cc = utf_ptr2char(p + len)))
break;
}
}
if (i < MAX_MCO) /* last composing char must be 0 */
pcc[i] = 0;
return c;
}
/*
* Convert a UTF-8 byte string to a wide character. Also get up to MAX_MCO
* composing characters. Use no more than p[maxlen].
*
* @param [out] pcc: composing chars, last one is 0
*/
int utfc_ptr2char_len(const char_u *p, int *pcc, int maxlen)
{
#define IS_COMPOSING(s1, s2, s3) \
(i == 0 ? UTF_COMPOSINGLIKE((s1), (s2)) : utf_iscomposing((s3)))
assert(maxlen > 0);
int i = 0;
int len = utf_ptr2len_len(p, maxlen);
// Is it safe to use utf_ptr2char()?
bool safe = len > 1 && len <= maxlen;
int c = safe ? utf_ptr2char(p) : *p;
// Only accept a composing char when the first char isn't illegal.
if ((safe || c < 0x80) && len < maxlen && p[len] >= 0x80) {
for (; i < MAX_MCO; i++) {
int len_cc = utf_ptr2len_len(p + len, maxlen - len);
safe = len_cc > 1 && len_cc <= maxlen - len;
if (!safe || (pcc[i] = utf_ptr2char(p + len)) < 0x80
|| !IS_COMPOSING(p, p + len, pcc[i])) {
break;
}
len += len_cc;
}
}
if (i < MAX_MCO) {
// last composing char must be 0
pcc[i] = 0;
}
return c;
#undef ISCOMPOSING
}
/// Get the length of a UTF-8 byte sequence representing a single codepoint
///
/// @param[in] p UTF-8 string.
///
/// @return Sequence length, 0 for empty string and 1 for non-UTF-8 byte
/// sequence.
int utf_ptr2len(const char_u *const p)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
{
if (*p == NUL) {
return 0;
}
const int len = utf8len_tab[*p];
for (int i = 1; i < len; i++) {
if ((p[i] & 0xc0) != 0x80) {
return 1;
}
}
return len;
}
/*
* Return length of UTF-8 character, obtained from the first byte.
* "b" must be between 0 and 255!
* Returns 1 for an invalid first byte value.
*/
int utf_byte2len(int b)
{
return utf8len_tab[b];
}
/*
* Get the length of UTF-8 byte sequence "p[size]". Does not include any
* following composing characters.
* Returns 1 for "".
* Returns 1 for an illegal byte sequence (also in incomplete byte seq.).
* Returns number > "size" for an incomplete byte sequence.
* Never returns zero.
*/
int utf_ptr2len_len(const char_u *p, int size)
{
int len;
int i;
int m;
len = utf8len_tab[*p];
if (len == 1)
return 1; /* NUL, ascii or illegal lead byte */
if (len > size)
m = size; /* incomplete byte sequence. */
else
m = len;
for (i = 1; i < m; ++i)
if ((p[i] & 0xc0) != 0x80)
return 1;
return len;
}
/// Return the number of bytes occupied by a UTF-8 character in a string
///
/// This includes following composing characters.
int utfc_ptr2len(const char_u *const p)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
{
uint8_t b0 = (uint8_t)(*p);
if (b0 == NUL) {
return 0;
}
if (b0 < 0x80 && p[1] < 0x80) { // be quick for ASCII
return 1;
}
// Skip over first UTF-8 char, stopping at a NUL byte.
int len = utf_ptr2len(p);
// Check for illegal byte.
if (len == 1 && b0 >= 0x80) {
return 1;
}
// Check for composing characters. We can handle only the first six, but
// skip all of them (otherwise the cursor would get stuck).
int prevlen = 0;
for (;;) {
if (p[len] < 0x80 || !UTF_COMPOSINGLIKE(p + prevlen, p + len)) {
return len;
}
// Skip over composing char.
prevlen = len;
len += utf_ptr2len(p + len);
}
}
/*
* Return the number of bytes the UTF-8 encoding of the character at "p[size]"
* takes. This includes following composing characters.
* Returns 0 for an empty string.
* Returns 1 for an illegal char or an incomplete byte sequence.
*/
int utfc_ptr2len_len(const char_u *p, int size)
{
int len;
int prevlen;
if (size < 1 || *p == NUL)
return 0;
if (p[0] < 0x80 && (size == 1 || p[1] < 0x80)) /* be quick for ASCII */
return 1;
/* Skip over first UTF-8 char, stopping at a NUL byte. */
len = utf_ptr2len_len(p, size);
/* Check for illegal byte and incomplete byte sequence. */
if ((len == 1 && p[0] >= 0x80) || len > size)
return 1;
/*
* Check for composing characters. We can handle only the first six, but
* skip all of them (otherwise the cursor would get stuck).
*/
prevlen = 0;
while (len < size) {
int len_next_char;
if (p[len] < 0x80)
break;
/*
* Next character length should not go beyond size to ensure that
* UTF_COMPOSINGLIKE(...) does not read beyond size.
*/
len_next_char = utf_ptr2len_len(p + len, size - len);
if (len_next_char > size - len)
break;
if (!UTF_COMPOSINGLIKE(p + prevlen, p + len))
break;
/* Skip over composing char */
prevlen = len;
len += len_next_char;
}
return len;
}
/// Determine how many bytes certain unicode codepoint will occupy
int utf_char2len(const int c)
{
if (c < 0x80) {
return 1;
} else if (c < 0x800) {
return 2;
} else if (c < 0x10000) {
return 3;
} else if (c < 0x200000) {
return 4;
} else if (c < 0x4000000) {
return 5;
} else {
return 6;
}
}
/// Convert Unicode character to UTF-8 string
///
/// @param c character to convert to \p buf
/// @param[out] buf UTF-8 string generated from \p c, does not add \0
/// @return Number of bytes (1-6). Does not include composing characters.
int utf_char2bytes(const int c, char_u *const buf)
{
if (c < 0x80) { // 7 bits
buf[0] = c;
return 1;
} else if (c < 0x800) { // 11 bits
buf[0] = 0xc0 + ((unsigned)c >> 6);
buf[1] = 0x80 + (c & 0x3f);
return 2;
} else if (c < 0x10000) { // 16 bits
buf[0] = 0xe0 + ((unsigned)c >> 12);
buf[1] = 0x80 + (((unsigned)c >> 6) & 0x3f);
buf[2] = 0x80 + (c & 0x3f);
return 3;
} else if (c < 0x200000) { // 21 bits
buf[0] = 0xf0 + ((unsigned)c >> 18);
buf[1] = 0x80 + (((unsigned)c >> 12) & 0x3f);
buf[2] = 0x80 + (((unsigned)c >> 6) & 0x3f);
buf[3] = 0x80 + (c & 0x3f);
return 4;
} else if (c < 0x4000000) { // 26 bits
buf[0] = 0xf8 + ((unsigned)c >> 24);
buf[1] = 0x80 + (((unsigned)c >> 18) & 0x3f);
buf[2] = 0x80 + (((unsigned)c >> 12) & 0x3f);
buf[3] = 0x80 + (((unsigned)c >> 6) & 0x3f);
buf[4] = 0x80 + (c & 0x3f);
return 5;
} else { // 31 bits
buf[0] = 0xfc + ((unsigned)c >> 30);
buf[1] = 0x80 + (((unsigned)c >> 24) & 0x3f);
buf[2] = 0x80 + (((unsigned)c >> 18) & 0x3f);
buf[3] = 0x80 + (((unsigned)c >> 12) & 0x3f);
buf[4] = 0x80 + (((unsigned)c >> 6) & 0x3f);
buf[5] = 0x80 + (c & 0x3f);
return 6;
}
}
/*
* Return true if "c" is a composing UTF-8 character. This means it will be
* drawn on top of the preceding character.
* Based on code from Markus Kuhn.
*/
bool utf_iscomposing(int c)
{
return intable(combining, ARRAY_SIZE(combining), c);
}
/*
* Return true for characters that can be displayed in a normal way.
* Only for characters of 0x100 and above!
*/
bool utf_printable(int c)
{
#ifdef USE_WCHAR_FUNCTIONS
/*
* Assume the iswprint() library function works better than our own stuff.
*/
return iswprint(c);
#else
/* Sorted list of non-overlapping intervals.
* 0xd800-0xdfff is reserved for UTF-16, actually illegal. */
static struct interval nonprint[] =
{
{0x070f, 0x070f}, {0x180b, 0x180e}, {0x200b, 0x200f}, {0x202a, 0x202e},
{0x206a, 0x206f}, {0xd800, 0xdfff}, {0xfeff, 0xfeff}, {0xfff9, 0xfffb},
{0xfffe, 0xffff}
};
return !intable(nonprint, ARRAY_SIZE(nonprint), c);
#endif
}
/*
* Get class of a Unicode character.
* 0: white space
* 1: punctuation
* 2 or bigger: some class of word character.
*/
int utf_class(const int c)
{
return utf_class_tab(c, curbuf->b_chartab);
}
int utf_class_tab(const int c, const uint64_t *const chartab)
{
/* sorted list of non-overlapping intervals */
static struct clinterval {
unsigned int first;
unsigned int last;
unsigned int class;
} classes[] =
{
{0x037e, 0x037e, 1}, /* Greek question mark */
{0x0387, 0x0387, 1}, /* Greek ano teleia */
{0x055a, 0x055f, 1}, /* Armenian punctuation */
{0x0589, 0x0589, 1}, /* Armenian full stop */
{0x05be, 0x05be, 1},
{0x05c0, 0x05c0, 1},
{0x05c3, 0x05c3, 1},
{0x05f3, 0x05f4, 1},
{0x060c, 0x060c, 1},
{0x061b, 0x061b, 1},
{0x061f, 0x061f, 1},
{0x066a, 0x066d, 1},
{0x06d4, 0x06d4, 1},
{0x0700, 0x070d, 1}, /* Syriac punctuation */
{0x0964, 0x0965, 1},
{0x0970, 0x0970, 1},
{0x0df4, 0x0df4, 1},
{0x0e4f, 0x0e4f, 1},
{0x0e5a, 0x0e5b, 1},
{0x0f04, 0x0f12, 1},
{0x0f3a, 0x0f3d, 1},
{0x0f85, 0x0f85, 1},
{0x104a, 0x104f, 1}, /* Myanmar punctuation */
{0x10fb, 0x10fb, 1}, /* Georgian punctuation */
{0x1361, 0x1368, 1}, /* Ethiopic punctuation */
{0x166d, 0x166e, 1}, /* Canadian Syl. punctuation */
{0x1680, 0x1680, 0},
{0x169b, 0x169c, 1},
{0x16eb, 0x16ed, 1},
{0x1735, 0x1736, 1},
{0x17d4, 0x17dc, 1}, /* Khmer punctuation */
{0x1800, 0x180a, 1}, /* Mongolian punctuation */
{0x2000, 0x200b, 0}, /* spaces */
{0x200c, 0x2027, 1}, /* punctuation and symbols */
{0x2028, 0x2029, 0},
{0x202a, 0x202e, 1}, /* punctuation and symbols */
{0x202f, 0x202f, 0},
{0x2030, 0x205e, 1}, /* punctuation and symbols */
{0x205f, 0x205f, 0},
{0x2060, 0x27ff, 1}, /* punctuation and symbols */
{0x2070, 0x207f, 0x2070}, /* superscript */
{0x2080, 0x2094, 0x2080}, /* subscript */
{0x20a0, 0x27ff, 1}, /* all kinds of symbols */
{0x2800, 0x28ff, 0x2800}, /* braille */
{0x2900, 0x2998, 1}, /* arrows, brackets, etc. */
{0x29d8, 0x29db, 1},
{0x29fc, 0x29fd, 1},
{0x2e00, 0x2e7f, 1}, /* supplemental punctuation */
{0x3000, 0x3000, 0}, /* ideographic space */
{0x3001, 0x3020, 1}, /* ideographic punctuation */
{0x3030, 0x3030, 1},
{0x303d, 0x303d, 1},
{0x3040, 0x309f, 0x3040}, /* Hiragana */
{0x30a0, 0x30ff, 0x30a0}, /* Katakana */
{0x3300, 0x9fff, 0x4e00}, /* CJK Ideographs */
{0xac00, 0xd7a3, 0xac00}, /* Hangul Syllables */
{0xf900, 0xfaff, 0x4e00}, /* CJK Ideographs */
{0xfd3e, 0xfd3f, 1},
{0xfe30, 0xfe6b, 1}, /* punctuation forms */
{0xff00, 0xff0f, 1}, /* half/fullwidth ASCII */
{0xff1a, 0xff20, 1}, /* half/fullwidth ASCII */
{0xff3b, 0xff40, 1}, /* half/fullwidth ASCII */
{0xff5b, 0xff65, 1}, /* half/fullwidth ASCII */
{0x20000, 0x2a6df, 0x4e00}, /* CJK Ideographs */
{0x2a700, 0x2b73f, 0x4e00}, /* CJK Ideographs */
{0x2b740, 0x2b81f, 0x4e00}, /* CJK Ideographs */
{0x2f800, 0x2fa1f, 0x4e00}, /* CJK Ideographs */
};
int bot = 0;
int top = ARRAY_SIZE(classes) - 1;
int mid;
/* First quick check for Latin1 characters, use 'iskeyword'. */
if (c < 0x100) {
if (c == ' ' || c == '\t' || c == NUL || c == 0xa0) {
return 0; // blank
}
if (vim_iswordc_tab(c, chartab)) {
return 2; // word character
}
return 1; // punctuation
}
/* binary search in table */
while (top >= bot) {
mid = (bot + top) / 2;
if (classes[mid].last < (unsigned int)c)
bot = mid + 1;
else if (classes[mid].first > (unsigned int)c)
top = mid - 1;
else
return (int)classes[mid].class;
}
// emoji
if (intable(emoji_all, ARRAY_SIZE(emoji_all), c)) {
return 3;
}
/* most other characters are "word" characters */
return 2;
}
bool utf_ambiguous_width(int c)
{
return c >= 0x80 && (intable(ambiguous, ARRAY_SIZE(ambiguous), c)
|| intable(emoji_all, ARRAY_SIZE(emoji_all), c));
}
/*
* Generic conversion function for case operations.
* Return the converted equivalent of "a", which is a UCS-4 character. Use
* the given conversion "table". Uses binary search on "table".
*/
static int utf_convert(int a, const convertStruct *const table, size_t n_items)
{
size_t start, mid, end; /* indices into table */
start = 0;
end = n_items;
while (start < end) {
/* need to search further */
mid = (end + start) / 2;
if (table[mid].rangeEnd < a)
start = mid + 1;
else
end = mid;
}
if (start < n_items
&& table[start].rangeStart <= a
&& a <= table[start].rangeEnd
&& (a - table[start].rangeStart) % table[start].step == 0)
return a + table[start].offset;
else
return a;
}
/*
* Return the folded-case equivalent of "a", which is a UCS-4 character. Uses
* simple case folding.
*/
int utf_fold(int a)
{
if (a < 0x80) {
// be fast for ASCII
return a >= 0x41 && a <= 0x5a ? a + 32 : a;
}
return utf_convert(a, foldCase, ARRAY_SIZE(foldCase));
}
// Vim's own character class functions. These exist because many library
// islower()/toupper() etc. do not work properly: they crash when used with
// invalid values or can't handle latin1 when the locale is C.
// Speed is most important here.
/// Return the upper-case equivalent of "a", which is a UCS-4 character. Use
/// simple case folding.
int mb_toupper(int a)
{
/* If 'casemap' contains "keepascii" use ASCII style toupper(). */
if (a < 128 && (cmp_flags & CMP_KEEPASCII))
return TOUPPER_ASC(a);
#if defined(__STDC_ISO_10646__)
/* If towupper() is available and handles Unicode, use it. */
if (!(cmp_flags & CMP_INTERNAL))
return towupper(a);
#endif
/* For characters below 128 use locale sensitive toupper(). */
if (a < 128)
return TOUPPER_LOC(a);
/* For any other characters use the above mapping table. */
return utf_convert(a, toUpper, ARRAY_SIZE(toUpper));
}
bool mb_islower(int a)
{
// German sharp s is lower case but has no upper case equivalent.
return (mb_toupper(a) != a) || a == 0xdf;
}
/// Return the lower-case equivalent of "a", which is a UCS-4 character. Use
/// simple case folding.
int mb_tolower(int a)
{
/* If 'casemap' contains "keepascii" use ASCII style tolower(). */
if (a < 128 && (cmp_flags & CMP_KEEPASCII))
return TOLOWER_ASC(a);
#if defined(__STDC_ISO_10646__)
/* If towlower() is available and handles Unicode, use it. */
if (!(cmp_flags & CMP_INTERNAL))
return towlower(a);
#endif
/* For characters below 128 use locale sensitive tolower(). */
if (a < 128)
return TOLOWER_LOC(a);
/* For any other characters use the above mapping table. */
return utf_convert(a, toLower, ARRAY_SIZE(toLower));
}
bool mb_isupper(int a)
{
return mb_tolower(a) != a;
}
static int utf_strnicmp(const char_u *s1, const char_u *s2, size_t n1,
size_t n2)
{
int c1, c2, cdiff;
char_u buffer[6];
for (;; ) {
c1 = utf_safe_read_char_adv(&s1, &n1);
c2 = utf_safe_read_char_adv(&s2, &n2);
if (c1 <= 0 || c2 <= 0)
break;
if (c1 == c2)
continue;
cdiff = utf_fold(c1) - utf_fold(c2);
if (cdiff != 0)
return cdiff;
}
/* some string ended or has an incomplete/illegal character sequence */
if (c1 == 0 || c2 == 0) {
/* some string ended. shorter string is smaller */
if (c1 == 0 && c2 == 0)
return 0;
return c1 == 0 ? -1 : 1;
}
/* Continue with bytewise comparison to produce some result that
* would make comparison operations involving this function transitive.
*
* If only one string had an error, comparison should be made with
* folded version of the other string. In this case it is enough
* to fold just one character to determine the result of comparison. */
if (c1 != -1 && c2 == -1) {
n1 = utf_char2bytes(utf_fold(c1), buffer);
s1 = buffer;
} else if (c2 != -1 && c1 == -1) {
n2 = utf_char2bytes(utf_fold(c2), buffer);
s2 = buffer;
}
while (n1 > 0 && n2 > 0 && *s1 != NUL && *s2 != NUL) {
cdiff = (int)(*s1) - (int)(*s2);
if (cdiff != 0)
return cdiff;
s1++;
s2++;
n1--;
n2--;
}
if (n1 > 0 && *s1 == NUL)
n1 = 0;
if (n2 > 0 && *s2 == NUL)
n2 = 0;
if (n1 == 0 && n2 == 0)
return 0;
return n1 == 0 ? -1 : 1;
}
#ifdef WIN32
#ifndef CP_UTF8
# define CP_UTF8 65001 /* magic number from winnls.h */
#endif
/// Reassigns `strw` to a new, allocated pointer to a UTF16 string.
int utf8_to_utf16(const char *str, wchar_t **strw)
FUNC_ATTR_NONNULL_ALL
{
ssize_t wchar_len = 0;
// Compute the length needed to store the converted widechar string.
wchar_len = MultiByteToWideChar(CP_UTF8,
0, // dwFlags: must be 0 for utf8
str, // lpMultiByteStr: string to convert
-1, // -1 => process up to NUL
NULL, // lpWideCharStr: converted string
0); // 0 => return length, don't convert
if (wchar_len == 0) {
return GetLastError();
}
ssize_t buf_sz = wchar_len * sizeof(wchar_t);
if (buf_sz == 0) {
*strw = NULL;
return 0;
}
char *buf = xmalloc(buf_sz);
char *pos = buf;
int r = MultiByteToWideChar(CP_UTF8,
0,
str,
-1,
(wchar_t *)pos,
wchar_len);
assert(r == wchar_len);
if (r != wchar_len) {
EMSG2("MultiByteToWideChar failed: %d", r);
}
*strw = (wchar_t *)pos;
return 0;
}
/// Reassigns `str` to a new, allocated pointer to a UTF8 string.
int utf16_to_utf8(const wchar_t *strw, char **str)
FUNC_ATTR_NONNULL_ALL
{
// Compute the space required to store the string as UTF-8.
DWORD utf8_len = WideCharToMultiByte(CP_UTF8,
0,
strw,
-1,
NULL,
0,
NULL,
NULL);
if (utf8_len == 0) {
return GetLastError();
}
*str = xmallocz(utf8_len);
// Convert to UTF-8.
utf8_len = WideCharToMultiByte(CP_UTF8,
0,
strw,
-1,
*str,
utf8_len,
NULL,
NULL);
if (utf8_len == 0) {
free(*str);
*str = NULL;
return GetLastError();
}
(*str)[utf8_len] = '\0';
return 0;
}
#endif
/*
* Version of strnicmp() that handles multi-byte characters.
* Needed for Big5, Shift-JIS and UTF-8 encoding. Other DBCS encodings can
* probably use strnicmp(), because there are no ASCII characters in the
* second byte.
* Returns zero if s1 and s2 are equal (ignoring case), the difference between
* two characters otherwise.
*/
int mb_strnicmp(const char_u *s1, const char_u *s2, const size_t nn)
{
return utf_strnicmp(s1, s2, nn, nn);
}
/// Compare strings case-insensitively
///
/// @note We need to call mb_stricmp() even when we aren't dealing with
/// a multi-byte encoding because mb_stricmp() takes care of all ASCII and
/// non-ascii encodings, including characters with umlauts in latin1,
/// etc., while STRICMP() only handles the system locale version, which
/// often does not handle non-ascii properly.
///
/// @param[in] s1 First string to compare, not more then #MAXCOL characters.
/// @param[in] s2 Second string to compare, not more then #MAXCOL characters.
///
/// @return 0 if strings are equal, <0 if s1 < s2, >0 if s1 > s2.
int mb_stricmp(const char *s1, const char *s2)
{
return mb_strnicmp((const char_u *)s1, (const char_u *)s2, MAXCOL);
}
/*
* "g8": show bytes of the UTF-8 char under the cursor. Doesn't matter what
* 'encoding' has been set to.
*/
void show_utf8(void)
{
int len;
int rlen = 0;
char_u *line;
int clen;
int i;
/* Get the byte length of the char under the cursor, including composing
* characters. */
line = get_cursor_pos_ptr();
len = utfc_ptr2len(line);
if (len == 0) {
MSG("NUL");
return;
}
clen = 0;
for (i = 0; i < len; ++i) {
if (clen == 0) {
/* start of (composing) character, get its length */
if (i > 0) {
STRCPY(IObuff + rlen, "+ ");
rlen += 2;
}
clen = utf_ptr2len(line + i);
}
sprintf((char *)IObuff + rlen, "%02x ",
(line[i] == NL) ? NUL : line[i]); /* NUL is stored as NL */
--clen;
rlen += (int)STRLEN(IObuff + rlen);
if (rlen > IOSIZE - 20)
break;
}
msg(IObuff);
}
/// Return offset from "p" to the first byte of the character it points into.
/// If "p" points to the NUL at the end of the string return 0.
/// Returns 0 when already at the first byte of a character.
int utf_head_off(const char_u *base, const char_u *p)
{
int c;
int len;
if (*p < 0x80) /* be quick for ASCII */
return 0;
/* Skip backwards over trailing bytes: 10xx.xxxx
* Skip backwards again if on a composing char. */
const char_u *q;
for (q = p;; --q) {
/* Move s to the last byte of this char. */
const char_u *s;
for (s = q; (s[1] & 0xc0) == 0x80; ++s) {}
/* Move q to the first byte of this char. */
while (q > base && (*q & 0xc0) == 0x80)
--q;
/* Check for illegal sequence. Do allow an illegal byte after where we
* started. */
len = utf8len_tab[*q];
if (len != (int)(s - q + 1) && len != (int)(p - q + 1))
return 0;
if (q <= base)
break;
c = utf_ptr2char(q);
if (utf_iscomposing(c))
continue;
if (arabic_maycombine(c)) {
/* Advance to get a sneak-peak at the next char */
const char_u *j = q;
--j;
/* Move j to the first byte of this char. */
while (j > base && (*j & 0xc0) == 0x80)
--j;
if (arabic_combine(utf_ptr2char(j), c))
continue;
}
break;
}
return (int)(p - q);
}
/// Copy a character, advancing the pointers
///
/// @param[in,out] fp Source of the character to copy.
/// @param[in,out] tp Destination to copy to.
void mb_copy_char(const char_u **const fp, char_u **const tp)
{
const size_t l = (size_t)utfc_ptr2len(*fp);
memmove(*tp, *fp, l);
*tp += l;
*fp += l;
}
/*
* Return the offset from "p" to the first byte of a character. When "p" is
* at the start of a character 0 is returned, otherwise the offset to the next
* character. Can start anywhere in a stream of bytes.
*/
int mb_off_next(char_u *base, char_u *p)
{
int i;
int j;
if (*p < 0x80) { // be quick for ASCII
return 0;
}
// Find the next character that isn't 10xx.xxxx
for (i = 0; (p[i] & 0xc0) == 0x80; i++) {}
if (i > 0) {
// Check for illegal sequence.
for (j = 0; p - j > base; j++) {
if ((p[-j] & 0xc0) != 0x80) {
break;
}
}
if (utf8len_tab[p[-j]] != i + j) {
return 0;
}
}
return i;
}
/*
* Return the offset from "p" to the last byte of the character it points
* into. Can start anywhere in a stream of bytes.
*/
int mb_tail_off(char_u *base, char_u *p)
{
int i;
int j;
if (*p == NUL)
return 0;
// Find the last character that is 10xx.xxxx
for (i = 0; (p[i + 1] & 0xc0) == 0x80; i++) {}
// Check for illegal sequence.
for (j = 0; p - j > base; j++) {
if ((p[-j] & 0xc0) != 0x80) {
break;
}
}
if (utf8len_tab[p[-j]] != i + j + 1) {
return 0;
}
return i;
}
/*
* Find the next illegal byte sequence.
*/
void utf_find_illegal(void)
{
pos_T pos = curwin->w_cursor;
char_u *p;
int len;
vimconv_T vimconv;
char_u *tofree = NULL;
vimconv.vc_type = CONV_NONE;
if (enc_canon_props(curbuf->b_p_fenc) & ENC_8BIT) {
// 'encoding' is "utf-8" but we are editing a 8-bit encoded file,
// possibly a utf-8 file with illegal bytes. Setup for conversion
// from utf-8 to 'fileencoding'.
convert_setup(&vimconv, p_enc, curbuf->b_p_fenc);
}
curwin->w_cursor.coladd = 0;
for (;; ) {
p = get_cursor_pos_ptr();
if (vimconv.vc_type != CONV_NONE) {
xfree(tofree);
tofree = string_convert(&vimconv, p, NULL);
if (tofree == NULL)
break;
p = tofree;
}
while (*p != NUL) {
/* Illegal means that there are not enough trail bytes (checked by
* utf_ptr2len()) or too many of them (overlong sequence). */
len = utf_ptr2len(p);
if (*p >= 0x80 && (len == 1
|| utf_char2len(utf_ptr2char(p)) != len)) {
if (vimconv.vc_type == CONV_NONE)
curwin->w_cursor.col += (colnr_T)(p - get_cursor_pos_ptr());
else {
int l;
len = (int)(p - tofree);
for (p = get_cursor_pos_ptr(); *p != NUL && len-- > 0; p += l) {
l = utf_ptr2len(p);
curwin->w_cursor.col += l;
}
}
goto theend;
}
p += len;
}
if (curwin->w_cursor.lnum == curbuf->b_ml.ml_line_count)
break;
++curwin->w_cursor.lnum;
curwin->w_cursor.col = 0;
}
/* didn't find it: don't move and beep */
curwin->w_cursor = pos;
beep_flush();
theend:
xfree(tofree);
convert_setup(&vimconv, NULL, NULL);
}
/*
* If the cursor moves on an trail byte, set the cursor on the lead byte.
* Thus it moves left if necessary.
*/
void mb_adjust_cursor(void)
{
mark_mb_adjustpos(curbuf, &curwin->w_cursor);
}
/// Checks and adjusts cursor column. Not mode-dependent.
/// @see check_cursor_col_win
///
/// @param win_ Places cursor on a valid column for this window.
void mb_check_adjust_col(void *win_)
{
win_T *win = (win_T *)win_;
colnr_T oldcol = win->w_cursor.col;
// Column 0 is always valid.
if (oldcol != 0) {
char_u *p = ml_get_buf(win->w_buffer, win->w_cursor.lnum, false);
colnr_T len = (colnr_T)STRLEN(p);
// Empty line or invalid column?
if (len == 0 || oldcol < 0) {
win->w_cursor.col = 0;
} else {
// Cursor column too big for line?
if (oldcol > len) {
win->w_cursor.col = len - 1;
}
// Move the cursor to the head byte.
win->w_cursor.col -= utf_head_off(p, p + win->w_cursor.col);
}
// Reset `coladd` when the cursor would be on the right half of a
// double-wide character.
if (win->w_cursor.coladd == 1 && p[win->w_cursor.col] != TAB
&& vim_isprintc(utf_ptr2char(p + win->w_cursor.col))
&& ptr2cells(p + win->w_cursor.col) > 1) {
win->w_cursor.coladd = 0;
}
}
}
/*
* Return a pointer to the character before "*p", if there is one.
*/
char_u * mb_prevptr(
char_u *line, /* start of the string */
char_u *p
)
{
if (p > line) {
MB_PTR_BACK(line, p);
}
return p;
}
/*
* Return the character length of "str". Each multi-byte character (with
* following composing characters) counts as one.
*/
int mb_charlen(char_u *str)
{
char_u *p = str;
int count;
if (p == NULL)
return 0;
for (count = 0; *p != NUL; count++)
p += (*mb_ptr2len)(p);
return count;
}
/*
* Like mb_charlen() but for a string with specified length.
*/
int mb_charlen_len(char_u *str, int len)
{
char_u *p = str;
int count;
for (count = 0; *p != NUL && p < str + len; count++)
p += (*mb_ptr2len)(p);
return count;
}
/// Try to unescape a multibyte character
///
/// Used for the rhs and lhs of the mappings.
///
/// @param[in,out] pp String to unescape. Is advanced to just after the bytes
/// that form a multibyte character.
///
/// @return Unescaped string if it is a multibyte character, NULL if no
/// multibyte character was found. Returns a static buffer, always one
/// and the same.
const char *mb_unescape(const char **const pp)
FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
{
static char buf[6];
size_t buf_idx = 0;
uint8_t *str = (uint8_t *)(*pp);
// Must translate K_SPECIAL KS_SPECIAL KE_FILLER to K_SPECIAL and CSI
// KS_EXTRA KE_CSI to CSI.
// Maximum length of a utf-8 character is 4 bytes.
for (size_t str_idx = 0; str[str_idx] != NUL && buf_idx < 4; str_idx++) {
if (str[str_idx] == K_SPECIAL
&& str[str_idx + 1] == KS_SPECIAL
&& str[str_idx + 2] == KE_FILLER) {
buf[buf_idx++] = (char)K_SPECIAL;
str_idx += 2;
} else if ((str[str_idx] == K_SPECIAL)
&& str[str_idx + 1] == KS_EXTRA
&& str[str_idx + 2] == KE_CSI) {
buf[buf_idx++] = (char)CSI;
str_idx += 2;
} else if (str[str_idx] == K_SPECIAL) {
break; // A special key can't be a multibyte char.
} else {
buf[buf_idx++] = (char)str[str_idx];
}
buf[buf_idx] = NUL;
// Return a multi-byte character if it's found. An illegal sequence
// will result in a 1 here.
if (utf_ptr2len((const char_u *)buf) > 1) {
*pp = (const char *)str + str_idx + 1;
return buf;
}
// Bail out quickly for ASCII.
if ((uint8_t)buf[0] < 128) {
break;
}
}
return NULL;
}
/*
* Return true if the character at "row"/"col" on the screen is the left side
* of a double-width character.
* Caller must make sure "row" and "col" are not invalid!
*/
bool mb_lefthalve(int row, int col)
{
return utf_off2cells(LineOffset[row] + col,
LineOffset[row] + screen_Columns) > 1;
}
/*
* Correct a position on the screen, if it's the right half of a double-wide
* char move it to the left half. Returns the corrected column.
*/
int mb_fix_col(int col, int row)
{
col = check_col(col);
row = check_row(row);
if (ScreenLines != NULL && col > 0
&& ScreenLines[LineOffset[row] + col][0] == 0) {
return col - 1;
}
return col;
}
/*
* Skip the Vim specific head of a 'encoding' name.
*/
char_u * enc_skip(char_u *p)
{
if (STRNCMP(p, "2byte-", 6) == 0)
return p + 6;
if (STRNCMP(p, "8bit-", 5) == 0)
return p + 5;
return p;
}
/*
* Find the canonical name for encoding "enc".
* When the name isn't recognized, returns "enc" itself, but with all lower
* case characters and '_' replaced with '-'.
* Returns an allocated string.
*/
char_u *enc_canonize(char_u *enc) FUNC_ATTR_NONNULL_RET
{
char_u *p, *s;
int i;
if (STRCMP(enc, "default") == 0) {
// Use the default encoding as found by set_init_1().
return vim_strsave(fenc_default);
}
/* copy "enc" to allocated memory, with room for two '-' */
char_u *r = xmalloc(STRLEN(enc) + 3);
/* Make it all lower case and replace '_' with '-'. */
p = r;
for (s = enc; *s != NUL; ++s) {
if (*s == '_')
*p++ = '-';
else
*p++ = TOLOWER_ASC(*s);
}
*p = NUL;
/* Skip "2byte-" and "8bit-". */
p = enc_skip(r);
/* Change "microsoft-cp" to "cp". Used in some spell files. */
if (STRNCMP(p, "microsoft-cp", 12) == 0)
STRMOVE(p, p + 10);
/* "iso8859" -> "iso-8859" */
if (STRNCMP(p, "iso8859", 7) == 0) {
STRMOVE(p + 4, p + 3);
p[3] = '-';
}
/* "iso-8859n" -> "iso-8859-n" */
if (STRNCMP(p, "iso-8859", 8) == 0 && p[8] != '-') {
STRMOVE(p + 9, p + 8);
p[8] = '-';
}
/* "latin-N" -> "latinN" */
if (STRNCMP(p, "latin-", 6) == 0)
STRMOVE(p + 5, p + 6);
if (enc_canon_search(p) >= 0) {
/* canonical name can be used unmodified */
if (p != r)
STRMOVE(r, p);
} else if ((i = enc_alias_search(p)) >= 0) {
/* alias recognized, get canonical name */
xfree(r);
r = vim_strsave((char_u *)enc_canon_table[i].name);
}
return r;
}
/*
* Search for an encoding alias of "name".
* Returns -1 when not found.
*/
static int enc_alias_search(char_u *name)
{
int i;
for (i = 0; enc_alias_table[i].name != NULL; ++i)
if (STRCMP(name, enc_alias_table[i].name) == 0)
return enc_alias_table[i].canon;
return -1;
}
#ifdef HAVE_LANGINFO_H
# include <langinfo.h>
#endif
/*
* Get the canonicalized encoding of the current locale.
* Returns an allocated string when successful, NULL when not.
*/
char_u * enc_locale(void)
{
int i;
char buf[50];
const char *s;
# ifdef HAVE_NL_LANGINFO_CODESET
if (!(s = nl_langinfo(CODESET)) || *s == NUL)
# endif
{
# if defined(HAVE_LOCALE_H)
if (!(s = setlocale(LC_CTYPE, NULL)) || *s == NUL)
# endif
{
if ((s = os_getenv("LC_ALL"))) {
if ((s = os_getenv("LC_CTYPE"))) {
s = os_getenv("LANG");
}
}
}
}
if (!s) {
return NULL;
}
// The most generic locale format is:
// language[_territory][.codeset][@modifier][+special][,[sponsor][_revision]]
// If there is a '.' remove the part before it.
// if there is something after the codeset, remove it.
// Make the name lowercase and replace '_' with '-'.
// Exception: "ja_JP.EUC" == "euc-jp", "zh_CN.EUC" = "euc-cn",
// "ko_KR.EUC" == "euc-kr"
const char *p = (char *)vim_strchr((char_u *)s, '.');
if (p != NULL) {
if (p > s + 2 && !STRNICMP(p + 1, "EUC", 3)
&& !isalnum((int)p[4]) && p[4] != '-' && p[-3] == '_') {
// Copy "XY.EUC" to "euc-XY" to buf[10].
memmove(buf, "euc-", 4);
buf[4] = (ASCII_ISALNUM(p[-2]) ? TOLOWER_ASC(p[-2]) : 0);
buf[5] = (ASCII_ISALNUM(p[-1]) ? TOLOWER_ASC(p[-1]) : 0);
buf[6] = NUL;
} else {
s = p + 1;
goto enc_locale_copy_enc;
}
} else {
enc_locale_copy_enc:
for (i = 0; i < (int)sizeof(buf) - 1 && s[i] != NUL; i++) {
if (s[i] == '_' || s[i] == '-') {
buf[i] = '-';
} else if (ASCII_ISALNUM((uint8_t)s[i])) {
buf[i] = TOLOWER_ASC(s[i]);
} else {
break;
}
}
buf[i] = NUL;
}
return enc_canonize((char_u *)buf);
}
# if defined(USE_ICONV)
/*
* Call iconv_open() with a check if iconv() works properly (there are broken
* versions).
* Returns (void *)-1 if failed.
* (should return iconv_t, but that causes problems with prototypes).
*/
void * my_iconv_open(char_u *to, char_u *from)
{
iconv_t fd;
#define ICONV_TESTLEN 400
char_u tobuf[ICONV_TESTLEN];
char *p;
size_t tolen;
static WorkingStatus iconv_working = kUnknown;
if (iconv_working == kBroken)
return (void *)-1; /* detected a broken iconv() previously */
#ifdef DYNAMIC_ICONV
// Check if the iconv.dll can be found.
if (!iconv_enabled(true)) {
return (void *)-1;
}
#endif
fd = iconv_open((char *)enc_skip(to), (char *)enc_skip(from));
if (fd != (iconv_t)-1 && iconv_working == kUnknown) {
/*
* Do a dummy iconv() call to check if it actually works. There is a
* version of iconv() on Linux that is broken. We can't ignore it,
* because it's wide-spread. The symptoms are that after outputting
* the initial shift state the "to" pointer is NULL and conversion
* stops for no apparent reason after about 8160 characters.
*/
p = (char *)tobuf;
tolen = ICONV_TESTLEN;
(void)iconv(fd, NULL, NULL, &p, &tolen);
if (p == NULL) {
iconv_working = kBroken;
iconv_close(fd);
fd = (iconv_t)-1;
} else
iconv_working = kWorking;
}
return (void *)fd;
}
/*
* Convert the string "str[slen]" with iconv().
* If "unconvlenp" is not NULL handle the string ending in an incomplete
* sequence and set "*unconvlenp" to the length of it.
* Returns the converted string in allocated memory. NULL for an error.
* If resultlenp is not NULL, sets it to the result length in bytes.
*/
static char_u *iconv_string(const vimconv_T *const vcp, char_u *str,
size_t slen, size_t *unconvlenp, size_t *resultlenp)
{
const char *from;
size_t fromlen;
char *to;
size_t tolen;
size_t len = 0;
size_t done = 0;
char_u *result = NULL;
char_u *p;
int l;
from = (char *)str;
fromlen = slen;
for (;; ) {
if (len == 0 || ICONV_ERRNO == ICONV_E2BIG) {
/* Allocate enough room for most conversions. When re-allocating
* increase the buffer size. */
len = len + fromlen * 2 + 40;
p = xmalloc(len);
if (done > 0)
memmove(p, result, done);
xfree(result);
result = p;
}
to = (char *)result + done;
tolen = len - done - 2;
/* Avoid a warning for systems with a wrong iconv() prototype by
* casting the second argument to void *. */
if (iconv(vcp->vc_fd, (void *)&from, &fromlen, &to, &tolen) != SIZE_MAX) {
/* Finished, append a NUL. */
*to = NUL;
break;
}
/* Check both ICONV_EINVAL and EINVAL, because the dynamically loaded
* iconv library may use one of them. */
if (!vcp->vc_fail && unconvlenp != NULL
&& (ICONV_ERRNO == ICONV_EINVAL || ICONV_ERRNO == EINVAL)) {
/* Handle an incomplete sequence at the end. */
*to = NUL;
*unconvlenp = fromlen;
break;
}
/* Check both ICONV_EILSEQ and EILSEQ, because the dynamically loaded
* iconv library may use one of them. */
else if (!vcp->vc_fail
&& (ICONV_ERRNO == ICONV_EILSEQ || ICONV_ERRNO == EILSEQ
|| ICONV_ERRNO == ICONV_EINVAL || ICONV_ERRNO == EINVAL)) {
/* Can't convert: insert a '?' and skip a character. This assumes
* conversion from 'encoding' to something else. In other
* situations we don't know what to skip anyway. */
*to++ = '?';
if ((*mb_ptr2cells)((char_u *)from) > 1)
*to++ = '?';
l = utfc_ptr2len_len((const char_u *)from, (int)fromlen);
from += l;
fromlen -= l;
} else if (ICONV_ERRNO != ICONV_E2BIG) {
/* conversion failed */
xfree(result);
result = NULL;
break;
}
/* Not enough room or skipping illegal sequence. */
done = to - (char *)result;
}
if (resultlenp != NULL && result != NULL)
*resultlenp = (size_t)(to - (char *)result);
return result;
}
# if defined(DYNAMIC_ICONV)
/*
* Dynamically load the "iconv.dll" on Win32.
*/
#ifndef DYNAMIC_ICONV /* just generating prototypes */
# define HINSTANCE int
#endif
static HINSTANCE hIconvDLL = 0;
static HINSTANCE hMsvcrtDLL = 0;
# ifndef DYNAMIC_ICONV_DLL
# define DYNAMIC_ICONV_DLL "iconv.dll"
# define DYNAMIC_ICONV_DLL_ALT "libiconv-2.dll"
# endif
# ifndef DYNAMIC_MSVCRT_DLL
# define DYNAMIC_MSVCRT_DLL "msvcrt.dll"
# endif
/*
* Get the address of 'funcname' which is imported by 'hInst' DLL.
*/
static void * get_iconv_import_func(HINSTANCE hInst,
const char *funcname)
{
PBYTE pImage = (PBYTE)hInst;
PIMAGE_DOS_HEADER pDOS = (PIMAGE_DOS_HEADER)hInst;
PIMAGE_NT_HEADERS pPE;
PIMAGE_IMPORT_DESCRIPTOR pImpDesc;
PIMAGE_THUNK_DATA pIAT; /* Import Address Table */
PIMAGE_THUNK_DATA pINT; /* Import Name Table */
PIMAGE_IMPORT_BY_NAME pImpName;
if (pDOS->e_magic != IMAGE_DOS_SIGNATURE)
return NULL;
pPE = (PIMAGE_NT_HEADERS)(pImage + pDOS->e_lfanew);
if (pPE->Signature != IMAGE_NT_SIGNATURE)
return NULL;
pImpDesc = (PIMAGE_IMPORT_DESCRIPTOR)(pImage
+ pPE->OptionalHeader.DataDirectory[
IMAGE_DIRECTORY_ENTRY_IMPORT]
.VirtualAddress);
for (; pImpDesc->FirstThunk; ++pImpDesc) {
if (!pImpDesc->OriginalFirstThunk)
continue;
pIAT = (PIMAGE_THUNK_DATA)(pImage + pImpDesc->FirstThunk);
pINT = (PIMAGE_THUNK_DATA)(pImage + pImpDesc->OriginalFirstThunk);
for (; pIAT->u1.Function; ++pIAT, ++pINT) {
if (IMAGE_SNAP_BY_ORDINAL(pINT->u1.Ordinal))
continue;
pImpName = (PIMAGE_IMPORT_BY_NAME)(pImage
+ (UINT_PTR)(pINT->u1.AddressOfData));
if (strcmp(pImpName->Name, funcname) == 0)
return (void *)pIAT->u1.Function;
}
}
return NULL;
}
// Load library "name".
HINSTANCE vimLoadLib(char *name)
{
HINSTANCE dll = NULL;
// NOTE: Do not use mch_dirname() and mch_chdir() here, they may call
// vimLoadLib() recursively, which causes a stack overflow.
wchar_t old_dirw[MAXPATHL];
// Path to exe dir.
char *buf = xstrdup((char *)get_vim_var_str(VV_PROGPATH));
// ptrdiff_t len = ;
// assert(len > 0);
buf[path_tail_with_sep(buf) - buf] = '\0';
if (GetCurrentDirectoryW(MAXPATHL, old_dirw) != 0) {
// Change directory to where the executable is, both to make
// sure we find a .dll there and to avoid looking for a .dll
// in the current directory.
SetCurrentDirectory((LPCSTR)buf);
// TODO(justinmk): use uv_dlopen instead. see os_libcall
dll = LoadLibrary(name);
SetCurrentDirectoryW(old_dirw);
}
return dll;
}
/*
* Try opening the iconv.dll and return TRUE if iconv() can be used.
*/
bool iconv_enabled(bool verbose)
{
if (hIconvDLL != 0 && hMsvcrtDLL != 0)
return true;
hIconvDLL = vimLoadLib(DYNAMIC_ICONV_DLL);
if (hIconvDLL == 0) /* sometimes it's called libiconv.dll */
hIconvDLL = vimLoadLib(DYNAMIC_ICONV_DLL_ALT);
if (hIconvDLL != 0)
hMsvcrtDLL = vimLoadLib(DYNAMIC_MSVCRT_DLL);
if (hIconvDLL == 0 || hMsvcrtDLL == 0) {
/* Only give the message when 'verbose' is set, otherwise it might be
* done whenever a conversion is attempted. */
if (verbose && p_verbose > 0) {
verbose_enter();
EMSG2(_(e_loadlib),
hIconvDLL == 0 ? DYNAMIC_ICONV_DLL : DYNAMIC_MSVCRT_DLL);
verbose_leave();
}
iconv_end();
return false;
}
iconv = (void *)GetProcAddress(hIconvDLL, "libiconv");
iconv_open = (void *)GetProcAddress(hIconvDLL, "libiconv_open");
iconv_close = (void *)GetProcAddress(hIconvDLL, "libiconv_close");
iconvctl = (void *)GetProcAddress(hIconvDLL, "libiconvctl");
iconv_errno = get_iconv_import_func(hIconvDLL, "_errno");
if (iconv_errno == NULL)
iconv_errno = (void *)GetProcAddress(hMsvcrtDLL, "_errno");
if (iconv == NULL || iconv_open == NULL || iconv_close == NULL
|| iconvctl == NULL || iconv_errno == NULL) {
iconv_end();
if (verbose && p_verbose > 0) {
verbose_enter();
EMSG2(_(e_loadfunc), "for libiconv");
verbose_leave();
}
return false;
}
return true;
}
void iconv_end(void)
{
if (hIconvDLL != 0) {
// TODO(justinmk): use uv_dlclose instead.
FreeLibrary(hIconvDLL);
}
if (hMsvcrtDLL != 0) {
FreeLibrary(hMsvcrtDLL);
}
hIconvDLL = 0;
hMsvcrtDLL = 0;
}
# endif /* DYNAMIC_ICONV */
# endif /* USE_ICONV */
/*
* Setup "vcp" for conversion from "from" to "to".
* The names must have been made canonical with enc_canonize().
* vcp->vc_type must have been initialized to CONV_NONE.
* Note: cannot be used for conversion from/to ucs-2 and ucs-4 (will use utf-8
* instead).
* Afterwards invoke with "from" and "to" equal to NULL to cleanup.
* Return FAIL when conversion is not supported, OK otherwise.
*/
int convert_setup(vimconv_T *vcp, char_u *from, char_u *to)
{
return convert_setup_ext(vcp, from, true, to, true);
}
/*
* As convert_setup(), but only when from_unicode_is_utf8 is TRUE will all
* "from" unicode charsets be considered utf-8. Same for "to".
*/
int convert_setup_ext(vimconv_T *vcp, char_u *from, bool from_unicode_is_utf8,
char_u *to, bool to_unicode_is_utf8)
{
int from_prop;
int to_prop;
int from_is_utf8;
int to_is_utf8;
/* Reset to no conversion. */
# ifdef USE_ICONV
if (vcp->vc_type == CONV_ICONV && vcp->vc_fd != (iconv_t)-1)
iconv_close(vcp->vc_fd);
# endif
*vcp = (vimconv_T)MBYTE_NONE_CONV;
/* No conversion when one of the names is empty or they are equal. */
if (from == NULL || *from == NUL || to == NULL || *to == NUL
|| STRCMP(from, to) == 0)
return OK;
from_prop = enc_canon_props(from);
to_prop = enc_canon_props(to);
if (from_unicode_is_utf8)
from_is_utf8 = from_prop & ENC_UNICODE;
else
from_is_utf8 = from_prop == ENC_UNICODE;
if (to_unicode_is_utf8)
to_is_utf8 = to_prop & ENC_UNICODE;
else
to_is_utf8 = to_prop == ENC_UNICODE;
if ((from_prop & ENC_LATIN1) && to_is_utf8) {
/* Internal latin1 -> utf-8 conversion. */
vcp->vc_type = CONV_TO_UTF8;
vcp->vc_factor = 2; /* up to twice as long */
} else if ((from_prop & ENC_LATIN9) && to_is_utf8) {
/* Internal latin9 -> utf-8 conversion. */
vcp->vc_type = CONV_9_TO_UTF8;
vcp->vc_factor = 3; /* up to three as long (euro sign) */
} else if (from_is_utf8 && (to_prop & ENC_LATIN1)) {
/* Internal utf-8 -> latin1 conversion. */
vcp->vc_type = CONV_TO_LATIN1;
} else if (from_is_utf8 && (to_prop & ENC_LATIN9)) {
/* Internal utf-8 -> latin9 conversion. */
vcp->vc_type = CONV_TO_LATIN9;
}
# ifdef USE_ICONV
else {
/* Use iconv() for conversion. */
vcp->vc_fd = (iconv_t)my_iconv_open(
to_is_utf8 ? (char_u *)"utf-8" : to,
from_is_utf8 ? (char_u *)"utf-8" : from);
if (vcp->vc_fd != (iconv_t)-1) {
vcp->vc_type = CONV_ICONV;
vcp->vc_factor = 4; /* could be longer too... */
}
}
# endif
if (vcp->vc_type == CONV_NONE)
return FAIL;
return OK;
}
/*
* Convert text "ptr[*lenp]" according to "vcp".
* Returns the result in allocated memory and sets "*lenp".
* When "lenp" is NULL, use NUL terminated strings.
* Illegal chars are often changed to "?", unless vcp->vc_fail is set.
* When something goes wrong, NULL is returned and "*lenp" is unchanged.
*/
char_u *string_convert(const vimconv_T *const vcp, char_u *ptr, size_t *lenp)
{
return string_convert_ext(vcp, ptr, lenp, NULL);
}
/*
* Like string_convert(), but when "unconvlenp" is not NULL and there are is
* an incomplete sequence at the end it is not converted and "*unconvlenp" is
* set to the number of remaining bytes.
*/
char_u * string_convert_ext(const vimconv_T *const vcp, char_u *ptr,
size_t *lenp, size_t *unconvlenp)
{
char_u *retval = NULL;
char_u *d;
int l;
int c;
size_t len;
if (lenp == NULL)
len = STRLEN(ptr);
else
len = *lenp;
if (len == 0)
return vim_strsave((char_u *)"");
switch (vcp->vc_type) {
case CONV_TO_UTF8: /* latin1 to utf-8 conversion */
retval = xmalloc(len * 2 + 1);
d = retval;
for (size_t i = 0; i < len; ++i) {
c = ptr[i];
if (c < 0x80)
*d++ = c;
else {
*d++ = 0xc0 + ((unsigned)c >> 6);
*d++ = 0x80 + (c & 0x3f);
}
}
*d = NUL;
if (lenp != NULL)
*lenp = (size_t)(d - retval);
break;
case CONV_9_TO_UTF8: /* latin9 to utf-8 conversion */
retval = xmalloc(len * 3 + 1);
d = retval;
for (size_t i = 0; i < len; ++i) {
c = ptr[i];
switch (c) {
case 0xa4: c = 0x20ac; break; /* euro */
case 0xa6: c = 0x0160; break; /* S hat */
case 0xa8: c = 0x0161; break; /* S -hat */
case 0xb4: c = 0x017d; break; /* Z hat */
case 0xb8: c = 0x017e; break; /* Z -hat */
case 0xbc: c = 0x0152; break; /* OE */
case 0xbd: c = 0x0153; break; /* oe */
case 0xbe: c = 0x0178; break; /* Y */
}
d += utf_char2bytes(c, d);
}
*d = NUL;
if (lenp != NULL)
*lenp = (size_t)(d - retval);
break;
case CONV_TO_LATIN1: /* utf-8 to latin1 conversion */
case CONV_TO_LATIN9: /* utf-8 to latin9 conversion */
retval = xmalloc(len + 1);
d = retval;
for (size_t i = 0; i < len; ++i) {
l = utf_ptr2len_len(ptr + i, len - i);
if (l == 0)
*d++ = NUL;
else if (l == 1) {
uint8_t l_w = utf8len_tab_zero[ptr[i]];
if (l_w == 0) {
/* Illegal utf-8 byte cannot be converted */
xfree(retval);
return NULL;
}
if (unconvlenp != NULL && l_w > len - i) {
/* Incomplete sequence at the end. */
*unconvlenp = len - i;
break;
}
*d++ = ptr[i];
} else {
c = utf_ptr2char(ptr + i);
if (vcp->vc_type == CONV_TO_LATIN9)
switch (c) {
case 0x20ac: c = 0xa4; break; /* euro */
case 0x0160: c = 0xa6; break; /* S hat */
case 0x0161: c = 0xa8; break; /* S -hat */
case 0x017d: c = 0xb4; break; /* Z hat */
case 0x017e: c = 0xb8; break; /* Z -hat */
case 0x0152: c = 0xbc; break; /* OE */
case 0x0153: c = 0xbd; break; /* oe */
case 0x0178: c = 0xbe; break; /* Y */
case 0xa4:
case 0xa6:
case 0xa8:
case 0xb4:
case 0xb8:
case 0xbc:
case 0xbd:
case 0xbe: c = 0x100; break; /* not in latin9 */
}
if (!utf_iscomposing(c)) { /* skip composing chars */
if (c < 0x100)
*d++ = c;
else if (vcp->vc_fail) {
xfree(retval);
return NULL;
} else {
*d++ = 0xbf;
if (utf_char2cells(c) > 1)
*d++ = '?';
}
}
i += l - 1;
}
}
*d = NUL;
if (lenp != NULL)
*lenp = (size_t)(d - retval);
break;
# ifdef USE_ICONV
case CONV_ICONV: /* conversion with vcp->vc_fd */
retval = iconv_string(vcp, ptr, len, unconvlenp, lenp);
break;
# endif
}
return retval;
}
// Check bounds for column number
static int check_col(int col)
{
if (col < 0)
return 0;
if (col >= screen_Columns)
return screen_Columns - 1;
return col;
}
// Check bounds for row number
static int check_row(int row)
{
if (row < 0)
return 0;
if (row >= screen_Rows)
return screen_Rows - 1;
return row;
}
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