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ad5a155b1f
Problems: - Illegal bytes after valid UTF-8 char cause utf_cp_*_off() to fail. - When stream isn't NUL-terminated, utf_cp_*_off() may go over the end. Solution: Don't go over end of the char of end of the string.
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/types.h> // IWYU pragma: keep
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#include <uv.h> // IWYU pragma: keep
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#include "nvim/cmdexpand_defs.h" // IWYU pragma: keep
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#include "nvim/eval/typval_defs.h" // IWYU pragma: keep
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#include "nvim/func_attr.h"
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#include "nvim/macros_defs.h"
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#include "nvim/mbyte_defs.h" // IWYU pragma: keep
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#include "nvim/types_defs.h" // IWYU pragma: keep
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#ifdef INCLUDE_GENERATED_DECLARATIONS
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# include "mbyte.h.generated.h"
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#endif
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enum {
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kInvalidByteCells = 4,
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};
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// Return byte length of character that starts with byte "b".
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// Returns 1 for a single-byte character.
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// MB_BYTE2LEN_CHECK() can be used to count a special key as one byte.
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// Don't call MB_BYTE2LEN(b) with b < 0 or b > 255!
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#define MB_BYTE2LEN(b) utf8len_tab[b]
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#define MB_BYTE2LEN_CHECK(b) (((b) < 0 || (b) > 255) ? 1 : utf8len_tab[b])
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extern const uint8_t utf8len_tab_zero[256];
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extern const uint8_t utf8len_tab[256];
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// Use our own character-case definitions, because the current locale may
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// differ from what the .spl file uses.
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// These must not be called with negative number!
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// Multi-byte implementation. For Unicode we can call utf_*(), but don't do
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// that for ASCII, because we don't want to use 'casemap' here. Otherwise use
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// the "w" library function for characters above 255.
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#define SPELL_TOFOLD(c) ((c) >= 128 ? utf_fold(c) : (int)spelltab.st_fold[c])
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#define SPELL_TOUPPER(c) ((c) >= 128 ? mb_toupper(c) : (int)spelltab.st_upper[c])
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#define SPELL_ISUPPER(c) ((c) >= 128 ? mb_isupper(c) : spelltab.st_isu[c])
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// MB_PTR_ADV(): advance a pointer to the next character, taking care of
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// multi-byte characters if needed. Skip over composing chars.
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#define MB_PTR_ADV(p) (p += utfc_ptr2len((char *)p))
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// MB_PTR_BACK(): backup a pointer to the previous character, taking care of
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// multi-byte characters if needed. Only use with "p" > "s" !
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#define MB_PTR_BACK(s, p) \
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(p -= utf_head_off((char *)(s), (char *)(p) - 1) + 1)
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/// Check whether a given UTF-8 byte is a trailing byte (10xx.xxxx).
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static inline bool utf_is_trail_byte(uint8_t byte)
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REAL_FATTR_CONST REAL_FATTR_ALWAYS_INLINE;
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static inline bool utf_is_trail_byte(uint8_t const byte)
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{
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// uint8_t is for clang to use smaller cmp
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return (uint8_t)(byte & 0xC0U) == 0x80U;
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}
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static inline CharInfo utf_ptr2CharInfo(char const *p_in)
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REAL_FATTR_NONNULL_ALL REAL_FATTR_PURE REAL_FATTR_WARN_UNUSED_RESULT REAL_FATTR_ALWAYS_INLINE;
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/// Convert a UTF-8 byte sequence to a Unicode code point.
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/// Handles ascii, multibyte sequiences and illegal sequences.
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///
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/// @param[in] p_in String to convert.
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///
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/// @return information abouth the character. When the sequence is illegal,
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/// "value" is negative, "len" is 1.
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static inline CharInfo utf_ptr2CharInfo(char const *const p_in)
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{
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uint8_t const *const p = (uint8_t const *)p_in;
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uint8_t const first = *p;
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if (first < 0x80) {
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return (CharInfo){ .value = first, .len = 1 };
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} else {
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int len = utf8len_tab[first];
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int32_t const code_point = utf_ptr2CharInfo_impl(p, (uintptr_t)len);
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if (code_point < 0) {
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len = 1;
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}
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return (CharInfo){ .value = code_point, .len = len };
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}
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}
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static inline StrCharInfo utfc_next(StrCharInfo cur)
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REAL_FATTR_NONNULL_ALL REAL_FATTR_ALWAYS_INLINE REAL_FATTR_PURE;
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/// Return information about the next character.
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/// Composing and combining characters are considered a part of the current character.
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///
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/// @param[in] cur Information about the current character in the string.
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static inline StrCharInfo utfc_next(StrCharInfo cur)
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{
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int32_t prev_code = cur.chr.value;
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uint8_t *next = (uint8_t *)(cur.ptr + cur.chr.len);
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while (true) {
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if (EXPECT(*next < 0x80U, true)) {
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return (StrCharInfo){
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.ptr = (char *)next,
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.chr = (CharInfo){ .value = *next, .len = 1 },
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};
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}
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uint8_t const next_len = utf8len_tab[*next];
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int32_t const next_code = utf_ptr2CharInfo_impl(next, (uintptr_t)next_len);
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if (!utf_char_composinglike(prev_code, next_code)) {
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return (StrCharInfo){
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.ptr = (char *)next,
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.chr = (CharInfo){ .value = next_code, .len = (next_code < 0 ? 1 : next_len) },
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};
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}
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prev_code = next_code;
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next += next_len;
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}
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}
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static inline StrCharInfo utf_ptr2StrCharInfo(char *ptr)
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REAL_FATTR_NONNULL_ALL REAL_FATTR_ALWAYS_INLINE REAL_FATTR_PURE;
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static inline StrCharInfo utf_ptr2StrCharInfo(char *ptr)
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{
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return (StrCharInfo){ .ptr = ptr, .chr = utf_ptr2CharInfo(ptr) };
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}
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