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310 lines
9.9 KiB
C++
310 lines
9.9 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file string_func.h Functions related to low-level strings.
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*
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* @note Be aware of "dangerous" string functions; string functions that
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* have behaviour that could easily cause buffer overruns and such:
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* - strncpy: does not '\0' terminate when input string is longer than
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* the size of the output string. Use strecpy instead.
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* - [v]snprintf: returns the length of the string as it would be written
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* when the output is large enough, so it can be more than the size of
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* the buffer and than can underflow size_t (uint-ish) which makes all
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* subsequent snprintf alikes write outside of the buffer. Use
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* [v]seprintf instead; it will return the number of bytes actually
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* added so no [v]seprintf will cause outside of bounds writes.
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* - [v]sprintf: does not bounds checking: use [v]seprintf instead.
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*/
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#ifndef STRING_FUNC_H
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#define STRING_FUNC_H
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#include <stdarg.h>
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#include <iosfwd>
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#include <iterator>
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#include "core/bitmath_func.hpp"
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#include "string_type.h"
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char *strecat(char *dst, const char *src, const char *last) NOACCESS(3);
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char *strecpy(char *dst, const char *src, const char *last, bool quiet_mode = false) NOACCESS(3);
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char *stredup(const char *src, const char *last = nullptr) NOACCESS(2);
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int CDECL seprintf(char *str, const char *last, const char *format, ...) WARN_FORMAT(3, 4) NOACCESS(2);
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int CDECL vseprintf(char *str, const char *last, const char *format, va_list ap) WARN_FORMAT(3, 0) NOACCESS(2);
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std::string CDECL stdstr_fmt(const char *str, ...) WARN_FORMAT(1, 2);
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std::string stdstr_vfmt(const char *str, va_list va) WARN_FORMAT(1, 0);
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std::string FormatArrayAsHex(std::span<const byte> data, bool upper_case = false);
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char *StrMakeValidInPlace(char *str, const char *last, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK) NOACCESS(2);
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[[nodiscard]] std::string StrMakeValid(std::string_view str, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
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void StrMakeValidInPlace(char *str, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
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const char *str_fix_scc_encoded(char *str, const char *last) NOACCESS(2);
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void str_strip_colours(char *str);
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const char *strip_leading_colours(const char *str);
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inline const char *strip_leading_colours(const std::string &str)
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{
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return strip_leading_colours(str.c_str());
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}
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std::string str_strip_all_scc(const char *str);
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char *str_replace_wchar(char *str, const char *last, char32_t find, char32_t replace);
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bool strtolower(char *str);
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bool strtolower(std::string &str, std::string::size_type offs = 0);
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[[nodiscard]] bool StrValid(const char *str, const char *last) NOACCESS(2);
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void StrTrimInPlace(std::string &str);
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std::string_view StrTrimView(std::string_view str);
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const char *StrLastPathSegment(const char *path);
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inline const char *StrLastPathSegment(const std::string &path)
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{
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return StrLastPathSegment(path.c_str());
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}
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[[nodiscard]] bool StrStartsWithIgnoreCase(std::string_view str, const std::string_view prefix);
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[[nodiscard]] bool StrEndsWithIgnoreCase(std::string_view str, const std::string_view suffix);
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[[nodiscard]] int StrCompareIgnoreCase(const std::string_view str1, const std::string_view str2);
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[[nodiscard]] bool StrEqualsIgnoreCase(const std::string_view str1, const std::string_view str2);
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[[nodiscard]] int StrNaturalCompare(std::string_view s1, std::string_view s2, bool ignore_garbage_at_front = false);
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[[nodiscard]] bool StrNaturalContains(const std::string_view str, const std::string_view value);
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[[nodiscard]] bool StrNaturalContainsIgnoreCase(const std::string_view str, const std::string_view value);
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bool ConvertHexToBytes(std::string_view hex, std::span<uint8_t> bytes);
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/** Case insensitive comparator for strings, for example for use in std::map. */
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struct CaseInsensitiveComparator {
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bool operator()(const std::string_view s1, const std::string_view s2) const { return StrCompareIgnoreCase(s1, s2) < 0; }
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};
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/**
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* Check if a string buffer is empty.
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*
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* @param s The pointer to the first element of the buffer
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* @return true if the buffer starts with the terminating null-character or
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* if the given pointer points to nullptr else return false
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*/
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inline bool StrEmpty(const char *s)
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{
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return s == nullptr || s[0] == '\0';
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}
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/**
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* Get the length of a string, within a limited buffer.
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*
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* @param str The pointer to the first element of the buffer
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* @param maxlen The maximum size of the buffer
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* @return The length of the string
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*/
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inline size_t ttd_strnlen(const char *str, size_t maxlen)
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{
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const char *t;
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for (t = str; (size_t)(t - str) < maxlen && *t != '\0'; t++) {}
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return t - str;
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}
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bool IsValidChar(char32_t key, CharSetFilter afilter);
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size_t Utf8Decode(char32_t *c, const char *s);
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size_t Utf8Encode(char *buf, char32_t c);
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size_t Utf8Encode(std::ostreambuf_iterator<char> &buf, char32_t c);
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size_t Utf8Encode(std::back_insert_iterator<std::string> &buf, char32_t c);
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size_t Utf8TrimString(char *s, size_t maxlen);
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inline char32_t Utf8Consume(const char **s)
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{
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char32_t c;
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*s += Utf8Decode(&c, *s);
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return c;
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}
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template <class Titr>
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inline char32_t Utf8Consume(Titr &s)
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{
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char32_t c;
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s += Utf8Decode(&c, &*s);
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return c;
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}
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/**
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* Return the length of a UTF-8 encoded character.
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* @param c Unicode character.
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* @return Length of UTF-8 encoding for character.
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*/
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inline int8_t Utf8CharLen(char32_t c)
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{
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if (c < 0x80) return 1;
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if (c < 0x800) return 2;
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if (c < 0x10000) return 3;
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if (c < 0x110000) return 4;
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/* Invalid valid, we encode as a '?' */
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return 1;
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}
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/**
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* Return the length of an UTF-8 encoded value based on a single char. This
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* char should be the first byte of the UTF-8 encoding. If not, or encoding
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* is invalid, return value is 0
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* @param c char to query length of
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* @return requested size
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*/
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inline int8_t Utf8EncodedCharLen(char c)
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{
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if (GB(c, 3, 5) == 0x1E) return 4;
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if (GB(c, 4, 4) == 0x0E) return 3;
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if (GB(c, 5, 3) == 0x06) return 2;
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if (GB(c, 7, 1) == 0x00) return 1;
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/* Invalid UTF8 start encoding */
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return 0;
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}
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/* Check if the given character is part of a UTF8 sequence */
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inline bool IsUtf8Part(char c)
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{
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return GB(c, 6, 2) == 2;
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}
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/**
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* Retrieve the previous UNICODE character in an UTF-8 encoded string.
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* @param s char pointer pointing to (the first char of) the next character
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* @return a pointer in 's' to the previous UNICODE character's first byte
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* @note The function should not be used to determine the length of the previous
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* encoded char because it might be an invalid/corrupt start-sequence
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*/
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inline char *Utf8PrevChar(char *s)
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{
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char *ret = s;
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while (IsUtf8Part(*--ret)) {}
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return ret;
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}
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inline const char *Utf8PrevChar(const char *s)
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{
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const char *ret = s;
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while (IsUtf8Part(*--ret)) {}
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return ret;
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}
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size_t Utf8StringLength(const char *s);
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size_t Utf8StringLength(const std::string &str);
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/**
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* Is the given character a lead surrogate code point?
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* @param c The character to test.
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* @return True if the character is a lead surrogate code point.
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*/
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inline bool Utf16IsLeadSurrogate(uint c)
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{
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return c >= 0xD800 && c <= 0xDBFF;
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}
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/**
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* Is the given character a lead surrogate code point?
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* @param c The character to test.
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* @return True if the character is a lead surrogate code point.
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*/
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inline bool Utf16IsTrailSurrogate(uint c)
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{
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return c >= 0xDC00 && c <= 0xDFFF;
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}
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/**
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* Convert an UTF-16 surrogate pair to the corresponding Unicode character.
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* @param lead Lead surrogate code point.
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* @param trail Trail surrogate code point.
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* @return Decoded Unicode character.
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*/
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inline char32_t Utf16DecodeSurrogate(uint lead, uint trail)
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{
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return 0x10000 + (((lead - 0xD800) << 10) | (trail - 0xDC00));
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}
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/**
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* Decode an UTF-16 character.
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* @param c Pointer to one or two UTF-16 code points.
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* @return Decoded Unicode character.
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*/
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inline char32_t Utf16DecodeChar(const uint16_t *c)
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{
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if (Utf16IsLeadSurrogate(c[0])) {
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return Utf16DecodeSurrogate(c[0], c[1]);
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} else {
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return *c;
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}
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}
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/**
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* Is the given character a text direction character.
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* @param c The character to test.
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* @return true iff the character is used to influence
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* the text direction.
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*/
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inline bool IsTextDirectionChar(char32_t c)
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{
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switch (c) {
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case CHAR_TD_LRM:
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case CHAR_TD_RLM:
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case CHAR_TD_LRE:
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case CHAR_TD_RLE:
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case CHAR_TD_LRO:
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case CHAR_TD_RLO:
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case CHAR_TD_PDF:
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return true;
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default:
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return false;
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}
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}
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inline bool IsPrintable(char32_t c)
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{
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if (c < 0x20) return false;
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if (c < 0xE000) return true;
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if (c < 0xE200) return false;
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return true;
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}
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/**
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* Check whether UNICODE character is whitespace or not, i.e. whether
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* this is a potential line-break character.
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* @param c UNICODE character to check
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* @return a boolean value whether 'c' is a whitespace character or not
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* @see http://www.fileformat.info/info/unicode/category/Zs/list.htm
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*/
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inline bool IsWhitespace(char32_t c)
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{
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return c == 0x0020 /* SPACE */ || c == 0x3000; /* IDEOGRAPHIC SPACE */
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}
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/* Needed for NetBSD version (so feature) testing */
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#if defined(__NetBSD__) || defined(__FreeBSD__)
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#include <sys/param.h>
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#endif
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/* strcasestr is available for _GNU_SOURCE, BSD and some Apple */
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#if defined(_GNU_SOURCE) || (defined(__BSD_VISIBLE) && __BSD_VISIBLE) || (defined(__APPLE__) && (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))) || defined(_NETBSD_SOURCE)
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# undef DEFINE_STRCASESTR
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#else
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# define DEFINE_STRCASESTR
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char *strcasestr(const char *haystack, const char *needle);
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#endif /* strcasestr is available */
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#endif /* STRING_FUNC_H */
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