263 lines
7.6 KiB
C
263 lines
7.6 KiB
C
/* $Id$ */
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/*
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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 "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);
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char *strecpy(char *dst, const char *src, const char *last);
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char *stredup(const char *src, const char *last = NULL);
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int CDECL seprintf(char *str, const char *last, const char *format, ...) WARN_FORMAT(3, 4);
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int CDECL vseprintf(char *str, const char *last, const char *format, va_list ap);
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char *CDECL str_fmt(const char *str, ...) WARN_FORMAT(1, 2);
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void str_validate(char *str, const char *last, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
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void ValidateString(const char *str);
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void str_fix_scc_encoded(char *str, const char *last);
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void str_strip_colours(char *str);
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bool strtolower(char *str);
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bool StrValid(const char *str, const char *last);
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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 NULL else return false
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*/
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static inline bool StrEmpty(const char *s)
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{
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return s == NULL || 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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static 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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char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16]);
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bool IsValidChar(WChar key, CharSetFilter afilter);
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size_t Utf8Decode(WChar *c, const char *s);
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size_t Utf8Encode(char *buf, WChar c);
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size_t Utf8TrimString(char *s, size_t maxlen);
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static inline WChar Utf8Consume(const char **s)
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{
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WChar 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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static inline int8 Utf8CharLen(WChar 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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static inline int8 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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static 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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static 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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static 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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/**
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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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static 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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static 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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static inline WChar 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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static inline WChar Utf16DecodeChar(const uint16 *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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static inline bool IsTextDirectionChar(WChar 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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static inline bool IsPrintable(WChar 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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static inline bool IsWhitespace(WChar 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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int strnatcmp(const char *s1, const char *s2, bool ignore_garbage_at_front = false);
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#endif /* STRING_FUNC_H */
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