mirror of
https://github.com/JGRennison/OpenTTD-patches.git
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256 lines
8.2 KiB
C
256 lines
8.2 KiB
C
/* $Id$ */
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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 "core/bitmath_func.hpp"
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#include "string_type.h"
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/**
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* Appends characters from one string to another.
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*
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* Appends the source string to the destination string with respect of the
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* terminating null-character and the maximum size of the destination
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* buffer.
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*
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* @note usage ttd_strlcat(dst, src, lengthof(dst));
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* @note lengthof() applies only to fixed size arrays
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*
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* @param dst The buffer containing the target string
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* @param src The buffer containing the string to append
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* @param size The maximum size of the destination buffer
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*/
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void ttd_strlcat(char *dst, const char *src, size_t size);
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/**
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* Copies characters from one buffer to another.
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*
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* Copies the source string to the destination buffer with respect of the
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* terminating null-character and the maximum size of the destination
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* buffer.
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*
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* @note usage ttd_strlcpy(dst, src, lengthof(dst));
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* @note lengthof() applies only to fixed size arrays
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*
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* @param dst The destination buffer
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* @param src The buffer containing the string to copy
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* @param size The maximum size of the destination buffer
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*/
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void ttd_strlcpy(char *dst, const char *src, size_t size);
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/**
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* Appends characters from one string to another.
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*
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* Appends the source string to the destination string with respect of the
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* terminating null-character and and the last pointer to the last element
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* in the destination buffer. If the last pointer is set to NULL no
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* boundary check is performed.
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*
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* @note usage: strecat(dst, src, lastof(dst));
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* @note lastof() applies only to fixed size arrays
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*
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* @param dst The buffer containing the target string
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* @param src The buffer containing the string to append
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* @param last The pointer to the last element of the destination buffer
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* @return The pointer to the terminating null-character in the destination buffer
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*/
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char *strecat(char *dst, const char *src, const char *last);
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/**
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* Copies characters from one buffer to another.
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*
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* Copies the source string to the destination buffer with respect of the
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* terminating null-character and the last pointer to the last element in
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* the destination buffer. If the last pointer is set to NULL no boundary
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* check is performed.
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*
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* @note usage: strecpy(dst, src, lastof(dst));
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* @note lastof() applies only to fixed size arrays
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*
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* @param dst The destination buffer
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* @param src The buffer containing the string to copy
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* @param last The pointer to the last element of the destination buffer
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* @return The pointer to the terminating null-character in the destination buffer
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*/
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char *strecpy(char *dst, const char *src, const char *last);
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int CDECL seprintf(char *str, const char *last, const char *format, ...);
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char *CDECL str_fmt(const char *str, ...);
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/**
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* Scans the string for valid characters and if it finds invalid ones,
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* replaces them with a question mark '?' (if not ignored)
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* @param str the string to validate
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* @param last the last valid character of str
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* @param allow_newlines whether newlines should be allowed or ignored
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* @param ignore whether to ignore or replace with a question mark
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*/
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void str_validate(char *str, const char *last, bool allow_newlines = false, bool ignore = false);
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/** Scans the string for colour codes and strips them */
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void str_strip_colours(char *str);
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/** Convert the given string to lowercase, only works with ASCII! */
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void strtolower(char *str);
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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 firste 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 firste 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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/** Convert the md5sum number to a 'hexadecimal' string, return next pos in buffer */
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char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16]);
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/**
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* Only allow certain keys. You can define the filter to be used. This makes
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* sure no invalid keys can get into an editbox, like BELL.
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* @param key character to be checked
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* @param afilter the filter to use
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* @return true or false depending if the character is printable/valid or not
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*/
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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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/** 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(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 (char*)ret;
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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
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c == 0x0020 /* SPACE */ ||
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c == 0x3000 /* IDEOGRAPHIC SPACE */
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;
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}
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#ifndef _GNU_SOURCE
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/* strndup is a GNU extension */
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char *strndup(const char *s, size_t len);
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#endif /* !_GNU_SOURCE */
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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)))
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# undef DEFINE_STRCASESTR
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#else
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# define DEFINE_STRCASESTR
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const 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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