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/* $Id$ */

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/** @file string_func.h Functions related to low-level strings. */

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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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 * usage ttd_strlcpy(dst, src, lengthof(dst));

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 * @param dst destination buffer

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 * @param src string to copy/concatenate

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 * @param size 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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void ttd_strlcpy(char *dst, const char *src, size_t size);

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/**

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 * usage: strecpy(dst, src, lastof(dst));

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 * @param dst destination buffer

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 * @param src string to copy

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 * @param last pointer to the last element in the dst array

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 *             if NULL no boundary check is performed

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 * @return a pointer to the terminating \0 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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char *strecpy(char *dst, const char *src, const char *last);

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char *CDECL str_fmt(const char *str, ...);

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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 '?' */

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void str_validate(char *str);

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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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static inline bool StrEmpty(const char *s) { return s == NULL || s[0] == '\0'; }

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/** Get the length of a string, within a limited buffer */

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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; *t != '\0' && (size_t)(t - str) < maxlen; 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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