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/* $Id$ */

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#ifndef STRING_H

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#define STRING_H

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#include "macros.h"

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/*

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 * dst: destination buffer

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 * src: string to copy/concatenate

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 * size: size of the destination buffer

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

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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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 * dst: destination buffer

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 * src: string to copy

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 * 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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 * returns a pointer to the terminating \0 in the destination buffer

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

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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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/**

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 * Valid filter types for IsValidChar.

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 */

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typedef enum CharSetFilter {

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	CS_ALPHANUMERAL,      //! Both numeric and alphabetic and spaces and stuff

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	CS_NUMERAL,           //! Only numeric ones

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	CS_ALPHA,             //! Only alphabetic values

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} CharSetFilter;

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

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static inline int ttd_strnlen(const char *str, int maxlen)

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{

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	const char *t;

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

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	return t - str;

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}

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typedef uint32 WChar;

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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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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 size_t 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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/* 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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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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#endif /* STRING_H */