1

/* $Id$ */

     2

     3

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

     4

     5

#ifndef STRING_FUNC_H

     6

#define STRING_FUNC_H

     7

     8

#include "core/bitmath_func.hpp"

     9

#include "string_type.h"

    10

    11

/**

    12

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

    13

 * @param dst destination buffer

    14

 * @param src string to copy/concatenate

    15

 * @param size size of the destination buffer

    16

 */

    17

void ttd_strlcat(char *dst, const char *src, size_t size);

    18

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

    19

    20

/**

    21

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

    22

 * @param dst destination buffer

    23

 * @param src string to copy

    24

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

    25

 *             if NULL no boundary check is performed

    26

 * @return a pointer to the terminating \0 in the destination buffer

    27

 */

    28

char *strecat(char *dst, const char *src, const char *last);

    29

char *strecpy(char *dst, const char *src, const char *last);

    30

    31

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

    32

    33

/** Scans the string for valid characters and if it finds invalid ones,

    34

 * replaces them with a question mark '?' */

    35

void str_validate(char *str);

    36

    37

/** Scans the string for colour codes and strips them */

    38

void str_strip_colours(char *str);

    39

    40

/** Convert the given string to lowercase, only works with ASCII! */

    41

void strtolower(char *str);

    42

    43

    44

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

    45

    46

    47

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

    48

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

    49

{

    50

	const char *t;

    51

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

    52

	return t - str;

    53

}

    54

    55

/** Convert the md5sum number to a 'hexadecimal' string, return next pos in buffer */

    56

char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16]);

    59

    60

/**

    61

 * Only allow certain keys. You can define the filter to be used. This makes

    62

 *  sure no invalid keys can get into an editbox, like BELL.

    63

 * @param key character to be checked

    64

 * @param afilter the filter to use

    65

 * @return true or false depending if the character is printable/valid or not

    66

 */

    67

bool IsValidChar(WChar key, CharSetFilter afilter);

    68

    69

size_t Utf8Decode(WChar *c, const char *s);

    70

size_t Utf8Encode(char *buf, WChar c);

    71

size_t Utf8TrimString(char *s, size_t maxlen);

    72

    73

    74

static inline WChar Utf8Consume(const char **s)

    75

{

    76

	WChar c;

    77

	*s += Utf8Decode(&c, *s);

    78

	return c;

    79

}

    80

    81

    82

/** Return the length of a UTF-8 encoded character.

    83

 * @param c Unicode character.

    84

 * @return Length of UTF-8 encoding for character.

    85

 */

    86

static inline int8 Utf8CharLen(WChar c)

    87

{

    88

	if (c < 0x80)       return 1;

    89

	if (c < 0x800)      return 2;

    90

	if (c < 0x10000)    return 3;

    91

	if (c < 0x110000)   return 4;

    92

    93

	/* Invalid valid, we encode as a '?' */

    94

	return 1;

    95

}

    96

    97

    98

/**

    99

 * Return the length of an UTF-8 encoded value based on a single char. This

   100

 * char should be the first byte of the UTF-8 encoding. If not, or encoding

   101

 * is invalid, return value is 0

   102

 * @param c char to query length of

   103

 * @return requested size

   104

 */

   105

static inline int8 Utf8EncodedCharLen(char c)

   106

{

   107

	if (GB(c, 3, 5) == 0x1E) return 4;

   108

	if (GB(c, 4, 4) == 0x0E) return 3;

   109

	if (GB(c, 5, 3) == 0x06) return 2;

   110

	if (GB(c, 7, 1) == 0x00) return 1;

   111

   112

	/* Invalid UTF8 start encoding */

   113

	return 0;

   114

}

   115

   116

   117

/* Check if the given character is part of a UTF8 sequence */

   118

static inline bool IsUtf8Part(char c)

   119

{

   120

	return GB(c, 6, 2) == 2;

   121

}

   122

   123

/**

   124

 * Retrieve the previous UNICODE character in an UTF-8 encoded string.

   125

 * @param s char pointer pointing to (the first char of) the next character

   126

 * @return a pointer in 's' to the previous UNICODE character's first byte

   127

 * @note The function should not be used to determine the length of the previous

   128

 * encoded char because it might be an invalid/corrupt start-sequence

   129

 */

   130

static inline char *Utf8PrevChar(const char *s)

   131

{

   132

	const char *ret = s;

   133

	while (IsUtf8Part(*--ret)) {}

   134

	return (char*)ret;

   135

}

   136

   137

   138

static inline bool IsPrintable(WChar c)

   139

{

   140

	if (c < 0x20)   return false;

   141

	if (c < 0xE000) return true;

   142

	if (c < 0xE200) return false;

   143

	return true;

   144

}

   145

   146

/**

   147

 * Check whether UNICODE character is whitespace or not, i.e. whether

   148

 * this is a potential line-break character.

   149

 * @param c UNICODE character to check

   150

 * @return a boolean value whether 'c' is a whitespace character or not

   151

 * @see http://www.fileformat.info/info/unicode/category/Zs/list.htm

   152

 */

   153

static inline bool IsWhitespace(WChar c)

   154

{

   155

	return

   156

	  c == 0x0020 /* SPACE */ ||

   157

	  c == 0x3000 /* IDEOGRAPHIC SPACE */

   158

	;

   159

}

   160

   161

#endif /* STRING_FUNC_H */