author | peter1138 |
Sun, 03 Aug 2008 17:35:08 +0000 | |
changeset 9834 | 7474149531c1 |
parent 9111 | 48ce04029fe4 |
child 9997 | d858e88e871a |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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(svn r12971) -Documentation: add @file in files that missed them and add something more than whitespace as description of files that don't have a description.
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/** @file string.cpp Handling of C-type strings (char*). */ |
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#include "stdafx.h" |
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#include "openttd.h" |
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#include "debug.h" |
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#include "core/alloc_func.hpp" |
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#include "string_func.h" |
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(svn r11828) -Codechange: include table/* as the last includes and remove an unneeded include from openttd.h.
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#include "table/control_codes.h" |
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#include <stdarg.h> |
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#include <ctype.h> // required for tolower() |
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void ttd_strlcat(char *dst, const char *src, size_t size) |
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{ |
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assert(size > 0); |
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for (; size > 0 && *dst != '\0'; --size, ++dst) {} |
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assert(size > 0); |
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while (--size > 0 && *src != '\0') *dst++ = *src++; |
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*dst = '\0'; |
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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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assert(size > 0); |
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while (--size > 0 && *src != '\0') *dst++ = *src++; |
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*dst = '\0'; |
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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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assert(dst <= last); |
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for (; *dst != '\0'; ++dst) |
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if (dst == last) return dst; |
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for (; *src != '\0' && dst != last; ++dst, ++src) *dst = *src; |
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*dst = '\0'; |
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return strecpy(dst, src, last); |
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} |
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char* strecpy(char* dst, const char* src, const char* last) |
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{ |
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assert(dst <= last); |
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for (; *src != '\0' && dst != last; ++dst, ++src) *dst = *src; |
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*dst = '\0'; |
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if (dst == last && *src != '\0') { |
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#ifdef STRGEN |
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error("String too long for destination buffer"); |
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#else /* STRGEN */ |
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DEBUG(misc, 0, "String too long for destination buffer"); |
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*dst = '\0'; |
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(svn r10566) -Fix [FS#1025]: a NewGRF could have a information message that is too long for the internal buffers to handle. We should not crash on such a case even though the message is too big for the window anyway.
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#endif /* STRGEN */ |
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} |
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return dst; |
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} |
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char* CDECL str_fmt(const char* str, ...) |
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{ |
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char buf[4096]; |
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va_list va; |
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int len; |
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va_start(va, str); |
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len = vsnprintf(buf, lengthof(buf), str, va); |
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va_end(va); |
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char* p = MallocT<char>(len + 1); |
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if (p != NULL) memcpy(p, buf, len + 1); |
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return p; |
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} |
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void str_validate(char *str) |
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{ |
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char *dst = str; |
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WChar c; |
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size_t len; |
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for (len = Utf8Decode(&c, str); c != '\0'; len = Utf8Decode(&c, str)) { |
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if (IsPrintable(c) && (c < SCC_SPRITE_START || c > SCC_SPRITE_END || |
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IsValidChar(c - SCC_SPRITE_START, CS_ALPHANUMERAL))) { |
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/* Copy the character back. Even if dst is current the same as str |
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* (i.e. no characters have been changed) this is quicker than |
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* moving the pointers ahead by len */ |
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do { |
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*dst++ = *str++; |
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} while (--len != 0); |
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} else { |
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/* Replace the undesirable character with a question mark */ |
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str += len; |
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*dst++ = '?'; |
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} |
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} |
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*dst = '\0'; |
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} |
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void str_strip_colours(char *str) |
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{ |
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char *dst = str; |
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WChar c; |
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size_t len; |
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for (len = Utf8Decode(&c, str); c != '\0'; len = Utf8Decode(&c, str)) { |
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if (c < SCC_BLUE || c > SCC_BLACK) { |
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/* Copy the character back. Even if dst is current the same as str |
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112 |
* (i.e. no characters have been changed) this is quicker than |
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* moving the pointers ahead by len */ |
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114 |
do { |
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115 |
*dst++ = *str++; |
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} while (--len != 0); |
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117 |
} else { |
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118 |
/* Just skip (strip) the colour codes */ |
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str += len; |
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120 |
} |
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121 |
} |
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122 |
*dst = '\0'; |
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123 |
} |
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124 |
|
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125 |
/** Convert a given ASCII string to lowercase. |
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* NOTE: only support ASCII characters, no UTF8 fancy. As currently |
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* the function is only used to lowercase data-filenames if they are |
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128 |
* not found, this is sufficient. If more, or general functionality is |
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* needed, look to r7271 where it was removed because it was broken when |
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* using certain locales: eg in Turkish the uppercase 'I' was converted to |
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* '?', so just revert to the old functionality |
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* @param str string to convert */ |
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133 |
void strtolower(char *str) |
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134 |
{ |
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135 |
for (; *str != '\0'; str++) *str = tolower(*str); |
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136 |
} |
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137 |
|
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138 |
/** |
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139 |
* Only allow certain keys. You can define the filter to be used. This makes |
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140 |
* sure no invalid keys can get into an editbox, like BELL. |
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141 |
* @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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144 |
*/ |
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145 |
bool IsValidChar(WChar key, CharSetFilter afilter) |
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146 |
{ |
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147 |
switch (afilter) { |
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case CS_ALPHANUMERAL: return IsPrintable(key); |
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149 |
case CS_NUMERAL: return (key >= '0' && key <= '9'); |
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case CS_ALPHA: return IsPrintable(key) && !(key >= '0' && key <= '9'); |
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151 |
} |
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152 |
|
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153 |
return false; |
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154 |
} |
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155 |
|
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156 |
#ifdef WIN32 |
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157 |
/* Since version 3.14, MinGW Runtime has snprintf() and vsnprintf() conform to C99 but it's not the case for older versions */ |
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#if (__MINGW32_MAJOR_VERSION < 3) || ((__MINGW32_MAJOR_VERSION == 3) && (__MINGW32_MINOR_VERSION < 14)) |
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159 |
int CDECL snprintf(char *str, size_t size, const char *format, ...) |
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160 |
{ |
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161 |
va_list ap; |
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162 |
int ret; |
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163 |
|
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164 |
va_start(ap, format); |
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165 |
ret = vsnprintf(str, size, format, ap); |
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166 |
va_end(ap); |
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167 |
return ret; |
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168 |
} |
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169 |
#endif /* MinGW Runtime < 3.14 */ |
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170 |
|
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171 |
#ifdef _MSC_VER |
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172 |
/* *nprintf broken, not POSIX compliant, MSDN description |
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173 |
* - If len < count, then len characters are stored in buffer, a null-terminator is appended, and len is returned. |
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174 |
* - If len = count, then len characters are stored in buffer, no null-terminator is appended, and len is returned. |
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175 |
* - If len > count, then count characters are stored in buffer, no null-terminator is appended, and a negative value is returned |
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176 |
*/ |
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177 |
int CDECL vsnprintf(char *str, size_t size, const char *format, va_list ap) |
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178 |
{ |
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179 |
int ret; |
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180 |
ret = _vsnprintf(str, size, format, ap); |
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181 |
if (ret < 0 || ret == size) str[size - 1] = '\0'; |
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182 |
return ret; |
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183 |
} |
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184 |
#endif /* _MSC_VER */ |
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185 |
|
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186 |
#endif /* WIN32 */ |
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187 |
|
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188 |
|
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189 |
/** Convert the md5sum to a hexadecimal string representation |
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190 |
* @param buf buffer to put the md5sum into |
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191 |
* @param last last character of buffer (usually lastof(buf)) |
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192 |
* @param md5sum the md5sum itself |
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193 |
* @return a pointer to the next character after the md5sum */ |
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194 |
char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16]) |
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195 |
{ |
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196 |
char *p = buf; |
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197 |
|
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198 |
for (uint i = 0; i < 16; i++) { |
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199 |
p += snprintf(p, last + 1 - p, "%02X", md5sum[i]); |
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200 |
if (p >= last) break; |
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201 |
} |
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202 |
|
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203 |
return p; |
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204 |
} |
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205 |
|
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206 |
|
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207 |
/* UTF-8 handling routines */ |
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208 |
|
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209 |
|
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210 |
/* Decode and consume the next UTF-8 encoded character |
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211 |
* @param c Buffer to place decoded character. |
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212 |
* @param s Character stream to retrieve character from. |
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213 |
* @return Number of characters in the sequence. |
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214 |
*/ |
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215 |
size_t Utf8Decode(WChar *c, const char *s) |
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216 |
{ |
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217 |
assert(c != NULL); |
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218 |
|
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219 |
if (!HasBit(s[0], 7)) { |
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220 |
/* Single byte character: 0xxxxxxx */ |
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221 |
*c = s[0]; |
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return 1; |
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} else if (GB(s[0], 5, 3) == 6) { |
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if (IsUtf8Part(s[1])) { |
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/* Double byte character: 110xxxxx 10xxxxxx */ |
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*c = GB(s[0], 0, 5) << 6 | GB(s[1], 0, 6); |
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if (*c >= 0x80) return 2; |
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} |
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} else if (GB(s[0], 4, 4) == 14) { |
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if (IsUtf8Part(s[1]) && IsUtf8Part(s[2])) { |
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/* Triple byte character: 1110xxxx 10xxxxxx 10xxxxxx */ |
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*c = GB(s[0], 0, 4) << 12 | GB(s[1], 0, 6) << 6 | GB(s[2], 0, 6); |
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if (*c >= 0x800) return 3; |
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} |
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} else if (GB(s[0], 3, 5) == 30) { |
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if (IsUtf8Part(s[1]) && IsUtf8Part(s[2]) && IsUtf8Part(s[3])) { |
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/* 4 byte character: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ |
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*c = GB(s[0], 0, 3) << 18 | GB(s[1], 0, 6) << 12 | GB(s[2], 0, 6) << 6 | GB(s[3], 0, 6); |
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if (*c >= 0x10000 && *c <= 0x10FFFF) return 4; |
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} |
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} |
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|
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//DEBUG(misc, 1, "[utf8] invalid UTF-8 sequence"); |
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*c = '?'; |
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return 1; |
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} |
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247 |
|
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248 |
|
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/* Encode a unicode character and place it in the buffer |
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* @param buf Buffer to place character. |
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* @param c Unicode character to encode. |
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* @return Number of characters in the encoded sequence. |
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*/ |
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size_t Utf8Encode(char *buf, WChar c) |
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{ |
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if (c < 0x80) { |
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*buf = c; |
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return 1; |
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} else if (c < 0x800) { |
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*buf++ = 0xC0 + GB(c, 6, 5); |
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*buf = 0x80 + GB(c, 0, 6); |
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return 2; |
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} else if (c < 0x10000) { |
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*buf++ = 0xE0 + GB(c, 12, 4); |
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*buf++ = 0x80 + GB(c, 6, 6); |
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*buf = 0x80 + GB(c, 0, 6); |
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return 3; |
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268 |
} else if (c < 0x110000) { |
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*buf++ = 0xF0 + GB(c, 18, 3); |
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*buf++ = 0x80 + GB(c, 12, 6); |
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*buf++ = 0x80 + GB(c, 6, 6); |
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*buf = 0x80 + GB(c, 0, 6); |
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return 4; |
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274 |
} |
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275 |
|
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//DEBUG(misc, 1, "[utf8] can't UTF-8 encode value 0x%X", c); |
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*buf = '?'; |
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278 |
return 1; |
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279 |
} |
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(svn r9012) -Fix/Feature (UTF8): When cutting strings into multiple lines also take into consideration whitespace characters of more than 1 byte length (eg IDEOGRAPHIC SPACE, IsWhitespace() function). When trimming such strings, account for multiple-byte long sequences so use *Utf8PrevChar(v) = '\0'.
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280 |
|
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/** |
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282 |
* Properly terminate an UTF8 string to some maximum length |
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* @param s string to check if it needs additional trimming |
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* @param maxlen the maximum length the buffer can have. |
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285 |
* @return the new length in bytes of the string (eg. strlen(new_string)) |
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* @NOTE maxlen is the string length _INCLUDING_ the terminating '\0' |
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287 |
*/ |
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288 |
size_t Utf8TrimString(char *s, size_t maxlen) |
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289 |
{ |
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(svn r9012) -Fix/Feature (UTF8): When cutting strings into multiple lines also take into consideration whitespace characters of more than 1 byte length (eg IDEOGRAPHIC SPACE, IsWhitespace() function). When trimming such strings, account for multiple-byte long sequences so use *Utf8PrevChar(v) = '\0'.
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size_t length = 0; |
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(svn r9012) -Fix/Feature (UTF8): When cutting strings into multiple lines also take into consideration whitespace characters of more than 1 byte length (eg IDEOGRAPHIC SPACE, IsWhitespace() function). When trimming such strings, account for multiple-byte long sequences so use *Utf8PrevChar(v) = '\0'.
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291 |
|
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for (const char *ptr = strchr(s, '\0'); *s != '\0';) { |
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293 |
size_t len = Utf8EncodedCharLen(*s); |
6274
40d2a82c6bd6
(svn r9083) -Codechange: Be more lenient when trimming UTF-8 strings and don't terminate the string when an invalid encoding is encountered, but only focus on maximum length.
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294 |
/* Silently ignore invalid UTF8 sequences, our only concern trimming */ |
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(svn r9083) -Codechange: Be more lenient when trimming UTF-8 strings and don't terminate the string when an invalid encoding is encountered, but only focus on maximum length.
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295 |
if (len == 0) len = 1; |
6215
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296 |
|
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297 |
/* Take care when a hard cutoff was made for the string and |
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* the last UTF8 sequence is invalid */ |
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if (length + len >= maxlen || (s + len > ptr)) break; |
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300 |
s += len; |
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length += len; |
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302 |
} |
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303 |
|
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*s = '\0'; |
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305 |
return length; |
6218 | 306 |
} |