src/TortoiseMerge/svninclude/svn_utf.h

   1 /**
   2  * @copyright
   3  * ====================================================================
   4  *    Licensed to the Apache Software Foundation (ASF) under one
   5  *    or more contributor license agreements.  See the NOTICE file
   6  *    distributed with this work for additional information
   7  *    regarding copyright ownership.  The ASF licenses this file
   8  *    to you under the Apache License, Version 2.0 (the
   9  *    "License"); you may not use this file except in compliance
  10  *    with the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  *    Unless required by applicable law or agreed to in writing,
  15  *    software distributed under the License is distributed on an
  16  *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  17  *    KIND, either express or implied.  See the License for the
  18  *    specific language governing permissions and limitations
  19  *    under the License.
  20  * ====================================================================
  21  * @endcopyright
  22  *
  23  * @file svn_utf.h
  24  * @brief UTF-8 conversion routines
  25  *
  26  * Whenever a conversion routine cannot convert to or from UTF-8, the
  27  * error returned has code @c APR_EINVAL.
  28  */
  29
  30
  31 \f
  32 #ifndef SVN_UTF_H
  33 #define SVN_UTF_H
  34
  35 #include <apr_pools.h>
  36 #include <apr_xlate.h>  /* for APR_*_CHARSET */
  37
  38 #include "svn_types.h"
  39 #include "svn_string.h"
  40
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif /* __cplusplus */
  44
  45 #define SVN_APR_LOCALE_CHARSET APR_LOCALE_CHARSET
  46 #define SVN_APR_DEFAULT_CHARSET APR_DEFAULT_CHARSET
  47
  48 /**
  49  * Initialize the UTF-8 encoding/decoding routines.
  50  * Allocate cached translation handles in a subpool of @a pool.
  51  *
  52  * If @a assume_native_utf8 is TRUE, the native character set is
  53  * assumed to be UTF-8, i.e. conversion is a no-op. This is useful
  54  * in contexts where the native character set is ASCII but UTF-8
  55  * should be used regardless (e.g. for mod_dav_svn which runs within
  56  * httpd and always uses the "C" locale).
  57  *
  58  * @note It is optional to call this function, but if it is used, no other
  59  * svn function may be in use in other threads during the call of this
  60  * function or when @a pool is cleared or destroyed.
  61  * Initializing the UTF-8 routines will improve performance.
  62  *
  63  * @since New in 1.8.
  64  */
  65 void
  66 svn_utf_initialize2(apr_pool_t *pool,
  67                     svn_boolean_t assume_native_utf8);
  68
  69 /**
  70  * Like svn_utf_initialize2() but without the ability to force the
  71  * native encoding to UTF-8.
  72  *
  73  * @deprecated Provided for backward compatibility with the 1.7 API.
  74  */
  75 SVN_DEPRECATED
  76 void
  77 svn_utf_initialize(apr_pool_t *pool);
  78
  79 /** Set @a *dest to a utf8-encoded stringbuf from native stringbuf @a src;
  80  * allocate @a *dest in @a pool.
  81  */
  82 svn_error_t *
  83 svn_utf_stringbuf_to_utf8(svn_stringbuf_t **dest,
  84                           const svn_stringbuf_t *src,
  85                           apr_pool_t *pool);
  86
  87
  88 /** Set @a *dest to a utf8-encoded string from native string @a src; allocate
  89  * @a *dest in @a pool.
  90  */
  91 svn_error_t *
  92 svn_utf_string_to_utf8(const svn_string_t **dest,
  93                        const svn_string_t *src,
  94                        apr_pool_t *pool);
  95
  96
  97 /** Set @a *dest to a utf8-encoded C string from native C string @a src;
  98  * allocate @a *dest in @a pool.
  99  */
 100 svn_error_t *
 101 svn_utf_cstring_to_utf8(const char **dest,
 102                         const char *src,
 103                         apr_pool_t *pool);
 104
 105
 106 /** Set @a *dest to a utf8 encoded C string from @a frompage encoded C
 107  * string @a src; allocate @a *dest in @a pool.
 108  *
 109  * @since New in 1.4.
 110  */
 111 svn_error_t *
 112 svn_utf_cstring_to_utf8_ex2(const char **dest,
 113                             const char *src,
 114                             const char *frompage,
 115                             apr_pool_t *pool);
 116
 117
 118 /** Like svn_utf_cstring_to_utf8_ex2() but with @a convset_key which is
 119  * ignored.
 120  *
 121  * @deprecated Provided for backward compatibility with the 1.3 API.
 122  */
 123 SVN_DEPRECATED
 124 svn_error_t *
 125 svn_utf_cstring_to_utf8_ex(const char **dest,
 126                            const char *src,
 127                            const char *frompage,
 128                            const char *convset_key,
 129                            apr_pool_t *pool);
 130
 131
 132 /** Set @a *dest to a natively-encoded stringbuf from utf8 stringbuf @a src;
 133  * allocate @a *dest in @a pool.
 134  */
 135 svn_error_t *
 136 svn_utf_stringbuf_from_utf8(svn_stringbuf_t **dest,
 137                             const svn_stringbuf_t *src,
 138                             apr_pool_t *pool);
 139
 140
 141 /** Set @a *dest to a natively-encoded string from utf8 string @a src;
 142  * allocate @a *dest in @a pool.
 143  */
 144 svn_error_t *
 145 svn_utf_string_from_utf8(const svn_string_t **dest,
 146                          const svn_string_t *src,
 147                          apr_pool_t *pool);
 148
 149
 150 /** Set @a *dest to a natively-encoded C string from utf8 C string @a src;
 151  * allocate @a *dest in @a pool.
 152  */
 153 svn_error_t *
 154 svn_utf_cstring_from_utf8(const char **dest,
 155                           const char *src,
 156                           apr_pool_t *pool);
 157
 158
 159 /** Set @a *dest to a @a topage encoded C string from utf8 encoded C string
 160  * @a src; allocate @a *dest in @a pool.
 161  *
 162  * @since New in 1.4.
 163  */
 164 svn_error_t *
 165 svn_utf_cstring_from_utf8_ex2(const char **dest,
 166                               const char *src,
 167                               const char *topage,
 168                               apr_pool_t *pool);
 169
 170
 171 /** Like svn_utf_cstring_from_utf8_ex2() but with @a convset_key which is
 172  * ignored.
 173  *
 174  * @deprecated Provided for backward compatibility with the 1.3 API.
 175  */
 176 SVN_DEPRECATED
 177 svn_error_t *
 178 svn_utf_cstring_from_utf8_ex(const char **dest,
 179                              const char *src,
 180                              const char *topage,
 181                              const char *convset_key,
 182                              apr_pool_t *pool);
 183
 184
 185 /** Return a fuzzily native-encoded C string from utf8 C string @a src,
 186  * allocated in @a pool.  A fuzzy recoding leaves all 7-bit ascii
 187  * characters the same, and substitutes "?\\XXX" for others, where XXX
 188  * is the unsigned decimal code for that character.
 189  *
 190  * This function cannot error; it is guaranteed to return something.
 191  * First it will recode as described above and then attempt to convert
 192  * the (new) 7-bit UTF-8 string to native encoding.  If that fails, it
 193  * will return the raw fuzzily recoded string, which may or may not be
 194  * meaningful in the client's locale, but is (presumably) better than
 195  * nothing.
 196  *
 197  * ### Notes:
 198  *
 199  * Improvement is possible, even imminent.  The original problem was
 200  * that if you converted a UTF-8 string (say, a log message) into a
 201  * locale that couldn't represent all the characters, you'd just get a
 202  * static placeholder saying "[unconvertible log message]".  Then
 203  * Justin Erenkrantz pointed out how on platforms that didn't support
 204  * conversion at all, "svn log" would still fail completely when it
 205  * encountered unconvertible data.
 206  *
 207  * Now for both cases, the caller can at least fall back on this
 208  * function, which converts the message as best it can, substituting
 209  * "?\\XXX" escape codes for the non-ascii characters.
 210  *
 211  * Ultimately, some callers may prefer the iconv "//TRANSLIT" option,
 212  * so when we can detect that at configure time, things will change.
 213  * Also, this should (?) be moved to apr/apu eventually.
 214  *
 215  * See http://subversion.tigris.org/issues/show_bug.cgi?id=807 for
 216  * details.
 217  */
 218 const char *
 219 svn_utf_cstring_from_utf8_fuzzy(const char *src,
 220                                 apr_pool_t *pool);
 221
 222
 223 /** Set @a *dest to a natively-encoded C string from utf8 stringbuf @a src;
 224  * allocate @a *dest in @a pool.
 225  */
 226 svn_error_t *
 227 svn_utf_cstring_from_utf8_stringbuf(const char **dest,
 228                                     const svn_stringbuf_t *src,
 229                                     apr_pool_t *pool);
 230
 231
 232 /** Set @a *dest to a natively-encoded C string from utf8 string @a src;
 233  * allocate @a *dest in @a pool.
 234  */
 235 svn_error_t *
 236 svn_utf_cstring_from_utf8_string(const char **dest,
 237                                  const svn_string_t *src,
 238                                  apr_pool_t *pool);
 239
 240 /** Return the display width of UTF-8-encoded C string @a cstr.
 241  * If the string is not printable or invalid UTF-8, return -1.
 242  *
 243  * @since New in 1.8.
 244  */
 245 int
 246 svn_utf_cstring_utf8_width(const char *cstr);
 247
 248 #ifdef __cplusplus
 249 }
 250 #endif /* __cplusplus */
 251
 252 #endif /* SVN_UTF_H */