src/TortoiseMerge/libsvn_diff/iter.c

   1 /* iter.c : iteration drivers
   2  *
   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  */
  22
  23
  24 #include "svn_iter.h"
  25 #include "svn_pools.h"
  26 #include "private/svn_dep_compat.h"
  27
  28 #include "svn_error_codes.h"
  29
  30 static svn_error_t internal_break_error =
  31   {
  32     SVN_ERR_ITER_BREAK, /* APR status */
  33     NULL, /* message */
  34     NULL, /* child error */
  35     NULL, /* pool */
  36     __FILE__, /* file name */
  37     __LINE__ /* line number */
  38   };
  39
  40 #if APR_VERSION_AT_LEAST(1, 4, 0)
  41 struct hash_do_baton
  42 {
  43   void *baton;
  44   svn_iter_apr_hash_cb_t func;
  45   svn_error_t *err;
  46   apr_pool_t *iterpool;
  47 };
  48
  49 static
  50 int hash_do_callback(void *baton,
  51                      const void *key,
  52                      apr_ssize_t klen,
  53                      const void *value)
  54 {
  55   struct hash_do_baton *hdb = baton;
  56
  57   svn_pool_clear(hdb->iterpool);
  58   hdb->err = (*hdb->func)(hdb->baton, key, klen, (void *)value, hdb->iterpool);
  59
  60   return hdb->err == SVN_NO_ERROR;
  61 }
  62 #endif
  63
  64 svn_error_t *
  65 svn_iter_apr_hash(svn_boolean_t *completed,
  66                   apr_hash_t *hash,
  67                   svn_iter_apr_hash_cb_t func,
  68                   void *baton,
  69                   apr_pool_t *pool)
  70 {
  71 #if APR_VERSION_AT_LEAST(1, 4, 0)
  72   struct hash_do_baton hdb;
  73   svn_boolean_t error_received;
  74
  75   hdb.func = func;
  76   hdb.baton = baton;
  77   hdb.iterpool = svn_pool_create(pool);
  78
  79   error_received = !apr_hash_do(hash_do_callback, &hdb, hash);
  80
  81   svn_pool_destroy(hdb.iterpool);
  82
  83   if (completed)
  84     *completed = !error_received;
  85
  86   if (!error_received)
  87     return SVN_NO_ERROR;
  88
  89   if (hdb.err->apr_err == SVN_ERR_ITER_BREAK
  90         && hdb.err != &internal_break_error)
  91     {
  92         /* Errors - except those created by svn_iter_break() -
  93            need to be cleared when not further propagated. */
  94         svn_error_clear(hdb.err);
  95
  96         hdb.err = SVN_NO_ERROR;
  97     }
  98
  99   return hdb.err;
 100 #else
 101   svn_error_t *err = SVN_NO_ERROR;
 102   apr_pool_t *iterpool = svn_pool_create(pool);
 103   apr_hash_index_t *hi;
 104
 105   for (hi = apr_hash_first(pool, hash);
 106        ! err && hi; hi = apr_hash_next(hi))
 107     {
 108       const void *key;
 109       void *val;
 110       apr_ssize_t len;
 111
 112       svn_pool_clear(iterpool);
 113
 114       apr_hash_this(hi, &key, &len, &val);
 115       err = (*func)(baton, key, len, val, iterpool);
 116     }
 117
 118   if (completed)
 119     *completed = ! err;
 120
 121   if (err && err->apr_err == SVN_ERR_ITER_BREAK)
 122     {
 123       if (err != &internal_break_error)
 124         /* Errors - except those created by svn_iter_break() -
 125            need to be cleared when not further propagated. */
 126         svn_error_clear(err);
 127
 128       err = SVN_NO_ERROR;
 129     }
 130
 131   /* Clear iterpool, because callers may clear the error but have no way
 132      to clear the iterpool with potentially lots of allocated memory */
 133   svn_pool_destroy(iterpool);
 134
 135   return err;
 136 #endif
 137 }
 138
 139 svn_error_t *
 140 svn_iter_apr_array(svn_boolean_t *completed,
 141                    const apr_array_header_t *array,
 142                    svn_iter_apr_array_cb_t func,
 143                    void *baton,
 144                    apr_pool_t *pool)
 145 {
 146   svn_error_t *err = SVN_NO_ERROR;
 147   apr_pool_t *iterpool = svn_pool_create(pool);
 148   int i;
 149
 150   for (i = 0; (! err) && i < array->nelts; ++i)
 151     {
 152       void *item = array->elts + array->elt_size*i;
 153
 154       svn_pool_clear(iterpool);
 155
 156       err = (*func)(baton, item, iterpool);
 157     }
 158
 159   if (completed)
 160     *completed = ! err;
 161
 162   if (err && err->apr_err == SVN_ERR_ITER_BREAK)
 163     {
 164       if (err != &internal_break_error)
 165         /* Errors - except those created by svn_iter_break() -
 166            need to be cleared when not further propagated. */
 167         svn_error_clear(err);
 168
 169       err = SVN_NO_ERROR;
 170     }
 171
 172   /* Clear iterpool, because callers may clear the error but have no way
 173      to clear the iterpool with potentially lots of allocated memory */
 174   svn_pool_destroy(iterpool);
 175
 176   return err;
 177 }
 178
 179 /* Note: Although this is a "__" function, it is in the public ABI, so
 180  * we can never remove it or change its signature. */
 181 svn_error_t *
 182 svn_iter__break(void)
 183 {
 184   return &internal_break_error;
 185 }
 186
 187 /* Note about the type casts:  apr_hash_this() does not expect a const hash
 188  * index pointer even though it does not modify the hash index.  In
 189  * Subversion we're trying to be const-correct, so these functions all take
 190  * a const hash index and we cast away the const when passing it down to
 191  * APR.  (A compiler may warn about casting away 'const', but at least this
 192  * cast is explicit and gathered in one place.) */
 193
 194 const void *svn__apr_hash_index_key(const apr_hash_index_t *hi)
 195 {
 196   const void *key;
 197
 198   apr_hash_this((apr_hash_index_t *)hi, &key, NULL, NULL);
 199   return key;
 200 }
 201
 202 apr_ssize_t svn__apr_hash_index_klen(const apr_hash_index_t *hi)
 203 {
 204   apr_ssize_t klen;
 205
 206   apr_hash_this((apr_hash_index_t *)hi, NULL, &klen, NULL);
 207   return klen;
 208 }
 209
 210 void *svn__apr_hash_index_val(const apr_hash_index_t *hi)
 211 {
 212   void *val;
 213
 214   apr_hash_this((apr_hash_index_t *)hi, NULL, NULL, &val);
 215   return val;
 216 }