src/TortoiseMerge/svninclude/svn_iter.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_iter.h
  24  * @brief The Subversion Iteration drivers helper routines
  25  *
  26  */
  27
  28 #ifndef SVN_ITER_H
  29 #define SVN_ITER_H
  30
  31 #include <apr.h>         /* for apr_ssize_t */
  32 #include <apr_pools.h>   /* for apr_pool_t */
  33 #include <apr_hash.h>    /* for apr_hash_t */
  34 #include <apr_tables.h>  /* for apr_array_header_t */
  35
  36 #include "svn_types.h"
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif /* __cplusplus */
  41
  42
  43 /** Callback function for use with svn_iter_apr_hash().
  44  * Use @a pool for temporary allocation, it's cleared between invocations.
  45  *
  46  * @a key, @a klen and @a val are the values normally retrieved with
  47  * apr_hash_this().
  48  *
  49  * @a baton is the baton passed into svn_iter_apr_hash().
  50  *
  51  * @since New in 1.5.
  52  */
  53 typedef svn_error_t *(*svn_iter_apr_hash_cb_t)(void *baton,
  54                                                const void *key,
  55                                                apr_ssize_t klen,
  56                                                void *val, apr_pool_t *pool);
  57
  58 /** Iterate over the elements in @a hash, calling @a func for each one until
  59  * there are no more elements or @a func returns an error.
  60  *
  61  * Uses @a pool for temporary allocations.
  62  *
  63  * If @a completed is not NULL, then on return - if @a func returns no
  64  * errors - @a *completed will be set to @c TRUE.
  65  *
  66  * If @a func returns an error other than @c SVN_ERR_ITER_BREAK, that
  67  * error is returned.  When @a func returns @c SVN_ERR_ITER_BREAK,
  68  * iteration is interrupted, but no error is returned and @a *completed is
  69  * set to @c FALSE (even if this iteration was the last one).
  70  *
  71  * @since New in 1.5.
  72  */
  73 svn_error_t *
  74 svn_iter_apr_hash(svn_boolean_t *completed,
  75                   apr_hash_t *hash,
  76                   svn_iter_apr_hash_cb_t func,
  77                   void *baton,
  78                   apr_pool_t *pool);
  79
  80 /** Iteration callback used in conjuction with svn_iter_apr_array().
  81  *
  82  * Use @a pool for temporary allocation, it's cleared between invocations.
  83  *
  84  * @a baton is the baton passed to svn_iter_apr_array().  @a item
  85  * is a pointer to the item written to the array with the APR_ARRAY_PUSH()
  86  * macro.
  87  *
  88  * @since New in 1.5.
  89  */
  90 typedef svn_error_t *(*svn_iter_apr_array_cb_t)(void *baton,
  91                                                 void *item,
  92                                                 apr_pool_t *pool);
  93
  94 /** Iterate over the elements in @a array calling @a func for each one until
  95  * there are no more elements or @a func returns an error.
  96  *
  97  * Uses @a pool for temporary allocations.
  98  *
  99  * If @a completed is not NULL, then on return - if @a func returns no
 100  * errors - @a *completed will be set to @c TRUE.
 101  *
 102  * If @a func returns an error other than @c SVN_ERR_ITER_BREAK, that
 103  * error is returned.  When @a func returns @c SVN_ERR_ITER_BREAK,
 104  * iteration is interrupted, but no error is returned and @a *completed is
 105  * set to @c FALSE (even if this iteration was the last one).
 106  *
 107  * @since New in 1.5.
 108  */
 109 svn_error_t *
 110 svn_iter_apr_array(svn_boolean_t *completed,
 111                    const apr_array_header_t *array,
 112                    svn_iter_apr_array_cb_t func,
 113                    void *baton,
 114                    apr_pool_t *pool);
 115
 116
 117 /** Internal routine used by svn_iter_break() macro.
 118  */
 119 svn_error_t *
 120 svn_iter__break(void);
 121
 122
 123 /** Helper macro to break looping in svn_iter_apr_array() and
 124  * svn_iter_apr_hash() driven loops.
 125  *
 126  * @note The error is just a means of communicating between
 127  *       driver and callback.  There is no need for it to exist
 128  *       past the lifetime of the iterpool.
 129  *
 130  * @since New in 1.5.
 131  */
 132 #define svn_iter_break(pool) return svn_iter__break()
 133
 134
 135 #ifdef __cplusplus
 136 }
 137 #endif /* __cplusplus */
 138
 139 #endif /* SVN_ITER_H */