apr_tables.h

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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_TABLES_H
#define APR_TABLES_H

/**
 * @file apr_tables.h
 * @brief APR Table library
 */

#include "apr.h"
#include "apr_pools.h"

#if APR_HAVE_STDARG_H
#include <stdarg.h>     /* for va_list */
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @defgroup apr_tables Table and Array Functions
 * @ingroup APR 
 * Tables are used to store entirely opaque structures 
 * for applications, while Arrays are usually used to
 * deal with string lists.
 * @{
 */

/** the table abstract data type */
typedef struct apr_table_t apr_table_t;

/** @see apr_array_header_t */
typedef struct apr_array_header_t apr_array_header_t;

/** An opaque array type */
struct apr_array_header_t {
    /** The pool the array is allocated out of */
    apr_pool_t *pool;
    /** The amount of memory allocated for each element of the array */
    int elt_size;
    /** The number of active elements in the array */
    int nelts;
    /** The number of elements allocated in the array */
    int nalloc;
    /** The elements in the array */
    char *elts;
};

/**
 * The (opaque) structure for string-content tables.
 */
typedef struct apr_table_entry_t apr_table_entry_t;

/** The type for each entry in a string-content table */
struct apr_table_entry_t {
    /** The key for the current table entry */
    char *key;          /* maybe NULL in future;
                         * check when iterating thru table_elts
                         */
    /** The value for the current table entry */
    char *val;

    /** A checksum for the key, for use by the apr_table internals */
    apr_uint32_t key_checksum;
};

/**
 * Get the elements from a table
 * @param t The table
 * @return An array containing the contents of the table
 */
APR_DECLARE(const apr_array_header_t *) apr_table_elts(const apr_table_t *t);

/**
 * Determine if the table is empty
 * @param t The table to check
 * @return True if empty, False otherwise
 */
APR_DECLARE(int) apr_is_empty_table(const apr_table_t *t);

/**
 * Determine if the array is empty
 * @param a The array to check
 * @return True if empty, False otherwise
 */
APR_DECLARE(int) apr_is_empty_array(const apr_array_header_t *a);

/**
 * Create an array
 * @param p The pool to allocate the memory out of
 * @param nelts the number of elements in the initial array
 * @param elt_size The size of each element in the array.
 * @return The new array
 */
APR_DECLARE(apr_array_header_t *) apr_array_make(apr_pool_t *p,
                                                 int nelts, int elt_size);

/**
 * Add a new element to an array
 * @param arr The array to add an element to.
 * @return Location for the new element in the array.
 * @remark If there are no free spots in the array, then this function will
 *         allocate new space for the new element.
 */
APR_DECLARE(void *) apr_array_push(apr_array_header_t *arr);

/**
 * Remove an element from an array
 * @param arr The array to remove an element from.
 * @return Location of the element in the array.
 * @remark If there are no elements in the array, NULL is returned.
 */
APR_DECLARE(void *) apr_array_pop(apr_array_header_t *arr);

/**
 * Concatenate two arrays together
 * @param dst The destination array, and the one to go first in the combined 
 *            array
 * @param src The source array to add to the destination array
 */
APR_DECLARE(void) apr_array_cat(apr_array_header_t *dst,
			        const apr_array_header_t *src);

/**
 * Copy the entire array
 * @param p The pool to allocate the copy of the array out of
 * @param arr The array to copy
 * @return An exact copy of the array passed in
 * @remark The alternate apr_array_copy_hdr copies only the header, and arranges 
 *         for the elements to be copied if (and only if) the code subsequently
 *         does a push or arraycat.
 */
APR_DECLARE(apr_array_header_t *) apr_array_copy(apr_pool_t *p,
                                      const apr_array_header_t *arr);
/**
 * Copy the headers of the array, and arrange for the elements to be copied if
 * and only if the code subsequently does a push or arraycat.
 * @param p The pool to allocate the copy of the array out of
 * @param arr The array to copy
 * @return An exact copy of the array passed in
 * @remark The alternate apr_array_copy copies the *entire* array.
 */
APR_DECLARE(apr_array_header_t *) apr_array_copy_hdr(apr_pool_t *p,
                                      const apr_array_header_t *arr);

/**
 * Append one array to the end of another, creating a new array in the process.
 * @param p The pool to allocate the new array out of
 * @param first The array to put first in the new array.
 * @param second The array to put second in the new array.
 * @return A new array containing the data from the two arrays passed in.
*/
APR_DECLARE(apr_array_header_t *) apr_array_append(apr_pool_t *p,
                                      const apr_array_header_t *first,
                                      const apr_array_header_t *second);

/**
 * Generates a new string from the apr_pool_t containing the concatenated 
 * sequence of substrings referenced as elements within the array.  The string 
 * will be empty if all substrings are empty or null, or if there are no 
 * elements in the array.  If sep is non-NUL, it will be inserted between 
 * elements as a separator.
 * @param p The pool to allocate the string out of
 * @param arr The array to generate the string from
 * @param sep The separator to use
 * @return A string containing all of the data in the array.
 */
APR_DECLARE(char *) apr_array_pstrcat(apr_pool_t *p,
				      const apr_array_header_t *arr,
				      const char sep);

/**
 * Make a new table
 * @param p The pool to allocate the pool out of
 * @param nelts The number of elements in the initial table.
 * @return The new table.
 * @warning This table can only store text data
 */
APR_DECLARE(apr_table_t *) apr_table_make(apr_pool_t *p, int nelts);

/**
 * Create a new table and copy another table into it
 * @param p The pool to allocate the new table out of
 * @param t The table to copy
 * @return A copy of the table passed in
 */
APR_DECLARE(apr_table_t *) apr_table_copy(apr_pool_t *p,
                                          const apr_table_t *t);

/**
 * Delete all of the elements from a table
 * @param t The table to clear
 */
APR_DECLARE(void) apr_table_clear(apr_table_t *t);

/**