/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file properties.h
*
* Load / store utilities for properties files.
*
* @author Mike Becker
* @author Olaf Wintermann
*/
#ifndef UCX_PROPERTIES_H
#define UCX_PROPERTIES_H
#include <cx/hash_map.h>
#include <cx/string.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* UcxProperties object for parsing properties data.
* Most of the fields are for internal use only. You may configure the
* properties parser, e.g. by changing the used delimiter or specifying
* up to three different characters that shall introduce comments.
*/
typedef struct {
/**
* Input buffer (don't set manually).
* Automatically set by calls to ucx_properties_fill().
*/
char *buffer;
/**
* Length of the input buffer (don't set manually).
* Automatically set by calls to ucx_properties_fill().
*/
size_t buflen;
/**
* Current buffer position (don't set manually).
* Used by ucx_properties_next().
*/
size_t pos;
/**
* Internal temporary buffer (don't set manually).
* Used by ucx_properties_next().
*/
char *tmp;
/**
* Internal temporary buffer length (don't set manually).
* Used by ucx_properties_next().
*/
size_t tmplen;
/**
* Internal temporary buffer capacity (don't set manually).
* Used by ucx_properties_next().
*/
size_t tmpcap;
/**
* Parser error code.
* This is always 0 on success and a nonzero value on syntax errors.
* The value is set by ucx_properties_next().
*/
int error;
/**
* The delimiter that shall be used.
* This is '=' by default.
*/
char delimiter;
/**
* The first comment character.
* This is '#' by default.
*/
char comment1;
/**
* The second comment character.
* This is not set by default.
*/
char comment2;
/**
* The third comment character.
* This is not set by default.
*/
char comment3;
} UcxProperties;
/**
* Constructs a new UcxProperties object.
* @return a pointer to the new UcxProperties object
*/
UcxProperties *ucx_properties_new();
/**
* Destroys a UcxProperties object.
* @param prop the UcxProperties object to destroy
*/
void ucx_properties_free(UcxProperties *prop);
/**
* Sets the input buffer for the properties parser.
*
* After calling this function, you may parse the data by calling
* ucx_properties_next() until it returns 0. The function ucx_properties2map()
* is a convenience function that reads as much data as possible by using this
* function.
*
*
* @param prop the UcxProperties object
* @param buf a pointer to the new buffer
* @param len the payload length of the buffer
* @see ucx_properties_next()
* @see ucx_properties2map()
*/
void ucx_properties_fill(UcxProperties *prop, char *buf, size_t len);
/**
* Retrieves the next key/value-pair.
*
* This function returns a nonzero value as long as there are key/value-pairs
* found. If no more key/value-pairs are found, you may refill the input buffer
* with ucx_properties_fill().
*
* <b>Attention:</b> the cxstring.ptr pointers of the output parameters point to
* memory within the input buffer of the parser and will get invalid some time.
* If you want long term copies of the key/value-pairs, use sstrdup() after
* calling this function.
*
* @param prop the UcxProperties object
* @param name a pointer to the cxstring that shall contain the property name
* @param value a pointer to the cxstring that shall contain the property value
* @return Nonzero, if a key/value-pair was successfully retrieved
* @see ucx_properties_fill()
*/
int ucx_properties_next(UcxProperties *prop, cxstring *name, cxstring *value);
/**
* Retrieves all available key/value-pairs and puts them into a UcxMap.
*
* This is done by successive calls to ucx_properties_next() until no more
* key/value-pairs can be retrieved.
*
* The memory for the map values is allocated by the map's own allocator.
*
* @param prop the UcxProperties object
* @param map the target map
* @return The UcxProperties.error code (i.e. 0 on success).
* @see ucx_properties_fill()
* @see UcxMap.allocator
*/
int ucx_properties2map(UcxProperties *prop, CxMap *map);
/**
* Loads a properties file to a UcxMap.
*
* This is a convenience function that reads data from an input
* stream until the end of the stream is reached.
*
* @param map the map object to write the key/value-pairs to
* @param file the <code>FILE*</code> stream to read from
* @return 0 on success, or a non-zero value on error
*
* @see ucx_properties_fill()
* @see ucx_properties2map()
*/
int ucx_properties_load(CxMap *map, FILE *file);
/**
* Stores a UcxMap to a file.
*
* The key/value-pairs are written by using the following format:
*
* <code>[key] = [value]\\n</code>
*
* @param map the map to store
* @param file the <code>FILE*</code> stream to write to
* @return 0 on success, or a non-zero value on error
*/
int ucx_properties_store(CxMap *map, FILE *file);
#ifdef __cplusplus
}
#endif
#endif /* UCX_PROPERTIES_H */