buildroot中C语言使用libconfig的实例

首先在buildroot中开启libconfig

在config中添加

BR2_PACKAGE_LIBCONFIG=y

下面是官方给出来的3个实例

/* ----------------------------------------------------------------------------libconfig - A library for processing structured configuration filesCopyright (C) 2005-2010  Mark A LindnerThis file is part of libconfig.This library is free software; you can redistribute it and/ormodify it under the terms of the GNU Lesser General Public Licenseas published by the Free Software Foundation; either version 2.1 ofthe License, or (at your option) any later version.This library is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNULesser General Public License for more details.You should have received a copy of the GNU Library General PublicLicense along with this library; if not, see<http://www.gnu.org/licenses/>.----------------------------------------------------------------------------
*/#include <stdio.h>
#include <stdlib.h>
#include <libconfig.h>/* This example reads the configuration file 'example.cfg' and displays* some of its contents.*/int main(int argc, char **argv)
{config_t cfg;config_setting_t *setting;const char *str;config_init(&cfg);/* Read the file. If there is an error, report it and exit. */if(! config_read_file(&cfg, "example.cfg")){fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),config_error_line(&cfg), config_error_text(&cfg));config_destroy(&cfg);return(EXIT_FAILURE);}/* Get the store name. */if(config_lookup_string(&cfg, "name", &str))printf("Store name: %s\n\n", str);elsefprintf(stderr, "No 'name' setting in configuration file.\n");/* Output a list of all books in the inventory. */setting = config_lookup(&cfg, "inventory.books");if(setting != NULL){int count = config_setting_length(setting);int i;printf("%-30s  %-30s   %-6s  %s\n", "TITLE", "AUTHOR", "PRICE", "QTY");for(i = 0; i < count; ++i){config_setting_t *book = config_setting_get_elem(setting, i);/* Only output the record if all of the expected fields are present. */const char *title, *author;double price;int qty;if(!(config_setting_lookup_string(book, "title", &title)&& config_setting_lookup_string(book, "author", &author)&& config_setting_lookup_float(book, "price", &price)&& config_setting_lookup_int(book, "qty", &qty)))continue;printf("%-30s  %-30s  $%6.2f  %3d\n", title, author, price, qty);}putchar('\n');}/* Output a list of all movies in the inventory. */setting = config_lookup(&cfg, "inventory.movies");if(setting != NULL){unsigned int count = config_setting_length(setting);unsigned int i;printf("%-30s  %-10s   %-6s  %s\n", "TITLE", "MEDIA", "PRICE", "QTY");for(i = 0; i < count; ++i){config_setting_t *movie = config_setting_get_elem(setting, i);/* Only output the record if all of the expected fields are present. */const char *title, *media;double price;int qty;if(!(config_setting_lookup_string(movie, "title", &title)&& config_setting_lookup_string(movie, "media", &media)&& config_setting_lookup_float(movie, "price", &price)&& config_setting_lookup_int(movie, "qty", &qty)))continue;printf("%-30s  %-10s  $%6.2f  %3d\n", title, media, price, qty);}putchar('\n');}config_destroy(&cfg);return(EXIT_SUCCESS);
}/* eof */

/* ----------------------------------------------------------------------------libconfig - A library for processing structured configuration filesCopyright (C) 2005-2010  Mark A LindnerThis file is part of libconfig.This library is free software; you can redistribute it and/ormodify it under the terms of the GNU Lesser General Public Licenseas published by the Free Software Foundation; either version 2.1 ofthe License, or (at your option) any later version.This library is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNULesser General Public License for more details.You should have received a copy of the GNU Library General PublicLicense along with this library; if not, see<http://www.gnu.org/licenses/>.----------------------------------------------------------------------------
*/#include <stdio.h>
#include <stdlib.h>
#include <libconfig.h>/* This example reads the configuration file 'example.cfg', adds a new* movie record to the movies list, and writes the updated configuration to* 'updated.cfg'.*/int main(int argc, char **argv)
{static const char *output_file = "updated.cfg";config_t cfg;config_setting_t *root, *setting, *movie;config_init(&cfg);/* Read the file. If there is an error, report it and exit. */if(! config_read_file(&cfg, "example.cfg")){fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),config_error_line(&cfg), config_error_text(&cfg));config_destroy(&cfg);return(EXIT_FAILURE);}/* Find the 'movies' setting. Add intermediate settings if they don't yet* exist.*/root = config_root_setting(&cfg);setting = config_setting_get_member(root, "inventory");if(!setting)setting = config_setting_add(root, "inventory", CONFIG_TYPE_GROUP);setting = config_setting_get_member(setting, "movies");if(!setting)setting = config_setting_add(setting, "movies", CONFIG_TYPE_LIST);/* Create the new movie entry. */movie = config_setting_add(setting, NULL, CONFIG_TYPE_GROUP);setting = config_setting_add(movie, "title", CONFIG_TYPE_STRING);config_setting_set_string(setting, "Buckaroo Banzai");setting = config_setting_add(movie, "media", CONFIG_TYPE_STRING);config_setting_set_string(setting, "DVD");setting = config_setting_add(movie, "price", CONFIG_TYPE_FLOAT);config_setting_set_float(setting, 12.99);setting = config_setting_add(movie, "qty", CONFIG_TYPE_INT);config_setting_set_float(setting, 20);config_set_options(&cfg, 0);/* Write out the updated configuration. */if(! config_write_file(&cfg, output_file)){fprintf(stderr, "Error while writing file.\n");config_destroy(&cfg);return(EXIT_FAILURE);}fprintf(stderr, "Updated configuration successfully written to: %s\n",output_file);config_destroy(&cfg);return(EXIT_SUCCESS);
}/* eof */

/* ----------------------------------------------------------------------------libconfig - A library for processing structured configuration filesCopyright (C) 2005-2010  Mark A LindnerThis file is part of libconfig.This library is free software; you can redistribute it and/ormodify it under the terms of the GNU Lesser General Public Licenseas published by the Free Software Foundation; either version 2.1 ofthe License, or (at your option) any later version.This library is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNULesser General Public License for more details.You should have received a copy of the GNU Library General PublicLicense along with this library; if not, see<http://www.gnu.org/licenses/>.----------------------------------------------------------------------------
*/#include <stdio.h>
#include <stdlib.h>
#include <libconfig.h>/* This example constructs a new configuration in memory and writes it to* 'newconfig.cfg'.*/int main(int argc, char **argv)
{static const char *output_file = "newconfig.cfg";config_t cfg;config_setting_t *root, *setting, *group, *array;int i;config_init(&cfg);root = config_root_setting(&cfg);/* Add some settings to the configuration. */group = config_setting_add(root, "address", CONFIG_TYPE_GROUP);setting = config_setting_add(group, "street", CONFIG_TYPE_STRING);config_setting_set_string(setting, "1 Woz Way");setting = config_setting_add(group, "city", CONFIG_TYPE_STRING);config_setting_set_string(setting, "San Jose");setting = config_setting_add(group, "state", CONFIG_TYPE_STRING);config_setting_set_string(setting, "CA");setting = config_setting_add(group, "zip", CONFIG_TYPE_INT);config_setting_set_int(setting, 95110);array = config_setting_add(root, "numbers", CONFIG_TYPE_ARRAY);for(i = 0; i < 10; ++i){setting = config_setting_add(array, NULL, CONFIG_TYPE_INT);config_setting_set_int(setting, 10 * i);}/* Write out the new configuration. */if(! config_write_file(&cfg, output_file)){fprintf(stderr, "Error while writing file.\n");config_destroy(&cfg);return(EXIT_FAILURE);}fprintf(stderr, "New configuration successfully written to: %s\n",output_file);config_destroy(&cfg);return(EXIT_SUCCESS);
}/* eof */

使用的时候需要链接库Makefile中添加 -lconfig

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