配置文件读取代码,C代码库,德仔网

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【C】配置文件读取
作者:善培 / 发布于2015/6/25/ 657

	/*****************************
	writed by zhangliang
	email: liangzhws@foxmail.com
	date:2016/6/19
	*****************************/
	
	/*************************
	data model
	CFG----------
	 \-----------
	 | cg_count |
	CFGNODE----->| cn_count |
	 | next |---
	 | node_name | \
	 | \0 | \
	 | key | |
	 | \0 | |
	 | value | |
	 | key | |
	 | \0 | |
	 | value | |
	 . /
	 . /
	 . _ /
	CFGNODE----->| cn_count |<
	 | next |----> NULL
	 | node_name |
	 | \0 |
	 .
	 .
	 .
	*************************/
	#ifndef _CFG_H_
	#define _CFG_H_ 1
	
	typedef struct ConfigNode {
	 int cn_count;
	 struct ConfigNode * next;
	 char cn_buf[];
	}ConfigNode_t,* CFGNODE;
	
	typedef struct Config {
	 int cg_count;
	 char cg_buf[];
	}Config_t, * CFG;
	
	/**
	@name: readConfig
	@function: init CFGfrom config file
	@param1: #const char * fileptr# file path
	@return: #CFG# return null is failure ,other is success
	*/
	CFG readConfig(const char * fileptr);
	
	/**
	@name: closeConfig
	@function: destory CFG
	@param1: #CFG cgptr# CFGobject
	@return: #void#
	*/
	void closeConfig(CFG cgptr);
	
	/**
	@name: getConfigNode
	@function: get the node from config_t object
	@param1: #const CFG* cgptr# CFGobject;
	@param2: #char * nameptr# node's name
	@return: #CFGNODE*# return null is the node not exist in config, other return the config_node object
	*/
	CFGNODE getConfigNode(const CFG cgptr, const char * nameptr);
	
	/**
	@name: getConfigField
	@function: get the value of key from config_node object
	@param1: #CFGNODE cnptr# config_node object
	@param2: #const char * keyptr# key's name
	*/
	char * getConfigField(CFGNODE cnptr, const char * keyptr);
	/**
	@name: getConfigNodeField
	@function: get the value of key from config object
	@param1: #CFG cgptr# CFGobject
	@param2: #const char * nodeptr# node's name
	@param3: #const char * keyptr# key's name
	@return: #char * # return NULL is means the node not exist or the value is empty, other is value
	*/
	char * getConfigNodeField(const CFG cgptr, const char * nodeptr, const char * keyptr);
	/**
	
	*/
	#endif /* _CFG_H_ */

	

	

	#include "cfg.h"
	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	
	#define MAXLINE 1024
	
	#define CONFIGNODE 0
	#define CONFIGFIELD 1
	#define CONFIGNONE 2
	
	static char * trim(char * sptr) {
	 char * pend = sptr + strlen(sptr)-1;
	 char * pstart = sptr;
	 int n = 0;
	 for (;pstart <= pend && *pstart == ' '; ++pstart);
	 for (;pend > pstart && *pend == ' '; --pend);
	 *++pend = '\0';
	 n = pend - pstart + 1;
	 memmove(sptr, pstart, n);
	 return sptr;
	}
	
	static int parseConfig(char * lineptr,int * type, char * nodeptr, char * keyptr, char * valueptr) {
	 int n = 0;
	 int flag = 0;
	 char * pnode = nodeptr;
	 char * pkey = keyptr;
	 char * pval = valueptr;
	 char * line = strdup(lineptr);
	 char * p = trim(line);
	 if ('[' == *p) {
	 ++p;
	 while (*p != ']') {
	 if (*p != ' ' && *p != '\t') {
	 if (nodeptr != NULL)
	 *pnode++ = *p;
	 ++n;
	 }
	 if (*++p == '\0') {
	 n = 0; /* not good format, '[' not exist ']' to matching */
	 if (type != NULL)
	 *type = CONFIGNONE;
	 if (nodeptr != NULL)
	 *nodeptr = '\0';
	 break;
	 }
	 }
	 n += 1; /* for store '\0' */
	 if (type != NULL)
	 *type = CONFIGNODE;
	 if (nodeptr != NULL)
	 *pnode = '\0';
	 }
	 else if ('#' == *p || '=' == *p) {
	 n = 0;
	 if (type != NULL)
	 *type = CONFIGNONE;
	 }
	 else {
	 while (*p != '#' && *p != '\0' && *p != '\n') {
	 if ('=' == *p) {
	 flag = 1;
	 }
	 else if (*p != ' ') {
	 if (0 == flag && keyptr != NULL) {
	 *pkey++ = *p;
	 }
	 else if(1 == flag && valueptr != NULL){
	 *pval++ = *p;
	 }
	 ++n;
	 }
	 ++p;
	 }
	 n = n + (n != 0 && 0 == flag ? 1 : 0);
	 if (0 == n) {
	 if (type != NULL)
	 *type = CONFIGNONE;
	 }
	 else {
	 n += 2; /* for store '\0' */
	 if (type != NULL)
	 *type = CONFIGFIELD;
	 if (0 == flag && valueptr != NULL) {
	 *pval++ = '1';
	 }
	 if (keyptr != NULL) {
	 *pkey = '\0';
	 }
	 if (valueptr != NULL) {
	 *pval = '\0';
	 }
	 }
	
	 }
	 free(line);
	 return n;
	}
	
	CFGNODE getConfigNode(const CFG cgptr, const char * nameptr) {
	 int i = 0;
	 ConfigNode_t * cnptr;
	 char * nptr;
	 cnptr = (ConfigNode_t *)cgptr->cg_buf;
	 for (i = 0; i < cgptr->cg_count; ++i) {
	 nptr = (char *)cnptr + sizeof(ConfigNode_t);
	 if (strcmp(nameptr, nptr) == 0) {
	 return cnptr;
	 }
	 cnptr = cnptr->next;
	 }
	 return NULL;
	}
	
	char * getConfigField(CFGNODE cnptr, const char * keyptr) {
	 int i = 0;
	 char * nptr;
	 char * kptr;
	 char * vptr;
	
	 nptr = (char *)cnptr + sizeof(ConfigNode_t);
	 kptr = nptr + strlen(nptr) + 1;
	 for (i = 0; i < cnptr->cn_count; ++i) {
	 vptr = kptr + strlen(kptr) + 1;
	 if (strcmp(kptr, keyptr) == 0) {
	 return vptr;
	 }
	 kptr = vptr + strlen(vptr) + 1;
	 }
	 return NULL;
	}
	
	char * getConfigNodeField(const CFG cgptr, const char * nameptr, const char * keyptr) {
	 ConfigNode_t * cnptr;
	 if (NULL == (cnptr = getConfigNode(cgptr, nameptr))){
	 return NULL;
	 }
	 return getConfigField(cnptr, keyptr);
	}
	
	CFG readConfig(const char * fileptr) {
	 char line[MAXLINE] = "";
	 char node[MAXLINE] = "";
	 char key[MAXLINE] = "";
	 char value[MAXLINE] = "";
	 int type;
	 int nodecount = 0;
	 Config_t * cgptr = NULL;
	 ConfigNode_t * cnptr = NULL;
	 ConfigNode_t * cnprevptr = NULL;
	 char * punUsed = NULL;
	 int n = 0;
	 FILE * fp;
	 fp = fopen(fileptr, "r");
	 if (NULL == fp) {
	 return NULL;
	 }
	 while (fgets(line, sizeof(line), fp)) {
	 n += parseConfig(line, &type, NULL, NULL, NULL);
	 if (CONFIGNODE == type) ++nodecount;
	 }
	 n = n + sizeof(Config_t) + nodecount * sizeof(ConfigNode_t);
	 cgptr = (Config_t *)malloc(n);
	 cgptr->cg_count = nodecount;
	 punUsed = cgptr->cg_buf;
	 fseek(fp, 0, SEEK_SET);
	 while (fgets(line, sizeof(line), fp)) {
	 parseConfig(line, &type, node, key, value);
	 switch (type) {
	 case CONFIGNODE:
	 cnptr = (ConfigNode_t *) punUsed;
	 cnptr->cn_count = 0;
	 cnptr->next = NULL;
	 punUsed += sizeof(ConfigNode_t);
	
	 strcpy(punUsed, node);
	 punUsed += strlen(punUsed) + 1;
	
	 if (cnprevptr != NULL) {
	 cnprevptr->next = cnptr;
	 }
	 cnprevptr = cnptr;
	 break;
	 case CONFIGFIELD:
	 ++cnptr->cn_count;
	 strcpy(punUsed, key);
	 punUsed += strlen(punUsed) + 1;
	 strcpy(punUsed, value);
	 punUsed += strlen(punUsed) + 1;
	 break;
	 }
	 }
	 fclose(fp);
	 return (CFG)cgptr;
	}
	
	void closeConfig(CFG cgptr) {
	 free((char *) cgptr);
	}

	

	

	

	#include "../src/cfg.h"
	#include <stdio.h>
	
	int main(int argc, char * argv[]) {
	 CFG cfg;
	 cfg = readConfig(argv[1]);
	 printf("%s %s=%s\n",argv[2],argv[3], getConfigNodeField(cfg, argv[2], argv[3]));
	 closeConfig(cfg);
	 return 0;
	}
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