Linux 通用配置文件conf讀取

Linux下通用配置文件讀取

C語言版本

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
 
#define KEYVALLEN 100
 
/*   刪除左邊的空格   */
char * l_trim(char * szOutput, const char *szInput)
{
	assert(szInput != NULL);
	assert(szOutput != NULL);
	assert(szOutput != szInput);
	for (NULL; *szInput != '\0' && isspace(*szInput); ++szInput)
	{
		;
	}
	return strcpy(szOutput, szInput);
}

/*   刪除右邊的空格   */
char *r_trim(char *szOutput, const char *szInput)
{
	char *p = NULL;
	assert(szInput != NULL);
	assert(szOutput != NULL);
	assert(szOutput != szInput);
	strcpy(szOutput, szInput);
	for (p = szOutput + strlen(szOutput) - 1; p >= szOutput && isspace(*p); --p)
	{
		;
	}
	*(++p) = '\0';
	return szOutput;
}

/*   刪除兩邊的空格   */
char * a_trim(char * szOutput, const char * szInput)
{
	char *p = NULL;
	assert(szInput != NULL);
	assert(szOutput != NULL);
	l_trim(szOutput, szInput);
	for (p = szOutput + strlen(szOutput) - 1;p >= szOutput && isspace(*p); --p)
	{
		;
	}
	*(++p) = '\0';
	return szOutput;
}


int GetProfileString(char *profile, char *AppName, char *KeyName, char *KeyVal )
{
	char appname[32],keyname[32];
	char *buf,*c;
	char buf_i[KEYVALLEN], buf_o[KEYVALLEN];
	FILE *fp;
	int found=0; /* 1 AppName 2 KeyName */
	
	if( (fp=fopen( profile,"r" ))==NULL )
	{
		printf( "openfile [%s] error [%s]\n",profile,strerror(errno) );
		return(-1);
	}
	fseek( fp, 0, SEEK_SET );
	memset( appname, 0, sizeof(appname) );
	sprintf( appname,"[%s]", AppName );

	while( !feof(fp) && fgets( buf_i, KEYVALLEN, fp )!=NULL )
	{
		l_trim(buf_o, buf_i);
		if( strlen(buf_o) <= 0 )
			continue;

		buf = NULL;
		buf = buf_o;

		if( found == 0 )
		{
			if( buf[0] != '[' ) 
			{
				continue;
			} 
			else if ( strncmp(buf,appname,strlen(appname))==0 )
			{
				found = 1;
				continue;
			}
		} 
		else if( found == 1 )
		{
			if( buf[0] == '#' )
			{
				continue;
			} 
			else if ( buf[0] == '[' ) 
			{
				break;
			} 
			else 
			{
				if( (c = (char*)strchr(buf, '=')) == NULL )
					continue;

				memset( keyname, 0, sizeof(keyname) );

				sscanf( buf, "%[^=|^ |^\t]", keyname );
				if( strcmp(keyname, KeyName) == 0 )
				{
					sscanf( ++c, "%[^\n]", KeyVal );
					char *KeyVal_o = (char *)malloc(strlen(KeyVal) + 1);
					if(KeyVal_o != NULL)
					{
						memset(KeyVal_o, 0, sizeof(KeyVal_o));
						a_trim(KeyVal_o, KeyVal);
						if (KeyVal_o && strlen(KeyVal_o) > 0)
							strcpy(KeyVal, KeyVal_o);

						free(KeyVal_o);
						KeyVal_o = NULL;
					}
					found = 2;
					break;
				} 
				else 
				{
					continue;
				}
			}
		}
	}
	fclose( fp );
	if( found == 2 )
		return(0);
	else
		return(-1);
}
 
void main()
{
	char ip[16] = {0};
	GetProfileString("./cli.conf", "cls_server", "ip", ip);
	printf("%s\n",ip);
}

測試配置文件如下：

[file_server]
# ### set file_server ip ###
ip=192.1.34.2


[cls_server]
# set cls_server ip 
  ip	=	192.16.31.2
  

以上配置文件中使用不同隔離方式與符號，缺陷在於必須使用key=value模式，‘key’、‘=’、‘value’三者缺一不可。