一个通用的linux系统中C语言版读取配置文件的函数。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>#define KEYVALLEN 100/* 删除左边的空格 */
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);
}/* 删除右边的空格 */
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;
}/* 删除两边的空格 */
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);elsereturn(-1);
}void main()
{char ip[16];GetProfileString("./cls.conf", "cls_server", "ip", ip);printf("%s\n",ip);
}
配置文件例子如下：
[cls_server] #配置文件等号左右可以有空格也可以没有 ip=192.16.31.2
