C解析config

#cat bb.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#define KEYVALLEN 100
/*   Delete left side blank   */
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);
}
/*   Delete right side blank   */
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;
}
/*   Delete both side blank   */
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];
	char dev[10];
	GetProfileString("./bb.txt", "cls_server", "ip", ip);
	GetProfileString("./bb.txt", "device", "dev", dev);
	printf("%s\n", ip);
	printf("%s\n", dev);
}

#cat bb.txt
[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
[device]
dev=sda