utility.c

MD5、RSA加解密,主要用在Linux環境執行。有編寫makefile提供編譯

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "utility.h"

void WriteLog( char *fmt,... )
{
    FILE *fp;
    time_t tval;
    struct tm *now;
    va_list args;
	char szLog[1024];
	char szDateTime[25];
	
    if ( ( fp =fopen( "/var/log/nas.log", "a" ) ) !=NULL )
    {
        tval = time( NULL );
        now = localtime( &tval );
        fprintf( fp,"[%d/%02d/%02d %d:%02d:%02d]",
			now->tm_mon+1, now->tm_mday, now->tm_year+1900,now->tm_hour, now->tm_min, now->tm_sec );
        va_start( args,fmt );
		vsprintf(szLog,fmt,args);
        vfprintf( fp, fmt, args );
        fprintf( fp, "\n" );
		printf("%s\n",szLog);
        fclose( fp );
        va_end( args );
    }	
}

int gettoken(char* string,int pos,char* delimit,char* value)
{
    char strTmp[256],strData[256];
    char* pstrTmp,*pstrData;
    int i;

    if (strlen(string)==0) {
        return 0;
    }

    pstrTmp = strTmp;
    pstrData = strData;
    strcpy(strTmp,string);
#ifdef _DEBUG
    printf("String=%s,pos=%d,delimit=%s\n",strTmp,pos,delimit);
#endif
    pstrData = strtok(strTmp,delimit);
	if (pos==1) {
        if (pstrData==NULL) {
            return 0;
        }
		strcpy(value,pstrData);
		return 1;
	}
    i = 1;
    while (pstrData=strtok(NULL,delimit)) {
        i++;
        if (i==pos) {
            strcpy(value,pstrData);
            return i;
        }
    }
    return 0;
}

void truncateCRLF(char* string)
{
    int i;

    if (strlen(string)==0)
      return;
    for (i=0;i<=strlen(string)-1;i++) {
		if ( (*(string+i) == 0x0d) || (*(string+i) == 0x0a) ) {
			*(string+i) = 0;
			break;
		}
	}
}

void trimR_space(char* string)
{
	int counter;
	for (counter=strlen(string)-1; string[counter] == ' '; counter--);
	string[counter+1] = (char) NULL;
}

void trimL_space(char* string)
{
	int counter;
	for (counter=0; string[counter] == ' '; counter++);
	strcpy(string,&string[counter]);
}

void trim_space(char* string)
{
	trimR_space(string);
	trimL_space(string);
}

void get_param_value(FILE* f,char* param,char* value,char* delim)
{
	char strTmp[256],strParam[128],strValue[128];
	char *param_n, *data;

	param_n = strParam;
	data = strValue;
    fseek(f,0,SEEK_SET);
    while (fgets(strTmp,256,f)!=NULL) {
        truncateCRLF(strTmp);
        gettoken(strTmp,1,delim,param_n);
        trim_space(strParam);
        if (strcmp(strParam,param)==0) {
            gettoken(strTmp,2,delim,data);
            strcpy(value,strValue);
        }
		#ifdef _DEBUG
		printf("Read data from file : %s,%s\n",strTmp,strParam);
		#endif

	}
}