filecmp.cpp

实现二个文件的比较功能.如b文件的每行在a文件中找到,则比较ok.否则比较fail.

// compare file a.txt and b.txt
// If file  b.txt contain file a.txt  result=1(OK). -1(Fail)  Result=-2(Error)
// Ver1.0 by FIC Lina 2009 4/21

#include   <stdio.h>
#include   <stdlib.h>
#include   <stdio.h>
#include   <dos.h>
#include   <conio.h>
#include   <string.h>
#include   <ctype.h>
// find str is in file.If in file return the string index address  =1 OK
//          Not find, return = -1.
//          Return -2, Error
int findstrInFile(FILE * pfile,char str[],int n)
{   FILE *pfsave;
	int strlong;
	char ch,readstr[80];
	if(n>80)
	{   printf("The Program need Update.\n");
		return -2;
	}
	for(int i=0;i<80;i++)
	{
		readstr[i]='\0';
	}
	//strlong=strlen(str);
	///////////////////////////////////////////////
	rewind(pfile); /*file start*/
	pfsave=pfile;
	ch=fgetc(pfile);
    i=0;
    while(i<n)   //read str from file
	 {
		    readstr[i]=ch;
			if(readstr[i]!=str[i])
			   {  i=0;
			    //  fgetc(pfsave);
			      pfile=pfsave;
			   }
		    else
			   {
				 i++;
				// printf("%c",str[i]);
				// getch();
			   }
			ch=fgetc(pfile);
			if(ch==EOF && i<n)
			 { //  printf(" Not Find .\n");
				return -1;
			 }
		   
	  }
  //  printf("  Find : %s\n",readstr); 
    return 1;
}

char loadfilestr[25][80];
int indexnub[25];

int loadfile(FILE *pfile)
{   int i,j;
    char ch;
	rewind(pfile);
    ch=fgetc(pfile);
	i=0;
	while(ch!=EOF)
	{  j=0;  
       while(ch!=EOF && ch!=10)  //next line
		{
          loadfilestr[i][j]=ch;
		  j++;
		  ch=fgetc(pfile);
		}
		loadfilestr[i][j]='\0';  //string end flag
		indexnub[i]=j;
        ch=fgetc(pfile);
		i++;
	}
	return i;
   
}

int main(int argc, char *argv[])
{   
	int k,rows,i,n;
	FILE *pfile,*pa,*pb;
	char strs[10]="1234567";
    if(argc!=3)
 	{
	    
		printf("\nParameters error!\n");
		printf("Usage: FileCmp.exe  a.txt    b.txt\n");
		return 0;
  	}	
   if((pa=fopen(argv[1],"rt"))==0)
	{
       printf("can not open file:  %s\n",argv[1]);
	   return -2;
	}
    if ((pb=fopen(argv[2],"rt"))==0)
	 {
      
	   printf("can not open file:  %s\n",argv[2]);
	   return -2;
	  }
    rows=loadfile(pa);
	i=0;
	//k=findstrInFile(pb, loadfilestr[i],7);  //k=1 find,k=-1 not find
	for(i=0;i<rows;i++)
	{
        k=findstrInFile(pb, loadfilestr[i],indexnub[i]);  //k=1 find,k=-1 not find
		if(k==-1)
		{   printf("\n Compare Fail !\n");
			return -1;
		}
		if(k==-2)
		{   printf("\n Error \n");
			return -2;
		}
		//getch();
	}
	printf("\n Compare OK \n");
	
	return 1;
}