C/C++:文件对碰

比对两个输出文件，然后输出不同的地方，用于测试，算法题实在找不出bug的地方。

/*
* 20171030
*/

#include <cstdio>
#include <cstring>

using namespace std;

#define maxn 1000

const char colorA[10] = "\e[01;31m";
const char colorB[10] = "\e[01;34m";
const char colorC[10] = "\e[01;32m";
const char colorS[10] = "\e[0m";
const char keyA = '\r';
const char keyB = '\n';

char filenameA[100];
char filenameB[100];
FILE* fileAp = NULL;
FILE* fileBp = NULL;

char ansA[maxn];
char ansB[maxn];
int res[maxn];
int linenum = 0;
int colA = 0;
int colB = 0;

void solve()
{
    int lenA = strlen(ansA);
    int lenB = strlen(ansB);
    if(lenA!=lenB)
    { 
        printf("line:%d %s(A)%s(A) %s(B)%s(B) %s\n",linenum,colorA,ansA,colorB,ansB,colorS);
        return ;
    }
    memset(res,0,sizeof(res));
    bool flag = true;
    for(int i=0;i<lenA;i++) if(ansA[i]!=ansB[i]){ res[i] = 1;flag = false;}
    if(flag) return ;
    printf("line:%d %s(A)",linenum,colorA);
    for(int i=0;i<lenA;i++) 
        if(res[i]==1) printf("%s%c%s",colorC,ansA[i],colorA);
        else printf("%c",ansA[i]);
    printf("(A) %s (B)",colorB);
    for(int i=0;i<lenA;i++) 
        if(res[i]==1) printf("%s%c%s",colorC,ansB[i],colorB);
        else printf("%c",ansB[i]);
    printf("(B)%s\n",colorS);
}

int main(int argc,char** argv)
{
    if(argc<3)
    {
        printf("%sError :: %sNeed Two filename%s\n",colorA,colorB,colorS);
        return 0;
    }
    strcpy(filenameA,argv[1]);
    strcpy(filenameB,argv[2]);
    fileAp = fopen(filenameA,"r");
    fileBp = fopen(filenameB,"r");
    if(fileAp==NULL)
    {
        printf("%sError :: %scan not find file named '%s'.%s\n",colorA,colorB,filenameA,colorS);
        return 0;
    }   
    if(fileBp==NULL)
    {
        printf("%sError :: %scan not find file named '%s'.%s\n",colorA,colorB,filenameB,colorS);
        return 0;
    }
    char a;
    char b;
    while(fscanf(fileAp,"%c",&a)!=EOF&&fscanf(fileBp,"%c",&b)!=EOF)
    {
        memset(ansA,0,sizeof(ansA));
        memset(ansB,0,sizeof(ansB));
        linenum++;
        colA = 0;
        colB = 0;

        if(a!=keyB)
        {
            ansA[colA++] = a;
            while(fscanf(fileAp,"%c",&a)!=EOF&&a!=keyB) ansA[colA++] = a;
        }

        if(b!=keyB)
        {
            ansB[colB++] = b;
            while(fscanf(fileBp,"%c",&b)!=EOF&&b!=keyB) ansB[colB++] = b;
        }

        solve();
    }
    printf("\n%sThe A End\n",colorA);
    while(fscanf(fileAp,"%c",&a)!=EOF) printf("%c",a);
    printf("\n%sThe B End\n",colorB);
    while(fscanf(fileBp,"%c",&b)!=EOF) printf("%c",b);
    printf("%s\n",colorS);
    fclose(fileAp);
    fclose(fileBp);
    return 0;
}