问从文件中读取字符。C语言

EN

X   1   0   1
1   X   X   1
1   0   1   0

1   1   0   X
0   X   1   1
1   X   1   0  

char cha2[1];
int patternStored[180];
for(a=0;a<(numberOfPatterns*12);a++)
    {
        fscanf(patternMatFile,"%1s",cha2);
        if(cha2[0]=='X')
        {
            patternStored[a]=2;
        }
        else
        {
            patternStored[a]=atoi(cha2);
        }
    }

Run-Time Check Failure #2 - Stack around the variable 'cha2' was corrupted.

char cha[4];
int patternStored[180];
for(a=0;a<(numberOfPatterns*12);a++)
    {
        fscanf(patternMatFile,"%c",cha);
        if(cha[0]=='X')
        {
            patternStored[a]=2;
        }
        else
        {
            patternStored[a]=atoi(cha);
        }
    }