Thread: How do I scan patterns?

fgets() + sscanf() - same as always.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>


#define size 25


main()
{
time_t start, Totalstart;
time_t finish, Totalfinish;
int matrix[size][size];
int patterntxt[size][size];
int parent[size][size];
int i,j;
int m,n;
int Xcoordinate;
int Ycoordinate;
int pattern=0;
int num=1;
int a;


FILE *MatrixA;
FILE *Patterns;


MatrixA = fopen("MatrixA.txt","w");
/*It's a rand() generated. Not going to show here.*/
fclose(MatrixA);


/*Scanning the patterns*/
ParentMatrix = fopen("MatrixA.txt","r"); 
Patterns = fopen("Patterns.txt","r");


/*Pattern starts*/
do
{
printf("Pattern can be found at "); 


for(m=0; m!='='; m++)/*Get pattern from Patterns.txt*/
{
    for(n=0; n!='\0'; n++)
    {
for(i=0; i<size; i++)/*Get from MatrixA.txt*/
    {
        for(j=0; j<size; j++)
        {
            fscanf(ParentMatrix, "%d ", &parent[i][j]);
            fscanf(Patterns, "%d ", &patterntxt[m][n]);
            time(&start);
            if (parent[i][j]==patterntxt[m][n] && parent[i][j+1]==patterntxt[m][n+1] && parent[i][j+2]==patterntxt[m][n+2] && parent[i+1][j]==patterntxt[m+1][n] && parent[i+1][j+1]==patterntxt[m+1][n+1] && parent[i+1][j+2]==patterntxt[m+1][n+2] && parent[i+2][j]==patterntxt[m+2][n] && parent[i+2][j+1]==patterntxt[m+2][n+1] && parent[i+2][j+2]==patterntxt[m+2][n+2])
            {
                 /*printf something*/
            }
            else
            {
                pattern=0;
            }
            time(&finish);
        }
    }
             printf("\nNumber of patterns found: %d\n", pattern);
            printf("Time Taken: %.6f seconds\n", difftime(finish,start));
     }
}
}while(patterntxt[m][n]!='=');
/*end of Pattern*/




 printf("Search Done!\n");
 fclose(MatrixA);
fclose(Patterns);
 }

FileA...

1 1
1 1
*****
0 0
0 0
*****
2 2
2 2

Please help!

That's why you read a line using fgets(), then use sscanf() (or whatever) when the line is in memory.

fscanf() works well when the data is a known format, but if you have a variable format, it doesn't work so well.

Code:

char buff[BUFSIZ];
while ( fgets( buff, BUFSIZ, fp ) != NULL ) {
  if ( buff[0] == '*' ) {
    // line beginning with * - do something
  } else
  if ( sscanf( buff, "%d %d", &x, &y ) == 2 ) {
    // line containing 2 ints - do something
  } else {
    // some other crap
  }
}