fgets and strtok in a double "for" loop - c

Question

I'm trying to extract the content of a file into a matrix but the file may look completely differently.
For exemple all these files should give the same result : a 3x3 matrix containing 1,2,3,4,5,6,7,8,9.
1 2 3
4 5 6
7 8 9
1 2 3
4 5 6
7 8 9
1 2 3 4
5
6
7 8
9
1 2 3
$something
$something else
4 5 6
$something else else
7 8 9
Hopefully I know the dimensions of the matrix beforehand as well as the "$" character that indicates that these lines are to be ignored in the current process.
My current algorithm using fscanf works great but It can't work with the "$something" lines.
I figured that I should use the fgets/strtok/sscanf method but there are some issues.
// File* file (already assigned)
char line[32]; //assuming 32 is enough
char* token;
fgets(line,32,file);
token = strtok(line," \t");
for (y=0; y<ySize; y++)
{
for (x=0; x<xSize, x++)
{
if (token[0] == '$') //should use a str function
{
fgets(line,32,file);
token = strtok(line," \t")
x--;
}
else
{
if (we are at the end of the line)
{
fgets(line,32,file);
token = strtok(line," \t")
}
sscanf(token,"%d",&matrix[x][y];
token = strtok(NULL," \t");
}
}
}
Basically I'd like to have some help to write the "if (we are at the end of the line)" condition and some input on my method, is it flawless? Did I correctly thought of the process?
Thank you.

Answer 1

You should use getline instead of fgets to make things easier. The latter is unreliable. The test condition that you are looking for is:
token == NULL;
Check this: "Once the terminating null character of str has been found in a call to strtok, all subsequent calls to this function with a null pointer as the first argument return a null pointer."

Answer 2

You can easily parse without strtok() by using strspn() / strcspn(), and sscanf()s "%n" specifier. Also: there was a ',' in the original code where a ';' should have been.
#include <stdio.h>
#include <string.h>
#define XSIZE 3
#define YSIZE 3
int matrix[XSIZE][YSIZE];
int main(void)
{
char line[200];
int pos,eat,xx,yy, rc;
xx = yy =0;
while ( fgets(line, sizeof line, stdin) ) {
if (line[0] == '$') continue;
for(pos=0; line[pos]; pos += eat) {
pos += strspn(line+pos, " \t\n");
rc =sscanf(line+pos, "%d%n", &matrix[xx][yy], &eat);
if (rc < 1) break;
if (++xx >= XSIZE ) {xx = 0; if(++yy >= YSIZE) goto done; }
}
}
done:
/* show it to the world ... */
for (yy = 0; yy < YSIZE; yy++) {
for (xx = 0; xx < XSIZE; xx++) {
fprintf (stdout, " %d", matrix[xx][yy] );
}
fprintf (stdout, "\n" );
}
return 0;
}