Jump to next line in .txt file in C - c

Question

I need to make some actions from txt file.
What I was willing to do:
Calculate number of lines in txt
Open txt file
Iterate for each line
Iterate within each line and perform the task within it
Close file
Current code:
int lines(){
FILE *fp = fopen("somedata.txt","r");
int ch;
int count=0;
do{
ch = fgetc(fp);
if( ch== '\n') count++;
}
while( ch != EOF );
fclose(fp);
return count;
}
int main(){
int linesnum=lines();
FILE *fp = fopen("somedata.txt", "r");
if (fp == 0){
fprintf(stderr, "failed to open test0.txt\n");
exit(-1);
}
float areas[linesnum];
for (int j=0;j<linesnum;j++){
float array[150];
for (int i = 0; i < 150; i++){
fscanf(fp, "%f", &array[i]);
if (getc(fp) == (int)'\n'){
//that ends iteration for a line once it founds "\n"
//and assigns its value to temporary array
break;
}
}
//SOME TASK PERFORMED OVER HERE FOR EACH LINE lets say calculate average
if (getc(fp) == EOF){ //That's supposed to be end of iteration through lines
break;
}
}
fclose(fp);
return 0;
}
File is in format (max lines 1000, max elements in each line is 150).
Number of elements in each line is different, so if I make a big matrix of 1000x150, most of elements will be empty; that's why I don't want a matrix, and just simply want perform task for each line.
1 2 3 4 5 6
1 3 2 5 6 7 3 5
1 3 3 2 5 2 3
5 3 4 2 52 5 6
Well, I'm ending up with error Segmentation fault: 11 after performing task for 1st line.
I'm not sure how do I jump to next line after 1st iteration. That's the question.
Any thoughts?
UPDATE: Just had to get rid of EOF break thing in main():
if (getc(fp) == EOF){
break;
}

Answer 1

Something like this may work.
Read a line with fgets. The line must be large enough to hold the longest line.
Use a pointer to line and an offset to parse the values from the line.
%n will receive the number of bytes used by the sscanf so the pointer can be advanced to the next value.
char line[1500];
char *pline;
int used = 0;
int i = 0;
int linesnum = 0;
float array[150];
while ( fgets ( line, sizeof ( line), fp))) {
pline = line;
i = 0;
while ( ( sscanf ( pline, "%f%n", &array[i], &used)) == 1) {
pline += used;
i++;
if ( i >= 150) {
break;
}
}
linesnum++;
if ( linesnum >= 1000) {
break;
}
}