c - Extract lines containing a string from a file into another file without using strstr

Question

So if input.txt is:

abd123
123gy
dhakf
hu123

and target string is "123"

I need the result.txt to be:

abd123
123gy
hu123

I would use something like

while(fscanf(fp1, target, ...) != 0)
      fputs(target, fp2);

I have to do this without using functions of string.h.

question from:https://stackoverflow.com/questions/65840293/extract-lines-containing-a-string-from-a-file-into-another-file-without-using-st

Answer 1

I would use getline to read every line of the file and use strstr to check if it contains the line that you are looking for. That should be enough to go off, good luck :)