如何从C中的文件中读取每一行到一个整数数组？

Question

How do I read each line of a file opened in my C program to an integer array. I cannot use fgets and sscanf as the input is not known beforehand. The length of each row and the number of columns can vary.

Tried fscanf , fgetc , and others, but they seem to run into problems while detecting the newline. And I ended up reading the entire file together, instead of into different arrays.

eg, the file contains:

1 2 3 4 5

1 2 3

2 3 4

This should be stored in arr1[] = {1,2,3,4,5} , arr2[] = {1,2,3} , arr3[] = {2,3,4}

Answer 1

Feed characters into a per-line buffer. Upon end-of-line (ie, when you hit a newline character \\n ), tokenize the buffer with strtok or similar. Read the tokens into a pre-allocated or resizable array or struct of your choice.