How to read each line into an integer array, from a file in C?

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.

e.g., the file contains:

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

Nope not homework :) Was messing about with Judy arrays and was trying something out. — Egorulz
– Egorulz, Commented Sep 1, 2011 at 11:11

Alex Reynolds · Accepted Answer · 2011-09-01 22:52:51Z

2

Feed characters into a per-line buffer. Upon end-of-line (i.e., 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.

edited Sep 1, 2011 at 22:52

answered Sep 1, 2011 at 11:05

Alex Reynolds

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