#include <stdio.h>
#include <stdlib.h>


int main() {
	FILE *fp;                    // file pointer
	float *data;                 // data pointer (array of floats)
	int i, file_size, arr_size;
	char filename[2049];

	printf("Enter filename to read: ");
	scanf("%2048s", filename);

	fp = fopen(filename, "rb");
	if (fp == NULL) {
		printf("Failed to open file\n");
		return 1;
	}

	// get file size (technically isn't the best way because SEEK_END is undefined behaviour:
	//
	// "Library implementations are allowed to not meaningfully support SEEK_END
	// (therefore, code using it has no real standard portability)."
	// ~ https://cplusplus.com/reference/cstdio/fseek/
	//
	// " Setting the file position indicator to end-of-file, as with fseek(file, 0, SEEK_END),
	// has undefined behavior for a binary stream (because of possible trailing null characters) or
	// for any stream with state-dependent encoding that does not assuredly end in the initial shift
	// state. "
	// ~ https://port70.net/~nsz/c/c11/n1570.html#note268
	//
	// it is also limited to 2GB files as it returns a signed integer
	// better to use something like this probably:
	// https://stackoverflow.com/a/238609
	//
	// but louise uses fseek so i will too
	fseek(fp, 0, SEEK_END);
	file_size = ftell(fp);
	arr_size = file_size/sizeof(float);
	rewind(fp);

	// allocate memory and read data
	data = malloc(file_size);
	fread(data, sizeof(float), arr_size, fp);

	for (i = 0; i < arr_size; i++) {
		printf("%d %0.3f\n", i, data[i]);
	}

	free(data);
}