Getting line by line an integer stream to different arrays - arrays

Question

I have the following inputs:
23 34 43 56 45
100 73
I want to input these two strings in different arrays integer arrays using pointer since the input size is apriori unknown.
I have written the following code, but I cannot get the integers into any of the two arrays.
#include <stdio.h>
#include <stdlib.h>
#define lent(x) (sizeof(x) / sizeof(x[0]))
#define Malloc(n, type) (type *)malloc((unsigned)((n) * sizeof(type)))
#define Realloc(ptr, n, type) (type *)realloc(ptr, (n) * sizeof(type))
void getInt_Stream(int *ptr)
{
int i = 0;
ptr = Malloc(i+1, int);
char c;
scanf("%c", &c);
while ((c != EOF) && (c != '\n'))
{
if (c >= '0' && c <= '9')
{
ptr[i] = ptr[i] * 10 + (c - '0');
}
else if (c == ' ')
{
i++;
ptr = Realloc(ptr, i+1,int);
ptr[i] = 0;
}
scanf("%c", &c);
}
}
int main()
{
int *arr1, *arr2;
getInt_Stream(arr1);
getInt_Stream(arr2);
int n1 = lent(arr1);
for (int i = 0; i < n1; i++)
{
printf(" arr1[%d] =%d\n", i, *(arr1+i));
}
return 0;
}
Also, I am getting some errors and warnings when I compile the program using
gcc prog.c -o prog -Wall -Wextra.
Please help with some hints. Thanks in advance.

Answer 1

Would you please try the following:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* get integer values from the file stream
* return the pointer to the array of integers
* the size of the array is stored in *n
*/
int *
getInt_Stream(FILE *fp, int *n)
{
char str[BUFSIZ]; // line buffer of the input stream
char *tk; // pointer to each token
char delim[] = " "; // delimiter of the tokens
int *arr = NULL; // array of intergers
int count = 0; // token counter
if (NULL == (fgets(str, BUFSIZ, fp))) {
// read a line and assign str
perror("fgets");
exit(1);
}
for (tk = strtok(str, delim); tk != NULL; tk = strtok(NULL, delim)) {
// get token one by one
if (NULL == (arr = realloc(arr, (count + 1) * sizeof(int)))) {
// allocate memory for the array
perror("realloc");
exit(1);
}
arr[count] = (int)strtol(tk, (char **)NULL, 10);
// assign the array element to int
count++;
}
*n = count; // number of the elements
return arr; // pointer to the array
}
int
main(int argc, char *argv[])
{
int *arr1, *arr2;
int n1, n2;
char *filename = argv[1];
FILE *fp;
int i;
if (argc != 2) {
fprintf(stderr, "usage: %s file.txt\n", argv[0]);
exit(1);
}
if (NULL == (fp = fopen(filename, "r"))) {
perror(filename);
exit(1);
}
arr1 = getInt_Stream(fp, &n1);
for (i = 0; i < n1; i++) {
printf("arr1[%d] = %d\n", i, arr1[i]);
}
arr2 = getInt_Stream(fp, &n2);
for (i = 0; i < n2; i++) {
printf("arr2[%d] = %d\n", i, arr2[i]);
}
free(arr1);
free(arr2);
fclose(fp);
return 0;
}
Output for the provided file:
$ ./a.out file.txt
arr1[0] = 23
arr1[1] = 34
arr1[2] = 43
arr1[3] = 56
arr1[4] = 45
arr2[0] = 100
arr2[1] = 73