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

enum { MAXLINE = 1000 };

size_t calc() {
  char line[MAXLINE], c;
  size_t size = 0;
  while ( (c = getchar()) != EOF && c != '\n') {
    line[size] = c;
    size++;
    if (size >= MAXLINE)
      break;
  }
  return size;
}

int main(void) {
  size_t size = calc();
  if (!size) {
    /* Handle invalid size */
  }
  char * line = malloc(size)
  /* ... */
  free(line); 
}