my getline

#include <stdio.h>
#include <stdlib.h>
#define CHUNK 16
#define NULL_CHECK(p) if (p == NULL) return NULL

char* stdinGetLine() {
  char *line = NULL, ch;
  int i = 0, currAlloc = 0;
  while ((ch = getchar()) != EOF) {
    if (i == currAlloc) {
      currAlloc += CHUNK;
      line = realloc(line, sizeof(char) * currAlloc);
      NULL_CHECK(line);
    }
    if (ch != '\n') {
      *(line + i) = ch;
    } else {
      break;
    }
    i++;
  }
  if (i == currAlloc) {
    currAlloc++;
    line = realloc(line, sizeof(char) * currAlloc);
  }

  NULL_CHECK(line);

  *(line + i) = 0;
  return line;
}

int main(void) {
  char *s = stdinGetLine();
  if (s == NULL) {
    perror("Error!");
    return 0;
  }
  puts(s);
  free(s);
  s = NULL;
  return 0;
}