readlines.c

size_t
readlines(FILE* in, char ***items) {
  char buf[BUFSIZ], *p;
  size_t i, size = 0;

  /* read each line from stdin and add it to the item list */
  for(i = 0; fgets(buf, sizeof buf, in); i++) {
    if(i+1 >= size / sizeof **items)
      if(!(*items = realloc(*items, (size += BUFSIZ))))
        die("cannot realloc %u bytes:", size);

    if((p = strchr(buf, '\n')))
      *p = '\0';

    if(!((*items)[i] = strdup(buf)))
      die("cannot strdup %u bytes:", strlen(buf)+1);
  }

  if(*items)
    (*items)[i] = NULL;

  return i;
}