# include <stdio.h>
# include <stdlib.h>
# include <assert.h>
# include "getword.h"

int getword (FILE *fp, char *buf, size_t size,
	     int first (char), int rest (char))
{
  int c;
  size_t i, max;

  assert (fp && buf && size && first && rest);

  max = size - 1;

  /* search for beginning of word */
  while ((c = getc (fp)) != EOF && first (c) == 0)
    ;

  if (c == EOF)
    return EOF;

  /* read the word */
  i = 0;
  do {
    /* store characters as long as this is possible */
    if (i < max)
      buf [i++] = c;
  } while ((c = getc (fp)) != EOF && rest (c));

  /* terminate string */
  buf [i] = '\0';

  /* push last character back */
  if (c != EOF)
    ungetc (c, fp);

  return i;
}