The following is taken from K&R's book "The C Programming
Language", page 165, 1st edition:

/* fgets: get at most n char from iop */
char *fgets(char *s, int n, FILE *iop)
{
   register int c;
   register char *cs;

   cs = s;
   while (--n > 0 && (c = getc(iop)) != EOF)
      if ((*ds++ = c) == '\n')
         break;

   *cs = '\0';
   return (c == EOF && cs == s) ? NULL : s;
}

Note: fgets reads the next input line (includeing the newline) from the
file iop into the character array s, at most n-1 characters will be read.
gets deletes the terminal '\n' and puts adds it.

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