1  /*
       2   * unparse.c -- convert a UUID to string
       3   *
       4   * Copyright (C) 1996, 1997 Theodore Ts'o.
       5   *
       6   * %Begin-Header%
       7   * Redistribution and use in source and binary forms, with or without
       8   * modification, are permitted provided that the following conditions
       9   * are met:
      10   * 1. Redistributions of source code must retain the above copyright
      11   *    notice, and the entire permission notice in its entirety,
      12   *    including the disclaimer of warranties.
      13   * 2. Redistributions in binary form must reproduce the above copyright
      14   *    notice, this list of conditions and the following disclaimer in the
      15   *    documentation and/or other materials provided with the distribution.
      16   * 3. The name of the author may not be used to endorse or promote
      17   *    products derived from this software without specific prior
      18   *    written permission.
      19   *
      20   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
      21   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      22   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
      23   * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
      24   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
      25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
      26   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
      27   * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      28   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      29   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
      30   * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
      31   * DAMAGE.
      32   * %End-Header%
      33   */
      34  
      35  #include <stdio.h>
      36  #include "c.h"
      37  
      38  #include "uuidP.h"
      39  
      40  static char const hexdigits_lower[16] = "0123456789abcdef";
      41  static char const hexdigits_upper[16] = "0123456789ABCDEF";
      42  
      43  static void uuid_fmt(const uuid_t uuid, char *buf, char const *restrict fmt)
      44  {
      45  	char *p = buf;
      46  	int i;
      47  
      48  	for (i = 0; i < 16; i++) {
      49  		if (i == 4 || i == 6 || i == 8 || i == 10) {
      50  			*p++ = '-';
      51  		}
      52  		size_t tmp = uuid[i];
      53  		*p++ = fmt[tmp >> 4];
      54  		*p++ = fmt[tmp & 15];
      55  	}
      56  	*p = '\0';
      57  }
      58  
      59  void uuid_unparse_lower(const uuid_t uu, char *out)
      60  {
      61  	uuid_fmt(uu, out, hexdigits_lower);
      62  }
      63  
      64  void uuid_unparse_upper(const uuid_t uu, char *out)
      65  {
      66  	uuid_fmt(uu, out, hexdigits_upper);
      67  }
      68  
      69  void uuid_unparse(const uuid_t uu, char *out)
      70  {
      71  #ifdef UUID_UNPARSE_DEFAULT_UPPER
      72  	uuid_fmt(uu, out, hexdigits_upper);
      73  #else
      74  	uuid_fmt(uu, out, hexdigits_lower);
      75  #endif
      76  }