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       1                 :            : /* Conversion UCS-4 to UTF-8.
       2                 :            :    Copyright (C) 2002, 2006-2007, 2009-2012 Free Software Foundation, Inc.
       3                 :            :    Written by Bruno Haible <bruno@clisp.org>, 2002.
       4                 :            : 
       5                 :            :    This program is free software: you can redistribute it and/or modify it
       6                 :            :    under the terms of the GNU General Public License as published
       7                 :            :    by the Free Software Foundation; either version 3 of the License, or
       8                 :            :    (at your option) any later version.
       9                 :            : 
      10                 :            :    This program is distributed in the hope that it will be useful,
      11                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      12                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13                 :            :    General Public License for more details.
      14                 :            : 
      15                 :            :    You should have received a copy of the GNU General Public License
      16                 :            :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      17                 :            : 
      18                 :            : #include <config.h>
      19                 :            : 
      20                 :            : /* Specification.  */
      21                 :            : #include "unistr.h"
      22                 :            : 
      23                 :            : int
      24                 :        165 : u8_uctomb_aux (uint8_t *s, ucs4_t uc, int n)
      25                 :            : {
      26                 :            :   int count;
      27                 :            : 
      28         [ +  + ]:        165 :   if (uc < 0x80)
      29                 :            :     /* The case n >= 1 is already handled by the caller.  */
      30                 :        128 :     return -2;
      31         [ +  + ]:         37 :   else if (uc < 0x800)
      32                 :          3 :     count = 2;
      33         [ +  + ]:         34 :   else if (uc < 0x10000)
      34                 :            :     {
      35 [ +  + ][ -  + ]:         24 :       if (uc < 0xd800 || uc >= 0xe000)
      36                 :          4 :         count = 3;
      37                 :            :       else
      38                 :         20 :         return -1;
      39                 :            :     }
      40                 :            : #if 0
      41                 :            :   else if (uc < 0x200000)
      42                 :            :     count = 4;
      43                 :            :   else if (uc < 0x4000000)
      44                 :            :     count = 5;
      45                 :            :   else if (uc <= 0x7fffffff)
      46                 :            :     count = 6;
      47                 :            : #else
      48         [ +  + ]:         10 :   else if (uc < 0x110000)
      49                 :          5 :     count = 4;
      50                 :            : #endif
      51                 :            :   else
      52                 :          5 :     return -1;
      53                 :            : 
      54         [ +  + ]:         12 :   if (n < count)
      55                 :          9 :     return -2;
      56                 :            : 
      57   [ +  +  +  - ]:          3 :   switch (count) /* note: code falls through cases! */
      58                 :            :     {
      59                 :            : #if 0
      60                 :            :     case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000;
      61                 :            :     case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000;
      62                 :            : #endif
      63                 :          1 :     case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
      64                 :          2 :     case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
      65                 :          3 :     case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
      66                 :          3 :   /*case 1:*/ s[0] = uc;
      67                 :            :     }
      68                 :        165 :   return count;
      69                 :            : }