Line data    Source code

       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2020 Taler Systems SA
       4             : 
       5             :   TALER is free software; you can redistribute it and/or modify it under the
       6             :   terms of the GNU General Public License as published by the Free Software
       7             :   Foundation; either version 3, or (at your option) any later version.
       8             : 
       9             :   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
      10             :   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
      11             :   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
      12             : 
      13             :   You should have received a copy of the GNU General Public License along with
      14             :   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
      15             : */
      16             : /**
      17             :  * @file lang.c
      18             :  * @brief Utility functions for parsing and matching RFC 7231 language strings.
      19             :  * @author Christian Grothoff
      20             :  */
      21             : #include "taler/platform.h"
      22             : #include "taler/taler_util.h"
      23             : 
      24             : /**
      25             :  * Check if @a value matches the @a accept_pattern.
      26             :  *
      27             :  * @param accept_pattern a pattern like "[text|STAR/]*[text|STAR]"
      28             :  * @param value the value to match
      29             :  * @return true if @a value matches the @a accept_pattern
      30             :  */
      31             : static bool
      32           7 : pattern_matches (const char *accept_pattern,
      33             :                  const char *value)
      34             : {
      35             :   const char *da;
      36             :   const char *dm;
      37             : 
      38           7 :   if (0 == strcmp ("*",
      39             :                    accept_pattern))
      40           0 :     return true;
      41           7 :   if (0 == strcmp (value,
      42             :                    accept_pattern))
      43           5 :     return true;
      44           2 :   da = strchr (accept_pattern,
      45             :                '/');
      46           2 :   dm = strchr (value,
      47             :                '/');
      48           2 :   if ( (NULL == da) ||
      49             :        (NULL == dm) )
      50           0 :     return false;
      51           2 :   if ( ( (1 == da - accept_pattern) &&
      52           0 :          ('*' == *accept_pattern) ) ||
      53           2 :        ( (da - accept_pattern == dm - value) &&
      54           0 :          (0 == strncasecmp (accept_pattern,
      55             :                             value,
      56           0 :                             da - accept_pattern)) ) )
      57           0 :     return pattern_matches (da + 1,
      58             :                             dm + 1);
      59           2 :   return false;
      60             : }
      61             : 
      62             : 
      63             : double
      64           7 : TALER_pattern_matches (const char *pattern,
      65             :                        const char *value)
      66             : {
      67           7 :   char *p = GNUNET_strdup (pattern);
      68             :   char *sptr;
      69           7 :   double r = 0.0;
      70             : 
      71           7 :   for (char *tok = strtok_r (p, ",", &sptr);
      72          14 :        NULL != tok;
      73           7 :        tok = strtok_r (NULL, ",", &sptr))
      74             :   {
      75             :     char *sptr2;
      76           7 :     char *lp = strtok_r (tok, ";", &sptr2);
      77           7 :     char *qp = strtok_r (NULL, ";", &sptr2);
      78           7 :     double q = 1.0;
      79             : 
      80           7 :     if (NULL == lp)
      81           0 :       continue;
      82           7 :     while (isspace ((int) *lp))
      83           0 :       lp++;
      84           7 :     while (NULL != qp)
      85             :     {
      86           0 :       while (isspace ((int) *qp))
      87           0 :         qp++;
      88           0 :       if (1 == sscanf (qp,
      89             :                        "q=%lf",
      90             :                        &q))
      91           0 :         break;
      92           0 :       qp = strtok_r (NULL, ";", &sptr2);
      93             :     }
      94           7 :     if (pattern_matches (lp,
      95             :                          value))
      96           5 :       r = GNUNET_MAX (r, q);
      97             :   }
      98           7 :   GNUNET_free (p);
      99           7 :   return r;
     100             : }
     101             : 
     102             : 
     103             : /* end of lang.c */