src/libstrongswan/enum.c

   1 /**
   2  * @file library.c
   3  *
   4  * @brief enum value to string conversion functions.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2006 Martin Willi
  10  * Hochschule fuer Technik Rapperswil
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  */
  22
  23 #include <stddef.h>
  24 #include <stdio.h>
  25
  26 #include "enum.h"
  27
  28 #include <printf_hook.h>
  29
  30 /**
  31  * get the name of an enum value in a enum_name_t list
  32  */
  33 static char *enum_name(enum_name_t *e, int val)
  34 {
  35         do
  36         {
  37                 if (val >= e->first && val <= e->last)
  38                 {
  39                         return e->names[val - e->first];
  40                 }
  41         }
  42         while ((e = e->next));
  43         return NULL;
  44 }
  45
  46 /**
  47  * output handler in printf() for enum names
  48  */
  49 static int print_enum(FILE *stream, const struct printf_info *info,
  50                                           const void *const *args)
  51 {
  52         enum_name_t *ed = *((enum_name_t**)(args[0]));
  53         int val = *((int*)(args[1]));
  54
  55         char *name = enum_name(ed, val);
  56
  57         if (name == NULL)
  58         {
  59                 return fprintf(stream, "(%d)", val);
  60         }
  61         else
  62         {
  63                 return fprintf(stream, "%s", name);
  64         }
  65 }
  66
  67 /**
  68  * register printf() handlers
  69  */
  70 static void __attribute__ ((constructor))print_register()
  71 {
  72         register_printf_function(PRINTF_ENUM, print_enum, arginfo_ptr_int);
  73 }