tlm_helpers.h revision 12027:1eb7dc7aa10b 
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3  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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6  Accellera licenses this file to you under the Apache License, Version 2.0
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10    http://www.apache.org/licenses/LICENSE-2.0
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14  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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19
20/* ---------------------------------------------------------------------------------------
21 @file tlm_helpers.h
22
23 @brief
24
25  Original Authors:
26    Charles Wilson, ESLX
27
28--------------------------------------------------------------------------------------- */
29
30#ifndef __TLM_HELPERS_H__
31#define __TLM_HELPERS_H__
32
33//#include <sys/param.h>
34//#include <cstring>
35
36namespace tlm {
37
38enum tlm_endianness { TLM_UNKNOWN_ENDIAN, TLM_LITTLE_ENDIAN, TLM_BIG_ENDIAN };
39
40inline tlm_endianness get_host_endianness(void)
41{
42  static tlm_endianness host_endianness = TLM_UNKNOWN_ENDIAN;
43
44  if (host_endianness == TLM_UNKNOWN_ENDIAN) {
45    unsigned int number = 1;
46    unsigned char *p_msb_or_lsb = (unsigned char*)&number;
47
48    host_endianness = (p_msb_or_lsb[0] == 0) ? TLM_BIG_ENDIAN : TLM_LITTLE_ENDIAN;
49  }
50  return host_endianness;
51}
52
53inline bool host_has_little_endianness(void)
54{
55  static tlm_endianness host_endianness = TLM_UNKNOWN_ENDIAN;
56  static bool host_little_endian = false;
57
58  if (host_endianness == TLM_UNKNOWN_ENDIAN) {
59    unsigned int number = 1;
60    unsigned char *p_msb_or_lsb = (unsigned char*)&number;
61
62    host_little_endian = (p_msb_or_lsb[0] == 0) ? false : true;
63  }
64
65  return host_little_endian;
66}
67
68inline bool has_host_endianness(tlm_endianness endianness)
69{
70  if (host_has_little_endianness()) {
71    return endianness == TLM_LITTLE_ENDIAN;
72
73  } else {
74    return endianness == TLM_BIG_ENDIAN;
75  }
76}
77
78} // namespace tlm
79
80#endif /* __TLM_HELPERS_H__ */
81