summaryrefslogtreecommitdiff
path: root/Source/cmTimestamp.cxx
blob: ac26503c65a395af73119ae4ef4b546aa443c3d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2012 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#include "cmTimestamp.h"

#include <cstring>

#include <sys/types.h>
#include <sys/stat.h>

//----------------------------------------------------------------------------
std::string cmTimestamp::CurrentTime(
  const std::string& formatString, bool utcFlag)
{
  time_t currentTimeT = time(0);
  if(currentTimeT == time_t(-1))
    {
    return std::string();
    }

  return CreateTimestampFromTimeT(currentTimeT, formatString, utcFlag);
}

//----------------------------------------------------------------------------
std::string cmTimestamp::FileModificationTime(const char* path,
  const std::string& formatString, bool utcFlag)
{
  struct stat info;
  memset(&info, 0, sizeof(info));

  if(stat(path, &info) != 0)
    {
    return std::string();
    }

  return CreateTimestampFromTimeT(info.st_mtime, formatString, utcFlag);
}

//----------------------------------------------------------------------------
std::string cmTimestamp::CreateTimestampFromTimeT(time_t timeT,
    std::string formatString, bool utcFlag)
{
  if(formatString.empty())
    {
    formatString = "%Y-%m-%dT%H:%M:%S";
    if(utcFlag)
      {
      formatString += "Z";
      }
    }

  struct tm timeStruct;
  memset(&timeStruct, 0, sizeof(timeStruct));

  struct tm* ptr = (struct tm*) 0;
  if(utcFlag)
    {
    ptr = gmtime(&timeT);
    }
  else
    {
    ptr = localtime(&timeT);
    }

  if(ptr == 0)
    {
    return std::string();
    }

  timeStruct = *ptr;

  std::string result;
  for(std::string::size_type i = 0; i < formatString.size(); ++i)
    {
    char c1 = formatString[i];
    char c2 = (i+1 < formatString.size()) ?
      formatString[i+1] : static_cast<char>(0);

    if(c1 == '%' && c2 != 0)
      {
      result += AddTimestampComponent(c2, timeStruct);
      ++i;
      }
    else
      {
      result += c1;
      }
    }

  return result;
}

//----------------------------------------------------------------------------
std::string cmTimestamp::AddTimestampComponent(
  char flag, struct tm& timeStruct)
{
  std::string formatString = "%";
  formatString += flag;

  switch(flag)
    {
    case 'd':
    case 'H':
    case 'I':
    case 'j':
    case 'm':
    case 'M':
    case 'S':
    case 'U':
    case 'w':
    case 'y':
    case 'Y':
      break;
    default:
      {
      return formatString;
      }
    }

  char buffer[16];

  size_t size = strftime(buffer, sizeof(buffer),
    formatString.c_str(), &timeStruct);

  return std::string(buffer, size);
}