source/fs/dir.cpp

   1 #include <cstdlib>
   2 #include <unistd.h>
   3 #include <dirent.h>
   4 #include <msp/core/systemerror.h>
   5 #include <msp/strings/regex.h>
   6 #include <msp/strings/utils.h>
   7 #include "dir.h"
   8 #include "path.h"
   9 #include "stat.h"
  10 #include "utils.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace FS {
  16
  17 namespace
  18 {
  19
  20 enum
  21 {
  22 #ifdef WIN32
  23         ITEMSEP = ';'
  24 #else
  25         ITEMSEP = ':'
  26 #endif
  27 };
  28
  29 /** Helper function to determine the location of the program's executable.
  30 Caches the last result to cut down filesystem access with repeated calls. */
  31 const Path &get_bin_dir(const string &argv0)
  32 {
  33         static string last_argv0;
  34         static Path bin_dir;
  35
  36         if(!(argv0==last_argv0))
  37         {
  38                 Path exe;
  39                 if(argv0.find('/')==string::npos)
  40                 {
  41                         const char *path = getenv("PATH");
  42                         vector<string> dirs = split(path, ITEMSEP);
  43                         for(vector<string>::const_iterator i=dirs.begin(); i!=dirs.end(); ++i)
  44                                 if(exists(Path(*i)/argv0))
  45                                 {
  46                                         exe = realpath(Path(*i)/argv0);
  47                                         break;
  48                                 }
  49                 }
  50                 else
  51                         exe = realpath(argv0);
  52
  53                 last_argv0 = argv0;
  54                 bin_dir = dirname(exe);
  55         }
  56
  57         return bin_dir;
  58 }
  59
  60 }
  61
  62
  63 not_a_directory::not_a_directory(const Path &p):
  64         runtime_error(p.str())
  65 { }
  66
  67
  68 void mkpath(const Path &path, int mode)
  69 {
  70         Path p;
  71         for(Path::Iterator i=path.begin(); i!=path.end(); ++i)
  72         {
  73                 p /= *i;
  74 #ifdef WIN32
  75                 if(p.size()==1 && p.is_absolute())
  76                         continue;
  77 #endif
  78                 if(FS::Stat st = stat(p))
  79                 {
  80                         if(!st.is_directory())
  81                                 throw not_a_directory(p);
  82                         continue;
  83                 }
  84                 else
  85                         mkdir(p, mode);
  86         }
  87 }
  88
  89 void rmpath(const Path &path)
  90 {
  91         list<string> files = list_files(path);
  92         for(list<string>::iterator i=files.begin(); i!=files.end(); ++i)
  93         {
  94                 Path p = path / *i;
  95                 if(is_dir(p))
  96                         rmpath(p);
  97                 else
  98                         unlink(p);
  99         }
 100
 101         rmdir(path);
 102 }
 103
 104 list<string> list_files(const Path &path)
 105 {
 106         return list_filtered(path, string());
 107 }
 108
 109 list<string> list_filtered(const Path &path, const string &filter)
 110 {
 111         Regex r_filter(filter);
 112
 113         list<string> result;
 114         DIR *dir = opendir(path.str().c_str());
 115         if(!dir)
 116                 throw system_error("opendir");
 117
 118         while(dirent *de = readdir(dir))
 119         {
 120                 const char *fn = de->d_name;
 121                 if(fn[0]=='.' && (fn[1]==0 || (fn[1]=='.' && fn[2]==0)))
 122                         continue;
 123                 if(r_filter.match(fn))
 124                         result.push_back(fn);
 125         }
 126         closedir(dir);
 127
 128         return result;
 129 }
 130
 131 Path getcwd()
 132 {
 133         char buf[1024];
 134         return ::getcwd(buf, sizeof(buf));
 135 }
 136
 137 Path get_sys_conf_dir(const string &argv0)
 138 {
 139         Path dir = get_bin_dir(argv0);
 140
 141         if(dir[-1]=="bin" || dir[-1]=="sbin")
 142         {
 143                 dir /= "..";
 144                 if(dir[-1]=="usr")
 145                         dir /= "..";
 146                 return dir/"etc";
 147         }
 148         else
 149                 return dir;
 150 }
 151
 152 Path get_sys_data_dir(const string &argv0, const string &appname)
 153 {
 154         Path dir = get_bin_dir(argv0);
 155
 156         if(dir[-1]=="bin" || dir[-1]=="sbin")
 157                 return dir/".."/"share"/appname;
 158         else if(dir[-1]=="MacOS")
 159                 return dir/".."/"Resources";
 160         else
 161                 return dir;
 162 }
 163
 164 Path get_sys_lib_dir(const string &argv0, const string &appname)
 165 {
 166         Path dir = get_bin_dir(argv0);
 167
 168         if(dir[-1]=="bin" || dir[-1]=="sbin")
 169                 return dir/".."/"lib"/appname;
 170         else
 171                 return dir;
 172 }
 173
 174 void chdir(const Path &path)
 175 {
 176         if(::chdir(path.str().c_str())==-1)
 177                 throw system_error("chdir");
 178 }
 179
 180 } // namespace FS
 181 } // namespace Msp