Style update: spaces around assignments

[libs/core.git] / source / utils.cpp

diff --git a/source/utils.cpp b/source/utils.cpp
index 0ca1d6064e1bd2cfcfa48bd8a3b649efc7333ca0..694a8f12a6c6c67b4f77dd89e0e9a8168d1fcf1e 100644 (file)
--- a/source/utils.cpp
+++ b/source/utils.cpp
@@ -6,6 +6,7 @@ Distributed under the LGPL
 */
 
 #include <cerrno>
+#include <cstdio>
 #include <msp/core/except.h>
 #ifndef WIN32
 #include <fnmatch.h>
@@ -15,6 +16,7 @@ Distributed under the LGPL
 #include <msp/strings/utils.h>
 #include "dir.h"
 #include "path.h"
+#include "stat.h"
 #include "utils.h"
 
 using namespace std;
@@ -29,18 +31,24 @@ string basename(const Path &p)
 
 Path dirname(const Path &p)
 {
+       if(p.size()==1)
+       {
+               if(p.is_absolute())
+                       return p;
+               return ".";
+       }
        return p.subpath(0, p.size()-1);
 }
 
 string basepart(const string &fn)
 {
-       unsigned dot=fn.rfind('.');
+       unsigned dot = fn.rfind('.');
        return fn.substr(0, dot);
 }
 
 string extpart(const string &fn)
 {
-       unsigned dot=fn.rfind('.');
+       string::size_type dot = fn.rfind('.');
        if(dot==string::npos)
                return string();
        return fn.substr(dot);
@@ -48,36 +56,94 @@ string extpart(const string &fn)
 
 Path fix_case(const Path &path)
 {
-       bool found=true;
+       bool found = true;
        Path result;
        for(Path::Iterator i=path.begin(); i!=path.end(); ++i)
        {
                if(!found || *i=="/")
-                       result/=*i;
+                       result /= *i;
                else
                {
                        list<string> files;
                        if(result.size())
-                               files=list_files(result);
+                               files = list_files(result);
                        else
-                               files=list_files(".");
+                               files = list_files(".");
 
-                       found=false;
+                       found = false;
                        for(list<string>::iterator j=files.begin(); (j!=files.end() && !found); ++j)
                                if(!strcasecmp(*j,*i))
                                {
-                                       result/=*j;
-                                       found=true;
+                                       result /= *j;
+                                       found = true;
                                }
 
                        if(!found)
-                               result/=*i;
+                               result /= *i;
                }
        }
 
        return result;
 }
 
+Path readlink(const Path &link)
+{
+#ifdef WIN32
+       (void)link;
+       throw Exception("No symbolic links on win32");
+#else
+       char buf[4096];
+       int len = ::readlink(link.str().c_str(), buf, sizeof(buf));
+       if(len==-1)
+               throw SystemError("readlink failed", errno);
+       return string(buf, len);
+#endif
+}
+
+Path realpath(const Path &path)
+{
+#ifdef WIN32
+       if(path.is_absolute())
+               return path;
+       else
+               return getcwd()/path;
+#else
+       list<string> queue(path.begin(), path.end());
+       if(!path.is_absolute())
+       {
+               Path cwd = getcwd();
+               queue.insert(queue.begin(), cwd.begin(), cwd.end());
+       }
+
+       Path real;
+       unsigned n_links = 0;
+       while(!queue.empty())
+       {
+               Path next = real/queue.front();
+               queue.pop_front();
+
+               struct stat st = lstat(next);
+               if(S_ISLNK(st.st_mode))
+               {
+                       if(++n_links>64)
+                               throw Exception("Ludicrous amount of symlinks detected in realpath, giving up");
+                       Path link = readlink(next);
+                       queue.insert(queue.begin(), link.begin(), link.end());
+               }
+               else
+                       real = next;
+       }
+
+       return real;
+#endif
+}
+
+void rename(const Path &from, const Path &to)
+{
+       if(::rename(from.str().c_str(), to.str().c_str())==-1)
+               throw SystemError("rename failed", errno);
+}
+
 void unlink(const Path &path)
 {
        if(::unlink(path.str().c_str())==-1)
@@ -86,15 +152,31 @@ void unlink(const Path &path)
 
 Path relative(const Path &path, const Path &base)
 {
-       Path::Iterator i=path.begin();
-       Path::Iterator j=base.begin();
+       Path::Iterator i = path.begin();
+       Path::Iterator j = base.begin();
        for(; (i!=path.end() && j!=base.end() && *i==*j); ++i, ++j) ;
 
        Path result;
        for(; j!=base.end(); ++j)
-               result/="..";
+               result /= "..";
+       for(; i!=path.end(); ++i)
+               result /= *i;
+
+       return result;
+}
+
+int descendant_depth(const Path &path, const Path &parent)
+{
+       Path::Iterator i = path.begin();
+       Path::Iterator j = parent.begin();
+       for(; (i!=path.end() && j!=parent.end() && *i==*j); ++i, ++j) ;
+
+       if(j!=parent.end())
+               return -1;
+       
+       int result = 0;
        for(; i!=path.end(); ++i)
-               result/=*i;
+               ++result;
 
        return result;
 }