From 1b60671532544c98699321a323ca17d772d01de5 Mon Sep 17 00:00:00 2001
From: caballero <caballero>
Date: Wed, 3 Jun 2009 15:28:10 +0000
Subject: [PATCH] Added binary path retrieval

---
 src/creaSystem.cxx | 155 +++++++++++++++++++++++++++++++++++++++++++++
 src/creaSystem.h   |   5 +-
 2 files changed, 158 insertions(+), 2 deletions(-)

diff --git a/src/creaSystem.cxx b/src/creaSystem.cxx
index b60816c..9f917e5 100644
--- a/src/creaSystem.cxx
+++ b/src/creaSystem.cxx
@@ -1,4 +1,35 @@
 #include "creaSystem.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <iostream>
+
+#ifdef WIN32
+#include <windows.h> /* GetModuleFileName */
+#include <io.h>
+#endif /* WIN32 */
+
+#ifdef __APPLE__  /* assume this is OSX */
+#include <sys/param.h>
+#include <mach-o/dyld.h> /* _NSGetExecutablePath : must add -framework
+CoreFoundation to link line */
+#include <string.h>
+# ifndef PATH_MAX
+#  define PATH_MAX MAXPATHLEN
+# endif
+#endif /* APPLE */
+
+#ifndef PATH_MAX
+#  define PATH_MAX 2048
+#endif
+
+#if defined(WIN32)
+  #include <direct.h>
+#else
+   #include <dirent.h>  
+#endif
+
+#include <stdlib.h>
+
 
 namespace crea
 {
@@ -13,4 +44,128 @@ namespace crea
    }
 #endif
 
+int System::GetAppPath(char *pname, size_t pathsize)
+   {
+#ifdef LINUX	
+    /* Oddly, the readlink(2) man page says no NULL is appended. */
+    /* So you have to do it yourself, based on the return value: */
+    pathsize --; /* Preserve a space to add the trailing NULL */
+    long result = readlink("/proc/self/exe", pname, pathsize);
+    if (result > 0)
+	{
+		pname[result] = 0; /* add the #@!%ing NULL */
+		
+		if ((access(pname, 0) == 0))
+			return 0; /* file exists, return OK */
+		/*else name doesn't seem to exist, return FAIL (falls
+		 through) */
+	}
+#endif /* LINUX */
+    
+#ifdef WIN32
+    long result = GetModuleFileName(NULL, pname, pathsize);
+    if (result > 0)
+	{
+		/* fix up the dir slashes... */
+		int len = strlen(pname);
+		int idx;
+		for (idx = 0; idx < len; idx++)
+		{
+			if (pname[idx] == '\\') pname[idx] = '/';
+		}
+		
+		for (idx = len-1; idx >=0 ; idx--)
+		{
+			if (pname[idx] == '/')
+			{ 
+				pname[idx+1] = '\0';
+				idx = -1;
+			}
+		}
+		
+		if ((access(pname, 0) == 0))
+			return 0; /* file exists, return OK */
+		/*else name doesn't seem to exist, return FAIL (falls
+		 through) */
+	}
+#endif /* WIN32 */
+    
+#ifdef SOLARIS
+    char *p = getexecname();
+    if (p)
+	{
+		/* According to the Sun manpages, getexecname will
+		 "normally" return an */
+		/* absolute path - BUT might not... AND that IF it is not,
+		 pre-pending */
+		/* getcwd() will "usually" be the correct thing... Urgh!
+		 */
+		
+		/* check pathname is absolute (begins with a / ???) */
+		if (p[0] == '/') /* assume this means we have an
+		 absolute path */
+		{
+			strncpy(pname, p, pathsize);
+			if ((access(pname, 0) == 0))
+				return 0; /* file exists, return OK */
+		}
+		else /* if not, prepend getcwd() then check if file
+		 exists */
+		{
+			getcwd(pname, pathsize);
+			long result = strlen(pname);
+			strncat(pname, "/", (pathsize - result));
+			result ++;
+			strncat(pname, p, (pathsize - result));
+			
+			if ((access(pname, 0) == 0))
+				return 0; /* file exists, return OK */
+			/*else name doesn't seem to exist, return FAIL
+			 (falls through) */
+		}
+	}
+#endif /* SOLARIS */
+    
+#ifdef MACOSX /* assume this is OSX */
+    /*
+	 from http://www.hmug.org/man/3/NSModule.html
+	 
+	 extern int _NSGetExecutablePath(char *buf, unsigned long
+	 *bufsize);
+	 
+	 _NSGetExecutablePath  copies  the  path  of the executable
+	 into the buffer and returns 0 if the path was successfully
+	 copied  in the provided buffer. If the buffer is not large
+	 enough, -1 is returned and the  expected  buffer  size  is
+	 copied  in  *bufsize.  Note that _NSGetExecutablePath will
+	 return "a path" to the executable not a "real path" to the
+	 executable.  That  is  the path may be a symbolic link and
+	 not the real file. And with  deep  directories  the  total
+	 bufsize needed could be more than MAXPATHLEN.
+	 */
+	
+    int status = -1;
+    char *given_path = (char*)malloc(MAXPATHLEN * 2);
+    if (!given_path) return status;
+    
+    uint32_t npathsize = MAXPATHLEN * 2;
+    long result = _NSGetExecutablePath(given_path, &npathsize);
+    if (result == 0)
+	{ /* OK, we got something - now try and resolve the real path...
+	 */
+		if (realpath(given_path, pname) != NULL)
+		{
+			if ((access(pname, 0) == 0))
+				status = 0; /* file exists, return OK */
+		}
+	}
+    free (given_path);
+    return status;
+#endif /* MACOSX */
+    
+    return -1; /* Path Lookup Failed */
+} 
+
+
+
 } // namespace crea
diff --git a/src/creaSystem.h b/src/creaSystem.h
index d011190..27d07bd 100644
--- a/src/creaSystem.h
+++ b/src/creaSystem.h
@@ -3,8 +3,8 @@
   Program:   crea
   Module:    $RCSfile: creaSystem.h,v $
   Language:  C++
-  Date:      $Date: 2008/09/26 14:09:55 $
-  Version:   $Revision: 1.1 $
+  Date:      $Date: 2009/06/03 15:28:11 $
+  Version:   $Revision: 1.2 $
                                                                                 
   Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
   l'Image). All rights reserved. See Doc/License.txt or
@@ -226,6 +226,7 @@ namespace crea
   {
     /// returns true iff the program has a tty
     static int HasTTY(); 
+	static int GetAppPath(char *pname, size_t pathsize);
   };
 
 } // namespace crea
-- 
2.45.1