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Top Forums Shell Programming and Scripting getting full path from relative path Post 302110787 by jim mcnamara on Thursday 15th of March 2007 09:58:21 AM
Old 03-15-2007
This is why relative paths have problems sometimes. There isn't a good way to handle absolutely any relative path, because all relative paths have an assumption:

the current working directory is "x".

You are assuming /home/polypus. Unix tools are designed to do one thing very well. It's hard to make a bulletproof tool because of the cwd assumption.

Because:
Obviously it may not be true.

So, there is no really elegant way to deal with it. You're onto one way to deal with it.
For programming, you should consider avoiding relative paths unless you want the code to work if and only if it runs from a certain directory.
 

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Ns_Pathname(3aolserver) 				   AOLserver Library Procedures 				   Ns_Pathname(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME
Ns_HomePath, Ns_LibPath, Ns_MakePath, Ns_ModulePath, Ns_NormalizePath, Ns_PathIsAbsolute - Pathname procedures SYNOPSIS
#include "ns.h" char * Ns_HomePath(Ns_DString *dest, ...) char * Ns_LibPath(Ns_DString *dest, ...) char * Ns_MakePath(Ns_DString *dest, ...) char * Ns_ModulePath(Ns_DString *dest, char *server, char *module, ...) char * Ns_NormalizePath(Ns_DString *dsPtr, char *path) int Ns_PathIsAbsolute(char *path) _________________________________________________________________ DESCRIPTION
These functions operate on file pathnames. They work with Unix and Windows pathnames on their respective hosts. Ns_HomePath(dest, ...) Construct a path name relative to the home directory of the server. The full path is constructed by appending the library directory followed by each of the variable number of string elements after the dest argument. The elements will be separated by a / charac- ter. The list must be terminated with a NULL string. Ns_LibPath(dest, ...) Construct a path name relative to the library directory of the server, normally the lib/ subdirectory of the home directory. The full path is constructed by appending the library directory followed by each of the variable number of string elements after the dest argument. The elements will be separated by a / character. The list must be terminated with a NULL string. Ns_MakePath(dest, ...) Construct a path name from a list of path elements. The Ns_MakePath function constructs a path name by appending a list of path ele- ments to the given Ns_DString. The path elements are separated by single slashes, and the resulting path name is appended to the given Ns_DString. The last argument needs to be NULL to indicate the end of the argument list. Ns_ModulePath(dest, char *server, char *module, ...) Construct a server and/or module specific pathname relative to the server home directory. The path in constructed by first append- ing the server home directory. Next, if the server argument is not NULL, "server/servere appended to the destination and if the module argument is not NULL, "module/module" will be appended. Finally, all other string elements, if any, will be appended to the destination with separating / characters. The list must be terminated with a NULL string. Ns_NormalizePath(dsPtr, path) Normalize a path name. This function removes any extraneous slashes from the path and resolves "." and ".." references. The result is appended to the given Ns_DString. The following code appends "/dog" to the Ns_DString: Ns_NormalizePath(&ds, "/dog/cat/../../rat/../../dog//mouse/.."); Ns_PathIsAbsolute(path) Check for an absolute path name. Return NS_TRUE if the path is absolute and NS_FALSE otherwise. Under Unix, an absolute path starts with a "/". On Windows, it starts with a drive letter followed immediately by a ":". SEE ALSO
nsd(1), info(n) KEYWORDS
AOLserver 4.0 Ns_Pathname(3aolserver)
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