From a74c677c09774c02d3bc347525fb071f25d25697 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Mon, 25 Apr 2005 16:27:12 +0000
Subject: 1. bumped version to 0.0.1

2. added utility functions extracted from sitecing
---
diff --git a/configure.ac b/configure.ac
index 96d9325..33d1a59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([konforka], [0.0], [konforka-bugs@klever.net])
+AC_INIT([konforka], [0.0.1], [konforka-bugs@klever.net])
 AC_CONFIG_SRCDIR([include/konforka/exception.h])
 AC_CONFIG_HEADER([config.h])
 AM_INIT_AUTOMAKE([dist-bzip2])
diff --git a/include/Makefile.am b/include/Makefile.am
index 3e043d3..5fbf85e 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -6,6 +6,7 @@ endif
 
 nobase_include_HEADERS = \
 	konforka/exception.h \
+	konforka/util.h \
 	konforka/basic_wrapper.h konforka/responsible_wrapper.h \
 	konforka/resource_pile.h \
 	konforka/pointer_map.h \
diff --git a/include/konforka/util.h b/include/konforka/util.h
new file mode 100644
index 0000000..c06edd9
--- a/dev/null
+++ b/include/konforka/util.h
@@ -0,0 +1,103 @@
+#ifndef __KONFORKA_UTIL_H
+#define __KONFORKA_UTIL_H
+
+#include <sys/types.h>
+#include <string>
+#include <konforka/exception.h>
+
+/**
+ * @file
+ * @brief miscellaneous utility stuff.
+ */
+
+/**
+ * @brief The main konforka namespace.
+ */
+namespace konforka {
+    using std::string;
+
+    class restricted_sequence_error : public konforka::exception {
+	public:
+	    restricted_sequence_error(const string& fi,const string& fu,int l,const string& w)
+		: konforka::exception(fi,fu,l,w) { }
+    };
+
+    /**
+     * normalize_path options enumeration.
+     * @see normalize_path()
+     */
+    enum normalize_path_options {
+	/**
+	 * Restrict the /../ sequence.
+	 */
+	restrict_dotdot = 1,
+	/**
+	 * Strip out the leading slash.
+	 */
+	strip_leading_slash = 2,
+	/**
+	 * Strip out the trailing slash.
+	 */
+	strip_trailing_slash = 4
+    };
+
+    /**
+     * Normalize pathname by stripping duplicate slashes, etc.
+     * @param p the pathname.
+     * @param o options.
+     * @return the normalized path.
+     * @see normalize_path_options
+     * @todo TODO: document exceptions.
+     */
+    string normalize_path(const string& p,int o=(restrict_dotdot|strip_trailing_slash));
+
+    /**
+     * Extract the directory part of the filename.
+     * @param p the pathname.
+     * @return the directory part.
+     */
+    string dir_name(const string& p);
+
+    class beyond_root_error : public konforka::exception {
+	public:
+	    beyond_root_error(const string& fi,const string& fu,int l,const string& w)
+		: konforka::exception(fi,fu,l,w) { }
+    };
+
+    /**
+     * combine_path options enumeration.
+     * @see combine_path()
+     */
+    enum combine_path_options {
+	/**
+	 * The origin is file. Otherwise it is directory.
+	 */
+	origin_is_file = 1,
+	/**
+	 * Fail if we've gone up beyond root.
+	 */
+	fail_beyond_root = 2
+    };
+
+    /**
+     * Combine path with the relative path.
+     * @param orig the origin.
+     * @param rel relative path to combine with.
+     * @param o options.
+     * @return the paths combined.
+     * @see combine_path_options
+     * @todo TODO: document exceptions.
+     */
+    string combine_path(const string& orig,const string& rel,int o=origin_is_file);
+
+    /**
+     * Create directory and parent directories if needed.
+     * @param p the pathname.
+     * @param m mode value for the newly created directories.
+     */
+    void make_path(const string& p,mode_t m);
+
+}
+
+ /* vim:set ft=cpp: */
+#endif /* __KONFORKA_UTIL_H */
diff --git a/lib/Makefile.am b/lib/Makefile.am
index a904569..7d44856 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -12,5 +12,6 @@ endif
 
 libkonforka_la_SOURCES = \
 	exception.cc \
+	util.cc \
 	pointer_map.cc \
 	${EXTRA_SOURCES}
diff --git a/lib/util.cc b/lib/util.cc
new file mode 100644
index 0000000..74039c6
--- a/dev/null
+++ b/lib/util.cc
@@ -0,0 +1,127 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <konforka/util.h>
+
+namespace konforka {
+
+    /*
+     * XXX: this code is borrowed from sitecing as is, although it should be optimized.
+     */
+
+    string normalize_path(const string& p,int o) {
+	const char *s = p.c_str();
+	if( s[0]=='.' && s[1]=='/' )
+	    s += 2; // skip leading './'
+	if(o&strip_leading_slash)
+	    for(;(*s)=='/';s++);
+	string rv;
+	string::size_type notslash = 0;
+	for(;*s;s++) {
+	    if(s[0]=='/') {
+		if(s[1]=='/')
+		    continue; // skip duplicate slash
+		if(s[1]=='.' && s[2]=='/') {
+		    // '/./' sequence encountered
+		    s += 2;
+		    continue;
+		}
+	    }
+	    if(
+	       (o&restrict_dotdot) && (
+		( rv.empty() && s[0]=='.' && s[1]=='.' && s[2]=='/' ) // '^../'
+		||
+		( s[0]=='/' && s[1]=='.' && s[2]=='.' && (s[3]=='/' || s[3]==0) ) // '/../' or '/..$'
+	       )
+	      )
+		throw restricted_sequence_error(CODEPOINT,"restricted updir (..) sequence encountered");
+	    rv += *s;
+	    if( (*s) !='/' )
+		notslash = rv.length();
+	}
+	if(!(o&strip_trailing_slash))
+	    notslash++;
+	if(notslash<rv.length())
+	    rv.erase(notslash); // XXX: does this operation have enough sense to be performed?
+	return rv;
+    }
+
+    string dir_name(const string& p) {
+	string::size_type sl = p.find_last_of('/');
+	if(sl==string::npos)
+	    return ""; // no slashes -- no dir.
+	string::size_type nosl = p.find_last_not_of('/',sl);
+	if(nosl==string::npos)
+	    return ""; // only slashes -- no dir.
+	return p.substr(0,nosl+1);
+    }
+
+    string combine_path(const string& orig,const string& rel,int o) {
+	string r = normalize_path(rel,0);
+	if(r.empty()) {
+	    // XXX: this behaviour is questionable.
+	    return normalize_path( (o&origin_is_file)?dir_name(orig):orig, strip_leading_slash|restrict_dotdot|strip_trailing_slash);
+	}
+	string rv;
+	if(r[0]=='/') {
+	    r.erase(0,1);
+	}else{
+	    rv = normalize_path( (o&origin_is_file)?dir_name(orig):orig, restrict_dotdot|strip_trailing_slash);
+	}
+	string::size_type lsl = rv.rfind('/');
+	// iterate through slashes in relative path
+	for(string::size_type sl=r.find('/');sl!=string::npos;sl=r.find('/')) {
+	    assert(sl!=0); // sure we don't start with '/' at this point
+	    if(sl==1 && r[0]=='.') { // './'
+		r.erase(0,2);
+	    }else if(sl==2 && r[0]=='.' && r[1]=='.') { // '../'
+		if(lsl==string::npos) {
+		    if(rv.empty() && (o&fail_beyond_root))
+			throw beyond_root_error(CODEPOINT,"went beyond root while combining path");
+		    rv.clear();
+		}else{
+		    rv.erase(lsl);
+		    lsl = rv.rfind('/');
+		}
+		r.erase(0,3);
+	    }else{ // 'something/'
+		lsl = rv.length();
+		rv += '/';
+		rv += r.substr(0,sl);
+		r.erase(0,sl+1);
+	    }
+	}
+	if(r.empty())
+	    return rv+'/';
+	if(r.length()==2 && r[0]=='.' && r[1]=='.') {
+	    if(lsl==string::npos) {
+		if(rv.empty() && (o&fail_beyond_root))
+		    throw beyond_root_error(CODEPOINT,"went beyond root while combining path");
+		return "/";
+	    }else{
+		rv.erase(lsl+1);
+		return rv;
+	    }
+	}
+	rv += '/';
+	rv += r;
+	return rv;
+    }
+
+    void make_path(const string& p,mode_t m) {
+	struct stat st;
+	for(string::size_type sl=0;sl!=string::npos;sl=p.find('/',sl+1)) {
+	    if(!sl)
+		continue;
+	    string pp = p.substr(0,sl);
+	    if(stat(pp.c_str(),&st) || !S_ISDIR(st.st_mode)) {
+		if(mkdir(pp.c_str(),m))
+		    throw konforka::system_error(CODEPOINT,"failed to mkdir()");
+	    }
+	}
+	if(stat(p.c_str(),&st) || !S_ISDIR(st.st_mode)) {
+	    if(mkdir(p.c_str(),m))
+		throw konforka::system_error(CODEPOINT,"failed to mkdir()");
+	}
+    }
+    
+}
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