cgi.cpp

#include <iostream>
#include <string>
#include <fstream>
#include "include/libhtml++.h"

using namespace std;

char *cgi::anfrage(char *formname)
{

char *request = getenv("REQUEST_METHOD");

if( NULL == request )
{ 
	return NULL;	
}

else if( strcmp(request, "GET") == 0 )
{
      query = getenv("QUERY_STRING");
}

if( query == "0")
{
	return NULL;
}

int start;
int end;

start = query.find(formname);
if (query.find(formname) !=string::npos )
{
return NULL;
}

start += 1;

if (query.find("&", start) !=string::npos )

{
end = query.rfind(formname, end);
}
else
{
end = query.find("&", start);
end -= 1;
}

query.substr(start,end);
query.copy(formname,string::npos);
return (formname);

}

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

class cgi
{
private:
string  query;
public:
char *anfrage(char *formname);
};

class htmlformsubmit
{
private:
void inputsubmit( string submitname);
public:
htmlformsubmit(string submitname)
{
inputsubmit(submitname);
};

};

class htmlformselect
{
private:
void formselectdisplay(string formselectname, string formselectinput, string methodform);
public:
htmlformselect(string formselectname, string formselectinput, string methodform)
{
formselectdisplay (formselectname, formselectinput, methodform);
};

};

#include <iostream> 
#include <fstream>
#include <string>
#include "include/css.h"
#include <tuxcms/libhtml++.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>

using namespace std;

void libcss::libcssread()
{
		folder = "style";
		n = scandir(folder, &namelist, 0 , alphasort);
           if (n < 0)
               perror("No style folder");
           else {
		while(n--){
			folders +=( "<option>");
			folders +=( namelist[n]->d_name);
			folders +=( "</option>");
			delete(namelist[n]);
			}
		htmlformselect::htmlformselect("cssstyle", folders , "GET");
		htmlformsubmit::htmlformsubmit("Switch Design");
		}

delete(namelist);
}

void libcss::libcssout()
{
cgi css;
string cssstyle;
cssstyle = css.cgi::anfrage("cssstyle");

cout << "<link rel=\"stylesheet\" type=\"text/css\" href=\"" << folder << "/" << cssstyle << "/"<< "main.css" << "\">" << endl;
};

link zu quellcode vom programm:
ftp://tuxist.de/tuxist/tuxcms.tar.gz

gdb output:

(gdb) bt
#0  0x00002b878a678640 in strlen () from /lib/libc.so.6
#1  0x00002b8789f0dd8c in std::string::operator= ()
   from /usr/lib/libstdc++.so.6
#2  0x00002b8789c4518b in libcss::libcssout () from /usr/lib/tuxcms/libcss.so
#3  0x0000000000400e54 in libcss::libcss ()
#4  0x0000000000400d4b in main ()

makefile libcss:

CXX=g++
CXXFLAGS= -c -Wall -fpic -L/usr/lib/ -I/usr/include
CXXFLAGS1= -shared -o libcss.so
LIBPATH= /usr/lib/tuxcms/libhtml++.so

lib_SRC= \
	css.cpp

lib_OBJS= \
	css.o

all:
	$(CXX) $(CXXFLAGS)   $(lib_SRC)  
	$(CXX) $(CXXFLAGS1)  $(lib_OBJS) $(LIBPATH)

install:
	mkdir -p /usr/lib/tuxcms/
	mkdir -p /usr/include/tuxcms/
	cp libcss.so /usr/lib/tuxcms/libcss.so
	cp include/css.h /usr/include/tuxcms/

remove:
	rm /usr/lib/tuxcms/libcss.so
	rm /usr/include/tuxcms/css.h

makefile libhtml:

CXX=g++
CXXFLAGS= -Wall -c  -fpic -L/usr/lib/ -I/usr/include -Iinclude
CXXFLAGS1= -shared -o libhtml++.so -Wall

lib_SRC= \
	htmlform.cpp \
	cgi.cpp 
lib_OBJS= \
	htmlform.o \
	cgi.o

all:
	$(CXX) $(CXXFLAGS) $(lib_SRC)
	$(CXX) $(CXXFLAGS1)  $(lib_OBJS)

install:
	mkdir -p /usr/lib/tuxcms/
	mkdir -p /usr/include/tuxcms/
	cp libhtml++.so /usr/lib/tuxcms/libhtml++.so
	cp include/libhtml++.h /usr/include/tuxcms/libhtml++.h

remove:
	rm /usr/lib/tuxcms/libhtml++.so
	rm /usr/include/tuxcms/libhtml++.h

makefile cgi-bin

CXX= /usr/bin/g++
CXXFLAGS= -c -Wall -fsigned-char -L/usr/lib/ -I/usr/include/tuxcms
CXXFLAGS1= -o index.cgi -Wl
LIBPATH= /usr/lib/tuxcms/libhtml++.so /usr/lib/tuxcms/libcss.so

lib_SRC= \
	index.cpp
lib_OBJS= \
	index.o
all:
	$(CXX) $(CXXFLAGS)  $(lib_SRC) 
	$(CXX) $(CXXFLAGS1) $(lib_OBJS) $(LIBPATH)

debug:
	$(CXX) $(CXXFLAGS)  $(lib_SRC) 
	$(CXX) $(CXXFLAGS1) $(lib_OBJS) $(LIBPATH) -g

Das funktioniert so nicht. Wenn QUERY_STRING nicht gesetzt ist, liefert getenv einen 0-Zeiger, den Du dem operator= von std::string übergibst. Da stürzt er ab. Das sieht man auch im gdb-backtrace.