stack problem

Overview:: I'm working on a project to convert one XML format to a second XML format. Cept, the first is really bad formated XML=/ I'm forced to replace random char's in the XML file and resave it so I can parse it with a XML lib(libxml2). So far, I've only found the use of degree signs and ampersands. Problem:: For whatever reason after the class object File is destroyed I get a stack error around the var "outcome". Now, I thought it was linked to maybe a second problem; but im not sure. Also, for whatever reason, when im reading in a XML file on the 5th loop when i setstr(outcome,NULL) it also sets buffer NULL. It only happens on the 5th loop, but im sure that if I used a second XML file it would change loc in the loop. I stepped though the function many times, and none of the other buffers get set to NULL out of the blue like that. Because of it, it writes a blank "" line when it was a Element in the XML doc. Code::

include "stdafx.h"
#include "File.h"
#include "io.h"

class File {
public:

	
	File(char *docname);
	~File();
	
	void replace_char(char c,char* filler);
	//int replace_string(char*string, char* filler);


private:
	char** lines;
	int numLines;
	char* docname;
	FILE *fin,*fout;
};
File::File(char *docname) {
	fin = NULL;
	if(access(docname,00)) {
		printf("Incorrect file name, please re-run convet.exe\n");
	} else {
	printf("Loading %s...\n",docname);
	File::docname = docname;
		fin=fopen(docname,"r");
		if(!fin) 
			printf("Load failed on %s\n",docname);
		fout=fopen("TMP.xml","w");
		if(!fout)
			printf("Create TEMP file failed.\n");

	}
}

File::~File() {
	printf("Closing...\n");
	//fclose(fin);

	//fclose(fout);

	fin = NULL;
	fout = NULL;
}

void File::replace_char(char c,char * filler) {
	char buffer[1500];
	//buffer = NULL;


	char output[1500];
	//strset(output,NULL);

	char *backbuffer;
	int j=0;
	do {
		
		if(fgets(buffer,1499,fin) == NULL)
			printf("fgets error\n");


			for(int i=0;i <= (int)strlen(buffer); i++) {	
				
					if((c == '\&') && (buffer[i] == c) && (buffer[i+4] != ';')) {
						printf("ampersand found\n");
						strset(output,NULL);
						strncpy(output,buffer,i);
							
						strncpy( output+i,filler,strlen(filler)); 
						backbuffer = &buffer[strlen(output)-strlen(filler)+1];
						strncpy(output+i+strlen(filler),backbuffer,strlen(backbuffer));
						
						backbuffer = NULL;
						strset(buffer,NULL);
						strcpy(buffer,output);

						
						
					} else if((c != '\&') && (buffer[i] == c)) {
						printf("other found\n");
						strset(output,NULL);
						strncpy(output,buffer,i);
						strncpy( output+i,filler,strlen(filler)); 
						backbuffer = &buffer[strlen(output)-strlen(filler)+1];
						strncpy(output+i+strlen(filler),backbuffer,strlen(backbuffer));
						backbuffer = NULL;
						strset(buffer,NULL);
						strcpy(buffer,output);
					}
			
			}
		
		fprintf(fout,buffer);
		j++;
	} while (!feof(fin));
	fclose(fin);
	fclose(fout);
	remove(docname);
	rename("TMP.xml",docname);
}

[edited by - chbfiv on August 11, 2003 11:10:04 AM]