RE: [Dev-C++] strstr question

[P.D. v. Z. <pd...@xs...>]

#include <iostream>
#include <fstream>
#define DEBUG 1

using namespace std;

enum { SUCCESS, FAILURE };

void printDebugMsg(char * msg);

void printDebugMsg(char * msg)
{
	// Should we be printing a msg? (is DEBUG on?)
	// No? return.
	#ifdef DEBUG
		cout << "DEBUG MSG: " << msg << endl;
	#endif
}

int main(int argc, char **argv)
{
	char dbdump_filename[1024];

	if (argc > 1)
	{
		if (argc >= 2)
		{
			strcpy(dbdump_filename, argv[1]);
		}
	} else {
		/*
		Passing in the dbdump_filename in as an argument works.
			
		But, this isn't working. Although '*dbdump_filename' seems
to hold the
right value,
		it actually looks like a pointer (not an memory address
though!)
		when you try to open the file.
		:/
		*/
		cout << "Enter db dump filename: ";
		cin.getline(dbdump_filename, 1024);
	}
	char debugMsg[1024];
	
	cout << "Db filename: " << dbdump_filename << endl;
	
	ifstream fp;
	fp.open(dbdump_filename);
	if (!fp.is_open())
	{
		cout << "Unable to open file " << dbdump_filename << endl;
		return FAILURE;
	}

	cout << "Opening file " << dbdump_filename << ".." << endl;

	int bufferSize = 10240;
	char line[bufferSize];
	char *tablename;
	char find_string[] = "CREATE TABLE";

	while (!fp.eof()) {
		fp.getline(line, bufferSize);

	//	printDebugMsg(line);
		tablename = strstr(line, find_string);
		cout << "Table Name: " << tablename;
		cout << endl;
	}
	
	fp.close();

	cout << endl;
	
	return SUCCESS;
}
 


P.S.: Didn't check the strstr() logic, never used it, and can't be bothered
to look up its signature at the moment :)


-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Chris
Sent: Monday, February 09, 2004 12:53 PM
To: dev...@li...
Subject: [Dev-C++] strstr question

Hi all,

I'm a newbie at C++ so these are probably simple answers, but I can't
work them out.

My first problem is if I don't pass an argument to the script (and
instead prompt for it), when I print it out I get weird results - which
means I can't access the filename that I type in.

My second problem is I can't work out why

tablename = strstr(line, find_string);

doesn't actually get the tablename.

Everything compiles ok, compiler is
g++ (GCC) 3.3.3 20031229 (prerelease) (Debian)


Thanks for any help offered.


The file I'm trying to parse is a simple mysql dump:

=========
DROP TABLE IF EXISTS table_a;

CREATE TABLE table_a (
a int
);

=========

My code looks like this:
==============================
#include "iostream"
#include "fstream"
#define DEBUG 1

using namespace std;

enum { SUCCESS, FAILURE };

void printDebugMsg(char * msg);

void printDebugMsg(char * msg)
{
	// Should we be printing a msg? (is DEBUG on?)
	// No? return.
	#ifdef DEBUG
		cout << "DEBUG MSG: " << msg << endl;
	#endif
}

int main(int argc, char **argv)
{
	char * dbdump_filename[1024];

	if (argc > 1)
	{
		if (argc >= 2)
		{
			*dbdump_filename = argv[1];
		}
	} else {
		/*
		Passing in the dbdump_filename in as an argument works.
			
		But, this isn't working. Although '*dbdump_filename' seems
to hold the
right value,
		it actually looks like a pointer (not an memory address
though!)
		when you try to open the file.
		:/
		*/
		cout << "Enter db dump filename: ";
		char db_filename[1024];
		cin.getline(db_filename, 1024);
		*dbdump_filename = db_filename;
	}
	char debugMsg[1024];

	cout << "Db filename: " << *dbdump_filename << endl;

	ifstream fp;
	fp.open(*dbdump_filename);
	if (!fp.is_open())
	{
		cout << "Unable to open file " << *dbdump_filename << endl;
		return FAILURE;
	}

	cout << "Opening file " << *dbdump_filename << ".." << endl;

	int bufferSize = 10240;
	char line[bufferSize];
	char * tablename;
	char find_string[] = "CREATE TABLE";

	while (!fp.eof()) {
		fp.getline(line, bufferSize);

	//	printDebugMsg(line);
		tablename = strstr(line, find_string);
		cout << "Table Name: " << tablename;
		cout << endl;
	}
	
	fp.close();

	cout << endl;
	
	return SUCCESS;
}




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