Thread: MSVC getline(istream&, string&) stops program

Following my last post about the regex library of C++11/14, I did a bit of MSVC debugging and discovered regex wasn't the issue at all, but instead it was getline() from the string library. I thoroughly debugged my code and I placed breakpoints on 2 consecutive lines. No matter what I try, execution exits without error when it reaches getline()'s call.

Code:

#include <fstream>
#include <iostream>
#include <regex>
#include <string>

bool parseScript(const char * filename)
{
	std::ifstream scriptFile(filename);
	std::regex labelSyntax("([A-Z]+)([0-9]*)[ \t]+\\{(.*)\\}[\r\n]");
	std::string line;

	if (!scriptFile) return false; // breakpoint 1, this line was added during debugging with no change in behavior
	std::getline(scriptFile, line); // breakpoint 2 is never reached
	std::cout << line << std::endl;

	while (std::getline(scriptFile, line))
	{
		std::smatch m;
		if (std::regex_match(line, m, labelSyntax))
		{
			if (m[1].str() == "LANGUAGE")
				std::cout << "Locale set to " << m[3].str() << std::endl;
			else if (m[1].str() == "ITEMTOT")
				std::cout << "There are " << m[3].str() << " total items." << std::endl;
			else if (m[1].str() == "SPLTOT")
				std::cout << "There are " << m[3].str() << " total spells." << std::endl;
			else if (m[1].str() == "MOBTOT")
				std::cout << "There are " << m[3].str() << " total monsters." << std::endl;
			else if (m[1].str() == "WEPTOT")
				std::cout << "There are " << m[3].str() << " total weapons." << std::endl;
			else if (m[1].str() == "BARTOT")
				std::cout << "There are " << m[3].str() << " total barriers." << std::endl;
			else if (m[1].str() == "TRPTOT")
				std::cout << "There are " << m[3].str() << " total traps." << std::endl;
			else if (m[1].str() == "TRETOT")
				std::cout << "There are " << m[3].str() << " total treasures." << std::endl;
			else if (m[1].str() == "TELTOT")
				std::cout << "There are " << m[3].str() << " total teleports." << std::endl;
			else
			{
				switch (m[1].str()[0])
				{
					case 'I': // item
						break;
					case 'S': // spell
						break;
					case 'M': // monster
						break;
					case 'W': // weapon
						break;
					case 'B': // barrier
						break;
					case 'X': // trap
						break;
					case 'T': // treasure
						break;
					case 'P': // teleport
						break;
					case 'L': // level
						break;
					default:
						std::cerr << "Error: Unknown label" << std::endl;
						return false;
				}
			}
		}
	}
	scriptFile.close();
	return true;
}

int main(int argc, char ** argv)
{
	if (argc != 2)
	{
		std::cerr << "Usage: " << argv[0] << " <input file>" << std::endl;
		return 1;
	}
	if (!parseScript(argv[1]))
		std::cerr << "Oops!" << std::endl;
	return 0;
}

As you can see, if there was an error with the file stream itself, the function would've returned 'false' and "Oops!" would be output, but I get no output whatsoever.

I can see nothing wrong. Long shot, but have you tried uncommenting any regex code? Surely std::getline and std::ifstream have no blatant bugs in them, even in Microsoft's implementation. Mind sharing the error message and first few lines of your input file?

I've tried that with the same results unfortunately. Here's what the debugger outputs:

Code:

'ConsoleApplication1.exe' (Win32): Loaded 'C:\Users\admin\AppData\Local\Temp\ConsoleApplication1\Debug\ConsoleApplication1.exe'. Symbols loaded.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ntdll.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel32.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\KernelBase.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\vcruntime140d.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ucrtbased.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcp140d.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\advapi32.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcrt.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sechost.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rpcrt4.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sspicli.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptbase.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\bcryptprimitives.dll'. Cannot find or open the PDB file.
'ConsoleApplication1.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel.appcore.dll'. Cannot find or open the PDB file.
The thread 0x254 has exited with code 0 (0x0).
The thread 0x49c has exited with code 0 (0x0).
The thread 0x1f6c has exited with code 0 (0x0).
The program '[8040] ConsoleApplication1.exe' has exited with code 0 (0x0).

Also, first few lines of input:

Code:

LANGUAGE {English/ANSI}
LEVEL6 {}
ITEMTOT {124}
INAM1    {dagger}
IDES1    {a dagger}
ISTT1    {15 10 0 1 3 1 0 0 0 1 0 0 0 0 0 0}
IEFF1    {}

Correct. I've been trying this with both MinGW 6.1.1 and MSVC 2015

I just ran it without the debugger on cmd.exe and it prints "LANGUAGE English/ANSI" after all it seems. Not sure why it stops there though

Turns out MSVC was hiding the output. Runs fine with cmd.exe. However, now I'm stuck with std::regex not working again. Linux it runs fine but MS's std::regex, and boost::regex don't match anything. There has to be something under the hood of both if regex won't work on Win32.