util.cpp

// $Id: util.cpp,v 1.11 2016-01-13 16:21:53-08 - - $

#include <cstdlib>
#include <unistd.h>

using namespace std;

#include "debug.h"
#include "util.h"

int exit_status::status = EXIT_SUCCESS;
static string execname_string;

void exit_status::set(int new_status)
{
    status = new_status;
}

int exit_status::get()
{
    return status;
}

void execname(const string& name)
{
    execname_string = name.substr(name.rfind('/') + 1);
    DEBUGF('u', execname_string);
}

string& execname()
{
    return execname_string;
}

bool want_echo()
{
    constexpr int CIN_FD{ 0 };
    constexpr int COUT_FD{ 1 };
    bool cin_is_not_a_tty = not isatty(CIN_FD);
    bool cout_is_not_a_tty = not isatty(COUT_FD);
    DEBUGF('u', "cin_is_not_a_tty = " << cin_is_not_a_tty << 
        ", cout_is_not_a_tty = " << cout_is_not_a_tty);
    return cin_is_not_a_tty or cout_is_not_a_tty;
}

wordvec split(const string& line, const string& delimiters)
{
    wordvec words;
    size_t end = 0;

    // Loop over the string, splitting out words, and for each word
    // thus found, append it to the output wordvec.
    for (;;) {
        size_t start = line.find_first_not_of(delimiters, end);
        if (start == string::npos)
            break;
        end = line.find_first_of(delimiters, start);
        words.push_back(line.substr(start, end - start));
    }
    DEBUGF('u', words);
    return words;
}

ostream& complain()
{
    exit_status::set(EXIT_FAILURE);
    cerr << execname() << ": ";
    return cerr;
}