exc.hpp

#ifndef __EXC_HPP_INCLUDED__
#define __EXC_HPP_INCLUDED__

#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cstdarg>
#include <cerrno>

#include <exception>

namespace imgdupl
{

#if defined __GNUC__ || defined __clang__
#define CHECK_PRINTF_ARGS(f, e) __attribute__((format(printf, f, e)))
#else
#define CHECK_PRINTF_ARGS(f, e)
#endif

class Exc : public std::exception
{
public:
    Exc(const char* file, int line, const char* fmt, ...) CHECK_PRINTF_ARGS(4, 5)
    {
        va_list ap;
        char buff[512];

        va_start(ap, fmt);
        vsnprintf(buff, sizeof(buff), fmt, ap);
        va_end(ap);

        snprintf(msg, sizeof(msg), "%s:%i %s", sanitize_file_name(file), line, buff);
    }

    virtual ~Exc() throw()
    {
    }

    virtual const char* what() const throw()
    {
        return msg;
    }

private:
    char msg[512];

    Exc()
    {
    }

    const char* sanitize_file_name(const char* file)
    {
        const char* s;
        char* p;

        p = const_cast<char*>(strrchr(file, '/'));

        if (p == NULL) {
            s = file;
        } else {
            p++;
            s = p;
        }

        return s;
    }
};

#define THROW_EXC(args...) (throw Exc(__FILE__, __LINE__, args))

#define THROW_EXC_IF_FAILED(status, args...)                                                                                               \
    do {                                                                                                                                   \
        if (!(status)) {                                                                                                                   \
            throw Exc(__FILE__, __LINE__, args);                                                                                           \
        }                                                                                                                                  \
    } while (0)

} // namespace

#endif