error.cc

来自「一个mips虚拟机非常好代码,使用C++来编写的,希望大家多学学,」· CC 代码 · 共 72 行

#include <errno.h>
#include <stdarg.h>
#include <string.h>
#include "error.hh"
#include "sulima.hh"


// Construct an error message from a printf-like template.
Error::Error(const char *m, ...)
{
    va_list ap;
    va_start(ap, m);
    if (vecho(msg, sizeof(msg), m, ap) >= sizeof(msg))
	strcpy(msg + sizeof(msg) - 5, "...");
    va_end(ap);
}


// An empty virtual destructor.
Error::~Error()
{
    // nothing to do.
}


// Access to the message string.
const char *
Error::what() const
{
    return msg;
}


// Return a "cascaded exception" message.
const char *
Error::cascaded()
{
    return "Cascaded exception detected.";
}


// Print an out-of-memory message. This is worth special-casing.
const char *
OutOfMemory::what() const
{
    return "Out of memory.";
}


// A generic error message stored in `errno'.

SysError::SysError()
    : ec(errno)
{
    // done.
}

const char *
SysError::what() const
{
    return strerror(ec);
}


// A file-related SysError.

FileError::FileError(const char *name)
    : Error("%s: %s", name, strerror(errno))
{
    // done.
}