зеркало из https://github.com/mozilla/gecko-dev.git
133 строки
3.0 KiB
C++
133 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include <cstdarg>
|
|
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#else
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <cstring>
|
|
#include "mozilla/Assertions.h"
|
|
#include "mozilla/unused.h"
|
|
|
|
/* Template class allowing a limited number of increments on a value */
|
|
template <typename T>
|
|
class CheckedIncrement
|
|
{
|
|
public:
|
|
CheckedIncrement(T aValue, size_t aMaxIncrement)
|
|
: mValue(aValue), mMaxIncrement(aMaxIncrement)
|
|
{}
|
|
|
|
T operator ++(int)
|
|
{
|
|
if (!mMaxIncrement) {
|
|
MOZ_CRASH("overflow detected");
|
|
}
|
|
mMaxIncrement--;
|
|
return mValue++;
|
|
}
|
|
|
|
T& operator ++()
|
|
{
|
|
(*this)++;
|
|
return mValue;
|
|
}
|
|
|
|
operator T() { return mValue; }
|
|
|
|
private:
|
|
T mValue;
|
|
size_t mMaxIncrement;
|
|
};
|
|
|
|
void
|
|
FdPrintf(intptr_t aFd, const char* aFormat, ...)
|
|
{
|
|
if (aFd == 0) {
|
|
return;
|
|
}
|
|
char buf[256];
|
|
CheckedIncrement<char*> b(buf, sizeof(buf));
|
|
CheckedIncrement<const char*> f(aFormat, strlen(aFormat) + 1);
|
|
va_list ap;
|
|
va_start(ap, aFormat);
|
|
while (true) {
|
|
switch (*f) {
|
|
case '\0':
|
|
goto out;
|
|
|
|
case '%':
|
|
switch (*++f) {
|
|
case 'z': {
|
|
if (*(++f) == 'u') {
|
|
size_t i = va_arg(ap, size_t);
|
|
size_t x = 1;
|
|
// Compute the number of digits.
|
|
while (x <= i / 10) {
|
|
x *= 10;
|
|
}
|
|
// Write the digits into the buffer.
|
|
do {
|
|
*(b++) = "0123456789"[(i / x) % 10];
|
|
x /= 10;
|
|
} while (x > 0);
|
|
} else {
|
|
// Write out the format specifier if it's unknown.
|
|
*(b++) = '%';
|
|
*(b++) = 'z';
|
|
*(b++) = *f;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 'p': {
|
|
intptr_t ptr = va_arg(ap, intptr_t);
|
|
*(b++) = '0';
|
|
*(b++) = 'x';
|
|
int x = sizeof(intptr_t) * 8;
|
|
bool wrote_msb = false;
|
|
do {
|
|
x -= 4;
|
|
size_t hex_digit = ptr >> x & 0xf;
|
|
if (hex_digit || wrote_msb) {
|
|
*(b++) = "0123456789abcdef"[hex_digit];
|
|
wrote_msb = true;
|
|
}
|
|
} while (x > 0);
|
|
if (!wrote_msb) {
|
|
*(b++) = '0';
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
// Write out the format specifier if it's unknown.
|
|
*(b++) = '%';
|
|
*(b++) = *f;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
*(b++) = *f;
|
|
break;
|
|
}
|
|
f++;
|
|
}
|
|
out:
|
|
#ifdef _WIN32
|
|
// See comment in FdPrintf.h as to why WriteFile is used.
|
|
DWORD written;
|
|
WriteFile(reinterpret_cast<HANDLE>(aFd), buf, b - buf, &written, nullptr);
|
|
#else
|
|
MOZ_UNUSED(write(aFd, buf, b - buf));
|
|
#endif
|
|
va_end(ap);
|
|
}
|