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//===--- BacktraceUtils.cpp - Private backtracing utilities -----*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Defines some async-signal-safe formatting functions.
//
//===----------------------------------------------------------------------===//
#include "BacktracePrivate.h"
namespace swift {
namespace runtime {
namespace backtracing {
// We can't call sprintf() here because we're in a signal handler,
// so we need to be async-signal-safe.
SWIFT_RUNTIME_STDLIB_INTERNAL void
_swift_formatAddress(uintptr_t addr, char buffer[18])
{
char *ptr = buffer + 18;
*--ptr = '\0';
while (ptr > buffer) {
char digit = '0' + (addr & 0xf);
if (digit > '9')
digit += 'a' - '0' - 10;
*--ptr = digit;
addr >>= 4;
if (!addr)
break;
}
// Left-justify in the buffer
if (ptr > buffer) {
char *pt2 = buffer;
while (*ptr)
*pt2++ = *ptr++;
*pt2++ = '\0';
}
}
// See above; we can't use sprintf() here.
SWIFT_RUNTIME_STDLIB_INTERNAL void
_swift_formatUnsigned(unsigned u, char buffer[22])
{
char *ptr = buffer + 22;
*--ptr = '\0';
while (ptr > buffer) {
char digit = '0' + (u % 10);
*--ptr = digit;
u /= 10;
if (!u)
break;
}
// Left-justify in the buffer
if (ptr > buffer) {
char *pt2 = buffer;
while (*ptr)
*pt2++ = *ptr++;
*pt2++ = '\0';
}
}
} // namespace backtracing
} // namespace runtime
} // namespace swift
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