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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /memory/replace/logalloc/FdPrintf.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'memory/replace/logalloc/FdPrintf.cpp')
-rw-r--r--memory/replace/logalloc/FdPrintf.cpp132
1 files changed, 132 insertions, 0 deletions
diff --git a/memory/replace/logalloc/FdPrintf.cpp b/memory/replace/logalloc/FdPrintf.cpp
new file mode 100644
index 000000000..c34dddcaa
--- /dev/null
+++ b/memory/replace/logalloc/FdPrintf.cpp
@@ -0,0 +1,132 @@
+/* -*- 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);
+}