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/* vim: se cin sw=2 ts=2 et : */
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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/. */
#ifndef WIDGET_GTK_GFXINFO_UTILS_h__
#define WIDGET_GTK_GFXINFO_UTILS_h__
// An alternative to mozilla::Unused for use in (a) C code and (b) code where
// linking with unused.o is difficult.
#define MOZ_UNUSED(expr) \
do { \
if (expr) { \
(void)0; \
} \
} while (0)
#define LOG_PIPE 2
static bool enable_logging = false;
static void log(const char* format, ...) {
if (!enable_logging) {
return;
}
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
}
static int output_pipe = 1;
static void close_logging() {
// we want to redirect to /dev/null stdout, stderr, and while we're at it,
// any PR logging file descriptors. To that effect, we redirect all positive
// file descriptors up to what open() returns here. In particular, 1 is stdout
// and 2 is stderr.
int fd = open("/dev/null", O_WRONLY);
for (int i = 1; i < fd; i++) {
if (output_pipe != i) {
dup2(fd, i);
}
}
close(fd);
}
// C++ standard collides with C standard in that it doesn't allow casting void*
// to function pointer types. So the work-around is to convert first to size_t.
// http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
template <typename func_ptr_type>
static func_ptr_type cast(void* ptr) {
return reinterpret_cast<func_ptr_type>(reinterpret_cast<size_t>(ptr));
}
#define BUFFER_SIZE_STEP 4000
static char* test_buf = nullptr;
static int test_bufsize = 0;
static int test_length = 0;
static void record_value(const char* format, ...) {
if (!test_buf || test_length + BUFFER_SIZE_STEP / 2 > test_bufsize) {
test_bufsize += BUFFER_SIZE_STEP;
test_buf = (char*)realloc(test_buf, test_bufsize);
}
int remaining = test_bufsize - test_length;
// Append the new values to the buffer, not to exceed the remaining space.
va_list args;
va_start(args, format);
int max_added = vsnprintf(test_buf + test_length, remaining, format, args);
va_end(args);
if (max_added >= remaining) {
test_length += remaining;
} else {
test_length += max_added;
}
}
static void record_error(const char* str) { record_value("ERROR\n%s\n", str); }
static void record_warning(const char* str) {
record_value("WARNING\n%s\n", str);
}
static void record_flush() {
if (!test_buf) {
return;
}
MOZ_UNUSED(write(output_pipe, test_buf, test_length));
if (enable_logging) {
MOZ_UNUSED(write(LOG_PIPE, test_buf, test_length));
}
free(test_buf);
test_buf = nullptr;
}
#endif /* WIDGET_GTK_GFXINFO_h__ */
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