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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* Version: MPL 1.1 / GPLv3+ / LGPLv3+
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License or as specified alternatively below. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Major Contributor(s):
* Copyright (C) 2011 Red Hat, Inc., Stephan Bergmann <sbergman@redhat.com>
* (initial developer)
*
* All Rights Reserved.
*
* For minor contributions see the git repository.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 3 or later (the "GPLv3+"), or
* the GNU Lesser General Public License Version 3 or later (the "LGPLv3+"),
* in which case the provisions of the GPLv3+ or the LGPLv3+ are applicable
* instead of those above.
*/
#include "sal/config.h"
#include <cassert>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <stdio.h> // vsnprintf
#include <string.h> // strdup
#include "osl/thread.hxx"
#include "rtl/string.h"
#include "sal/detail/log.h"
#include "sal/log.hxx"
#include "sal/types.h"
#include "logformat.hxx"
#if defined WNT
#include <process.h>
#define OSL_DETAIL_GETPID _getpid()
#else
#include <unistd.h>
#define OSL_DETAIL_GETPID getpid()
#endif
// Avoid the use of other sal code in this file as much as possible, so that
// this code can be called from other sal code without causing endless
// recursion.
namespace {
bool equalStrings(
char const * string1, std::size_t length1, char const * string2,
std::size_t length2)
{
return length1 == length2 && std::memcmp(string1, string2, length1) == 0;
}
char const * toString(sal_detail_LogLevel level) {
switch (level) {
default:
assert(false); // this cannot happen
// fall through
case SAL_DETAIL_LOG_LEVEL_INFO:
return "info";
case SAL_DETAIL_LOG_LEVEL_WARN:
return "warn";
case SAL_DETAIL_LOG_LEVEL_DEBUG:
return "debug";
}
}
// getenv is not thread safe, so minimize use of result:
char const * getEnvironmentVariable() {
char const * p1 = std::getenv("SAL_LOG");
if (p1 == 0) {
return "+WARN";
}
char const * p2 = strdup(p1); // leaked
if (p2 == 0) {
std::abort(); // cannot do much here
}
return p2;
}
bool report(sal_detail_LogLevel level, char const * area) {
if (level == SAL_DETAIL_LOG_LEVEL_DEBUG)
return true;
assert(area != 0);
static char const * env = getEnvironmentVariable();
std::size_t areaLen = std::strlen(area);
enum Sense { POSITIVE = 0, NEGATIVE = 1 };
std::size_t senseLen[2] = { 0, 1 };
// initial senseLen[POSITIVE] < senseLen[NEGATIVE], so that if there are
// no matching switches at all, the result will be negative (and
// initializing with 1 is safe as the length of a valid switch, even
// without the "+"/"-" prefix, will always be > 1)
for (char const * p = env;;) {
Sense sense;
switch (*p++) {
case '\0':
return senseLen[POSITIVE] >= senseLen[NEGATIVE];
// if a specific item is both postiive and negative
// (senseLen[POSITIVE] == senseLen[NEGATIVE]), default to
// positive
case '+':
sense = POSITIVE;
break;
case '-':
sense = NEGATIVE;
break;
default:
return true; // upon an illegal SAL_LOG value, enable everything
}
char const * p1 = p;
while (*p1 != '.' && *p1 != '+' && *p1 != '-' && *p1 != '\0') {
++p1;
}
bool match;
if (equalStrings(p, p1 - p, RTL_CONSTASCII_STRINGPARAM("INFO"))) {
match = level == SAL_DETAIL_LOG_LEVEL_INFO;
} else if (equalStrings(p, p1 - p, RTL_CONSTASCII_STRINGPARAM("WARN")))
{
match = level == SAL_DETAIL_LOG_LEVEL_WARN;
} else {
return true;
// upon an illegal SAL_LOG value, everything is considered
// positive
}
char const * p2 = p1;
while (*p2 != '+' && *p2 != '-' && *p2 != '\0') {
++p2;
}
if (match) {
if (*p1 == '.') {
++p1;
std::size_t n = p2 - p1;
if ((n == areaLen && equalStrings(p1, n, area, areaLen))
|| (n < areaLen && area[n] == '.'
&& equalStrings(p1, n, area, n)))
{
senseLen[sense] = p2 - p;
}
} else {
senseLen[sense] = p1 - p;
}
}
p = p2;
}
}
void log(
sal_detail_LogLevel level, char const * area, char const * where,
char const * message)
{
std::ostringstream s;
if (level == SAL_DETAIL_LOG_LEVEL_DEBUG) {
s << toString(level) << ':' << /*no where*/' ' << message << '\n';
} else {
s << toString(level) << ':' << area << ':' << OSL_DETAIL_GETPID << ':'
<< osl::Thread::getCurrentIdentifier() << ':' << where << message
<< '\n';
}
std::fputs(s.str().c_str(), stderr);
}
}
void sal_detail_log(
sal_detail_LogLevel level, char const * area, char const * where,
char const * message)
{
if (report(level, area)) {
log(level, area, where, message);
}
}
void sal_detail_logFormat(
sal_detail_LogLevel level, char const * area, char const * where,
char const * format, ...)
{
if (report(level, area)) {
std::va_list args;
va_start(args, format);
osl::detail::logFormat(level, area, where, format, args);
va_end(args);
}
}
void osl::detail::logFormat(
sal_detail_LogLevel level, char const * area, char const * where,
char const * format, std::va_list arguments)
{
char buf[1024];
int const len = sizeof buf - RTL_CONSTASCII_LENGTH("...");
int n = vsnprintf(buf, len, format, arguments);
if (n < 0) {
std::strcpy(buf, "???");
} else if (n >= len) {
std::strcpy(buf + len - 1, "...");
}
log(level, area, where, buf);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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