4 files changed, 264 insertions, 0 deletions

diff --git a/src/fstring.h b/src/fstring.h
index 9d88bd4..fe34804 100644
--- a/src/fstring.h
+++ b/src/fstring.h
@@ -128,6 +128,7 @@ namespace Bu
                  */
                 void append( const chr *pData )
                 {
+                        if( !pData ) return;
                         long nLen;
                         for( nLen = 0; pData[nLen] != (chr)0; nLen++ );
                         if( nLen == 0 )
diff --git a/src/logger.cpp b/src/logger.cpp
new file mode 100644
index 0000000..848dfb1
--- /dev/null
+++ b/src/logger.cpp
@@ -0,0 +1,123 @@
+#include "bu/logger.h"
+#include <stdarg.h>
+#include <time.h>
+#include <stdio.h>
+
+Bu::Logger::Logger()
+{
+}
+
+Bu::Logger::~Logger()
+{
+}
+
+void Bu::Logger::log( int nLevel, const char *sFile, const char *sFunction, int nLine, const char *sFormat, ...)
+{
+        if( (nLevel&nLevelMask) == 0 )
+                return;
+
+        va_list ap;
+        va_start( ap, sFormat );
+        char *text;
+        vasprintf( &text, sFormat, ap );
+        va_end(ap);
+        
+        time_t t = time(NULL);
+        
+        char *line = NULL;
+        struct tm *pTime;
+        pTime = localtime( &t );
+        asprintf(
+                &line,
+                sLogFormat.getStr(),
+                pTime->tm_year+1900,
+                pTime->tm_mon+1,
+                pTime->tm_mday,
+                pTime->tm_hour,
+                pTime->tm_min,
+                pTime->tm_sec,
+                nLevel,
+                sFile,
+                nLine,
+                text,
+                sFunction
+                );
+        write( fileno(stdout), line, strlen(line) );
+        free( text );
+        free( line );
+}
+
+void Bu::Logger::setFormat( const Bu::FString &str )
+{
+        sLogFormat = "";
+
+        static char fmts[][4]={
+                {'y', 'd', '0', '1'},
+                {'m', 'd', '0', '2'},
+                {'d', 'd', '0', '3'},
+                {'h', 'd', '0', '4'},
+                {'M', 'd', '0', '5'},
+                {'s', 'd', '0', '6'},
+                {'L', 'd', '0', '7'},
+                {'f', 's', '0', '8'},
+                {'l', 'd', '0', '9'},
+                {'t', 's', '1', '0'},
+                {'F', 's', '1', '1'},
+                {'\0', '\0', '\0', '\0'},
+        };
+        
+        for( const char *s = str.getStr(); *s; s++ )
+        {
+                if( *s == '%' )
+                {
+                        sLogFormat += '%';
+                        s++;
+                        for( int l = 0;; l++ )
+                        {
+                                if( fmts[l][0] == '\0' )
+                                {
+                                        sLogFormat += *s;
+                                        break;
+                                }
+                                else if( *s == fmts[l][0] )
+                                {
+                                        sLogFormat += fmts[l][2];
+                                        sLogFormat += fmts[l][3];
+                                        sLogFormat += '$';
+                                        sLogFormat += fmts[l][1];
+                                        break;
+                                }
+                        }
+                }
+                else
+                {
+                        sLogFormat += *s;
+                }
+        }
+        sLogFormat += '\n';
+
+        write( fileno(stdout), sLogFormat.getStr(), sLogFormat.getSize() );
+}
+
+void Bu::Logger::setMask( int n )
+{
+        nLevelMask = n;
+}
+
+void Bu::Logger::setLevel( int n )
+{
+        int j;
+        for( j = 31; j > 0; j-- )
+        {
+                if( (n&(1<<j)) )
+                {
+                        for(; j >= 0; j-- )
+                        {
+                                n |= (1<<j);
+                        }
+                        nLevelMask = n;
+                        return;
+                }
+        }
+}
+
diff --git a/src/logger.h b/src/logger.h
new file mode 100644
index 0000000..f8e1692
--- /dev/null
+++ b/src/logger.h
@@ -0,0 +1,112 @@
+#ifndef BU_LOGGER_H
+#define BU_LOGGER_H
+
+#include "bu/singleton.h"
+#include "bu/fstring.h"
+
+namespace Bu
+{
+        /**
+         * Simple logging facility.  All output goes straight to stdout, unlike the
+         * old multi-log system.  Generally we expect any program complex enough to
+         * want to use this will have other facilities for processing the logging
+         * output, but if we need it we can add other output methods.
+         *
+         * Currently implemented as a singleton to avoid clutter with globals, you
+         * generally never want to use the logging system directly, it's annoying.
+         * Instead use the handy macros lineLog, setLogMask, setLogFormat, and
+         * setLogLevel.  They do all the real work for you.
+         *
+         * In the log format, you can specify extra information that will be written
+         * to the log with every message, and extras in printf style.  Use %X flags
+         * where X is one of the following:
+         * - L - Logging level of the log message (not the current mask)
+         * - y - Full year
+         * - m - Month
+         * - d - Day of month
+         * - h - Hour (24-hour format)
+         * - M - Minutes
+         * - s - Seconds 
+         * - f - Source file
+         * - l - Line number
+         * - F - function name
+         * - t - Text of message (usually important)
+         *
+         * You can include anything extra that you would like, a newline will always
+         * be added automatically, so no need to worry about that.  You can also
+         * include any extra printf style formatting that you would like, for
+         * example: "%h:%02M:%02s" for the time 4:02:09 instead of 4:2:9.
+         *
+         * It's generally handy to create an enum of values you use as levels during
+         * program execution (such as error, warning, info, debug, etc).  These
+         * levels should be treated as bitflags, and the most desirable messages,
+         * i.e. serious errors and the like should be low order (0x01), and the much
+         * less desirable messages, like debugging info, should be higher order
+         * (0xF0).  During operation you can then set either an explicit mask,
+         * selecting just the levels that you would like to see printed, or set the
+         * mask using the setLevel helper function, which simulates verbosity
+         * levels, enabling every flag lower order than the highest order set bit
+         * passed.  I.E. if you had the following enumerated levels:
+         * 
+         *@code
+         enum {
+                logError        = 0x01,
+                logWarning      = 0x02,
+                logInfo         = 0x04,
+                logDebug        = 0x08
+         };
+         @endcode
+         * And you set the mask with setMask( logInfo ) the only messages you would
+         * see are the ones catagorized logInfo.  However, if you used 
+         * setLevel( logInfo ) then you would see logInfo, logWarning, and logError
+         * type messages, since they are lower order.
+         */
+        class Logger : public Bu::Singleton<Bu::Logger>
+        {
+                friend class Bu::Singleton<Bu::Logger>;
+        private:
+                Logger();
+                virtual ~Logger();
+
+        public:
+                void log( int nLevel, const char *sFile, const char *sFunction, int nLine, const char *sFormat, ...);
+
+                void setFormat( const Bu::FString &str );
+                void setMask( int n );
+                void setLevel( int n );
+
+        private:
+                Bu::FString sLogFormat;
+                int nLevelMask;
+        };
+}
+
+/**
+ * Use Bu::Logger to log a message at the given level and with the given message
+ * using printf style formatting, and include extra data such as the current
+ * file, line number, and function.
+ */
+#define lineLog( nLevel, sFrmt, ...) \
+        Bu::Logger::getInstance().log( nLevel, __FILE__, __PRETTY_FUNCTION__, __LINE__, sFrmt, ##__VA_ARGS__ ) 
+
+/**
+ * Set the Bu::Logger logging mask directly.  See Bu::Logger::setMask for
+ * details.
+ */
+#define setLogMask( nLevel ) \
+        Bu::Logger::getInstance().setMask( nLevel ) 
+
+/**
+ * Set the Bu::Logger format. See Bu::Logger::setFormat for details.
+ */
+#define setLogFormat( sFrmt ) \
+        Bu::Logger::getInstance().setFormat( sFrmt ) 
+
+/**
+ * Set the Bu::Logger logging mask simulating levels.  See Bu::Logger::setLevel
+ * for details.
+ */
+#define setLogLevel( nLevel ) \
+        Bu::Logger::getInstance().setLevel( nLevel ) 
+
+#endif
diff --git a/src/tests/logger.cpp b/src/tests/logger.cpp
new file mode 100644
index 0000000..a271443
--- /dev/null
+++ b/src/tests/logger.cpp
@@ -0,0 +1,28 @@
+#include "bu/logger.h"
+#include <errno.h>
+#include <stdlib.h>
+
+class Thing
+{
+        public:
+                Thing()
+                {
+                        lineLog( 2, "Want a thing?");
+                }
+
+                void go( int i )
+                {
+                        lineLog( 1, "GO!!!!");
+                }
+};
+
+int main()
+{
+        setLogLevel( 4 );
+        setLogFormat("%L: %y-%m-%d %h:%M:%s %f:%l:%F: %t");
+        lineLog( 5, "Hey, error: %s", strerror( errno ) );
+
+        Thing gh;
+        gh.go( 6);
+}
+