diff --git a/platform-darwin/Source/MasterPassword-Prefix.pch b/platform-darwin/Source/MasterPassword-Prefix.pch
index 742bd70d..f20ec33e 100644
--- a/platform-darwin/Source/MasterPassword-Prefix.pch
+++ b/platform-darwin/Source/MasterPassword-Prefix.pch
@@ -16,63 +16,60 @@
 // LICENSE file.  Alternatively, see <http://www.gnu.org/licenses/>.
 //==============================================================================
 
-#import <Availability.h>
-#import "Pearl-Prefix.pch"
+#define MP_LIBS_BEGIN \
+_Pragma("clang diagnostic push") \
+_Pragma("clang diagnostic ignored \"-Weverything\"")
+#define MP_LIBS_END \
+_Pragma("clang diagnostic pop")
+
+MP_LIBS_BEGIN
+#include <Availability.h>
+#include <os/log.h>
+#include <libgen.h>
+MP_LIBS_END
+
+#define mpw_log_os(level, file, line, function, format, ...) \
+    do { \
+        if (mpw_verbosity < level) { \
+            break; \
+        } \
+        \
+        switch (level) { \
+            case LogLevelTrace: \
+                os_log_debug( OS_LOG_DEFAULT, "%30s:%-3ld TRC | " format, basename( (char *)file ), line, ##__VA_ARGS__ ); \
+                break; \
+            case LogLevelDebug: \
+                os_log_debug( OS_LOG_DEFAULT, "%30s:%-3ld DBG | " format, basename( (char *)file ), line, ##__VA_ARGS__ ); \
+                break; \
+            case LogLevelInfo: \
+                os_log_info( OS_LOG_DEFAULT, "%30s:%-3ld INF | " format, basename( (char *)file ), line, ##__VA_ARGS__ ); \
+                break; \
+            case LogLevelWarning: \
+                os_log( OS_LOG_DEFAULT, "%30s:%-3ld WRN | " format, basename( (char *)file ), line, ##__VA_ARGS__ ); \
+                break; \
+            case LogLevelError: \
+                os_log_error( OS_LOG_DEFAULT, "%30s:%-3ld ERR | " format, basename( (char *)file ), line, ##__VA_ARGS__ ); \
+                break; \
+            case LogLevelFatal: \
+                os_log_fault( OS_LOG_DEFAULT, "%30s:%-3ld FTL | " format, basename( (char *)file ), line, ##__VA_ARGS__ ); \
+                break; \
+        } \
+        \
+        mpw_log_sink( level, file, line, function, format, ##__VA_ARGS__ ); \
+    } while (0)
+
+#define MPW_LOG mpw_log_os
+
+#include "mpw-util.h"
 
 #ifdef __OBJC__
 
+#import "Pearl-Prefix.pch"
+
 #if TARGET_OS_IOS
 #import <UIKit/UIKit.h>
 #elif TARGET_OS_OSX
 #import <Cocoa/Cocoa.h>
 #endif
 
-#import <CoreData/CoreData.h>
-#ifdef CRASHLYTICS
-#import <Crashlytics/Crashlytics.h>
-#endif
-
-#if TARGET_OS_IOS
-#import "MPTypes.h"
-#import "MPiOSConfig.h"
-#elif TARGET_OS_OSX
-#import "MPTypes.h"
-#import "MPMacConfig.h"
-#endif
-
-#else
-
-#import <libgen.h>
-#import <CoreFoundation/CFString.h>
-#import <objc/runtime.h>
-#import <objc/message.h>
-#import <objc/NSObjCRuntime.h>
-#import <stdlib.h>
-
-#define mpw_log(level, format, ...) \
-    do { \
-        char *_msg = NULL; \
-        asprintf( &_msg, format, ##__VA_ARGS__ ); \
-        if (_msg) { \
-            CFStringRef fileStr = CFStringCreateWithCString( NULL, basename( (char *)__FILE__ ), kCFStringEncodingUTF8 ); \
-            CFStringRef funcStr = CFStringCreateWithCString( NULL, __FUNCTION__, kCFStringEncodingUTF8 ); \
-            CFStringRef msgStr = CFStringCreateWithCString( NULL, _msg, kCFStringEncodingUTF8 ); \
-            id (*_getLogger)(id, SEL) = (void *)objc_msgSend; \
-            void (*_sendMsg)(id, SEL, CFStringRef, NSInteger, CFStringRef, NSUInteger, CFStringRef) = (void *)objc_msgSend; \
-            _sendMsg( _getLogger( (id)objc_getClass( "PearlLogger" ), sel_getUid( "get" ) ), \
-                    sel_getUid( "inFile:atLine:fromFunction:withLevel:text:" ), fileStr, __LINE__, funcStr, level, msgStr ); \
-            if (fileStr) { CFRelease( fileStr ); } \
-            if (funcStr) { CFRelease( funcStr ); } \
-            if (msgStr) { CFRelease( msgStr ); } \
-            free(_msg); \
-        } \
-    } while (0)
-
-#define trc(format, ...) mpw_log( 0, format, ##__VA_ARGS__ );
-#define dbg(format, ...) mpw_log( 1, format, ##__VA_ARGS__ );
-#define inf(format, ...) mpw_log( 2, format, ##__VA_ARGS__ );
-#define wrn(format, ...) mpw_log( 3, format, ##__VA_ARGS__ );
-#define err(format, ...) mpw_log( 4, format, ##__VA_ARGS__ );
-#define ftl(format, ...) mpw_log( 5, format, ##__VA_ARGS__ );
-
 #endif
diff --git a/platform-independent/c/core/src/mpw-util.c b/platform-independent/c/core/src/mpw-util.c
index e63558e6..5e195434 100644
--- a/platform-independent/c/core/src/mpw-util.c
+++ b/platform-independent/c/core/src/mpw-util.c
@@ -22,6 +22,7 @@ MP_LIBS_BEGIN
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
+#include <libgen.h>
 
 #if MPW_CPERCIVA
 #include <scrypt/crypto_scrypt.h>
@@ -34,54 +35,113 @@ MP_LIBS_BEGIN
 #include "aes.h"
 MP_LIBS_END
 
-int mpw_verbosity = LogLevelInfo;
-FILE *mpw_log_cli_file;
+LogLevel mpw_verbosity = LogLevelInfo;
+FILE *mpw_log_sink_file_target = NULL;
 
-void mpw_log_cli(LogLevel level, const char *format, ...) {
-    va_list args;
-    va_start( args, format );
-    mpw_vlog_cli( level, format, args );
-    va_end( args );
-}
-void mpw_vlog_cli(LogLevel level, const char *format, va_list args) {
-    if (!mpw_log_cli_file)
-        mpw_log_cli_file = stderr;
+static MPLogSink **sinks;
+static size_t sinks_count;
 
-    if (mpw_verbosity >= level) {
-        if (mpw_verbosity >= LogLevelDebug) {
-            switch (level) {
-                case LogLevelTrace:
-                    fprintf( mpw_log_cli_file, "[TRC] " );
-                    break;
-                case LogLevelDebug:
-                    fprintf( mpw_log_cli_file, "[DBG] " );
-                    break;
-                case LogLevelInfo:
-                    fprintf( mpw_log_cli_file, "[INF] " );
-                    break;
-                case LogLevelWarning:
-                    fprintf( mpw_log_cli_file, "[WRN] " );
-                    break;
-                case LogLevelError:
-                    fprintf( mpw_log_cli_file, "[ERR] " );
-                    break;
-                case LogLevelFatal:
-                    fprintf( mpw_log_cli_file, "[FTL] " );
-                    break;
-                default:
-                    fprintf( mpw_log_cli_file, "[???] " );
-                    break;
-            }
-        }
+bool mpw_log_sink_register(MPLogSink *sink) {
 
-        vfprintf( mpw_log_cli_file, format, args );
-        fprintf( mpw_log_cli_file, "\n" );
+    if (!mpw_realloc( &sinks, NULL, sizeof( MPLogSink * ) * ++sinks_count )) {
+        --sinks_count;
+        return false;
     }
 
-    if (level <= LogLevelFatal)
+    sinks[sinks_count - 1] = sink;
+    return true;
+}
+
+bool mpw_log_sink_unregister(MPLogSink *sink) {
+
+    for (unsigned int r = 0; r < sinks_count; ++r) {
+        if (sinks[r] == sink) {
+            sinks[r] = NULL;
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void mpw_log_sink(LogLevel level, const char *file, int line, const char *function, const char *format, ...) {
+
+    if (mpw_verbosity < level)
+        return;
+
+    va_list args;
+    va_start( args, format );
+    mpw_log_vsink( level, file, line, function, format, args );
+    va_end( args );
+}
+
+void mpw_log_vsink(LogLevel level, const char *file, int line, const char *function, const char *format, va_list args) {
+
+    if (mpw_verbosity < level)
+        return;
+
+    return mpw_log_ssink( level, file, line, function, mpw_vstr( format, args ) );
+}
+
+void mpw_log_ssink(LogLevel level, const char *file, int line, const char *function, const char *message) {
+
+    if (mpw_verbosity < level)
+        return;
+
+    MPLogEvent record = (MPLogEvent){
+            .occurrence = time( NULL ),
+            .level = level,
+            .file = file,
+            .line = line,
+            .function = function,
+            .message = message,
+    };
+
+    for (unsigned int s = 0; s < sinks_count; ++s) {
+        MPLogSink *sink = sinks[s];
+
+        if (sink)
+            sink( &record );
+    }
+
+    if (record.level <= LogLevelFatal)
         abort();
 }
 
+void mpw_log_sink_file(const MPLogEvent *record) {
+
+    if (!mpw_log_sink_file_target)
+        mpw_log_sink_file_target = stderr;
+
+    if (mpw_verbosity >= LogLevelDebug) {
+        switch (record->level) {
+            case LogLevelTrace:
+                fprintf( mpw_log_sink_file_target, "[TRC] " );
+                break;
+            case LogLevelDebug:
+                fprintf( mpw_log_sink_file_target, "[DBG] " );
+                break;
+            case LogLevelInfo:
+                fprintf( mpw_log_sink_file_target, "[INF] " );
+                break;
+            case LogLevelWarning:
+                fprintf( mpw_log_sink_file_target, "[WRN] " );
+                break;
+            case LogLevelError:
+                fprintf( mpw_log_sink_file_target, "[ERR] " );
+                break;
+            case LogLevelFatal:
+                fprintf( mpw_log_sink_file_target, "[FTL] " );
+                break;
+            default:
+                fprintf( mpw_log_sink_file_target, "[???] " );
+                break;
+        }
+    }
+
+    fprintf( mpw_log_sink_file_target, "%s\n", record->message );
+}
+
 void mpw_uint16(const uint16_t number, uint8_t buf[2]) {
 
     buf[0] = (uint8_t)((number >> 8L) & UINT8_MAX);
@@ -581,7 +641,7 @@ int mpw_strncasecmp(const char *s1, const char *s2, size_t max) {
 
     int cmp = 0;
     for (; !cmp && max-- > 0 && s1 && s2; ++s1, ++s2)
-        cmp = tolower( *(unsigned char *)s1 ) - tolower( *(unsigned char *)s2 );
+        cmp = tolower( (unsigned char)*s1 ) - tolower( (unsigned char)*s2 );
 
     return cmp;
 }
diff --git a/platform-independent/c/core/src/mpw-util.h b/platform-independent/c/core/src/mpw-util.h
index 3735c4c6..978d2a51 100644
--- a/platform-independent/c/core/src/mpw-util.h
+++ b/platform-independent/c/core/src/mpw-util.h
@@ -27,42 +27,57 @@ MP_LIBS_BEGIN
 MP_LIBS_END
 
 //// Logging.
-typedef mpw_enum(int, LogLevel) {
+typedef mpw_enum( int, LogLevel ) {
     /** Logging internal state. */
-    LogLevelTrace = 3,
+            LogLevelTrace = 3,
     /** Logging state and events interesting when investigating issues. */
-    LogLevelDebug = 2,
+            LogLevelDebug = 2,
     /** User messages. */
-    LogLevelInfo = 1,
+            LogLevelInfo = 1,
     /** Recoverable issues and user suggestions. */
-    LogLevelWarning = 0,
+            LogLevelWarning = 0,
     /** Unrecoverable issues. */
-    LogLevelError = -1,
+            LogLevelError = -1,
     /** Issues that lead to abortion. */
-    LogLevelFatal = -2,
+            LogLevelFatal = -2,
 };
 extern LogLevel mpw_verbosity;
 
-/** mpw_log_cli is a sink that writes log messages to the mpw_log_cli_file, which defaults to stderr. */
-extern FILE *mpw_log_cli_file;
-void mpw_log_cli(LogLevel level, const char *format, ...);
-void mpw_vlog_cli(LogLevel level, const char *format, va_list args);
+typedef struct {
+    time_t occurrence;
+    LogLevel level;
+    const char *file;
+    int line;
+    const char *function;
+    const char *message;
+} MPLogEvent;
 
-/** mpw_log_app is a sink placeholder that an application can implement to consume log messages. */
-void mpw_log_app(LogLevel level, const char *format, ...);
+/** A log sink describes a function that can receive log events when registered. */
+typedef void (MPLogSink)(const MPLogEvent *event);
+bool mpw_log_sink_register(MPLogSink *sink);
+bool mpw_log_sink_unregister(MPLogSink *sink);
 
-/** The sink you want to channel the log messages into, defaults to mpw_log_cli. */
+/** mpw_log_sink_file is a sink that writes log messages to the mpw_log_cli_file, which defaults to stderr. */
+extern MPLogSink mpw_log_sink_file;
+extern FILE *mpw_log_sink_file_target;
+
+/** These functions dispatch log events to the registered sinks. */
+void mpw_log_sink(LogLevel level, const char *file, int line, const char *function, const char *format, ...);
+void mpw_log_vsink(LogLevel level, const char *file, int line, const char *function, const char *format, va_list args);
+void mpw_log_ssink(LogLevel level, const char *file, int line, const char *function, const char *message);
+
+/** The log dispatcher you want to channel log messages into; defaults to mpw_log_sink, enabling the log sink mechanism. */
 #ifndef MPW_LOG
-#define MPW_LOG mpw_log_cli
+#define MPW_LOG mpw_log_sink
 #endif
 
 #ifndef trc
-#define trc(format, ...) MPW_LOG( LogLevelTrace, format, ##__VA_ARGS__ )
-#define dbg(format, ...) MPW_LOG( LogLevelDebug, format, ##__VA_ARGS__ )
-#define inf(format, ...) MPW_LOG( LogLevelInfo, format, ##__VA_ARGS__ )
-#define wrn(format, ...) MPW_LOG( LogLevelWarning, format, ##__VA_ARGS__ )
-#define err(format, ...) MPW_LOG( LogLevelError, format, ##__VA_ARGS__ )
-#define ftl(format, ...) MPW_LOG( LogLevelFatal, format, ##__VA_ARGS__ )
+#define trc(format, ...) MPW_LOG( LogLevelTrace, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__ )
+#define dbg(format, ...) MPW_LOG( LogLevelDebug, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__ )
+#define inf(format, ...) MPW_LOG( LogLevelInfo, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__ )
+#define wrn(format, ...) MPW_LOG( LogLevelWarning, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__ )
+#define err(format, ...) MPW_LOG( LogLevelError, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__ )
+#define ftl(format, ...) MPW_LOG( LogLevelFatal, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__ )
 #endif
 
 #ifndef min